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  1. JonD71

    Passivation of 316L in 98% H2SO4 service at ambient temps

    Thanks again uncylesyd Looks like we wont be boterhing to pasivate the line internally. Though have completed local passivation externally of welded joints. Regards JonD71 JonD 71 Australia
  2. JonD71

    High temp cracking in steam pipework

    Unclesyd Thanks for the prompt response. Cracking has been identified by a metalurgist as temperature related and is multi facited circumfernetially around the pipe. The water injection nozzles are present as this is the steam bypass line and spray marginally constantly to improve their...
  3. JonD71

    High temp cracking in steam pipework

    Hello all Am having trouble with high temperature cracking of a gas turbine steam dump line. The 600mm dia line is made of CrMo and C/S welded together, though cracking is evident circumferentially in both materials. Cooling water is injected into the pipe when in operation at around 40 degC...
  4. JonD71

    Passivation of 316L in 98% H2SO4 service at ambient temps

    Hello all Am currently replacing a 98% H2SO4 carbon steel line running at ambient temp around 40 deg C with 316L. The line is approximately 200 meters long and 250mm diameter. As such it has multiple welded joints. The question is do I need to passivate this line internally to give me...
  5. JonD71

    In service weld repairs at 400 deg C on 304H S/S

    Aybee Vessel is to Australian Standard AS1210 which is very similar to the ASME standard basically the same. Design pressure is approximatley 30kPa and the vessel has been in service for approximately 10 years. Cracks seven off at last count are up to 300mm through the shell plate though...
  6. JonD71

    In service weld repairs at 400 deg C on 304H S/S

    Has anybody had any experience with carrying out weld repairs to cracking on a 304H stainless steel vessel at 400 deg C. The vessel is not under pressure though operations are not keen to turn down the temperature to repair. Cracks are at a large nozzle to 300mm length. If anybody has had a...
  7. JonD71

    Flow rates in H2SO4

    I currently have an issue where an H2SO4 - 98% >70 deg C line has eroded at elbows/welds etc from flow induced erosion due to the velocity and volume of acid travelling through the pipe. I am looking to replae this line though currently have conflicting advice on maximum allowable flows prior to...
  8. JonD71

    Welding White Cast Iron in Sulphuric Acid Service

    We have a submerged pump casing with a minor pin hole through a web section. The casing is submerged and in hot sulphuric acid service. I have spoken with the manufacturer who is not keen to advise on the material propoerties other than it is made of a white cast iron. They have also advised...
  9. JonD71

    L14 - iron

    We have a pump casing made from L-14 iron and we want to know if we can carry out some minor weld repairs. The casing is ex USA and is in Sulphuric acid service. After some searching, I have not been able to find a material chemistry. Does anybody know of this material and can it be...

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