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Thank you both very much for your response. Yes, we will have 50% caustic solution with a limit on our design temperature to allow for the use of carbon steel. All our lines will be PWHT'd as well.

Hello, Is SMAW an acceptable welding process for caustic piping? Will the slag on the ID affect the corrosion resistance of carbon steel in caustic service or will the effect be negligible? Thanks in advance.

Hello, We have put out a few requests for quotation and Ni-resist was specified for the pump impellers. We have received some feedback from vendors that Ni-resist is no longer widely fabricated due to machining difficulties and 410 has been offered to us instead. Is this a true statement? Is...

Thank you Pud and CoryPad for your suggestions. I will look into them.

Hello, What would be the best technique for welding heavy wall HDPE pipe sections together? Our pipe will be 20" diameter and 3" thick. In the past we have used hot plates for smaller and thinner wall pipe, but I am pretty sure this will not be adequate for 3" thickness. Thanks...I appreciate...

metengr, Thank you very much for your reply. It makes sense to me that a 1" thick weld procedure is required, but the vendor is fighting me on this so I needed a second opinion. I appreciate your sound advice, as always.

Hello, I have a weld map which shows 1" deep plug welds. The vendor changed the welding symbol from a plug weld to a fillet welds since he claims that the plug weld was done with a fillet weld fill procedure (I don't know what this means). My questions are: Are plug welds considered to be full...

Hello, API 600 CN 9 (Trim 9) just states NiCu alloy. Does this mean Monel 400 or does this mean any combination of nickel and copper? I did not see reference to Monel anywhere in API 600 (the older copies of API 600 used to say Monel). Also, I received a corrosion resistant weld overlay weld...

You need liquid water to have wet H2S corrosion. The reactor outlets do not contain saturated water which could condense and form droplets of water. If the humidity of the line is less than 100% (or a lower number depending on your safety margin) there shouldn't be liquid water and hence no...

Thank you everyone for your responses. This is for a liquid ring vacuum pump for a petroleum plant. Oddly, the process fluid is recycle water (I thought non-sparking would only be required for petroleum products).

Mr168, Thank you for your response. The pumps were requested to have all non-sparking materials for the process-wetted components. The rotor and casing were specified to be ductile iron and the shaft to be 1045 steel. The vendor came back with A 216 (WCB) rotor and A 105 casing with 17-4 PH...

Hello, I have also posted this in the Pump engineering forum. Would somebody be able to tell me if ductile iron and stainless steels are considered to be "non-sparking" materials? Our pump data sheet calls for non-sparking materials but the listed materials are A 536 (ductile iron) and 17-4 PH...

Hello, Would somebody be able to tell me if ductile iron and stainless steels are considered to be "non-sparking" materials? Our data sheet calls for non-sparking materials but the listed materials are A 536 (ductile iron) and 17-4 PH stainless steel. I appreciate any help you can provide!

Steve, Thank you very much for your advice. I will insist that the internal components comply with NACE.

Hello, I was wondering if the NACE MR0175 requirements are for pressure boundaries only or are internals applicable as well? We are purchasing a compressor for a gas stream that contains CO2 and H2S. There will be no water drop out in the compressor, but NACE MR0175 requirements were requested...

Thank you very much everyone for your valuable responses. I really appreciate this information!

Hello, I have found conflicting information regarding the use of Viton in sour service. Does anyone have experience with Viton in sour service and is there a H2S limit for Viton? Thanks!

Thank you very much rustbuster and metengr for your responses. Sorry, got my details wrong - the head is cold formed then re-normalized at 1650F. metengr, UG-85 takes me back to UG-93(b) where it states that a supplementary MTR or a certificate of compliance is required. The AI "shall...

If a fabricator will hot form a head at 1650F (SA 516-70N), is a new MTR required? They are essentially re-normalizing the material. Is ASME VIII UG-93(b) applicable in this case? If a certificate of compliance is issued, do they need to issue support documents (i.e. tensiles, impact tests...

Thanks GRoberts for your reply! I looked up B31.3 and the code allows it as long as the weld procedure was qualified with the consumable insert.