CaRs 0226(R1)_DMPP Reply_ATT_02_TCVN 2622-1995

8/10/2019 CaRs 0226(R1)_DMPP Reply_ATT_02_TCVN 2622-1995

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VIETNAMESE STANDARD TCVN 2622 : 1995

English version collected and edited by Cityboy 2007-11-25 - 2 -

Table 1

Productioncategories

Natures of substances and materials availablein production processes

AFire and

explosion risks

Gases having lower limits of combustion and explosion concentration notmore than 10% of air volume and liquids having a flash temperature below28 0C, if these liquids and gases can form a mixture which is easilyexplosive with a volume over 5% of room air volume; substances that canexplode and fire when interact with one another, water or oxygen in theair.

BFire and

explosion risks

Gases having lower limits of explosion concentration more than 10% ofair volume, liquids having a flash temperature from 28 0C to 61 0C, liquidsbeing heated in production conditions up to or over the flash temperature,combustible dusts or fibers having lower limits of explosion not more than65g/m3, if these liquids, gases and dusts or fibers can form a mixturewhich is easily explosive with a volume over 5% of room air volume.

CFire risks

Liquids with a flash temperature over 61 0C; combustible dusts or fiberswith lower limits of explosion more than 65g/m3; combustible solidsubstances and materials. Substances that can only start fire when interactwith water, air or when interact with one another.

DNot showing

any dangerousproduction natures

Non-flammable substances and materials in hot, hot red and meltingstates, that working processes associated with the generation of heatradiation, sparks and flames; solids, liquids and gases are combusted orused as fuel.

ENot showing

any dangerousproduction natures

Non-flammable substances and materials in a cold state.

FExplosion risks

Gases that are inflammable not through liquidization, dusts associatedwith explosion risks with the quantity that can form an explosive mixturewith a volume exceeding 5% of room air volume where according to theconditions of technological processes only will explosion occur (notassociated with fire). Substances that are explosible (not associated withfire) when interacting with one another or with water, oxygen and air.

Notes:

1) Production structures of respective production classes to see appendix B;2) Storehouses according to the natures of fire and explosion risks of the goods and

materials stored therein to determine production classes in accordance with theregulations in Table 1;

3) Production technologies using combustion fuel that is liquids, gases and steams orbare flame do not belong to production classes A, B, C.

2.4. Construction materials and components are divided into three groups according to theircombustion levels: incombustible, uninflammable, and combustible. See appendix A.


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Table 2

Fire resistance levels (minutes) Type of fire

resisting

constructionof a building

Columns,bearing

walls,elevatorschambers,staircase

Landings,steps and

othercomponents

of stairs

Outside

(external)non-bearingwalls

Inside

non-bearingwalls(partitions)

Paving tilesand other

bearingcomponentsof floor

slabs

Paving tilesand otherbearing

componentsof roofs

(1) (2) (3) (4) (5) (6) (7)

I 150 60 30 30 30 60

II 120 60 15 15 45 15

III 120 60 15 15 60 Not stipulated

IV 30 15 15 15 15 Not stipulated

V Not stipulated

Notes:

1) In buildings with fire resistance level III, first and second storeys floors must be madeof uninflammable substances, basement or wall-foot floors must be made ofincombustible substances, with fire resistance levels not below 60 minutes;

2) In buildings with fire resistance levels IV and V, basement or wall-foot floors must bemade of uninflammable substances with fire resistance levels not below 45 minutes;

3) In production, application or storage rooms of combustible and inflammable liquids, floors must be made of incombustible substances.

4) For buildings with roof basements that roofs bearing structures are incombustiblesubstances, roofs are allowable to be made of combustible substances and notdepending on fire resistance levels of the buildings;

5) For buildings 30m and less distant from steam-engine train railways, roofing are notallowed to be made of combustible substances;

5.2. An increase or reduction in the fire resistance levels of some construction componentscannot be considered as upgrading the fire resistance levels of a building or structure.

5.3. For fire resistance levels I&II, it is allowable not to comply with fire resistance levels asalready defined in table 2 when:

a) Using steel structures without protection in one-storey production buildings, and notdepending on considerations of fire risks of produced items arranged therein;


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b) Using steel structures without protection in multi-storey production buildings whenproduced items D and E are arranged therein;

c) Using steel structures in multi-storey production buildings when technologies of A,

B and C classes are arranged therein on conditions that steel structures must beprotected by incombustible substances with fire resistance levels not below 45minutes in all storeys, except the top storey;

d) Using steel structures to cover the roofs, basements and floors in public buildingsand structures with types of fire resistance I, II that the steel structures are protectedby combustible substances or fireproof paints, with fire resistance levels not below45 minutes. For public buildings and structures having ten storeys and more, theirsteel structures must be protected by fireproof materials, with fire resistance levels

not below 60 minutes.

Fire resistance levels (minutes) of major wooden components in one-storey buildings ofindustrial works, public works, production buildings storehouses with types of fire resistingconstruction II are defined in table 3.

