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PART 3

Phn 3: Thuyt minh k thut h thng cp thot nc

CHNG 03: NG V PH KIN

CHAPTER 03: PIPEWORK AND FITTINGS41.Tng qut:

4General

41.1.M t:

4Description

41.2.Nh sn xut

4Manufacture

41.3.S la chn

4Selection

51.4.Tiu chun

5Standards

71.5.Vt liu

7Materials

71.6.Mi ni

7Joints and jointing

71.7.Ph kin

7Fittings

81.8.Gi

8Supports

91.9.Cht neo

9Anchors

91.10.Thanh dn

9Guides

91.11.B ni mm v ni co gin

9Flexible couplings and expansion joints

101.12.S thng hi

10Air vents

111.13.im x

11Drain points

111.14.B lc ng ng

11Pipeline strainers

111.15.Van

11Valves

131.16.Van phao hot ng kiu Pilot

13Pilot operated float valves

131.17.Cng tc p sut

13Pressure switches

141.18.Cng tc dng chy

14Flow switches

141.19.B cng tc mc nc

14Level switches

151.20.p k

15Pressure gauges

151.21.Ch th mc nc

15Level indicators

161.22.Van gim p kiu t l

16Ratio type pressure reducing valve

161.23.B iu chnh lu lng khng i

16Constant flow regulators

162.Lp t

16Installation

162.1.Khi qut

16General

172.2. dc

17Falls

172.3.Mi ni

17Joints

182.4.Cht neo

18Anchors

192.5.B ni mm v gin n

19Flexible and expansion couplings

192.6.ng lt

19Pipe sleeves

202.7.ng i chm/ngm

20Buried pipes

202.8.ng bn ngoi trn mi

20External pipes on roof

212.9.Thot nc sn

21Loor drains

212.10.Phn cui ca l thng ng thot cht thi rn / nc

21Termination of soil/waste vents

212.11.L cp gi ti

21Fresh air inlets

212.12.Nt lm v sinh

21Clean outs

222.13.V tr ng

22Pipe position

222.14.Th nghim

22Testing

222.15.Hon thin

22Finished

232.16.Nhn dng

23Identification

1. Tng qut:

General

1.1. M t

Description Phn ny m t nhng c im ca ng v ph kin cho nhng h thng khc nhau ca phn cng vic c th hin trn bn v.

This Section specifies the pipework and fittings for the various systems which shall form part of the Works as shown on the Drawings.

Ngoi tr cc iu kin c bit khc, cm t ng ng v ph kin hay ng v ph kin c dng trong phn tng qut c ngha l tt c ng ng, ph kin, van, ng h, lc, treo ng, ng v tt c cc b phn lin quan khc bo m cho vic lp t hon chnh h thng nh th hin trn bn v.

Unless specifically stated otherwise, the terms "pipework and fittings" or "pipes and fittings", when used in a general context, shall mean all pipework, fittings, valves, gauges, strainers, hangers, supports and all other components and accessories required for the complete installation of the system as shown on the Drawings. 1.2. Nh sn xut

Manufacture Tt c ng v ph kin ca cng mt vt liu phi c cung cp bi ch mt nh sn xut bo m cho vic thng nht v tiu chun v cc b phn trong cng tc lp t.

All pipework and fittings of the same material shall be supplied by a single manufacturer to ensure uniformity of standards and composition between services installations.

Tt c ng ng c vn chuyn n cng trng phi c nh du mu khi cn nh my phn bit gia cc loi ng, vt liu v nh sn xut khc nhau.

All pipework delivered to site shall be new and shall be colour banded at the factory to identify different grades, materials and manufacturers.

Tt c cc loi van cch ly v iu chnh u phi l sn phm ca cng 1 nh sn xut.

All valves for isolation and regulation shall be the product of a single manufacturer. 1.3. S la chn

Selection

Tt c ph tng, ph kin, mi ni v mt ni c dng phi bo m thch hp vi cht c vn chuyn trong ng v khng b h hng bi tc ng ca ha cht v khng kh.

All pipework fittings, accessories, joints and joining media used shall be suitable for the substance conveyed in the pipes and shall not deteriorate due to chemical or atmospheric action.

Tt c ng, ph kin v van phi thch hp cho vic kim tra p sut.

All pipework, fittings and valves must be suitable for the system test pressures. 1.4. Tiu chun

Standards Tt c ng v ph kin phi theo tiu chun ca Anh hoc mt tiu chun quc t tng ng.

All pipework and fittings shall comply with the appropriate British Standard as listed or an equivalent international standard.

Tt c cng nhn hn phi c giy chng nhn tay ngh do mt c quan c thm quyn cp. Cc giy chng nhn ny phi c trnh cho Qun l d n kim tra trc khi tin hnh bt c cng tc hn no v phi lun c gia hn mi 6 thng.

All personnel engaged on welding operations must possess a certificate of competence issued by an approved authority. These certificates must be produced for inspection by the Project Manager before any welding is undertaken and renewal certificates must be provided every six months.

Tng mi hn phi c nh du thch hp c th nhn ra nhng thng tin lin quan. l s bt buc khng c ngoi l.

Each weld shall be given a suitable mark in order that the operative concerned may be identified. This will be rigidly enforced.

Qun l d n d tr ct khan 2% mi hn xem xt kim tra. Nu c bt c mt mi hn no b li do vt liu hay tay ngh, Qun l d n c th yu cu ct thm s lng mi hn ln n 4% kim tra. Nu c trn 4% s lng mi hn ct kim tra khng t tiu chun th Qun l d n c th yu cu ct tip cc mi hn khc kim tra m khng b hn ch v s lng. Nh thu ph phi chu tt c chi ph lin quan n vic ct v sa cha cc mi hn trn.

The Project Manager reserves the right to order at random the cutting out of 2% of the welded joints for inspection and testing. Should any one of the above welds prove faulty in materials or workmanship, further removal of welds may be ordered up to a total of 4% of the welded joints. If the number of welds failing the tests within the above 4% is sufficient to suggest that an operative is not consistent in his standard, the Project Manager may order any number of that operative's welds to be removed. The cutting out and repair of all such welds for inspection shall be at the cost of the Sub-Contractor.

ng thp hn gi v hn in phi theo tiu chun typ 2 B.S. 2640, B.S. 2971 hoc B.S. 4515.

Oxyacetylene and metal arc welding of steel pipework shall be Class 2 to B.S. 2640, B.S. 2971 or B.S. 4515.

Cc mi hn ng nng chy phi theo tiu chun B.S. 1077 v hn ng thic bng gas phi theo tiu chun B.S. 1724.

Fusion welded joints in copper shall be to B.S. 1077 and bronze welding by gas shall comply in every respect with B.S. 1724.

Khng c hn gas i vi ng thp c ng knh ln hn hoc bng 65mm tr khi c cho php trc.

Gas welding of steel pipework of 65mm and above shall not be permitted unless prior permission is obtained.

Trong bt c trng hp no cng khng c hn ng trng km.

Welding shall not be permitted on galvanized pipework under any circumstances.

