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In 2023 code edition, the title is UG-21 Design Pressure with 11 shown in superscript (blue font). What does this 11 represent and where it is written. Thanks in advance.

For ASME B31.3 piping system, what is the formula for calculating membrane stress ? Thanks in advance.

To be considered sour, is 0.3 kPa ppH2S limit applicable to stainless steel ? I can not find any reference to 0.3 kPa in ISO 15156-3. I can find this for carbon steels in ISO 15156-2. Please advise. Thanks What is the minimum ppH2S required to apply requirements of ISO 15156-3 for 316SS.

As per ISO 15156-3, for 316L SS pipe in sour service, is it correct that as per table A.2, the maximum temperature limit is only 149 deg C if we comply with pH2S, chloride, pH limits. Thanks in advance.

We are using a HIC tested plate for a pressure vessel. Are there any special requirements for welding and welding procedure from HIC point of view ? Is there such a thing called "HIC Tested Welding Procedure" ? Thanks in advance

Hi All, I am trying to convert HV1 to HV5 or HV10. 1. Table 1 of ASTM E140 shows vickers hardness as HV. What is the force value ? Is it HV1 or HV5 or HV10. 2. For a carbon steel material, is vickers hardness independent of force value ? i.e. 250 HV1 = 250 HV5. 3.How do you convert HV1 to...

Dear Peers, A shop built storage tank is designed and built to API 650 Appendices J & F. Can this tank be air tested in lieu of hydrotest. F.4.4 and F.7.6 seem to indicate hydrotest only. J.4.2.2 allows air test. Thanks for your response in advance. (I previously posted this topic in API...

Dear Peers, A shop built storage tank is designed and built to API 650 Appendices J & F. Can this tank be air tested in lieu of hydrotest. F.4.4 and F.7.6 seem to indicate hydrotest only. J.4.2.2 allows air test. Thanks for your response in advance.

Dear All (1) Is ASME B30.20 or ASME BTH-1 applicable to the design of lifting lugs used for pressure vessels ? (2) What is the difference between lifting lug and pad eye. Thanks in advance.

Dear Friends Does the seismic loading affect the shell wall thickness of horizontal pressure vessels ? Thanks in advance.

Client has ordered a U stamped pressure vessel with -29C MDMT. Client specification also states that lifting lugs shall be designed for -45C MDMT. Question: How do you establish the MDMT of lifting lug which design code can be used for MDMT Thanks in advance.

What are the chances of a normal SA516-70N plate passing a NACE HIC test per NACE TM0284. Please share your experience or thoughts. Thank You.

For projects in Northern Canada, where temperature can reach -40C and there is a lot of snow and rain. (a) Can pump with electric motor driver be installed outdoors ? (b) Is a building absolutely required for pumps (other than for comfort of operating and maintenance people) ? (c) If we order...

Our application falls under the scope of NACE MR0175/ISO 15156. Which standard provides (a) the list of acceptable elastomers and other non metallic materials suitable for sour service ? (b) Maximum H2S limit (ppm, H2S partial pressure etc) for elastomers ? Thank You.

Are TEMA and / or API 660 applicable to the design of double pipe heat exchanger ? Thank You.

Is ISO 15156 (latest) applicable to non pressure parts such as demisters ? Please provide your thoughts Thank You

Hi Fellows, We have issued a purchase order for a ASME U stamped pressure vessel. Specification states that SI units shall be used. Vendor has provided calcs in imperial units with a corrosion allowance of 1/8". We have specified a corrosion allowance of 3.2 mm in purchase order. Vendor...

What is the practical / maximum viscosity limit for centrifugal pumps ? Please advise. Thanks