Trying to find the maximum allowed radial clearance between vessel hole and nozzle outside diameter. Ie, the max gap between the drum shell and a nozzle welded with a combination groove/fillet welds from both sides.
I did find a requirement in PW.16.6 that refers to figure PW.16.1 (AA) which is...
I am studying ASME Sect IX. Probably a dumb question here but QW 171.1 reads "toughness tests shall be made when required by referencing codes...."
My career has been mostly limited to the ASME Sect 1 and B31.1 code. I cant say as I have ever ran across a specific instance where it was required...
Trying to figure out the essential variable "A"# for E7010-P1. Ive compared the analysis from both the spec in sect 2 (SFA.5.5) and from a sample test report from Lincoln (pipeliner 7p+) and the analysis doesnt fit any A number on the table. The nickel(1.00max sect 2, typ 0.58-0.90 from the mfr)...
Reviewing uptated 2021 sect I mandatory appendix VIII I cannot not find the HB calc for preheating/postheating. Previous editions used 6T. SB is addressed in all areas (SB/HB/GCB) and HB regarding PWHT.
I am working on a procedure to repair a branch connection of an extruded nozzle connection off a manifold to a feeder pipe.
Header pipe A53 B. Feeder connections were once SA209-T1a and have at some point been switched out to T22. The failure is some distance away from the header into the...
Ive been tasked with reviewing a boiler repair performed several years ago by a well established vendor.
Replacing several boiler tubes in several different boiler sections. Header/tube material garden variety 10" sch 120 SA 106 B/ 2" 120mw SA 178A. Nothing special about this configuration...
I have a client requesting that I confirm our vendor can comply with the following requirement:
"Mild carbon steel filler metals with ASME Section II Part C composition ranges that can extend beyond the ASME Section IX Table QW-442 A-1 chemistry limits (i.e. ER70S-6, E7XT-1, etc.) must be...
We are building several carbon steel tube panels (upper/lower header joined with boiler tubes) and the client is asking for final hardness testing. Nothing special about the project. ASME Sect I. Header pipe SA 106C, sa 51670 end plates and SA 192 finned tubes. PWHT per pw.39 for P1 materials
I...
I am assisting with a grade 91 tube leak on an older HRSG built in the late 90's. T-91 tube, grade 91 header. Failure at the toe of the weld. Failure cause and weld repair process understood.
The repair tube stub is cold bent. A PG-20 strain calc steers us into heat treatment of the bend after...
Have some down time and researching PWHT hold time for matching grade 91. The majority of what I have read (prior to April 2015 EPRI report Guidelines and Specifications for High-ReliabilityFossil Power Plants, 2nd Edition) lists lengthy PWHT hold times of 2 hours and beyond.
Some recent...
Looking for an out for heat treatment. Not to save a buck...theres just no room.
Original ASME Sect 1. Wanting to cut a hole in a 1" thick 2.25cr header large enough to reach in to install a plug inside the header (plugging a tube from the inside). Will do this on both upper and lower header...
I have a spool section of 6" 2.25 cr pipe with a non pressure part welded to a pressure part (in the shop, under an S stamp) being sent out to the field for installation in an existing boiler that has been running for years. (NBIC applys)
Its simply a fillet welded donut welded inside a pipe...
I noticed in the 2017 edition the minimum temp for PWHT of P15 E materials has been lowered from 1350 to 1300.
Does this indicate a trend that lowering PWHT temp is desirable for 15E materials? It would seem by doing so it would effect hardness numbers somewhat. Just wondering what was driving...
Reference the diagram ASME PG-58.3.1 (A) " Code jurisdictional limits for piping" - Drum type boilers.
Solid bold line indicates " Boiler external piping and Joint"
What exactly is meant by " ASME Section Committee b3.1 has been assigned technical responsibility"?
I have always perceived this...
ASME Sect 1 PG.20 gives specific direction for cold bending T-91 (bending below 1300f). The listed temperature ranges " post cold forming strain limits and heat treating requirements" detailing heat treatment/ begin at 1000f design temp ( the lower temp range).
What if the design temp is below...
In a jam. Existing 1.5" .135 t-23 welded to t-91 ( a stub) welded to heavy wall 2.25 cr upper header.
Every tube across panel. Forced outage.
Doing it by the book. Well versed in the specifics. Electrical resistance preheating is a huge production hog. Doing it on the header as well as the...
I have a client asking me to research a 321ss to 9cr repair procedure. After doing my own research, I will also consult with a metalurgist as well as a selected weld engineer and compare notes.
A crack was found in a fairly heavy 1.5" thk. x 12"-16" long 321 stainless lug welded to a 9cr pad...
In process of writing a spec for welding 9cr-2.25cr. Section 1 HRSG Superheater. MAWP about 2500psi, steam temp about 900f. Field install.
The header itself is going to be 9cr. (header pipe, endplates, nozzle, etc). There will be 2" od 2.25cr stubs welded to the 9cr header to transition into...
Does anyone see any harm being done having PWHT performed on 6" sch 80 2.25cr (.432 thk P5a) piping even though it is not required by code?
Shop environment.
Asme sect 1 pressure vessel. Unit has been in service for several years.
Simple bracket made out of 1/4" thk CS plate welded directly to the O.D. of a 10" sch 120 1.25cr pipe. 3/8" fillet weld. 10" sch 120 pipe is .844 thk. (above 5/8")
ASME Sect 1 for P4 materials. I read this joint...
