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  1. TCBQCM

    Teflon Tape on 8 round threads?

    What commercial dopes do you recomend? We currently use Jet-Lube Heavy duty PTFE thread sealant TF-15 or copper Kote. Our procedur is to wrap with teflon tape then apply dope to the teflon tape before connecting male thread to femail thread. The test pressure is 2000psi. This has worked very...
  2. TCBQCM

    Teflon Tape on 8 round threads?

    Is it common practice to use teflon tape on 8 rd (EUE) threads? In regards to 5.5" 8 round threads during a 2000psi Hydro-test...
  3. TCBQCM

    Can 4140 Hot rolled material be welded to SA 350 material?

    Side entry: We are unable to find SA106B material with wall thicknes we need with the proper bore this part (I believe) needs to be machined from a solid shaft. I don't believe we can get SA106B solid shaft. Do you have any other machinable solid shaft in mind that would be weldable. We are...
  4. TCBQCM

    Can 4140 Hot rolled material be welded to SA 350 material?

    Please see attachment. It has been uploaded to ENGINEERING.com. Please see link. Thanks again for your help!!http://files.engineering.com/getfile.aspx?folder=5847e323-a2e9-4f8d-98a7-2c878a86430b&file=Spacer_spool.pdf
  5. TCBQCM

    Can 4140 Hot rolled material be welded to SA 350 material?

    Thank you for your information metengr. I have a couple more questions: 1. We must have a side entry on this spool that is machined then welded on at a 26 deg from side wall of the main body. the main body if we go with SA 106 B material. What material would you machine the side entry with...
  6. TCBQCM

    Can 4140 Hot rolled material be welded to SA 350 material?

    metengr, This is an eng. fitting. It is a spacer spool with branch assembly. Materials have been supplied I have regusted a review of all MTRs. I will have the grade shortly. W/P of this peice is 3000psi and the temp range is -20C to +100C. This was designed and eng. in a machine shop the 4140...
  7. TCBQCM

    Can 4140 Hot rolled material be welded to SA 350 material?

    I have a project that requires me to have SA 350 flanges that are 2 1/2" thick welded to 4140 Hot rolled mechanical tubing that is 1 3/8" thick. What would be the pre-heat temp? What would be the max interpass temp? Also should we PWHT this? If so at what temp and for how long? Thank you for any...

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