Khng chp nhn s dng cc loi ng, mt bch, hay ph kin lm bng st mm ti ni a.

No locally made ductile iron pipework, flanges or fittings will be accepted.

Tiu chun hn ng dn gas (API Schedule 40 pipes) phi c tun th nghim ngt v phi kt hp vi tiu chun CP51 cng nh yu cu cung cp gas ca thnh ph.

The standard for welding on gas pipes (API Schedule 40 pipes) shall adhere strictly and comply with CP51 & the requirements of City Gas.

Tt c mi ni ren phi c thc hin theo tiu chun B.S. 21 dng ni cc thnh phn c chn la cn thn ph hp vi cng vic.

All screwed joints shall be made in compliance with B.S. 21 using jointing compounds carefully selected to suit the type of service.

Tt c mi ni mt bch phi theo tiu chun B.S. 4505 v tt c ph kin van ... cng phi tng thch vi cc mt bch. Cc mt bch phi c mt p ni v cc mt bch phi ng nht vi nhau trong tng ngnh dch v. Tt c ng ng, linh kin v mt bch phi theo tiu chun PN16 ngoi tr cc trng hp c yu cu khc v p sut ca h thng.

All flanged joints shall be made in compliance with B.S. 4505 and all fittings valves etc. shall be compatible with sub flanges. Flanges shall have raised faces and a uniformity of flanges shall be employed between each service installation. All pipework, fittings and plant flanges shall be PN16 type unless otherwise stated or required by the system pressures.

Tt c ph kin ca ng dn phi ph hp vi tiu chun B.S. 864, phn 2.

All capillary fitting shall comply with B.S. 864, Part 2.

Tt c ph kin ng thot nc bng gang xm v gang mm bao gm c lp bo v bn ngai phi theo tiu chun B.S c lin quan.

All cast iron and ductile iron drainage fittings including protective coatings shall be in accordance with the relevant B.S. standard. 1.5. Vt liu

Materials

Bng 3.1 cho bit cc loi vt liu dng cho tng loi ng khc nhau ng vi cc cng vic khc nhau.

Table 3.1 lists the material classes for the various piped services forming part of the Works.

Bng 3.2 l thng s vt liu ng vi tng loi ng khc nhau.

Table 3.2 lists the materials specifications for the various classes of pipework. 1.6. Mi ni

Joints and jointing Cc mi ni thch hp s c cung cp cho cc phng my bo m rng c th bo tr, tho ri hay thay th cc thit b m khng cn phi tho d nhiu ng hay cc my mc ln cn.

Sufficient joints shall be provided in all plant rooms to ensure that access to equipment for maintenance, removal and replacement can be effected without dismantling large sections of pipework or adjacent plant.

ch tip gip gia ng v thit b c dng cc mt bch lm bng kim loi khc vi ng th phi dng cc mt bch ca cng mt nhn hiu vi cc bulong bng cht do.

Where pipework is connected to items of equipment having flanges of a dissimilar metal to the pipework, then isolating flanges of a proprietary brand shall be used with plastic bolt inserts. 1.7. Ph kin

Fittings Cc co c bn knh di s c dng nhiu hn cc co trn nhng v tr thch hp. Cc co vung hoc gp khc s khng c s dng.

Long sweep bends shall be used in preference to round elbows wherever practicable. Square elbows or lobster backed bends shall not be used.

T cong hay dng co i thng c dng ngoi tr nhng v tr i hi T vung cho ng thng hi hay thot nc.

Tees shall be of the easy sweep or twin elbow pattern except where square tees are required for venting or draining, etc.

Khng c dng cc loi ng lt, v nhng ch cn gim kich thc ng, phi dng ni gim hay T gim. Ni gim lch tm phi c dng nhng v tr cn thit thot nc hay loi tr bt kh.

Bushes shall not be used and where a reduction in pipe size is required, reducing sockets or tees shall be used. Eccentric reducing sockets shall be used wherever necessary to ensure proper drainage or elimination of air pockets. 1.8. Gi Supports

Gi ng phi t yu cu kh nng ng ng n nh v chc chn.

Pipe supports shall be provided as required for the stable and sufficient support of the pipework.

Gi ng phi cho php s co gin di chuyn t do v phi c dc theo mc yu cu loi tr bt kh v thot nc.

Pipe supports shall allow free movement for expansion and contraction and shall be graded to required levels for air elimination and drainage.

Cc ng thp th c v bc ng bng thp v ng ng th c v bc bng ng thau hoc kim loi nng sng (gun-metal). i vi ng thp, v bc ng s c nhng km nng sau khi ch to.

Ferrous pipes shall have ferrous brackets and copper pipes shall have brass or gunmetal brackets. For ferrous pipework the pipe brackets shall be hot dip galvanised after manufacture.

Cc gi b sung s c t st bn cc van v t vo u cui ng cp nc, v.v.., v gn vo cc ng ng ln ngn cng qu mc ca cc ng k tip. Gi b sung cng s c lp st bn u ni my bm, v.v ngn chn cng qu mc ln bm.

Additional supports shall be provided adjacent to mixing valves and end of water supply pipework etc., and other large pipeline mounted items to prevent undue strain on adjoining pipework. Additional supports shall also be provided adjacent to pump connections, etc., to prevent undue strain on plant.

Cc ng ngm s c neo vo sn tng trt hoc dm n nh mt thnh phn ca ta nh.

Underground pipe shall be anchored to the ground slab or beam so that it forms part of the building element.

Gi chn vt c lp vo y ca ng thot ng v on co r kh lc y.

Duct-Foot support shall be provided at bottom of pipe stack and at turning elbow to absorb the thrust force.

1.9. Cht neo

Anchors

Cc neo ng tng xng s c cung cp khi cn v s c lm bng thp xy dng nh hnh sit cht vo kt cu ca ta nh.

Adequate pipe anchors shall be provided as necessary and shall be constructed from structural steel channel sections secured to the building structure. 1.10. Thanh dn

Guides

Thanh dn c lp nh th hin trn bn v l loi thp mm c hn vo ng trn trc ln hoc cc gi trt PTFE hm bng bulong-U ln v bc hoc theo chi tit trn bn v thu

Guides shall be provided as shown on the drawing and shall be of mild steel riders welded to the pipes on roller or PTFE sliding supports restrained with Ubolts on brackets or as otherwise detailed on the Contract Drawings. 1.11. B ni mm v ni co gin

Flexible couplings and expansion joints

Bt k ch no cn phi c php co gin thay i hng ca ng hay cc vng gin n d c th hin trn bn v hay khng.

Wherever necessary, due allowance shall be made for the expansion and contraction of pipework by change in direction of pipework, or expansion loops, whether shown on the Drawings or not.

Ti cc mi ni gin n ca cao c, v bt k ni no khc, c php b sung b gin n kiu hng trc (axial) hay nhng (articulated bellows) bng i-nox vi tt c thanh dn cn thit, v.vtheo hng dn ca nh sn xut vi tui th lm vic khng t hn 20 nm.

