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  1. ColonelSanders83

    B31.8 Compressor Station Replacement of existing lines and required analysis

    Hello All, If I replace the piping in aa B31.8 compressor station with an exact duplicate of what is currently installed, do I need to perform an new pipe stress analysis? The reciprocating compressors at this station have been in operation for more than 40 years and the decision has been made...
  2. ColonelSanders83

    Welding ammonia piping with an argon backpurge

    Hello All, I have suddnely found myself needing to weld a few sock-o-lets to a couple of ammonia lines. Apparently the holes have already been cut in the lines and I have been requested to evaluate the use of Argon as a backpurging gas in the pipe to perform the welding. Apperently there is a...
  3. ColonelSanders83

    Substituting DSAW for ERW B31.3

    Hello All, Background: Released a bill of materials to purchasing to get ahold of all the long lead items for a project about 6 weeks ago. Included was a 40' lenght of NPS 48 API 5L Gr. B ERW SCH XS (0.50" WT) pipe. Piping design code is B31.3 Normal Fluid Service. The Fumble: Purchasing...
  4. ColonelSanders83

    UT handheld meter for section IX and AWS D1.1

    Hello All, I have been asked to look into obtaining the capability to perform in house Ultrasonic testing of weld made to both ASME section IX and AWS D1.1. We are currently using an outside vendor. Besides the training of our current staff or the hiring of an experienced expert (my...
  5. ColonelSanders83

    Weld-O-Let in 18" SCH 40 pipe

    Hello all, I have a number of small bore pentrations to make in an 18" sch 40 line, I had been planing on using weldolets and socklets depending on size, however I notice sch 40 is not listed in the fitting class of MSS SP-97. I need the full wall thickness of sch 40 for my service and I...
  6. ColonelSanders83

    Is aditional support required when PWHT a vessel?

    Hello All, Here is the skinny. We have a 66" diameter A516 Gr70 vessel with a 3/4" wt. We have added three nozzles to one end (on the overhung portion of the vessel past the saddle support) and we are about to PWHT the modifications. The costumers engineer has come out with a question from...
  7. ColonelSanders83

    Is it possible to convert from sound power to sound pressure level?

    Hello All, Due to some ignorance on the part of our sales department we ended up with a contract which referanced a maximum Sound Power Level of XX DBa. The exuipment manufacturer is garunteeing Sound pressure level. I have been tasked with converting between the two, but I have very little...
  8. ColonelSanders83

    Plate rolling machine

    Hello All, I am a mechanical engineer at a pipe fab shop. Recently we have been implementing the use of reinforcment pads on the piping much more frequently than in the past. Currently this involves either having a vendor roll repads for us or use a manual press to shape the pads to fit the...
  9. ColonelSanders83

    AWS D1.1 Structural weld details

    Hello All, It recently came to my attention that we make Tjoint in W sections using a full pen B-U4b-GF weld on the flanges and opposing 1/4" fillet welds on the webs and flanges one jointing beam is smaller (see the attached picture). In my reading of the code and looking at our weld...
  10. ColonelSanders83

    B31.1 Vacuum Piping and Out of Roundness

    Hello All, I am currently designing a geothermal power plant piping system in which we are using an expensive refrigerant as our working fluid. One of our operating cases is a full vacuum during working fluid evacuation. Thus I am designing the piping to handle a 15 psi external pressure as...
  11. ColonelSanders83

    Weld Procedure Improvement

    Hello All, At the company wher I am employed we do alot of pipe butt welding. I believe the weld procedure we are using is costing us time and money but I am not a welding expert. Our proceedures are ASME BPVC section IX complient, however they were all developed by people no longer employed...
  12. ColonelSanders83

    BTH-1 Design of BTH devices - how to evaluate "strenght of welds"

    Hello All, I am currently evaluating a bolt on lifting device. I am attempting to evaluate one of the welds and I have gotten myself confused. BTH-1 para 3-3.4.1(b) states "The design strength of welds subject to shear shall be equal to the effective area of the weld multiplied by the...
  13. ColonelSanders83

    Design against gaseous cavitation

    Hello All, At my company we recently had an interesting issue with cavitating pumps. Two 100% pumps were installed in a chilled water plant and were operating quite happily until the late addition of a thermal energy storage tank (TES, large tank, open to the atmosphere). Pump Flow rate =...
  14. ColonelSanders83

    Pump Suction Diffuser Technical Information

    Hello All, I have recently been tasked with creating a white paper at my company. The subject is the use of suction diffusers on pump inlets and the benefits thereof vs an elbow straight into the pump suctions. All of our pump are centrifugal water pumps running between 1000-6000 gpm. Most...
  15. ColonelSanders83

    ASME B31.3 Code Compliant Flange Bolting

    Hello All, I have been charged with ensuring B31.3 code compliance for a packaged process plant being built at my company. All the piping comes under the same criteria, but I have chosen the highest pressure and temperature line for an example. 6" sch 40 pipe ,A105 600# flanges Fluid: Gentron...
  16. ColonelSanders83

    Requirements for Code Stamps and Nonboiler External Piping

    Hello All, My place of business builds chilled water plants, on this particular occasion our client has invoked ASME B31.1 rather than B31.9 (they see this as a district heating and cooling application per B31.1 scope section 100.1) No part of our plant will generate steam; there will be no...

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