1. ASTM A671 CC65 Class 33 Pipe yog dab tsi?
Txhais: Ibhluav taws xob-fusion-welded (EFW)carbon steel yeeb nkab tsim rauqis- kub thiab siab - kev pabcuam siab, ua raws li ASTM A671 tus qauv.
Qib: CC65 ua(carbon steel nrog tswj chemistry: Tsawg dua lossis sib npaug rau 0.30% carbon, Tsawg dua lossis sib npaug rau 1.00% manganese).
Chav kawm: 33(qhia qhov ntsuas siab tshaj plaws ntawm Chav Kawm 30-33, feem ntau raucryogenicyam).
2. Cov khoom tseem ceeb & cov khoom siv tshuab
Tensile zog: Ntau dua lossis sib npaug rau 65 ksi (448 MPa).
Kev sim cuam tshuam: Yuav tsum tau ntawm-50 ° F (-45 ° F)los yog qis dua (kom toughness nyob rau hauv txias heev).
Vuam: Longitudinal seams xav tau100% radiography (RT)los yogKev kuaj ultrasonic (UT).
3. Cov ntawv thov ib txwm
Roj & Roj: LNG pipelines, cryogenic cia tanks.
Fais fab nroj tsuag: Siab -cov kab hluav taws xob hauv cov huab cua txias.
Kev lag luam: Kev txhawb nqa rau Arctic infrastructure.
4. Chav Kawm 33 txawv li cas ntawm cov chav kawm qis (30-32)?
| Parameter | Chav Kawm 33 | Chav Kawm 30-32 |
|---|---|---|
| Tsim Siab | Siab tshaj (~ 330 psi) | qis (~ 300-320 psi) |
| Impact Test Temp | -50℃F lossis qis dua (qhib tshaj) | -20 ° F txog -50 ° F |
| NDT Requirements | 100% RT/UT + yeem PMI | RT/UT tej zaum yuav yog ib feem |
5. Cov kev xeem & ntawv pov thawj yuav tsum tau
Hydrostatic Test: 1.5x tsim siab rau ntau dua lossis sib npaug rau 10 vib nas this.
Daim ntawv pov thawj: Mill Test Reports (MTRs) nrog tag nrho traceability (chemistry, mechanical tests, NDT results).
Optional Tests: Charpy V-notch, hardness, and positive material identification (PMI).