At building expansion joints, and wherever else necessary, additional allowance shall be made by the provision of stainless steel axial or articulated bellows type expansion compensators complete with all necessary guides, etc., as recommended by the manufacturer to give a working life of not less than twenty years.

Mi b b gin n phi t nht s gi nguyn din tch ngang nh cc ng lin k i vi ton b chiu di ca n.

Each compensator shall maintain at least the same crosssectional area as adjoining pipework for its entire length.

Trn cc ng thp, ng gang mm v ng gang xm c ng knh ln (150mm hoc hn), s dng b ni c v bc (dresser) hoc cc b ni mm tng ng kt ni n tt c cc thit b my mc.

On larger diameter steel, ductile and grey iron pipes (150mm diameter and above) judicious use of "dresser" couplings or other equal flexible couplings shall be made in connection to all plant items.

B ni mm c gn vo u ht v u y my bm v v tr th hin trn bn v

Flexible couplings shall be fitted to pump suction and discharge connections and where indicated on the Drawings.

B ni mm c cng kch c, c ch to t vi nylon a si vi cc vng gia cng v cc lp lt gia c bng si kim loi c thit k thch hp vi cht cng tc v th nghim v p sut t bin (shock) s tri qua trn nhiu h thng khc nhau.

Flexible couplings shall be line size, made from a multiply nylon fabric carcass with wire reinforced collars and liners designed to suit the fluid conveyed and the test and shock pressures that will be experienced in the various systems.

Nh thu s thng bo cho cc nh sn xut bit v kh nng thay i ca thit b (v d: p sut t bin khi vn hnh tt/m my bm, vv) m bo chn la ng loi cho ng dng ring.

Manufacturers shall be alerted by the Contractor to the possibility of variations of service (e.g. on/off pump operation shock pressures, etc.) to ensure correct selection of items for the particular application.1.12. S thng hi

Air vents

Cc van x kh c kch thc thch hp s c lp cc im cao trn h cp nc d c c th hin trn bn v hay khng.

Key operated air vent cocks of an adequate size shall be provided at all high points on water supply, whether shown on the Drawings or not.

Nhng v tr cao khng th n gn, bnh kh s c cung cp vi ng thng hi i vng xung d n v tr cch sn 1200 mm, kt thc bng van x kh (vent cock)

Where such high points are unaccessible, air bottles shall be provided with the vent pipe turned over and carried down to a point 1,200mm above floor level, terminating in a vent cock.

Tu theo cch chn la m Nh thu s lp t ti nh ca cc ng ng hay cc v tr cao cc b x kh t ng.

Alternatively, the Contractor shall install at the top of all risers, as well as at high points, automatic air vents.

Mi x kh s kt hp vi van np kho v ng thi s chy n im x gn nht

Each vent shall incorporate a lockshield valve and the discharge pipe shall be run to the nearest agreed drain point.

1.13. im x

Drain points

Van x nc c kch thc thch hp s c cung cp ti im thp nht trn h thng ng x nc cho h thng d c th hin trn bn v hay khng.

Adequately size drain valves shall be provided at all low points on the piping system, whether shown on the Drawing or not, for draining of the system.1.14. B lc ng ng

Pipeline strainers

B lc nc s c lp trn tt c ng ng i vo tt c cc my mc thit b v cc v tr khc nh c th hin trn bn v.

Water strainers shall be installed in all pipelines upstream of all plant and elsewhere as indicated on the Drawings.

i vi ng ng c ng knh danh ngha t 15mm n 50mm, b lc s c v bng ng thit hay kim loi nng sng (gunmetal) kiu Y ni ren vi li lc bng i-nox.

For pipelines of nominal bores between 15mm and 50mm inclusive strainers shall be screwed gunmetal or bronze body 'Y' type with stainless steel screen.

i vi ng ng c ng danh ngha t 65mm v ln hn, b lc s c kiu ni mt bch theo tiu chun B.S 4504 vi li lc bng inox.

For pipelines of nominal bores from 65mm and above, strainers shall be flanged to B.S. 4504 with stainless steel screen.

Pha bn trong ca b lc phi c trng lp epoxy nng chy ti nh my. (tr trng hp phn thn bng ng)

Internal surface of the strainer shall be finished with fusion bonded epoxy coating at the factory. (except for gunmetal or bronze body)

B v b lc kiu bucket s c lm bng gang c khong trng ht ti thiu 3 ln ng knh ng. B lc c lp kiu mt bch theo tiu chun B.S. 4504

Tank and bucket strainers shall be in cast iron having free suction over at least 3 times of the pipe bore. Strainers shall have flanges to B.S. 4504.1.15. Van

Valves Van cho cc loi ng khc nhau c nu r trong bng sau:

Valves for the various classes of pipework shall be as indicated in the following Tables.

Bng 3.8 Van cch ly

Table 3.8 Isolating Valves

Bng 3.9 Van mt chiu

Table 3.9 Check Valves

Bng 3.10 Vi x

Table 3.10 Drain Cocks

Bng 3.11 Van phao kiu bi (ball)

Table 3.11 Ball Float Valves

Bng 3.12 Van gim p

Table 3.12 Pressure Reducing Valves

Cc bng lit k hng dn Nh thu ph trong vic chn loi van thch hp theo nhu cu ring.

The Tables listed are for the guidance of the Sub-Contractor in selecting suitable types of valves for a particular service.

Lu rng cc hng mc lit k trong bng s khng c ng l c Cc cp nc PUB (cng cng) ph duyt. Nh thu ph s c trch nhim m bo ng theo yu cu ca c quan thm quyn trong vic kim tra, ng du duyt van v phi tr cho bt k cc khon chi ph no

Note that inclusion in these Tables shall not be taken as implying approval of the valve by the PUB Water Department. The Sub-Contractor shall be entirely responsible for ensuring compliance with any Authorities requirements, for the testing, stamping of valves and for the payment of any fees levied.Ni chung, tt c cc van (65mm v nh hn l loi ng thit. Tt c cc van (80mm v ln hn l loi gang mm vi lp ph epoxy kt dnh nng chy lm ti nh my.

In general, all valves (65mm and below shall be of bronze type. All valves (80mm and above shall be of ductile iron with fusion bonded epoxy lining applied at the factory.

Nh thu s cung cp tt c cc van cn thit cho vic hon thnh ng, vn hnh, cch ly, iu chnh v kim sot cng tc lp t.

The Contractor shall include for all valves necessary for the proper completion, working, isolation, regulation and control of the installations.

Van cng s c cung cp cho ng ng nc vo ly t ng nc chnh ca PUB hin hu. Vi nc v van cng s c cung cp cho tt c thit b v sinh v thit b, my mc tng ng m bo mi hng mc c th di chuyn, thay i hoc sn li m khng cn tho ng ng.

Sluice valves shall be provided for incoming water supply pipe tapping from existing PUB main. Stop cocks and gate valves shall be provided for all sanitary fixtures and equipment, plant respectively to ensure that each item can be removed, replaced or repainted without drawing the pipework.

Van cng c cung cp cho tt c cc nhnh nm ngoi ng cp nc v ng ng cch ly tng phn v tho nc cng nh hon tt tng giai on lp t.

