CNG TY TNHH MTV M NINH BNH CNG HO X HI CH NGHA VIT NAM PHNG K
THUT C IN c Lp T Do Hnh Phc
Ninh Bnh, ngy thng 12 nm 2014
QUY TRNH HN V X L NHIT SAU KHI HN (V/v: Hn ng nt trn ng ng ca ra
thp tng hp 16-R501)
Sau khi trao i vi Nh ch to DaLian, chuyn gia HQCEC, chuyn gia
cng ty CP HTH Trng Pht v Cng ty CP Lilama 69-3; phng KT-C xut phng
n mi sa vt nt, hn v kim tra sau khi hn nh sau :
STT Ni dung .V thc
hin Ghi ch
I.VT MP MI HN
- Dng my thi in cc than thi mi hn ti v tr nt cch lp vt liu c bn
khong 8-10mm, cch lp inconel 3-5mm. - Sau dng my mi cm tay + my
chut x l tinh ln cui theo yu cu ca cng ngh hn - Tin hnh kim tra PT
100% m bo khng cn vt nt.
Lilama 69-3
Theo bn v JGY131-7
Chi tit 1-15
II.GIA NHIT TRC KHI HN
Gia nhit kim loi c bn v mi hn c 2000 C 15
0C:
- Dng gia nhit bng in + m hi, axetylen h tr trc v trong qu trnh
hn. - Kim tra nhit bng sng o nhit .
X.in + Lilama 69-3
m bo gi nhit n nh trong sut qu trnh hn
III. PHNG PHP HN
- Hn lt TIG ban u 03 lp bng que ERNiCr-3
2.4. - Phng php hn SMAW ( hn h quang tay ). - Que hn OK NiCrFe-3
ca ESAB (que hn phi c sy kh 2000C trong 2h. Que hn mang ra hin trng
phi trong ng gi nhit m bo nhit 1000C). - Lm sch b mt trc khi hn:
loi b du m , mt st ... - Yu cu khng ch nhit trong qu trnh hn :
Trong c qu trnh hn khng ch nhit gia cc lp khng vt qu 3000C v khng
nh hn 2000C (dng sng o nhit kim sot , dng m hi h tr gi nhit khi
cn). - Mi hn phi tin hnh hn lin tc cho n khi hon thnh.
- Gia cc lp hn sau khi hn xong phi c th 100% MT.
Lilama 69-3
+ Cng ty
THT
IV. KIM TRA MI HN SAU KHI HN
STT Ni dung .V thc
hin Ghi ch
Sau khi hon tt cng vic hn sau 24h tin hnh kim tra mi hn bng cc
phng php sau :
Bng ngoi quan
o cng Cng ty THT
Kim tra bng 100% PT theo tiu chun JB/T4730.5-2005 t cp I.
X.Sa cha
Kim tra bng 100% UT theo tiu chun JB/T4730.3-2005 t cp I, cp k
thut C.
Cng ty THT
Kim tra bng 100% MT theo tiu chun JB/T4730.4-2005 t cp I.
Cng ty THT
V. X L NHIT SAU KHI HN
1.Tin hnh x l nhit: Duy tr nhit 6900C 14
0C trong thi gian 5h, tc nung nng 50
0C/h, tc lm ngui 700C/h .
Cng ty THT
2. Kim tra ln cui : Kim tra ngoi quan v o cng.
Cng ty THT
(C)
T
690C 14 C
0
C/h C/h
5h
400C300C
Biu x l nhit
Bng thng s hn: Que hn OK NiCrFe-3, phng php hn: SMAW
Stt Que hn Dng in (A) in p (V) Tc hn (cm/min)
01 3.2 100-120 20-24 15-20
02 4.0 130-140 20-24 15-20
Ni nhn: - Ch tch HTV ( b/c); - Tng Gim c; - Ph Tng gim c sx; -
P.AT-MT,SX,KT-CN; - Xng Sa cha, Xng in, Xng NH3; Cty lp my 69-3,
cng ty THT.
- Lu VT, P-KTC.
TNG GIM C
V Vn Nhn
PHNG KT-C
Phm c Hu
