Recent content by engrpiper

Is it a requirement for a weld repair on piping to have the supplier submit an MTR for a pipe fitting that is stamped with the material and grade?

Ok, thanks. It would be B31.1. Got any leads on old code books?

I looking for old stress values. Anyone know where I can obtain the pre 1978 stress tables? Thanks for your replies!

During construction of a new power plant it was observed that a section of "new" pipe was extremely pitted (after being welded in, only the outside surface has been inspected). We understand that it was at the mill for three years and then shipped to the construction site. The AE is claiming...

Let me catch up. BigInch Yes - a stress model has been completed and three new hangers are being installed. The original design (30 years old) had a rigid rod on top of an elbow that wanted to lift up. Someone at the plant saw the bent rod and determined that a new "bigger - better" rod (2"...

Material: A335 P11 Weldolet with threaded TW Service: steam 300psig 835F The TW is redundant. The fillet weld on the weldolet to pipe cracked. After removing the weldolet dye penetrant showed cracks extending out into the 10" pipe. Cutting a 5.5" hole will remove these cracks. I am planning...

Can you weld a 6" sch40 pipe cap over a hole (removed thermowell) in a 10" Sch40 pipe. Area reinforcement for a branch connection per B31.1 is provided without adding a reinforcement pad. Is a branch spool piece required between the 10" pipe and the 6" cap? Thanks for your replies!

Hey all, I am looking to see if there are simple options to monitor online strain, strain rate, deflection or swelling. I have a steam pipe that was deformed by an impact. Most of the pipe was replaced but a small section that was away from the impact has to stay online for a few years. I...

I2I, Thanks for your reply. I am familar with the B31.1 reaction forces calc. I am looking to understand the revisions for the relief capacity calc. The new "identical" valve has ~20% increase in capacity. The argument being made is "this is not a rerate to the drum, the valve has always...

I am told that the relief calculation changed in 1978. I have been asked to investigate this due to that fact that a safety on a boiler steam drum needs to be replace in the furture. The vendor's quote for an identical replacement valve at the original design inlet conditions now has an...

I assume it is Section I however I am not sure. Were is the relief capacity calculated to take the reaction forces back to the steam drum?

Section I

I am told that the relief calc in sect VIII changed in 1978. I have been asked to investigate this due to that fact that a safety on a boiler steam drum needs to be replace in the furture. The vendor's quote for an identical replacement valve at the original design inlet conditions now has an...

Thanks for your reply. Tube Turns is not what they used to be. The facilities are owned by Sypris, http://www.sypris.com/. This is a large diameter pipe 35" but I am told it only has a weld on the outside "Back Bone". I am curious to how it was fabricated or if someone is missing the inside...

Would anyone in the group be able to point me to fabrication methods for 1.5D elbows, forgings and welded. I have heard that a elbow can be fabricated from plate steel and have one weld on the extrados. I would greatly appreciate any information. Thanks!