I understand the BPVC has a specific statement regarding the acceptable use SA-312 for use in low temperature applications and no such statement is made in regards to SA-358....and I realize the A-358 spec identifies this material for high temperature and corrosive service, but the B31.3 code...
We are update our pneumatic testing procedures for B31.3 piping systems to better comply with ASME PCC-2 Article 5, section 6.2 - which is the best defined pneumatic testing procedure I have seen. However, the PSV setting recommendation for PCC-2 is different than ASME B31.3 345.5.2. The...
B31.3 has radiography requirements stated in Table A1-b as well as table 302.3.4 in order to increase the weld quality factor for seamed pipe. Do seamed fitting constructed to B16.9 also have to meet the radiography requirement of the longitudinal seam in order to achieve the weld quality factor...
Does anybody know why API STD 526 limits the pressure on some orifice/flange combinations. As an example, a 600#/150# 4X6 "L" orifice constructed out of carbon steel has a pressure limitation of 1,000 psig at 100 F (Table 10), though a 600#/150# 3X4 "K" at 100 F is rated at the full flange...
This question had probably been answered before, but I could not find it in the discussions. C172 seems to indicate that only one sample per truck (revolving drum)is required, but that sample must be made up from two portions, sampled no longer than 15 minutes apart. If this is the case, then...
We are moving a vessel to use in a different service (absorber to amine still). The vessel was built in 1965 using SA-212 B Firebox, but does not have a min. temperature stamped on the plate. I believe at that time, the code allowed -20F for this material. Since I am moving the vessel, I...
A question that seems to come up in our company quite a bit is whether or not to weld the circumferential welds when installing a split sleeve. It appears from the B31.8 Appendix I figures that a split T would require the circumferential welds, but the sleeve it is optional to weld. It would...
We have a situation where two vessels were made from a longer vessel. The original vessel was built in 1967 and was code stamped (we have the drawings). The vessel was cut in half and two vessel were constructed using new heads for each...both vessels were R stamped for the modification.
The...
B31.3 and ASME Section VIII indicates SA-105 material(for a flange, in this case) has a MDMT of -20 F. However, B31.3 allows for some materials to be used as low as -155 F without impact testing (Table 323.2.2, note 3) provided the stress ratio does not exceed 0.3. The service is propane...
I am looking for advice regarding the appropriate calculation method to find the maximum operating pressure we can allow when we perform a Hot Bolt procedure (ie, removing one bolt at a time for maintenace purposes). I can run the calculations using an ASME Section VII calculator (Mr...
I am trying to find out if there are some industry guidelines regarding relief system sizing and what the maximum velocity (% of sonic) one should design for. I realize API recommends tip velocities of around 500 ft/sec for proper dispersion, and that we want to stay below sonic velocity...
I recently ran across a threaded fitting for which I cannot find a specific ASME standard relative to the dimensional tolerances....and would like to see if any of y'all could provide some guidance.
The fitting is a "reducing coupling", this specific fitting is 2" to 1". Basically, it is a 2"...
It appears B31.3 allows the use of ASTM A325 bolts (although they are normally considered "structureal" bolts), but they are not listed in B16.5....
Are A325 bolts allowed in hydrocarbon service for flanges, assuming the allowable stress for the bolt is not exceeded for the service (the...
It appears B31.3 allows the use of ASTM A325 bolts (although they are normally considered "structureal" bolts), but they are not listed in B16.5....
Are A325 bolts allowed in hydrocarbon service for flanges, assuming the allowable stress for the bolt is not exceeded for the service (the...
We have a situation where it seems to make sense to repair non-code vessels (like cracked compressor bottles). In some cases, it may be a repair we make in order to keep our processes in-service until we can get a code vessel manufactured. In other cases, the repair may be permanent....although...
B31.3 restricts the use of cast/ductile iron piping and pipefittings, and I would assume this material restriction would include valves and reguators...is this a good assumption. I have looked into the engineering codes for a couple big companies and could not find any...
We currently allow o-lets when the branch is 2" and smaller (limited by 1/2 size of carrier pipe). We then require stub-ins w/reinfocing pads in the "intermediate" ratios (ie, hard to find reducing T's), and then reducing T's on the higher ratios (which are commonly available).
The problem is...
