| ASTM A774 |
- Specification covers five grades of stainless
- Specification covers 3 in. through 48 in.
- Specification covers wall thickness from .062 - .500
- Does not require annealing
- Specification is for low pressure piping and is intended for low and moderate temperatures and general corrosive service.
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| ASTM A-403 |
- Specification covers wrought stainless steel fittings and pressure applications.
- Specification covers many grades of stainless
- Two major categories of A-403 fittings:
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| ASTM A-403CR |
- Normally a fabricated fitting rather than formed.
- Does not require non-destructive testing.
- Does require annealing.
- Shall meet requirements of MSS-SP-43
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| ASTM A-403WP |
- Class WP-S: Shall be seamless construction and meet requirements on ANSI B16.9, B16.28.
- Class WP-W: Any welding done with the addition of filler metal requires X-ray.
- Class WPW-X: ALL welds must be X-rayed.
- Class WPW-P: ALL welds must be ultra-sonically examined.
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| SPECIAL: STUBENDS |
- WPWBU: Cold formed stub-ends that have weld metal added for dimensional reasons.
- Stubends with entire lap from from weld metal testing required if marked:
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A. WPW - radiographic inspection of lap is required.
B. WPWX - Radiographic inspection of all welds is required.
C. WPWU - Ultrasonic inspection of all welds is required.
D. CR - Non-destructive examination is not required. |
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