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Recent content by jdarco

  1. jdarco

    Does UBRS (User's Basic Requirement Specification per ASME RTP-1) requires for FRP Tanks?

    If you want the vessel ASME RTP-1 stamped, you need to provide a UBRS to the fabricator. FRP pressure vessels are covered under ASME Section X.
  2. jdarco

    Check valve for vacuum relief

    Peasant, Can you share more info on the valve you found? Make and model? I sometimes get involved in similar applications and am interested in what you found.
  3. jdarco

    Gasket Installation & FRP Flanges

    The piping/flange manufacturer should have installation procedures for their flanges, but Mr. Perry pretty much has it right. Full face gaskets, typicslly a "softer" material (EPDM, Viton, Red Rubber), 1/8" or 1/4" thick, washers under the bolt/nuts (that is important). Most piping/flange...
  4. jdarco

    "Large" Full-Bore Trunnion Ball Valves - PVC

    I don't think you will find a full port plastic ball valve in that size. As ZDAS found, best bet for that size will be gate valves. There are also diaphragm valves available, but will be a weir style. Check out www.asahiamerica.com
  5. jdarco

    Air Reciever Tanks Fabrication

    Air receivers are a pretty "standard" item made by many firms. I would think it would be simpler to just buy from a regular producer of these items, even if they have to modify them slightly for your needs. Then you get all the stamps, approvals, etc....
  6. jdarco

    Underground Storage Tank (Containing Gas)

    Look at UL, I know they have standards for underground gas tanks, both in metals and fiberglass. I just can't remember the numbers off the top of my head.
  7. jdarco

    HDPE storage tank

    Although the HDPE may be chemically compatible, I suspect you'd have some problems with the local fire marshall. There is really no way to effectively ground a HDPE tank. We had once instance where a methanol supplier wouldn't fill a poly tank. I'd look at carbon or stainless, built to UL142...
  8. jdarco

    Secure Connection Soft "Pipe" to Hard Pipe

    Are you injecting something into the line with the tubing? If so, look up "injection quill" and you may find something that will work. Or, why not just drill and tap the PE or PVC pipe, assuming it has enough wall thickness, and use a MPT x Compression fitting like Jaco or Parker?
  9. jdarco

    Chem-Aire v. Duraplus ABS Piping - Equivalent?

    Both are ABS systems for compressed air, and as such would probably be considered "equals". However, Chem Aire follows IPS dimensions, I think Duraplus follows metric DN dimensions, if that matters. Both have adapters to get to NPT, flange, etc... Both also have issues with some synthetic...
  10. jdarco

    How to Anchor PVC and CPVC Pipe

    I recall seeing a procedure where "shoulders" made from split pipe were solvent welded either side of a standard pipe clamp to act as anchors, but can't find the reference offhand. The clamp was not tight to the pipe, more as a guide. I'd check Chemtrol (Nibco) or Harvel, both have pretty good...
  11. jdarco

    Piping specs for compressed air and water

    Do NOT use PVC for compressed air! All the major pipe and fitting manufacturers advise against PVC for compressed air and you void all warranties. In a failure, PVC will become like schrapnel and the compressed air has a lot of energy. If you have a corrosive environment, look at some of the...
  12. jdarco

    DIN & ASTM Standards for PVC/CPVC, PVDF & PP Sockets

    Check out the George Fischer web site. They make both IPS and DIN dimension piping systems and may have the information you need on their site. www.gfpiping.com Also may want to check Spears Manufacturing, although I don't know if they have the DIN info. www.spearsmfg.com
  13. jdarco

    Banjo Fitting Manufacturer Identification Help

    Try www.banjocorp.com They make the fittings shown in US Plastics catalog
  14. jdarco

    Sodium Hydroxide Agitation

    You could use a small centrifugal pump (the mag drive mentioned earlier is a good choice) with a couple eductors in the bottom of the tank to provide continous mixing. The nice thing about the eductors is no moving parts! If you do use the mag drive pump, make sure they trim the impellar for...
  15. jdarco

    Double Wall Storage Tanks

    Some above ground fuel storage tanks are encased in concrete to protect against vehicle impact, ballistics, etc...Check out www.convault.com But I agree with vesselguy about this application.
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