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@r6155 Thank you for teaching me. In Japan, some of users and manufacturers misunderstand the function of color bolt. They believe that tubesheet with bolt holes is able to perform hydrostatic test without using a test ring. I have seen some of heat exchangers that the tubesheet is not even...

SnTMan, I confused “Supplementary Specification to API Standard 660 Shell-and-Tube Heat Exchangers,december 2018" to API regulation. This supplementary specification added technical consideration to API660 is published by The International Association of Oil & Gas Producers (IOGP) API and IOGP...

Hi, Why API prohivited the use of drilled and tapped hole on tubesheet since 2018 ? (but TEMA 10th Edition added the clause about collar bolt and drilled hole since 2019.) Did API discovered the something of bad things about drilled and tapped hole ? Quote: Supplementary Specification to API...

LittleInch,thanks for your reply. opinion1 is not safety for hydrostatic test. I persuade the design section manager to calculate adaquate torque for hydrostatic test.

hi, Our company manufactures shell and tube heat exchanger. current spec is following: ◎code : ASME sec.VIII div.1-1998(by customer's local regulation) ◎working pressure…shell:0.2MPa /channel:6.3MPa ◎design pressure…channel:7.0Mpa ◎hydrostatic test pressure…channel:11.0Mpa(by customer's...