Gate valves shall be provided for all branch out from water supply droppers and risers for the sectional isolation and draining of the pipework as well as for phased completion of the installation.

Tt c cc van phi l loi dy ph hp i vi p sut th thu lc c ghi r v c lp t phi tht thng ng hay ngang bng.

All valves shall be of heavy duty suitable for the hydraulic test pressure stated and installed with the valve stems truly vertical or horizontal.

ni van mt bch, v v , c nh r, chi tit ca mt bch phi ph hp vi tiu chun thch hp. Mt bch ca van v mt bch lp cng phi cng tiu chun Anh, c loi v kiu mt bch thng dng s c dng trong sut hp ng ny.

Where flanged valves, etc., are specified, details of flanges shall correspond to the appropriate specification. Valve flanges and counter flanges shall be to the same British Standard and a common flange type and rating shall be employed throughout this Contract.

Thm vo v tr ng h p sut, van kim tra bng kim loi nng sng kch c 10mm hoc 15mm c lp trn ng ht v y kim tra.

In addition to pressure gauge locations, gunmetal test cocks 10mm or 15mm size shall be fitted on suction and discharge pipes for testing.

Van c ng knh 150mm v hn t v tr 2.200mm hoc cao hn so vi mt sn trong phng my phi c 1 hp chuyn ng vn hng bng dy xch, thng xung n 1.000mm trn mc sn.

Valves of 150mm diameter and above located 2,200mm or more above floor level within plant rooms shall have a chain operating gear descending to 1,000mm above floor level.1.16. Van phao hot ng kiu Pilot

Pilot operated float valves

All pilot operated float valves shall be of bronze valve body with brass and stainless steel working parts comply with the local Authorities.

Tt c cc van phao hot ng kiu pilot s c thn bng ng thit, cc chi tit lm vic bng ng thit hay i-nox ph hp vi yu cu c quan thm quyn a phng.1.17. Cng tc p sut

Pressure switches

Cng tc p sut phi c b tip xc bng bc, ph hp vi mc in p lm vic v dng in iu khin v phi iu chnh c lp cc im ng m v i vi cc vn hnh khc nhau.

Pressure switches shall have contact sets of silver, rated to suit the working voltage and current of the circuits controlled and shall have independent adjustments for the cutin and cutout point and for the operating differential.

Thng thng, phm vi p sut hot ng t 4 bar n 11 bar v chnh p iu chnh li t 0.5 bar n 1.0 bar. Trong bt k trng hp no, p sut lm vic ln nht ca cng tc p sut phi cao hn t nht 3 bar so vi p sut ln nht ca h thng.

The operating pressure range shall be 4 bar to 11 bar in general and the reset pressure differential shall be between 0.5 bar and 1.0 bar. In any case, the maximum working pressure of the pressure switch shall be at least 3 bar above the maximum pressure of the system.

Van cch ly s c cung cp cng vi cng tc p sut nhm mc ch bo tr v cch ly trong iu kin kim tra p sut thy lc.

Isolating valves shall be provided to the pressure switches for maintenance purpose, and isolation purpose under hydraulic pressure test conditions.1.18. Cng tc dng chy

Flow switches

Cng tc dng chy s l kiu t tch ri pha bn nc v bn in bng vch ngn. Tip im phi thch hp vi in p lm vic, dng in iu khin v phi lm bng bc hoc hp kim.

Flow switches shall be of magnetic type having the water side completely separated by a bulkhead from the electrical side. Contacts shall be suitable for the working voltage and current of the circuits controlled and shall be of silver or alloy.

Cng tc dng chy phi c kh nng chu c p sut th 16 bar hoc 1,5 ln p sut lm vic, bt k ci no ln hn trong sut 6 gi m khng c du hiu r r no.

Flow switches shall be capable of withstanding a testing pressure of 16 bar or 1( time the working pressure whichever is greater for six hours without showing any sign of leakage.1.19. B cng tc mc nc

Level switches

B cng tc mc b nc gm c b in cc inox, b iu chnh, v.v

Water tank level switches shall be of stainless steel electrodes, control unit, etc.

Tip im phi thch hp vi in p lm vic v dng in iu khin v phi lm bng bc.

Contacts shall be suitable for the working voltage and current of the circuits controlled and shall be of silver.

1.20. p k

Pressure gauges p k kiu Bourdon gm siphon v ng cong bng ng thau v ng ni n im o, ng knh mt ng h 150mm, theo tiu chun B.S 1780. Tt c cc ng h c kim en, chy vng quanh, du hiu mu ch p sut lm vic bnh thng v tnh theo kil pascal (kpa).

Pressure gauges shall be of Bourdon type with brass syphon and cock, and piping connection to the measuring point size to be 150mm diameter dial, conforming to B.S. 1780. All gauges shall have black pointer, red over run indicators, red mark at normal working pressure and calibrated in kilo pascals (kpa).

p k phi c p sut bng 150% p sut lm vic ln nht ti im lp t, bt chp p sut th thu lc no nh ch nh trong phn Th nghim v Vn hnh. p k c thang o khng vt qu 0.5 bar v gi tr thang o ln l 16 bar nu p sut ln nht t c ti im o l 14 bar hoc nh hn; v nu khng th 25 bar.

The pressure gauges shall be of the order of 150% of the known maximum working pressure expected at the tapping point, disregarding any hydraulic test pressure as specified in the "Testing and Commissioning" Section. Pressure gauges shall have scales with divisions not exceeding 0.5 bar and a maximum scale value of 16 bars if the maximum pressure experienced at the point of measurement is 14 bar or less; and 25 bar otherwise.

p k c gn trc tip vo ng v c dn nhn theo yu cu.

Pressure gauges shall be mounted directly on pipework and shall be labelled as specified elsewhere.

Van cch ly s c lp vo mi p k.

An isolating valve/cock shall be provided for each pressure gauge.

p k s c lp nhng v tr c th hin trn bn v, v ti b u ht v u y ca bm theo yu cu ca c quan thm quyn cho d c c th hin trn bn v hay khng.

Pressure gauges shall be installed where shown on the Drawings; and whether shown on the Drawings or not, at the suction end discharge of pumps, and to the Authorities requirements. 1.21. Ch th mc nc

Level indicators Ch mc nc bn ngoi c lp cho tt c cc b nc ngi bo tr c th d dng theo di mc nc ti li vo ca phng my bm

External level indicators shall be provided for all water tanks such that the maintenance personnel can easily view the water levels at the entrance of the pump rooms.

Ch mc nc bn ngoi s l kiu ng thu tinh c bo v bng ng kim loi.

External level indicators shall be of glass tube type protected by metal tubing.

1.22. Van gim p kiu t l

Ratio type pressure reducing valve Van gim p kiu t l gim p sut theo t l c nh bt k lu lng nc. iu kin dng chy ngc, van hot ng nh van mt chiu.

Ratio pressure reducing valves shall achieve a fixed ratio reduction in pressure irrespective of the water flow rate. In the reverse flow conditions, the valve shall operate as a positive nonreturn valve.

