Pressure Vessels and Codes
ASME codes, testing protocols, and design rules for pressure vessels, including MAWP, PWHT, and steam-out cases.
Pressure Vessel Design and Standards
Pressure vessels store/process fluids under pressure; ASME BPVC Section VIII Div. 1 governs unfired vessels, defining MAWP, testing, and fabrication.
Key Concepts
- MAWP: Max pressure at design T; accumulation ≤10% non-fire.
- Design T: ≥10°C above max operating T.
- Steam-Out Case: Accounts for high-T cleaning with vacuum risk on cooldown.
Fabrication and Treatment
- PWHT: Mandatory for C-steel >5/8" thick or lethal service (UCS-56) to relieve stresses.
- Hydro Test: ≥1.3x MAWP × stress ratio (UG-99).
- Pneumatic Test: ≥1.1x design P; higher rupture risk from gas energy—use only if hydro unsuitable.
Implots on P&IDs detail nozzle layouts.
These flashcards cover code compliance essentials.
What does the acronym MAWP stand for in the context of pressure vessels?
MAWP stands for Maximum Allowable Working Pressure.
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