Steam leaks on pipe flanges is a common problem at our facility. Often the leaks can only be addressed during an annual maintenance outage. Usually by that time the flange face has been "cut" by the steam.
We have repaired these defects by mechanical removal (grinding, PT the excavation...
Hi,
I would like to use ASME PCC-2 as a repair guideline for B31.1 piping systems. However I cannot find a reference to it in B31.1. It is not listed as an adopted standard in my jusrisdiction (British Columbia, Canada). Does that mean I can't use it?
What governs PWHT requirements for P-No. 4 Materials? We are replacing flanges and a section of pipe on a 10" diameter steam line. The pipe is Sch 40 (0.365" wall) A335 P11 (P-No. 4 material). The piping is Non Boiler External Piping B31.1. However our weld procedure states that any pipe...
Trouble interpreting ASME Sec IX QW-200.4
I want to make sure I understand this paragraph properly. I have an approved WPS for GTAW of SS piping and a WPS for SMAW of SS piping. If I wanted to produce a SS weld with GTAW root and SMAW hot pass/fill and cap I can do so using a combination of...
I have a set of 10" WNRF 600# flanges on an superheated steam line (765 deg F service temp) that need to be replaced The existing pipe is A335 Gr. P1 Sch 40 (P No. 3, 1/2Mo, no Chrome). The flanges are A182 F11 (P No. 4, 1-1/4Cr, 1/2Mo). There was no PWHT on the original welds nor do we plan...
I'm confused over the allowable surface porosity for girth welds in all fluid services.
Table 341.3.2A states that the extent of imperfection allowed is zero, however it also refers to Note 5 (These imperfections are evaluated for welds less than or equal to 3/16" in nominal thickness).
Does...
I'm confused over the requirements for pressure gauges that are to be used for hydrotesting pressure piping manufactured to either B31.1 or B31.3.
Neither B31.1 or B31.3 state any requirements for gauge calibration or gauge ranges (at least that I can find, maybe I'm wrong). Nor can I find...
If a welder is qualified to:
Procedure 1
SMAW
P1 to P1
E6010 root, E7018 fill and cap
Procedure 2
GTAW
P8 to P8
ER316L filler
Would that automatically qualify him for
Procedure 3
GTAW/SMAW
P1 to P1
ER70S root, E7018 fill and cap
We are replacing a manway insert on a 40 year old carbon steel API 650 storage tank. The tank has been used as a White Liquor (Caustic) Storage tank.
I'm concerned the inner shell to insert weld will fail due to caustic embrittlement of the shell material. Any suggestions as how to avoid this?
Hi,
I'm trying to design a work table for our shop using 4x4x1/2" and 5x5x3/8" HSS members for legs. The legs are to be adjustable in height with the smaller HSS "nesting" in the larger. The table height is to be adjusted using the nested HSS and inserting a pin through the two members.
I...