Vt liu van thch hp cho vic s dng gm cc thnh phn chnh nh thn van, cnh van, v.v, c lm bng kim loi nng sng (gunmetal)

Materials of the valve shall be suitable for use with major components such as valve body, seat, etc., constructed of gunmetal.

Van c thit k vi dy p sut u vo t 4 bar n 25 bar (60 psi n 365 psi) v l loi PN 25 ni mt bch theo tiu chun B.S. 4504: Phn 1.

The valves shall be designed for 4 bar to 25 bar (60 psi to 365 psi) inlet pressure range and shall be of PN 25 flanged connection to B.S. 4504 : Part 1.

p k km van cch ly c lp trc v sau ca mi van gim p kiu t l.

Pressure gauges c/w isolating valves shall be installed upstream and downstream of each ratio pressure reducing valve. 1.23. B iu chnh lu lng khng i

Constant flow regulators

Nh thu s cung cp v lp t b iu chnh lu lng hoc thit b iu chnh lu lng khng i cho tt c cc ph kin v khu vc, ph hp vi tiu chun CP 48 v yu cu ca cp thm quyn.

The Contractor shall supply and install constant flow regulator or flow control device to all fittings and areas in accordance with CP 48 and the Authorities requirements. 2. Lp t

Installation2.1. Khi qut

General Nh thu s cung cp nhn cng v vt t hon tt h thng ng v iu chnh s lp t theo lu lng thit k.

The Contractor shall provide all labour and material to complete pipework systems and shall leave the installation adjusted to the designed flow rates.

Tt c cc tuyn ng ni chung s c lp ph hp vi bn v nhng Nh thu s tnh n vic trin khai chi tit v phi hp ca cc h thng v tho d cc phn ca cng vic ny trong tng lai.

All pipe runs shall be installed generally in accordance with the Drawings but full allowance shall be made by the Contractor for the detailed development and coordination of the scheme and for the future removal and dismantling of sections of the Work

Tt c ng s c bo qun khng b r, r st v cu cn v ng s c v sinh hon ton trc khi lp t.

All pipework shall be free from burrs, rust and scale and shall be thoroughly cleaned before installation.

Trong sut thi gian lp t, tt c u h s c bt hoc y li ngn chn cht bn v trong qu trnh hon tt, mi h thng s c sc bng nc sch. Cc nt g khng c dng bt ng ng.

During the course of the installation, all open ends shall be plugged or capped to prevent ingress of dirt and on completion each system shall be thoroughly flushed out with clean water. Wooden bungs shall not be used for plugging pipework.

ni c 2 hoc nhiu ng i theo cng mt cch, ch cn chnh m bo tt c ng song song vi nhau v song song vi kt cu ca cao c, ngoi tr c yu cu cha cho thng hi, v.v. Sau ng c tch ri s cha khong trng cho php hon thnh ring bit vi mi ng.

Where two or more pipe runs follow the same route, care shall be taken to ensure that all are parallel to each other and to the building structure, except for the required allowance for venting, etc. Pipework which is to be subsequently insulated shall be so spaced to allow an individual finish to each. 2.2. dc

Falls

ng s c lp t vi dc chnh xc m bo thng hi v thot nc. Cc ng thng hi h v ng chng xi phng s khng c by nc no sut dc ng

Pipework shall be installed with correct falls to ensure adequate venting and draining. Open vent pipes and antisyphonage pipes shall not have any water trap throughout the entire pipe run. 2.3. Mi ni

Joints Khng c mi ni ng no c php lp chm trong tng hoc sn.

No pipe joints shall be permitted within the thickness of walls or floors.

Mi ni s khng gn hn 1.0m ngoi tr v tr cn cho cc ph kin.

Joints shall not be closer than 1.0m except where necessitated by fittings.

ng gang v ph tng s l loi u ni (spigot) khng c ng ni.

Cast iron pipes and fittings shall be of spigot type without sockets.

Mi ni Hubless bao gm ng lt n hi c thit k c bit. Vng sit (Collar) v vt kp bng i-nox

Hubless joints shall consist of a specially designed elastomer sleeve. Stainless steel collar and screw clamps.

Mi ni Hubless s chu p sut tnh ln nht 10 bar.

Hubless joints shall be statically withstand pressure to 10 bars maximum.

Mt thm s c lp ti y ca tt c ng thi ng, pha i din cc mi ni, trn cc an cong v cc ni khc theo yu cu cho d c c th hin trn bn v hoc khng. Cc v tr trn s thun tin cho vic kim tra v v sinh bt c lc no.

Access/Cleaning eyes shall be provided at the base of all stacks, opposite joints, on bends and elsewhere required whether shown on the Drawings or not and in such a position that they can be conveniently inspected and cleaned at all times. 2.4. Cht neo

Anchors

Cht neo c b tr kt hp vi cc v tr thay i hng ng v b gin n mt cch thch hp, v.v hp gim bt lc cng do gin n ca ng v p sut bn trong bng cch truyn lc n mt t hoc kt cu nhng im thch hp.

Anchors shall be positioned in association with pipework change in direction and propriety expansion compensators, etc., such as to absorb the stresses due to pipework expansion and internal pressures by transmission of such forces to the ground or structure at appropriate points.

Nh thu nn c bit lu rng ngoi mc ch gi ng ng, cht neo c th c s dng c lin quan n s kim tra ng ng, v vo thi im , cn thit c cc im cui cng ca phn chnh c th, c gi bng cht neo ngn chn mt phn tuyn ng b ko i do s tng mnh p sut v pha cui ca ng.

The Contractor should particularly note that in addition to serving the purpose of constraining the pipeline, the anchors may be used in connection with testing of pipework, and at such times, it will be necessary to have the extreme ends of the main being tested held with the anchors to prevent the pipeline drawing apart due to the thrust pressures exerted at the end of the pipe.

2.5. B ni mm v gin n

Flexible and expansion couplings Cc mi ni s c b tr sao cho lc ng sut ng trc, xon v ng sut mt bn do s gin n v/hoc lng s khng c truyn n ni mt bch ca my mc thit b.

Trong qu trnh th tng phn, Nh thu s m bo b ni gin n c ging, neo v di chuyn thch hp trnh lm tn hi n on ng nhng.

The couplings shall be arranged such that torsional, coaxial stress and lateral stress caused by expansion and/or settlement shall not be transmitted to the flanged connections of the plant. During sectional testing, the Contractor shall ensure that the expansion joints are adequately tied, anchored or removed to avoid damage to the bellows. 2.6. ng lt

Pipe sleeves

v tr ng chy xuyn qua tng b tng, sn, v.v v tr kh, Nh thu s cung cp v lp t cc ng lt.

Where pipe pass through RC walls, floors, etc. in dry areas, the Contractor shall supply and install pipe sleeves.

v tr ng chy xuyn qua tng b tng, sn tip xc vi nc, mt bch chn cht kn nc lm cng loi vt liu nh ng ni s c nh thu cung cp v lp t.

Where pipe pass through RC walls, floors in contact with water, liquidtight puddle flanges made from the same material as the connecting pipe shall be supplied and fixed by the Contractor.

ng lt cho ng gang v thp s bng thp trng km. i vi ng ng v ng nha, ng lt s lm bng nha.

