Search results for query: *

Best design practice. ASME B31.8 shows either option without explanation. ANSI 150 4" std pipe branch on or in 8" std pipe header.

Preferred branch connection, in or out of header pipe?

What pressure / temperature chart do you use for flange material ASTM A694? ASTM A694 references ASME B16.5; however, ASME B16.5 does not have a material group for ASTM A694 which is used for high yield (pressure) transmission service. For example: for ASTM A105 flange material service I use...

BigInch, Thank you for this reference. A great site and a lot of good information. However, ASTM A-778 is still not listed. I do not understand why it's not showing up somewhere. I assume that I can still use the allowable stress from sources like these that are not actually from the ASME...

Where can I find the allowable stress for ASTM A-778 TP 304 stainless steel tube if it is not in ASME B31.3? Going Bonkers!

Does anyone know the reasoning behind natural gas companies hydrostatically testing main gas lines with the maximum test pressure being the lower of 103% SMYS of the lowest strength pipe or weld fitting, 1.5 times the flange rating or the valve shell test pressure? I've also seen 110% and 112%...

I wish to determine the MDMT for ASTM A212 BFBX material which is not in Sect. II Part D. This vessel was built in 1962 and the mateial was with drawen in 1967. All of this was before the advent of MDMT in the 80's. Is it permissible to use the UCS-66 curve A (carbon steel) to determine the...

I am making alterations to an old pressure vessel and re-rating it. The original U-1A form has a duel MDMT rating which I do not understand. It is rated MAWP 250 PSIG at 125 F with an MDMT of 20 F at 250 PSIG and -40 F at 125 PSIG. I do not see where the USC-66 chart has diferent temps for...

Thank you, Tom Barsh. That's it! I have been looking right at it without it registering. Thanks again for the "push" in the right direction! Bonkers

Yes, ASME BPVC 2010 VIII DIV. 1, Appendix 1-5. Internal pressure 1440 psig @ 130 degrees F.

I have a pressure vessel 36" diameter shell with an eccentric cone reducer to 16" diameter with a 16" weld neck flange. The reducuer is rolled plate. Does anyone know the design procedure for eccentric cone reducing shells? I was approaching this as a concentric reducer on one side and a...

Thanks to all responders! You have answered my question and given me direction and support! Thanks again, I'm going..... Bonkers

Yes, I plan to stiffen the support by welding cross brace members to the support legs. I could not find the pressure vessel limitations of the pressure vs. nonpressure zone. I want to stay away from the leg/vessel attachment weld. Is there a section in ASME BPVC Sect. VIII Div. 1 to support...

Can someone refer me to the welders qualification code. I am researching if welding to a vertical pressure vessel support leg requires special qualification, procedure and inspection if the portion of the leg is not contacting or within some predetermined length from the pressure components...

Tom, This is suposed to be a straight wall eccentric cone reducer without any "knuckle " radius for PV shell. Material SA-516 70N, 1" thick. Not pipe. -Bonkers

Thanks guys, good suggestions. I will research the PV Design Handbook but I don't like complex calculating, just the ordinary kind. My original design to the client did have a "stretched" cone of 34 11/16" with a 30 degree angle. The client advised that he has bought a cone and it was a...

ASME BPVC Sect. VIII Div. 1 Appendix 1-5 (g) states that conical sections (cone-to-cylinder junction) with a half-apex angle greater than 30 degrees may be used if the design is based on special analysis, such as the beam-on-elastic foundation analysis of Tomoshenko, Hetenyi, or Watts and Lang...

I have a pneumatic filled storage tank with a scrubber in the vent line to atmosphere. Once filled, for a brief time I will have air pressure on the tank until closing the air valve. I need to calculate this tank pressure to determine the fill pressure so as not to exceed the allowable tank...

I am requesting information for direct steam mold temperature control units for compression molding. I am converting from hot oil units. I need to know vendor sources and design tool info such as BTH/hr per lb. or sq. in. Max. temp. is 400 deg. F. Any tips and information on design...

I am confused! 1. When specifying MSS SP-75 WPHY-42 material, what is the ASTM material? (MSS SP-75 is a standard and not a material. WPHY-42 is a grade.) What material will I receive? 2. Is WPHY-42 the same as Y-42? Is one wrought pipe and the other forged? I see both terms. 3. ASTM A860...