H1 reduction Factor

While Design a tank At A temperature of 230deg C, I am getting one factor Called as H1 Reduction coefficient.

This factor could not be located in API 650 or 653

Can somebody guide me on this?

Rajesh

Hello Rajesh

At elevated temperatures, the design stress is reduced by a reduction factor. You can find the details in API 650 Appendix M.

Thanks Ray for your reply,

But calculations show two factors one as Yield Strength Reduction as per Table-M1

And

H1 reduction factor due to temperature

Are both used for calculations

Rajesh

Hello Rajesh

The reduction factor is for the tank shell, and also for other components, such at intermediate wind girder(s) etc.

Please refer to Appendices M.6, S.3.6.7 for stainless steel and X.3.7.5 for Duplex Steel.

Thanks. It is for M.6