Sleeves for cast iron and steel pipes shall be galvanised steel. For copper and plastic pipes, the sleeves shall be plastic.

v tr ng lt c lp xuyn sn, ng lt s ko di t nht 50mm so vi mt sn hon thin.

Where sleeves are fitted through floors, they shall extend to at least 50mm clear of finished floor.

ng lt s c kch c tng xng cho php tuyn ng dch chuyn t do, v vi ng c cch nhit, ng lt c kch thc ln lp cch nhit xuyn qua ng lt.

Sleeves shall be of sufficient size to allow free movement of pipes and where pipes are insulated, the sleeves are to be oversized to allow the insulation to be carried through the sleeves.

v tr ng trn chy xuyn qua tng, trn v sn, ai thp nh c l kho bn l c s dng. Tt c tm kim loi l thp m crom v cc mu ny c trnh cho Qun l d n kim tra.

Where exposed pipes pass through walls, ceilings and floors, hinged mild steel escutcheon rings are to be used. All plates are to be chromium plated steel and samples of such plates are to be submitted to the Project Manager for checking.

ng lt cng s c lp t ni ng xuyn tng bn ngoi v mi. Nh thu s trm khong trng gia ng lt v ng ng hay cch nhit bng hp cht mastic chng thm do kn nc v kh.

Pipe sleeves shall also be provided where piping penetrates external walls and roofs. The space between pipe sleeves and the pipe or insulation shall then be completely caulked by the Contractor, with a soft, nonsetting waterproof mastic compound giving an air and watertight seal.

Ch xuyn qua mi cng s c lp t vi tm chn chng thm v ko di ti r tng ng hoc s cung cp khc nh ch nh u hay th hin trn bn v.

Penetrations through roofs shall also be provided with a weatherproof apron and up stand curb or other provisions as may be specified elsewhere or shown on the Drawings.

v tr ng chy xuyn qua tng chu la v sn, kim loi ngn la c hn hay bt cht xung quanh ng. N s c dng mt bch dy 6mm t gia b dy tng/sn v c hn/bt vt vo ng, mt bch c cng ng knh l trong ca ng lt.

Where pipes pass through fire walls and floor slabs, a metal fire stop is to be welded or bolted around the pipe. This shall be in the form of a 6mm thick flange located in the centre of the slab/wall thickness and welded/screwed to the pipe, the flange being of the same diameter as the internal bore of the pipe sleeve.

Loi vt liu ngn la c ph duyt s c lp t cho tt c ng uPVC xuyn qua sn lu 1.

Approved type of fire stopping material shall be provided for all UPVC pipe penetrating 1st storey slab. 2.7. ng i chm/ngm

Buried pipes

All metallic pipe (except gas pipe) buried in ground shall be wrapped with an impregrated protective tape such as Denso or equal.

Tt c cc ng kim loi (tr ng kh t) lp ngm di t c bao bc bi lp bng bo v nh l Denso hoc tng ng.2.8. ng bn ngoi trn mi

External pipes on roof

ng cp nc lnh trn mi phi trn di nh nng mt tri c bao bc bng v nha PVC che chn khi nh nng trc tip.

Cold water supply pipe on roof exposed to sunlight shall be provided with PVC cover to shield off from direct sunlight. 2.9. Thot nc sn

Loor drains

Tt c thot sn v by hi s c cung cp vi np bng i-nox.

Floor drains inside plant rooms shall have cast iron grating fitted with brass flat head countersunk screw. ng thot nc sn trong cc phng my mc thit b s c lp by thot bng gang vi np phng vn ren.

All floor waste and traps shall be provided with anti-mosquitos device c/w stainless steel cover grating. 2.10. Phn cui ca l thng ng thot cht thi rn / nc

Termination of soil/waste vents Tt c cc l thng hi ng thi cht thi rn/nc s c thng thng qua mi, cch xa bt k l m v mi nh no gn (nu c), ti cao theo quy nh. Tt c cc ng thng hi phi c lp qu cu thng bng li thp m km vo phn cui l m ca ng nhm bo v ng.

All soil/waste vent pipes shall be terminated above roof, away from any building opening and private roof terrace and at a height comply with Authority requirement. A galvanised steel wire vent balloon shall be securely fixed to the open ends of all vent pipes. 2.11. L cp gi ti

Fresh air inlets

Tt c l cp gi ti vo h kim tra v h thm c lm bng gang. Np ca thng gi s cung cp trong ph kin. ng cp gi ti ko di n cao trn ca tng trt hoc c ch r trong bn v hp ng.

All fresh air inlets to the inspection chamber and manholes shall be constructed in cast iron. Flap ventilator shall be provided in the fitting. The fresh air intake pipe shall be extended to the ceiling level of the ground floor or as indicated on the Contract Drawings. 2.12. Nt lm v sinh

Clean outs

Nh thu s cung cp v tr th hin v theo yu cu, loi v kch c nt lm v sinh cho sn v tng vi np bng cc khu vc hon thin.

The Contractor shall provide where shown and as required, types and sizes of floor and wall clean outs with coverplates in finished areas.

Tt c nt lm v sinh phi d tip cn v chng r r.

All clean outs shall be easily accessible and shall be leakproof.2.13. V tr ng

Pipe position

Nh thu s phi hp v tr ca ng cp v ng thot nc. ng cp nc s lun lp t bn trn ng thot nc. Nu nh iu kin khng th thc c, th s lp 1 mng thp khng r bn di ng thot v c ng thot thot v phu thu sn gn nht

The contractor shall coordinate the position of water pipe and sanitary/waste pipe. The water pipe shall always be installed above the sanitary/waste pipe. If such position cannot be achieved due to site conditions, a stainless steel tray shall be provided under the sanitary/waste pipe with proper drain pipe to the nearest floor trap.

ng cp nc khng i qua phng ng, hoc sau gng

Water pipe shall not be located on any bedroom wall of another unit and directly behind mirror or wall robe. 2.14. Th nghim

Testing

Tt c h thng ng s c th nghim theo mc "Kim tra v nghim thu" ca Tiu chun k thut.

All pipework systems shall be tested in accordance with the "Commissioning and Testing" Section of the Specification. 2.15. Hon thin

Finished

Tt c cc thit b trong h thng ng hoc kt ni vi ng s c sn theo ch nh.

All equipment forming part of the pipework system or connected to the pipework shall be painted as specified.

Bt k h hng xy ra trong qu trnh hon thin phi c iu chnh trn cng trng Any damage to factory applied finishes shall be made good on site in the manner recommended by the manufacturer and to the satisfaction of the Project Manager.

2.16. Nhn dng

Identification

Tt c cc ng, van v ph kin c cung cp m bo vic nh du nhn dng v dn nhn theo yu cu.

All pipework, valves and fittings shall be provided with identification markings and labels as specified.

Vic dn nhn c nu r trong mc "mc ph" ca Tiu chun k thut

Construction of identification labels shall be as specified in the Miscellaneous Provisions Section of the Specification.