Table 3

Major wooden componentsTypes of fire resisting

construction of buildings,structures Columns Outside wallsmade ofhanging panels

Roofs Inside bearingwalls(partitions)

II 120 30 30 45 15

Notes:

1) For production buildings, public buildings and structures, storehouses and produced items B buildings, components stated in table 3 must be processed for fire protection;

2) It is not allowed to use above-mentioned components for production buildings,storehouses with produced items A and B.

5.5. Minimum fire resistance levels (minutes) of fire-blocking parts or in buildings of allfive types of fire resisting construction are defined as below:

Fire-blocking parts Minimum fire resistancelevels (minutes)

1. Fire-blocking walls 150

2. Doors, windows and gates in fire-blocking walls 70

3. Fire-blocking partitions 45


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The distances from a fire fighting water reservation lake to a building with fire-resisting types III, IV, V or to an open-air store house made of combustiblesubstances, is at least 20m, and to a building with fire-resisting types I, II, is at least10m.

Appendix AMaterials group according to fire levels

1. Materials of incombustible groups consist of natural or artificial inorganic materials,metal, board or fiber plasters with organic contents up to 8% in weight, mineralcotton-like materials boards in synthetic or natural or bitumen-agglutinated formswith organic contents up to 6% in weight.

2. Materials of uninflammable groups consist of mixtures of incombustible materialsand combustible materials, e.g.: asphalt concrete, fibro-cement, plaster materials andconcretes with organic contents over 8% in weight, mineral cotton-like materialsboards in bitumen-agglutinated form with organic contents from 7% to 15%. Claymixed with straw with volume of at least 900 kg/m3, fiber plates soaked inincombustible solutions, wood steeped and soaked in incombustible chemicals,cement-pressed fibers, polymer materials that meet requirements for incombustiblematerials.

3. Combustible materials, consisting of materials of organic type materials not steepedand soaked in incombustible substances.

Appendix B (for reference)Production industries groups classified by production classes

Productionclasses Production properties Production industries

(1) (2) (3)

A Fire and explosionhazards

Workshops making and using sodium and potassium;workshops and plants producing artificial fibers, rubber,hydrogen producing stations; chemical workshops of near-silkplants; oil and petroleum producing workshops; gashydrogenation, distillation and division workshops; workshopsproducing artificial liquid fuels, recovering and distillationdissolvable organic liquid substances with inflammationtemperature in gas states of 28 0C and less, stores for gascylinders, petroleum stores, rooms for storing alkali and acidaccumulators of power plants, pump stations of liquidsubstances with inflammation temperature in gas states of 28 0Cand less.

B Fire and explosionhazards

Workshops producing and transporting coal dusts, saw dusts,stations for cleansing diesel oil drums and other liquids withinflammation temperature from 28 0C to 61 0C. Solid matter

grinding compartments, workshops for manufacturing artificialrubber, sugar producing workshops, coal dust grinding

equipment, diesel oil stores houses of power plants, pump

stations of liquid substances with inflammation temperature ingas states of 28 0C to 61 0C.


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(1) (2) (3)

C Fire hazards

Timber sawing workshops; workshop producing timber fine artarcticles; timber models, timber boxes; textile and garmentfactories. Workshops of textile industry, paper industry with dryproduction processes, raw processing of cotton, jute and otherfibers; sift and winnow workshops of grinder mill and grainwarehouses. Oil reproducing workshops, bitumen refinery,combustible materials storage or oil storag; open-air oil storageand oil storage devices of power plant; power distributiondevices with power breakers and electrical equipment with oilvolume more than 60kg per unit; bridges and/or corridors fortransportation of coal, peat, close coal storage, warehouse withassorted goods; pumping stations for liquids with combustibletemperature of gas more than 61 oC.

DNot showing

hazardous propertiesof production

Wood sawing workshops, workshops making wooden art

objects, workshops making mock-up products, wooden boxproducing workshops, knitwear and garment plants. Industrialweaving and paper workshops with dry production processes,enterprises engaged in preliminary treatment of cotton fibers,plants engaged in preliminary treatment of flax, jute and other

fibers, screening departments of grinding plants and seed stores.Lubricant recycling workshops, lubricant refinishing and tar

distillation plants, incombustible substance and lubricant stores,open-air oil stores and lubricant storing equipment of powerplants, electricity distribution equipment with breakers and

electric equipment with the quantity of lubricant over 60 kg foreach equipment unit, slides and corridors for transporting coal,

coal dusts, closed coal stores, mixed items stores, pump

stations of liquid substances with inflammation temperature ingas states of over 61 0C.

ENot showing

hazardous propertiesof production

Casting and metallurgy workshops, furnace units of gasproducing stations, forging workshops, welding workshops,repair stations for steam and combustion motor locomotives,

metal hot-rolling workshops, combustion motor testing station,internal combustion engine holding compartments, thermalmetal working shops, main buildings of power plants (i.e.

buildings with furnace compartments, turbine compartments,etc), electric equipment with the quantity of lubricant over 60 kg

for each equipment unit, high voltage electricity testinglaboratories, boilers stations, etc.

F Explosion hazards

Notes: Production industries where combustion fuels are liquids, gases or using steady round

flames are not of production classes A, B, C.

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CaRs 0226(R1)_DMPP Reply_ATT_02_TCVN 2622-1995