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What considerations underlie the value of 0.6 in the ASME internal pressure formula and 0.5 in the national standards?

2016-08-17View Original

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The ASME formula for internal pressure is t=PR/(SE-0.6P), or SE=P(R+0.6t)/t. According to GB standards, δ = PDi/(2-Pc) = PR/(-0.5P), or σ = P(Di+δ)/2δ = P(R+0.5δ)/δ. The welding factor is not taken into account in these formulas; the structure of the formulas is similar, with the difference lying in the values 0.6 and 0.5. What is the basis for using 0.6 in the ASME formula?

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