A 400 HP boiler steam outlet connection.  A pipe connection of 6" diameter with a pressure of 150 psi and 366 F.  I am trying to find out if sch 40 will be resist the pressure it will be given or should it be switched to a sch 80/Check Valves.

without knowing the details, i highly recommend using the ASME Boiler Pressure Vessel Code be used to determine suitable nozzle requirements for boiler. i trust the ASME code does apply in this matter.

Refer to Section 104 in ASME B31.1 for the equations for calculating your minimum wall thickness for 'Boiler External Piping.' You'll also need to know if you have any design conditions that exceed what you stated above, corrosion allowance and of course your pipe material. You'll get your allowable stresses from the tables in the back for your specific pipe material. It's easy.

You get your allowable stress from Appendix A, Table A-1 in the back of ASME B31.1. If you have welded pipe, make sure you select the values for the correct class of pipe that you have. I forgot to mention earlier, you need to consider mill tolerance as well.

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