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metengr, Thanks for your comments. That means we can not reach a conclusion just based on the radial ridges, right? When I saw the radial ridges, I thought they may suggest fatigue related failure.

Little more background information. It was from a carbon steel steam pipe. A crack was observed along a circumferential weld.

Guys, please take a look at the attached photos and help me answer the following questions. Was the fracture caused by fatigue? Is it possible that the fracture is caused by stress corrosion cracking? Thanks a lot.

moltenmetal, EdStainless Thanks for comments. So how about 50% Calcium Bromide?

moltenmetal: wet hydrogen bromide (vapor). One more questions is the material for hydrobromic acid. Thank you so much!

I am selecting pipe materials for 50% Calcium Bromide and hydrogen bromide. Can any one with experience recommend the materials suitable for these service? Thanks.

Thanks: METENGR, STRIDE6, and EdStainless EdStainless: If seal welds brass and CuNi can not be obtained, How to make the tube to tubesheet joint, Heavy expansion?

I need your advice on the filler metal selection for tube to tube sheet welding (GTAW Process): Tubesheet: SB171-46400 (Naval Brass, 60Cu-40Zn) Tube-1: SB111-44300 (Admiralty Brass, 70Cu-30Zn) Tube-2: SB111-71500 (70Cu-30Ni) (1): what filler metal should be used for SB111-44300 to SB171-46400...

If we assume the depth of bury is 6 ft. Is it ok for CPVC pipe?

Undergroud pipe is designed for the sulfuric acid drain system. The concentration of the sulfuric acid is unknown. What kind of material is suitable for this service? How about plastic like PVC or CPVC (Chlorinated PVC)? I worry about that the plastic pipe can not resist the underground...

I have a similar questions. What are the ASTM, EN and BS specification No's for 304SS Structral Steel (I-Beam or H-Beam)? Thanks.

Could any tell me the ASTM, EN and BS specification No's for 304SS Structral Steel (I-Beam or H-Beam)? Thanks a lot.

all, Thanks for your advise.

Carbon steel pipe: ASTM, A106-B; 18" SCH80;Maximum Design Temperature: 427 DegC 2.25Cr-1Mo:ASTM A335 P22, 18" SCH60;Maximum design Temperature 515 degC Flange rating: 1500# Service condition: High pressure steam: 427 DegC.

How to determine the hydro test pressure of a dissimilar welded pipe system (carbon steel to 2.25Cr-1Mo). According to ASME B31.3, the test preussre can be determined by Pt=1.5*P*St/S. Now we have two values for the hydro test. Which one we should use, the lower one or the higher one? Thanks.

Maximum Operating is 440 DegC. Looks like 304 should not be used, right? Do I need to specify that 321SS should be stabilized? How about the solution treated 321SS?

I have a heater which is in hydrogen service. The maximum design temperature is 520 DegC. Can I use 304 SS at this temperature? Or do I need to select stablized 321 SS for this service?

API 600, GATE VALVE, TRIM 8 What does trim 8 mean? The wedge surface should be 13Cr and base metal equal to or better than body materials; The body seat surface should be hard faced and base metal equal to or better than body material. Am I right? Thanks.

The vessel is in caustic service

Our client do not accept the 410S welding without PWHT.