I would like to know if a ASME VIII Div.2 vessel shop hydrotested at about 5000 psig and approved by the AI outside the US can be subjected to a rehydrotest in the field as part of the associated piping system circuit. The field piping joints are directly buttwelded onto the vessel nozzles and...
We have a major repair to be undertaken under NBIC to reweld the dished end to the shell of a ASME div.2 stamped HX in the field. The joints to be repair welded in the field are 6" and 3" in thickness. The HX has a design of 3000 psig. The original code of construction required a shell side and...
I would like to know if there are any restrictions in the ASME codes or industry practices to not use lubricants containing copper in ammonia piping systems or service facilities. Is there a potential for any corrosion or cracking due to usage of copper containing lubricants at flange joints?
We encountered a weld failure between an ellipsoidal head and the tubesheet material in the field even before the equipment had been started up. The head in the new HX equipment was over 3 inch thick and had gone through all necessary preheat, NDE, PWHT, hydros etc in an overseas shop with no...
Our supplier intends to fabricate a P11 dish head with dimensions of 3000 mm ID dia and 120mm thick using crown and petal design. The vessel is in ammonia service.The supplier plans to use four petals that will be manufactured by coldforming without any postforming heat treatment, weld them up...
We are to construct an ammonia plant piping to B31.3. Are there any specific code requirements for 100% NDT and PWHT to ensure there us no stress corrosion cracking issues. Is ammonia classified as A category M fluid service? Thanks.
Our supplier is fabricating a ASME vessel in critical service using 2:1 elliptical head of P11 material. They intend to use the crown and petal design to fabricate this. Is there any limitation to use this design per ASME code? What is the recommended design for head fabrication? Appreciate your...
We received and installed a pressure vessel at one of our sites in South Korea. The vessel was not registered with the National Board by the OEM. We have requested that the vessel be registered. The nameplate will now need to be updated to include the NB number. I would like to know the...
How critical is hot cracking in G4852 Micro R steel.Is it beneficial to perform PT of the rootpass or hotpass to ensure no defects in the weld initial passes? Are there other NDT methods that can be used for detecting hot cracks?
We have ASME stamped vessels built to Sec VIII Div.1 that now need some additional insulation rings to be welded to support the insulation weight at the non pressure part of the vessel(bottom skirt). The contractor mobilized to set the equipment only has AWS D1.1 certified welders. Do the...
We had numerous damages occur to the tubes in the tube bundle assembly in a new heat exchanger fabricated at our suppliers shop during assembly of the shell miters. The supplier told us that he will replace the damaged tubes based on a visual inspection and reuse the acceptable tubes that can be...
We have ASTM B705 N06625 and B366 N06625 in process modules that need to be welded. The tensile strength of the N06625 grade 1 material is 120 ksi. Please recommend what type of weld rod/filler metal should be used to weld the N06625 grade 1 material.
We have shop fabricated waste heat boiler and steam drum that are to be field assembled. The risers are to be welded in the field for completing the installation of the steam drum on the boiler. Is a hydrotest mandatory for the complete field assembly for the tie in welds even after shop...
We are experiencing frequent failures in the 1st stage diaphragm of compressor since being put into operation last year. The material spec states that it is made of Inconel 718 material. The in situ hardness measured was HRC 34 as against HRC 36. Can a marginally low hardness of the diaphragm...
We are seeing repeated failures near the toe of the SS nozzle weld in Stainless snubber vessels in hydrogen service lately. The vessel shell is SS 316H while the small bore nozzle material is 1" SS 316L schedule 40S as in the data report. The nozzle is only about 6-8" long. The recent crack is...
Our supplier had a heat treated carbon steel heat exchanger that was in a storage yard and something caused a dent in the shell there. The supplier is not able to tell us how or what happened, but it looks like maybe a trailer was backed into it. Anyway, there is now a dent in the shell about 9”...
We are erecting a owner supplied relocated gas turbine and its used air inlet duct at a new project site. While the Owner wants us to blast and repaint the used duct that's now erected adjacent to the turbine he has brought up the concern that dust/particles left on inlet duct associated with...
We are erecting a owner supplied relocated gas turbine and its used air inlet duct at a new project site. While the Owner wants us to blast and repaint the used duct that's now erected adjacent to the turbine he has brought up the concern that dust/particles left on inlet duct associated with...
Hi
We are building a power project wherein the owner has supplied used control, manual and relief valves from a decommissioned plant probably over 20 years old. As the installer what are the conditions and requirements that these Fuel gas valves have to meet before we can use them. Are there any...
I have a question on a suppliers shop test performed. The order called for a electric driven firewater pump with a 125 HP/1765 RPM motor to meet the design conditions. The supplier states that he used a 200HP/3500 RPM motor to test the pump in the shop and that it passed the performance test...