BNG 3.1 - CC LAI NG

TABLE 3.1 -

PIPEWORK CLASSES Phc v/ ServiceV tr/ LocationNc lnh/ Cold Water

Nc nng/Hot

Water

Cht thi rn v nc thi/ Soil & Waste

Thng hi/ Vent

Kh t th/ Town

Gas

ng ngm/ UndergroundDCBBB

Tng hm/ BasementDCB/G*GH

ng ng/ Vertical RiserDCE/G**EA

Snh thang my/ Lift Lobby----H

Trung chuyn/ TransferD----

Bn trong cao c/ Within BuildingCCEEC/H

Bn trong hnh lang thot him/ Within Exit Corridor---H

Bm trung chuyn/tng pTransfer / Booster Pump C----

Bn trong b ncInside Water TankI----

Ghi Ch :

Note :

Loi B dng cho chn, loi G dnh cho mc cao

Class B for cast-in, Class G for high level

Loi G dng cho tng mi

Class G for Penthouse units. BNG 3.2 - YU CU K THUT CA NG

TABLE 3.2 - PIPEWORK SPECIFICATIONS

Loi ng/ Pipework Class

ng knh danh ngha Nominal Bore(mm)Tiu chun k thutSpecification

A20 150Thp trng km theo BS 1387 , loi trung Galvanised steel to BS 1387, Medium grade

BTrn 100100 & aboveng gang mm BS EN 598

Ductile iron to BS EN 598

Loi K9

Class K9

Bn trong = xi mng c hm lng alumin cao / xi nmng chu sunfat

Internal = High alumina cement/sulphate resisting cement

Bn ngai ph kim loi km v bitum

External = Metallic zinc and bituminous coating

C12 76ng ng tiu chun BS EN 1057:1994

Copper tube to BS EN 1057 : 1996

ng PPR (vi ph kin tiu chun) c th thay th khi c yu cu bi qun l d n.

PPR pipe (with standard fittings) can be alternative as specified by the architect.

DTrn 80

80 and aboveng gang mm theo tiu chun BS EN 545:1994

Ductile iron to BS EN 545:1994, Class K9. Loi K9

Class K9. Lai K9Bn trong = xi mng c hm lng alumin cao / xi nmng chu sunfat

Internal = High alumina cement/sulphate resisting cement Bn ngai ph kim loi km v bitum

External = Metallic zinc and bituminous coating

E25 - 200

UPVC SS213

UPVC SS213 ng UPVC theo tiu chun Sing SS213ng UPVC theo tiu chun Sing SS213

F20 and aboveng thp carbon en

Black carbon steel pipe, electric

Hn i n tr (FRW410) S dng loi thp 410 Mpa theo tiu chun BS 3600 v 3610

Resistance welded (FRW 410) using 410 MPa grade steel B.S. 3600 and 3601

G40 - 300ng gang Hubless theo tiu chun BS 416

Hubless Cast Iron pipe to BS 416

H15 - 200American Petroleum Institute (API) standard 5L Grade B.

ITt c cc kch cAll sizeThp khng g 316

Stainless steel grade 316 Thp khng g 316

Ghi Ch :

Note :

Tt c cc b ng cung cp cho hp ng phi c giy chng ch ca xng sn xut chng nhnph hp vi tiu chun sn xut v kim nh.

All batches of pipework supplied for the Contract must be provided with mill certificates certifying compliance of the manufacturing standards and testing.

BNG 3.3 - KHP NI THNG TRN NG NG

TABLE 3.3 - JOINT IN STRAIGHT RUNS OF PIPELoi ng

PRIVATE Pipework

Class

ng knh danh ngha

PRIVATE Pipework

Class

Khp ni v vt liu

Joints and Materials

A20 - 50

65 - 150Rc co thp rn (malleable iron) trng km, (seat) cu vi vt liu khp ni theo tiu chun BS. 5292.

Galvanised malleable iron spherical seat unions with jointing material to BS. 5292.

Rc co thp rn, cu thp, ng thit, Vi vt liu khp ni theo tiu chun BS. 5292. Mt bch c chn bt ren trng km theo tiu chun BS.4504 : Phn 1 (PN16)

Galvanised malleable iron, bronze to iron spherical seat unions with jointing material to BS. 5292 galvanised steel screwed boss flanges to BS. 4504: Part 1 (PN16).

BTrn 100

100 & aboveKhp ni y dng u ni theo tiu chun BS EN 545:1994 vi ming m c dng c bit ca mi ni c kh EPDM ph hp vi cht cng tc trong ng.

Ming m nh hnh dn ng ngha l bng cao su thin nhin di m p sut nn c kh bng bulong u ch T

Push-in socket & spigot joint to BS EN 545: 1994 with specially shaped gasket of EPDM Mechanical joint suitable for pipeline conveying liquids. Employing lead tipped natural rubber under pressure gland with mechanical compression by means of T headed bolts.

C12 150

Khp ni thng theo tiu chun BS. 864 : Phn 2Capillary joints to BS. 864: Part 2.

D80 200Khp ni y dng u ni theo tiu chun BS EN 545:1994 vi ming m c dng c bit ca mi ni c kh EPDM ph hp vi cht cng tc trong ng.

Ming m nh hnh dn ng ngha l bng cao su thin nhin hay tng hp di m p sut nn c kh bng bulong u ch T

Push-in socket & spigot joint to BS EN 545: 1994 with specially shaped gasket of EPDM Mechanical joint suitable for pipeline conveying liquids.

Employing lead shaped gasket ie. natural or synthetic rubber under pressure gland with mechanical compression by means of T head bolts.

E25 200Mi hn dng dung mi theo tiu chun BS.4336 : Phn 1 dng dung mi

Solvent welded joint to BS. 4336 : Part 1 using solvent

F80 300Mi hn hoc v bc khp ni hoc khp ni c khc

Welded joint or dresser couplings or other mechanical joints

G40 300Khp ni Hubless, u ni rt dy vi ng lt n hi vng ai bng i-nox, sit cht bng vt, chu p sut tnh ti thiu 10 bar

Hubless, Heavy Duty coupling with elastomer sleeve and stainless steel collar, tightened with screws, to withstand a minimum static test pressure of 10 bar.

H15 200Hn theo tiu chun CP51

Welding to CP 51

Ghi Ch:Note:

Tt c cc mi ni ph hp vi p sut kim tra v vn hnh

All joints shall be suitable for system test and operating pressures. Tt c cc mt bch u c mt ni

All flanges shall have raised faces.

Tt c cc mt bch l loi PN16 hoc cao hn thch hp vi p sut kim tra v vn hnh ca h thng

All flanges shall be PN 16 or higher if to suit system operating and test pressure.

BNG 3.4 - KHP NI CHO THIT B

TABLE 3.4 - JOINTS FOR EQUIPMENT CONNECTIONS

Loi ng

PRIVATE Pipework Class

ng knh danh ngha

Nominal BoreKhp ni v vt liu

Joints and Materials

A15 - 150Nh i vi ng thng

As for straight pipe runs

B150Khp ni mt bch theo tiu chun BS 4504 phn 2

Flanged joint to BS. 4504 : Part 2

C12 - 150

Khp ni nn theo tiu chun BS 864 phn 2

Mi ni hn nhit cho ng PPR.

