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.
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.
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...
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...
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.
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.
We have a pressure vessel which will be post weld heat treated. The vessel materials is SA516-70. Trays materials is 410S stainless steel. The trays are seal welded to the support ring (Carbon Steel).
We plan to perform the whole vessel PWHT after the seal weld of tray to support ring. But we...
Exchanger tubesheet is duplex 2205. Channel is carbon steel. The tube fluid is cooling water (1500ppm Chloride, <50DegC). What is the gasket materials for channel flange, Carbon steel, 316L SS, or Duplex Stainless Steel?
Thanks.
What is the terminology of NORMINAL COMPOSITION.
For example: ASTM A335 P11 (1.25Cr-0.5Mo). The Cr content is from 1.0% to 1.5%. What is the norminal composition of this material? 1.25%?
Dissimilar welding of p1 to P8 materials for a pressure vessel (ASME VIII div.1), plate thickness is 40mm.
(1) If materials are used for pressure parts, what is the preheat temperature I can use? Can I do PWHT for them?
(2) If materials are used for Non-pressure part, what is the preheat...
I have a couple of questions about FCAW and SAW Welding process.
(1) The vessel (SA516-70N) MDMT is -50F.
Can I use F7XT-9 as the filler metal and do impact test for the weld at -50F on the PQR? I am worried about it because it is recommended to do impact test at -40F (ASME II PARTC SFA5.20)...
In ASTM A312, welded pipe (for example 304SS) shall be made using an automatic welding process with no addition of filler metal during the welding process.
Can we specify ASTM A312 piping with filler metal? What is the main effect on piping property, using addition of filler metal?
Heat exchanger shell side: cooling water (Maximum Operating Temp. 40C). The cooling water has 1500ppm maximum Chloride and 60 wppm Oxygen.
Heat exchanger tube side: caustic (Maximum Tperating Temp. 146C).
We selected carbon steel for the shell and alloy 600 for the tubes.
In order to avoid...
Normaly, 304SS and 316SS are not used in high concentraion of Chloride condition in order to avoid pitting and crevice corrosion. How about carbon steel, do we need to consider chloride effect?
Can SA350 LF2-CL1 or SA350 LF3 flanges be used at high temperature? I am working on a vessel with a Design Temperature of 300degC. MDMT is -46C. Occasionally, the vessel will be exposed to 490degC (20Hours/Year). SA350 LF2-CL1 or SA350 LF3 can be used at low temperature. How about their high...
