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  1. sakthi06.dec

    ISO 7-1 Rc 1.5 thread minimum engagement

    Hi experts, I need to understand the following situations with respect to Rc 1.5 thread engagement. Per design, there's a threaded thermowell stub used in high pressure boiler with Rc1.5 internal taper thread. Whereas the connecting thermowell has an external taper thread of R1.5. 1. Under...
  2. sakthi06.dec

    Cold forming of hot-finished tubes: ASME Sec-I (2019)

    Hi experts, In the 2019 edition of ASME Sec-I, requirements concerning Cold forming of 'C' and 'c-Mo' steels are added. In PG 20.1.1, the defining conditions for PFHT are given. I am confused with ref to hot-finished tubes. PG-20.1.1(c)has the following text: "Alternately, when strain...
  3. sakthi06.dec

    PWHT heating and cooling rates

    Why is heating and cooling rates not applied from ambient temperature? (per Sec-I, why is it above 425°C and per B31.1, it is 315°C)? I am in need of a technical reason for it. Also, does it have any hidden meaning that the temperature of furnace and the item that is to be stress relieved in...

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