The major issues when welding duplex stainless steels are the following:
1. Target ferrite %
2. Maximum heat input
3. Cooling rate

While we perform the welding procedure qualification for duplex stainless steels, it is required to use the same class of duplex stainless steel which is actually ...

Have there been any protocols /procedures defined within the site level to have an inspection & maintenance of gaskets.
Not for everything in all services but some critical flammable /toxic services?
I need inputs for new installations and for the ones already in operation.

Within the Welding Cost & Economy module, it is recommended to have latest entries from the welding consumable suppliers. Though they have to be regularly updated, however, was thinking if getting connected to the internet, once the values are updated, WeldPulse updates itself with those new rates ...

Please share any good resource, book to use as a reference to perform & audit the maintenance practices of static equipment in Oil & Gas sites.

API 571 details almost all those services & materials where in-service welding is required to be defined.
Check out your case if it falls with the requirements stipulated and if not, then your failures may have been the result of construction flaws.
This is for sure that a lot many services in ...

Apply 149 C preheat
ER80S-D2
E7018-A2
Maintain 316 C interpass, max.
704-760 C post weld heat treatment following ASME B31.3 for t > 13 mm or material with TS > 71 ksi. Apply that for 1 hour per 25 mm thickness with minimum holding time of 2 hours.
Hardness should remain at 225 BHN.

Suggested filler is ERNiCr-3:
ASME Sec. II C says as follows:
A7.4.1 ERNiCr-3. The nominal composition (wt %) of filler metal of this classification is 72 Ni, 20 Cr, 3 Mn, and 2.5
Nb plus Ta. Filler metal of this classification is used for welding nickel-chromium-iron alloy (ASTM B163, B166, B167 ...

Attaching some reference from the same document.
Carbon & alloy steels: Stainless steels: Copper-Ni:

PetroStreet's own guideline document from API 582 would be a very good reference on the subject.

neo, thanks, need some one to move to the next lesson learnt analysis.


ben, I could get a document on the incident from National Transportation Safety Board.
Attaching here.


I picked up the incident happened in Bloomfield Compressor Station, New Mexico.
The lessons which I could capture from ...