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Recent content by donf

  1. donf

    Loose Flange Made from Two Half

    I agree with TGS4. Careful analysis is warranted. There is a split flange that I've used with success (in much smaller sizes) made by Marzolf Co. Regards, donf
  2. donf

    Duct taping spiral wound gasket

    I agree with not using duct tape as part of the sealing mechanism. I've also seen situations where the high chlorides present in the adhesive of certain types of tapes can cause problems. In one case, electric heat tape was secured to stainless steel piping. The combination of heat, tensile...
  3. donf

    instrument flange rating

    jte, I am also familiar with the exact situation you described. Certain flanged piping "specialties" are not commercially available in the "stronger" materials of construction. donf
  4. donf

    BYPASS REQUIREMENT IN GATE VALVE

    Gate valve bypass valves are also used a lot in steam systems - for the same reasons CheMatt mentions above. The bypass valve (usually a globe valve) allows a slow, controlled system warm-up, before opening the main valve. There's an MSS standard that covers relative sizes and orientations...
  5. donf

    Check valve Position

    I agree with Pennpiper (pump-check valve-isolation valve). In a parallel pump arrangement, having an isolation valve between the check valve and THE OTHER pump allows the defective check to be replaced, while the OTHER pump is pumping. donf
  6. donf

    Valve packing access

    Hello Danlap, Thank you. Section 5.2.11.11 is spot on. As you point out, in order to eliminate future problems with interpretation, it will be up to the purchaser (me) to more clearly define the requirements. You also bring up a very interesting point about requiring special tools/procedures...
  7. donf

    Valve packing access

    I'm looking for an Industry standard/specification/guideline/practice (U.S.) that addresses access to valve packing adjustment for actuated quarter-turn valves. I seem to recall seeing such a standard some years ago (I think it was an ASTM Specification), but have been unable to find it. The...
  8. donf

    Provision of Extended Stem to a ball valve in operating condition_Retrofit

    ET1983, Try also searching for "remote valve operator". Here's one company (of many): http://www.elliott-stow.com/index.html Whatever you use, be sure to securely support the extension so as not to side-load the valve stem and cause packing wear. As far as retro-fitting, while in service - you...
  9. donf

    ASME standard for Gasket

    In addition to saplanti's comments, make sure you specify the right pressure class for the gasket. Because of the additional flange thickness needed to accommodate the orifice taps, the orifice flanges may be a different class than the rest of the regular pipe flanges in the same system. donf
  10. donf

    2" OD Buttweld Pipe

    As MikeHalloran pointed out - If you want OD dimensioned tubular products, look for tube or tubing - not pipe. Search the internet for a company called Felker Brothers (or maybe Felker Piping Products). Don't remember the size range available, but I've gotten tube size elbows, tees, reducers...
  11. donf

    900# WN RTJ flange connection with WNRF 900# flange

    Check with your local gasket supplier for a spiral wound style that's dimensioned/designed for use with RTJ facings. One major manufacturer calls it their CGI-RJ style. I've used them with success to install RF valves between RTJ flanges. One key point is to verify that gasket contact area on...
  12. donf

    can flat face flange be installed with a raised face flange

    The answer to the question as posted is: Yes, it is acceptable. I've done it many times with no problems (usually involving pumps, not valves). I know of no industry code or standard that prohibits doing so. However - If the valve is cast iron - then NO. It is not acceptable. ASME B16.5 sect...
  13. donf

    Standard for Pressure Gauge

    Don't know if there's a code that governs, but........... My wife's grandfather was a boiler engineer in a Canadian paper mill. He actually gave me a pressure gauge from the 1920's that still functioned, and is a work of art. I had always heard that one should specify the range to be two times...
  14. donf

    Gaskets for hydrotests during turnarounds

    Don't know if this will give you a dimensional advantage, but some spiral wound gasket manufacturers offer a type of sp/wd gasket that is designed to be used with RTG flanges. Be sure to verify pressured rating of the gasket and check the condition of the contact surface of the RTG flange. It...
  15. donf

    Hot Pig?

    To all who responded - thank you very much, and again - sorry for the lack of details. I've been a member of this forum long enough to know that the better the situation/problem is described, the better the response. Turns out that the problem had to do with the failure of the heat tracing...
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