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No x-rays on file however we are thinking about x-raying these welds. One of my colleagues just brought caustic stress corrosion cracking of carbon steel to my attention this afternoon. I had never heard of SCC in carbon but after researching it seems like what we may be seeing. The mill does...

Yes. Welder was qualified per ASME Section IX using a qualified WPS. The customer requested design conditions of 200 psi. @ 400F when the unit was built. I think there was talk about changing the use of the header in the future. It's being significantly under used for what it's designed for...

All very good points. Thank you. In the process of excavating (1) transverse crack on an 8" o-let to header weld we discovered a circumferential crack near the root and started chasing it. That revealed multiple small transverse cracks starting at the root and propagating outward toward the...

On one of the 8" o-lets the cracking is perpendicular to the SS line. On the other, there are (3) transverse cracks equally spaced around the circumference of the 8" o-let to RFWN flange weld on the header. No results on the chemical analysis for the weld metal yet. The engineer who designed...

Thickness is 0.375” No fluctuating or reversing loads. It is a very stable, slow system. Both of the 8” outlets for kiln steam have approximately a 15’ vertical run then transitioning into long horizontal runs to the kilns. A couple of things I’m a little concerned with are 1) The kiln steam...

Hello everyone, I'm having a problem with transverse cracks in carbon steel welds on a low pressure steam header for a sawmill drying kiln operation. The header is 20" STD SA-106 Gr. B with 20x20x10 WPB reducing tee's on either end for 10" dirt legs and a 20" WPB pipe cap on either end. The...

Thanks metengr

I don't know 100% for certain that the areas were prepped prior to hardness testing. I do know that the shop has a portable hardness testing procedure - weather or not it was properly followed I do not know and I don't have the part in my possession at this time. If the decarburized zone were...

It's been my experience that typically o-let manufacturers provide a "weld line" on the fittings, especially the larger ones, which is usually the first transition point in the bevel of the fitting. When installing the fitting the welder fits and tacks the o-let into place on the run pipe and...

Experts, We recently completed welded repairs to an A-217 Gr. WC6 cast part for a high pressure boiler main steam application. To make a long story short, our PWHT contractor inadvertently ran the part through the wrong heat treatment cycle with a batch of other parts. The part should have...

SnTMan, This is exactly what we have found. The customer supplied tubes (for use in a Sec. VIII, Div. 1 vessel repair) are marked and supplied with an MTR as being dual rated SA-249 / SB-676 N08367. We will proceed and document as SB-676. Thanks, numberfive

Thanks

Plugging of tubes in fire tube boilers should never be done unless the plugs are secured with a "calculated" strength weld. Tapered tube plugs simply driven into the ends of the tubes can fail and be ejected with deadly force. I have seen a couple of procedures from boiler manufacturers that...

Experts, I cannot find stress values for SA-249 UNS N08367 in Section II Part D. Am I just overlooking them or are they really not there? I have found them for SB-676 UNS N08367. Thanks in advance, numberfive

metengr, Thank you for the guidance. numberfive

metengr, I do have an MTR for the plate that we will be using for the PQR - no Cu, Ni, or V values supplied. The plate was clearly marked upon receipt with all of the Section II required markings traceable to the manufacturer's test report. I am fully confident that the material for the PQR...

Experts, I am in the process of qualifying a temper bead welding procedure in accordance with Section IX QW-290 for P5A material. One of the essential variables (QW-403.26) is an increase in the carbon equivalent of the base material using the equation: CE = C + (Mn/6) + (Cr + Mo + V / 5) +...

Experts, We are currently installing a stainless steel cooling water system for a condenser consisting of 8" thru 20" sch. 10 pipe. All flanged joints are ductile iron backup flanges and gaskets are a compressed aramid fiber with nitrile binder. At initial pressurization of the system (50psi.)...

Experts, Can anyone tell me what the difference is between API 5L Gr.X42 and API 5L Gr.X42R? Is there a difference? Our project specs out API 5L PSL-2 Gr.X42 - this is what we ordered. What we received is marked Gr.X42R - the MTR also refers to Gr.X42R. I'm looking in API Spec. 5L and can't...

Leakage is occurring between the threaded ferrules and the tube ends. There has been no seal welding performed. I would agree that removing the existing ferrules, cleaning and installing new ones (properly lubricated) is the best option. Thanks for the input! numberfive