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Hi, the statement about maximum control valve size of 6" is not sounding general, assume a 24" line which needs control valve to be specified, it will most probably be a 20" control valve. it is common to specify control valve size 1 or 2 sizes smaller than the main line, but if it come up with...

hi McDermott1711, hope "ASME B31.3 APPENDIX M, GUIDE TO CLASSIFYING FLUID SERVICES, Fig. M300 Guide to Classifying Fluid Services" can help you. base on the above guide, crude oil can be classified as normal fluid service. hope to be helpful Regards Ashkan

Hi, Would you please let me know what is difference between Standard test pressure and Alternative test pressure in table 26 in API 5L? as footnotes b and c set different criteria for these tests,what is the condition to use each one? thanks Ashkan

thanks bimr, TD2K, pennpiper and McDermott1711 I think it's better to make cold cut for that equal branch out. thanks again for your attention

Hi McDermott1711 MSS SP-75: Specification for High-Test, Wrought, Butt-Welding Fittings as you may consider through name of MSS SP-75, it is for wrought fittings,i.e. forged/formed. you may use the design code of your piping system to make such a welded branch connection and make the dimensions...

dear pennpiper and McDermott1711 thanks for your attention. it is a 32" x 20.6mm THK 600# sour gas service, design code asme B31.8 in Iran. we are at early stage of decision making regarding making a hot tap or cold cut. as reduced size connection will lead to lower flow to the branch line, I...

Hi We are considering hot tapping a branch connection to a 32" x 20.6mm THK pipeline. what is the largest branch size applicable? is it possible to make an equal connection? thanks, Ashkan

thanks alot EmmanuelTop

Hi every one, thanks for the explanations, dear bimr, what is the title of the book you provided that page from? thanks Ashkan

there are 2 lifetime related issues in the design, first: corrosion allowance which is (yearly corrosion rate)*(years of design life), this issue is explained above by LittleInch and bimr second item is expansion design and Flexibility Analysis of piping, this item in fact is not a continuous...

just cut the line for the length of valve+flanges in cold unstressed condition It is almost impossible to keep the line totally fixed during cutting and welding the flanges under that stress, besides the amount of strain in this section is proportional to the length of...