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...
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...
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...
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...
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...
What is the significance of the "M" in A 105M? Is this two separate materials? Also does A 105 come in grades? I'm trying to choose the correct flanges i.e. F42 through F 70.
Thanks,
Bonkers
I am sizing a PSV for a natural gas compressor station fin-fan gas cooler. What is the proper sizing design procedure? The customer has requested the fire protection case. Sizing per API 520 requires a seemingly large valve. However, reference material that I have seen tells me that the PSV...
With reference to a buried natural gas pipeline road crossing, I have calculated the total combined stress on the pipe. I now have the % SMYS value. My question is what do I use for the maximun allowable limit for an ASME B31.8 location class (3)? Do I use the basic design factor(F) which is...
Does anyone know the pressure rating for carbon and stainless steel classes below -20 deg. F? Everything I've researched stops at this temperature. I know some nickel alloys are for low temp (cryogenic service). I have an application for -25 deg. F and need to know the pressure limit.
Does anyone know a supplier of slip-on reducing flanges or have they been completely discontinued? I have need of a 6"-600# slip-on flange with a hub for a 2" pipe. I have found old descriptions and how to order but as yet no supplier.
