It is interesting to note that the reduction ratio in allowable stress for seamless vs. welded pipe, in this case from 18,800 to 16,000 psi, is 0.85. This is same efficiency value given for spot xray inspection vs, 100% x-ray which is given an efficiency of 1.0 per table UW-12.
It is...
Given the scarcity of SEAMLESS pipe in 304-304L 16-inch sch.80, the question I have is: IF the longitudinal weld applied at the mill on WELDED pipe is given 100% x-ray inspection successfully, then can the allowable stress on the welded pipe be raised to ASME code value of 18,000 psi as in...
This is to question the practicality of using a “seated” 2-way proportional hydraulic valve in pressure control (reducing) pneumatic service. Without any direct experience in seated valves, it is my understanding that, when closed, the poppet is seated against a polymeric or other soft material...
We're planning construction of a non-code pressure vessel for REMOTE testing of reactive chemistry. (OK, explosions). Nevertheless, I refer to the BPV code for guidance in welding and optimizing the strength of this reusable vessel. It consists simply of a 36 in OD pipe x 0.6 wall alloy API...
Thanks again, metengr
I was laboring under the apparent mis-conception that a heat treat could be done after the welding of dissimilar metals to compensate for the effects of weld heat in the 4130 parent metal if it were soft to start with.
It looks like I should prepare a sample welded coupon...
I am looking for a specification or suggested procedure to cover a welding process joining a 316 SS pipe cap to a 4130 outer ring with a butt and/or fillet weld joint. Post weld, I would like to increase the yield strength of the 4130 by heat treatment. I seek any guidance for a heat treat...
