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Thanks XL83NL Response to your responses 1.I had doubt on using additional welds as reinforcement since codes (ASME VIII or ASME B 31.3)only mentions the minimum weld thickness and does not clearly says that additional weld should be considered as reinforcement. I do agree that these things...

Hello experts, As per clause 304.3.3 of ASME B 31.3 (Reinforcement of welded branch connections), Area A4 is the area of other metal provided by welds and properly attached reinforcement. While calculating the weld area , the minimum value of tc=0.7 Tb or 6mm (1/4 in.) ,except that larger...

Thanks XL83NL As far as I understood ,for seamless pipe ,weld joint strength reduction factor should not be used for wall thickness calculation. Use of “W” will unnecessarily increase the pipe thickness and weight which will induce more stresses at circumferential welds. If the designer or...

Dear Experts, As you are aware that clause 302.3.5 (e) of ASME B 31.3 recommends the use of weld joint strength reduction factor "W" for design of longitudinal and spiral welded piping components. But for circumferential welds ( at butt ends weld joints) it has been put on shoulders of designer...

Thanks again. I found your replies reasonably logical. If something else comes to my knowledge than I will share.

First off all thanks Mr. XL83NL. Appreciated.. Regarding your first reply to refer the construction code. While referring ASME B 31.3-2016, Table A-1M (pg-296) for spec no.564 -Forging and Fittings (UNS no. N04400),it mentions the maximum use of temperature as 482 deg C . So can i go with this...

Dear Experts, 1. ASME B 13.4 and 16.5 do have tables for P-T ratings in imperial as well as metric unit. So can we take advantage of conversion factors. For example Table 2-3.4 of ASME B 16.5 (for group 3.4 materials) allows the maximum temperature till 475 deg C but parallely table II-2-3.4...

Hello Experts, I need some clarification regarding the selection of bolting material between A193 and A320 specifically for stainless steel grades i.e B8,B8C,B8T,B8M etc. Standard specifications A193 and A320 , are for alloy-steel and stainless steel bolting materials intended to be used in high...

@ metengr (Materials) Thanks for your valuable response. I do agree that heavy wall thick vessels of Low alloy steels are more susceptible to "TE" as detailed in API 934 A,B &C. But from where this min thickness criteria( as you mentioned 3" and higher) comes from?

API 934 A,B,C and D clarifies the impact and preventive actions for Temper Embrittlement for thick Low alloy steel (1.25Cr0.5Mo,2.25Cr0.5Mo etc..)vessels but i have never found anything for LAS pipes? Does LAS pipes are not susceptible to Temper Embrittlement? I believe "TE" is related to...

@ XL83NL Thanks I am not able to download presentation paper "Comparison of ASME B31.12 Versus B31.3 for Hydrogen-Containing Piping in Refinery Services" under http://proceedings.asmedigitalcollection.asme.org/.... Could you help in that ?

Dear all, This code is explicitly developed for design, construction, operation and maintenance requirements for piping , pipelines, and distribution systems in hydrogen service. Material performance factors have been included to account for the adverse effects of hydrogen gas on the mechanical...

@pradipgoswami (Materials) Thanks for sharing it helped me a lot :)

Thanks to all for sparing time to respond. :) @pradipgoswami (Materials) NACE 8X194 clearly exclude piping and atmospheric tanks from its scope. So i believe this may not govern the Heat treatment requirements for piping in WET H2S service. I didn't mention API RP-941 for wet H2S service...

Hydrogen Service ASME 31.3 gives exemption from PWHT for P.No 1 (carbon steel piping material) irrespective of thickness with a clause of Preheating above 25mm nominal thickness . So still "carbon steel with PWHT" curve shall be applicable as per API RP 941 ? If yes than will there be any...