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Recent content by ytse

  1. ytse

    Hydro test Pressure Calculation in B31.3

    For example: flanges per ASME B16.5 are components with established ratings.
  2. ytse

    UHMW-PE pipe

    D4020 is just the material spec for extrusion materials, not for pipe. It does not provide physical properties information requirements such as hydrostatic design base (HDB), tensile strength, etc. to determine the wall thickness required for pressure containment. Is there such a standard...
  3. ytse

    UHMW-PE pipe

    Hi can anyone tell me is there a ASTM standard (or other published standards e.g. ISO) for UHMW-PE pipe ?
  4. ytse

    ball valve specification of drinking water

    The simplest solution is to select a valve that is NSF 61 certified. Check the following NSF website for the product. http://info.nsf.org/Certified/PwsComponents/index.asp?standard=061
  5. ytse

    Hydrotesting after flanged valve replacement

    B31.3 para 345.2.3 (b) stated: "Flanged joints used to connect piping components and subassemblies that have previously been tested, and flanged joints at which a blank or blind is used to isolate equipment or other piping during a test, need not be leak tested in accordance with para. 345.1"...
  6. ytse

    Flange Connection

    It depends on what code you are building to. donf gave you the B31.3 requirement. AWWA C207 required that "minimum bolt length shall be the sum of the mating flange maximum thicknesses, the gasket, and the depth of the nut plus 1/2" before torquing."
  7. ytse

    B31.1 allowable miter in steam pipe

    When you offset the flange that the butt weld. That would become a mitered joint.
  8. ytse

    B31.1 allowable miter in steam pipe

    B31.1 does not allow miter in steam pipe. Para 104.3.3 (A.3)stated that miters may be used only if "The contained fluid is nonflammable, nontoxic, and incompressible, except for gaseous vents to atmosphere" Since steam is a ompressible fluid, if follows that miter is NOT permitted.
  9. ytse

    Standards Pipe Lenght

    The standard of the pipe you are specifying (e.g. ASTM A53, A106, etc) has paragraphs about pipe lengths. For example, section 17 of ASTM A106 stated: 17.1.1 The lengths required shall be specified in the order, and 17.1.2 No jointers are permitted unless otherwise specified. 17.1.3 If definite...
  10. ytse

    Connect ANSI B16.47 A or B

    No. The bolt circle of Series A does not match that of Series B.
  11. ytse

    HDPE Pipe & Fittings Tests

    ASTM D3035 specified the minimum burst pressure requirements of HDPE pipe for the different wall thicknesses (SDR).
  12. ytse

    Allowable stress for 904L pipe materials

    First, you cannot use A240 for pipe. Para 123.1.1 (B) of B31.1 stated: "A material conforming to a specification for which allowable stresses are not listed in Appendix A is acceptable provided its use is not specifically prohibited by this Code Section and it satisfies one of the following...
  13. ytse

    Is there an HDPE flange that bolts to an ANSI CS flange?

    Use a HDPE flange adaptor(http://www.kwhpipe.ca/pdfs/IPS_Flange_Adapters.pdf) and a metal backing flange (http://www.kwhpipe.ca/pdfs/IPS_Ductile_Iron_Flange.pdf) All these metal backing flanges have bolt pattern that match ANSI flanges.
  14. ytse

    Stud bolt lengths

    Please check Annex C (Method for calculation of bolt length) of ASME B16.47 (Large Diameter Steel Flanges NPS 26 through NPS 60).
  15. ytse

    Schedule 40 Pipes and Sch.80 Pipes

    The piping code is the document you need. Each piping code has different methods of calculating pressure limitations. Since your pipeline is built to B31.8, that is the document you should use. Specifically, Section 841 of B31.8. In addition, you need to know more about the pipe than just...
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