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Stanweld, I mean cellulosic rods used from the root pass right through to the cap. Why can they do this in NG piping and not process or power piping. If I misunderstood you please elaborate. Thanks Sftyvlv

Why can cellulosic electrodes (root,fill and cap) be used on natural gas transmission lines and not used in process or power piping. Why one and not the other. Hydrogen embrittlement comes to mind.....must be something else? Sftyvlv

What are the advantages or disadvantages of both? Why not just use socket weld flange for everything? Sftyvlv

currently we are using an F4 SMAW (root,fill and cap)procedure on a job welding a335 p11 5 inch double extra heavy skid piping for a reheat furnace. Our welders are having trouble rooting this v groove joint and I'm wondering if using an approved procedure using aws 8010 as a root pass might be...

To All: I'm very sorry, I did not intend to argue this question, your expertise is highly valued and I do not mean to upset anyone. I have seen "air pig" style manifolds from a manufacturer with a "U" stamp and tag verifying the specifications I first listed. I assumed a "backyard" manifold...

Duwe6, I am aware of this and that the poorest weld may infact hold indefinately. My point being that this vessel was not constructed to code and if in fact it need be whats to stop anyone else from fabricating whatever they want with whatever material they want and weld it anyway they want. The...

This vessel would be your typical "air pig" style receiver/manifold and yes it was constructed of 6" or larger pipe and yes I believe it carried over 100 psi compressed air. It's connection to plant air is from compressed air hose and "chicago" type coupler. I see this all the time in many...

Hi folks: I've seen this before but hadn't thought much about it because nobody seems to care. Having said that, on several occasions I've seen in use a compressed air manifold with a receiver, with 8 outlets on it or so. Upon further investigation, noticed no construction tag on it and nothing...

We are doing this procedure for our mechanical contractor. Currently we maybe using it under B31.1 in a high temp high pressure steam application. Thanks Sftyvlv

My QC and I are developing a PQR/WPS to weld the afformentioned what do you recommend? GTAW root, SMAW fill/cap Thanks Sftyvlv

On welding pipe made with this material, what would should my interpass temperature be? sftyvlv

vesselfab I believe you are correct, it is a312-tp304. thanks Sftyvlv

Sorry Metengr, what I ment to say was A304 pipe. I thought a312 was the material group and covered a304 (304 being the grade). Thanks Sftyvlv

Where can I find transition temps for a312 in the code books. I'm just starting as a level 1 welding inspector,QC (Canada) and just learning. Thanks Sftyvlv

On a recent post I mentioned a condensor line that was Rt'd instead of a hydro (because the line could not be isolated). My question is could any other form of ndt been done. This line did not meet the requirements of Rt under B31.1. In the previous post I was asked if the customer had...

Yes this is to B31.1 Sftyvlv

I have a 20"condensate line that terminates in the main condensor of a 500mw steam turbine. The pipe is A106 sch 40 20". The wps calls for a gtaw root pass with Er70s-2 wire and smaw 7018 root, fill and cap. The service temp and pressure are 50 psig and 350 deg F. A hydrostatic test was...

Why does the code not allow corner joints in boiler pressure vessel construction? Specifically in firebox firetube boilers. sftyvlv

What is the min allowable pipe to fitting engagement for a socket weld? Thanks Sftyvlv

Thanks, for the info. I'm new at metalurgy and I've hardly scratched the surface on the wide variety of topics that relate to this field. I'm a red seal pipewelder in Ontario,working at a coal fired power station,and am curious to the "hows" and "whys" of welding metallurgy. I have ASME section...