Compression joints to BS. 864 : Part 2

dezincification resistant (DZR)Polyfusion weilding or butt weilding for PPR

D100 - 200Khp ni mt bch theo tiu chun BS 4504 phn 2

Flanged joint to BS. 4504 : Part 2

E25 - 200

Khu v c ni cho ph tng thot nc.

Socket & Spigot joint to sanitary Fittings

F80 - 300Khp ni mt bch theo tiu chun BS 4504 phn 2

Flanged joints to BS.4504 : Part 2

G15 - 200Khp ni mt bch theo tiu chun BS 4504 phn 2

Flanged joints to BS 4504: Part 2

Ghi ch :Note :

Tt c khp ni ph hp p sut th nghim v vn hnh ca h thng

All joints shall be suitable for system test and operating pressures.

Tt c mt bch u c g ni.

All flanges shall have raised faces.

Tt c mt bch l loi PN 16 hoc cao hn ph hp vi p sut th nghim v vn hnh ca h thng

All flanges shall be PN 16 or higher if to suit system operating and test pressures.

BNG 3. 5 - CHI TIT MT BCH

TABLE 3.5 - FLANGES DETAILS PRIVATE Loi ngPRIVATE Pipework

Classng knh danh ngha

Nominal

Loi mt bch v bin php kt ni

Flange Type and Method of Attachment

A15 150Mt bch thp trng km c phn li lm ren theo tiu chun BS.21, ng c t vo mt bch. Mt bch theo tiu chun BS.4504: Phn 1, Loi 4.

Screwed on galvanized steel boss flanges with taper threads to BS. 21, pipe expanded into flange. Flanges to BS.4504: Part 1, Type 4.

BTrn 100

100 & above

Mt bch gang mm c phn li lm ren theo tiu chun BS.4504: Phn 1, Loi 4, ming m ni theo tiu chun BS.4865 c lm bng cht liu si nn theo tiu chun BS.1737.

Screwed on ductile iron flanges to BS.4504: Part 1, Type 4, jointing gaskets to BS.4865 made of compression fibre to BS.1737. -

C12 - 150Mt bch kiu slip-on bng ng theo tiu chun BS.1723 hoc ng hn theo tiu chun BS.1724.

Copper slip-on flanes for brazing to BS.1723 or Welding to BS.1724.

D80 - 200Mt bch gang mm theo tiu chun BS.4505 : Phn 1, Loi 5 (PN16)

Ductile iron cast on flanges to BS.4505: Part 1, Type 5 (PN16).

E25 - 280

Mt bch theo tiu chun BS.4504: Phn 1, Loi 5 hoc 3. Dung mi hn s dng dung dch ximng theo tiu chun BS.4346: Phn 3.

Flanges to BS.4504: Part 1, Type 5 or 3. Solvent Welded using solvent cement to BS.4346 : Part 3. -

F80 - 300Mt bch theo tiu chun BS.4504: Phn 1, Loi 5 (PN16).

Flanges to BS.4504: Part 1, Type 5 (PN16).

G80 - 300Mt bch Intergrally cast theo tiu chun BS 4504 : Phn 1, Loi 5

Intergrally cast flanges to BS 4504 : Part 1, Type 5 (PN 16)

Ghi ch:

Note:

Tt c cc khp ni ph hp vi p sut h thng.

All joints to be suitable for system pressure.

Tt c cc mt bch u c mt ni.

All flanges shall have raised faces.

Tt c cc mt bch loi PN16 hoc cao hn ph hp vi p sut kim tra v vn hnh ca h thng.

All flanges shall be PN 16 or higher if to suit system operating and test pressures.

BNG 3.6 - PH TNG NG

TABLE 3.6 - PIPE FITTINGS

PRIVATE

Loi ng

PRIVATE Pipework

Class

ng knh danh ngha

Nominal

Loi mt bch v bin php kt ni

Flange Type and Method of Attachment

A15 - 150Ph tng ren bng thp rn trng km theo tiu chun BS.143 v 1256.

Galvanised malleable iron screwed fittings to BS.143 and 1256..

BTrn 100

100 & abovc Loi K12 bao bc nh i vi ng theo ch nh trong bng ADD/1/3.2

Ductile iron fittings to BS EN 545:1994.

Class K12 Wrapped as for pipework specified in Table ADD/1/3.2

C12 - 67

76 - 150

Ph tng ng dn ng theo tiu chun BS.864:Phn 2, dezincification resistant (DZR)

Copper capillary fittings to BS.864:Part 2, dezincification resistant (DZR).

Ph kin mt bch thp nng sng theo tiu chun BS.4054: Phn 2, dezincification resistant (DZR)

Gunmetal flanged fittings to BS.4054: Part 2 Dezincification resistant (DZR)

D80 - 200Ph tng thp mm theo tiu chun BS EN 545:1994 Loi K12 vi ni bch

Ductile iron fittings to BS EN 545:1994 Class K12 with flanged joint.

E25 200Ph tng c uPVC theo tiu chun BS.4346: Phn 1, Dung mi theo tiu chun BS.4346:Phn 3

Unplasticized PVC injection moulded fittings to S.4346: Part 1, Solvents to BS.4346: Part 3

F80 - 300Ph tng loi dy theo tiu chun BS 1965

Heavy weight fittings to BS 1965

G80 - 300Ph tng theo tiu chun BS.416

Cast iron fittings to BS.416

H15 - 200ng hn theo tiu chun CP 51

Welding to CP 51

Ghi ch:

Note:Tt c cc khp ni v ph kin ph hp vi p sut kim tra v vn hnh ca h thng

All joints and fittings to be suitable for system test and operating pressures.

Tt c cc mt bch u c mt ni

All flanges shall have raised faces.

Tt c cc mt bch u c PN 16 hoc cao hn ph hp vi p sut kim tra v vn hnh ca h thng

All flanges shall be PN 16 or higher if to suit system operating and test pressures.

BNG 3. 7 - KHANG CCH GI LN NHT

TABLE 3.7 - MAXIMUM SUPPORT SPACINGSPRIVATE

Loi ngPRIVATE Pipework

Class

ng knh danh ngha

Nominal

Tm gi

Support Centre (m)

A10 - 15

20

25 - 32

40

50

65 - 80

100

125

1502.0

2.4

2.7

3.0

3.4

4.0

4.0

4.0

4.0

BTrn 100

100 & aboveKhng ln hn 3m

Not more than 3m

C12 - 20

25 - 32

42 - 67

76

1.4

1.7

2.0

2.4

D80 - 200Cng vi ng loi B

Same as Class B Pipework

E25 - 300Cng vi ng loi B

Same as Class B Pipework

F80 - 300Cng vi ng loi B

Same as Class B Pipework

G80 - 300Cng vi ng loi B

Same as Class B Pipework

H15 - 200Cng vi ng loi B

Same as Class B Pipework

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