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We are doing weld, cool to 200F, followed by bake out. PWHT the next day. Thanks for all the help.

Thanks for the quick response. So you do not see any harm from not cooling to 200F after welding as long as the Ni+Mn content of the filler is below 1.2%? Conversely, if we still cool to 200F after welding, what is my risk of fracture? and would this fracture of the weld show up during the...

Hi All, The 2015 Epri best practice guideline for P91 (2nd edition) has removed the recommendation for cooling the weld down to 200F after welding and before bake out (as compare to first edition issued in 2011). It has tied the requirement to the nickel + manganese content of the filler. If it...

Hi Everyone, I have read a lot about P91 on this website and have benefited tremendously. I do have just one more area I like to get some clarification: For field welding (following the recommendations from ASME B31.1), when I insert the bake out process in between welding and PWHT, do I cool...

We already have the PTO. Contractor is the one asking those questions.

Thanks for the answer. The rental unit came with the first stop check. Due to the fact that the rental unit is tied in to a common header with another boiler, a second stop valve is required. We put in the second stop valve with a spool and drain in between. This spool piece is now considered...

Hi All, I have a few questions I am looking for some advice regarding the installation of a temporary rental boiler: 1. Does the code give any allowance for hydro of Boiler external piping for a temporary installation? The boiler external piping is a spool piece of about 1'-6" long with a...

Hi MJC, Thanks for the input. Would you mind explaining why it would be considered as a bad practice? Thanks.

Thanks... But back to my original question. Is the dissimilar metal acceptable?

CS are good till 700F per B31.1 I thought?

Situation is as follow and would appreciate some advice: Existing pipe was originally designed for >1000F operation and material is P22. After some modification to the system, the new operating condition is reduced to 500F@450psi. Now if I need to add a branch to this system, would it be...

Hi All, I have a following scenario I would like some technical help. Utility boiler with feedwater pump HP discharge side water hammer. There are one inlet and two discharge (HP and IP) for this FW pump. HP side has no check valve after pump, but has ARC valve for recirc to drum. Whenever...