Hello everyone,
Has anyone checked a B16.5 RFWN flange against VIII-1 App. 2 and had it pass at a pressure much higher than what B16.5 permits?
We have an NPS 6, Sch 80, A105, RFWN with A193 B7 bolts and a gasket with m=3 and y=9,000. Per B16.5, this is rated for up to 285 psig. Using App...
In B31.3 345.2.3 (b) Flanged Joints it says:
"Flanged joints used to connect piping components and subassemblies that have previously been tested, and flanged joints at which a blank or blind is used to isolate equipment or other piping during a test, need not be leak tested in accordance with...
For an open pool fire on a vertical, uninsulated, air-filled vessel do you include the full area of the top head (ellipsoidal) when determining the unwetted surface area? It's at ground level and is less than 25' tall. I have a few different sized vessels between 8' to 12' diameter.
Since the...
PG-71.5 of ASME I says:
"When a boiler is fitted with two or more pressure relief valves on one connection, this connection to the boiler shall have a cross-sectional area not less than the combined areas of inlet connections of all the pressure relief valves with which it connects and shall...
I have two openings close enough together that their limits of reinforcement overlap. One of the nozzles (N1) is a forged HB type and has sufficient reinforcement in the area A2 to pass. The other nozzle (N2) needs A1 and A2 reinforcement to pass.
Am I able to "ignore" the A1 area for N1...
We are looking to modify a pressure vessel so that it has a finished opening 1 7/8" diameter in a 3/8" plate. A pad is placed on the inside of the shell and is threaded in place by a threaded flex hose hooked up to the nozzle. The opening will not be near any discontinuities or welded joints...
I've been told that the PSV capacity calculations from Section I changed at some point from 10*(Heating Surface Area) to (Boiler output in Btu/hr)/1000 as it's now written in PG-67.2.1.4.
Does anyone know at about what edition that change occurred?
Apologies for another UW-11(a)(5)(-b) post. All the threads on this website and other documentation I've read (such as Pastor's Pressure Points Newsletter) haven't quite covered my situation though.
I am reviewing the design of an existing VIII-1 vessel from the 2001 ed. It has the following...
What PSV Sizing software do most people use and what are your comments on it?
We currently use Farris SizeMaster but are looking to upgrade to a program with more capabilities (modify discharge coefficients, backpressure calculations with multiple relieving valves, etc.) We often do PSV sizing...
Hello,
What is the correct way to determine if a discharge header has sufficient area for multiple relieving PSVs? This assumes negligible back pressure (i.e. short piping length venting to atmosphere).
Example, two PSVs with NPT 2.5 outlets combine into a single discharge header.
Option 1...
I'll use B31.1-2016 as the example, but my question applies to B31.3 as well.
The start of the creep range in App. A is the temperature before the first italicized stress value. e.g. for A-106B the creep range starts at 650F.
Note 7 in Table 102.4.7 exempts carbon steels from the requirements...
Does anyone have a copy of a 2:1 ellipsoidal head forming table that they can upload? I'm referring to a table that tells you what the minimum forming thickness is expected to be based on plate thickness and diameter. I have a table already, but it was an old faxed copy so some of the values...
A vessel overpressured and blew out a gasket. I am attempting to determine what minimum pressure the vessel must have seen using the formulas in Div 1 App 2.
To determine Wm1, do I use the total area of bolts, or just one bolt since each bolt is torqued individually?
If I have a flange...
Hello, we are trying to register the design of a threaded fitting similar to a B16.11 bushing, except that the inner NPT 1/4 threading faces the opposite direction.
We have three sizes 1/2", 3/4", and 1". I can prove that the two largest sizes have enough thickness between the threads that...
We have a low temp vessel where the MDMT was determined by impact testing (i.e. was not exempted in Figure UCS-66) to -50F. If we want to reduce the MDMT to a lower temperature (say -60F), are we able to use the reduction from the stress ratio in Figure UCS-66.1 without doing any further impact...
An ILI found dents >6% deep near 3 of our underground guides in a double S-bend riser for an NPS 6 pipeline. The dents are located at the 6 o'clock position. Verification digs will be performed in a few months, but we are thinking it is either caused by rocks (not likely to have caused all 3...
I am doing calculations on a fitting in ASME VIII.
If I have a Curve C, P1 Gr. 2 material that is 4" thick, the MDMT per Fig UCS-66 is 52F. When I go to calculate the ratio in Figure UCS-66.1, it comes out to be less than 0.35.
As per UCS-66(b)(3), this component is impact test exempt if the...
My colleague is trying to do a 10" blind and flange repair at the end of a header in a Sec 1 boiler. They don't have access to the outside of the flange and were wondering if they can machine the pipe/flange so that a full pen butt weld is done from the inside of the pipe. I couldn't think of...
What references does everyone use for weld strength calculations? Namely in Canada?
I use CSA S16, but Section 13 doesn't cover all configurations possible.
