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  1. phllp581

    Pressure Test Rating above WOG Rating

    Is it allowable to pressure test above a WOG rating? For example my MAOP is 540 psig, thus I am using 600 WOG parts. But for my pressure test I will be testing at 810 psig to 864 psig. I will be exceeding the WOG rating of 600 during the pressure test, but I will never be operating that high...
  2. phllp581

    PE pipe and high tempertures

    Hi, I am considering crossing a steam line with a HDPE pipe used to service natural gas. I plan on using a steel casing to help protect from the high tempertures produced by the steam line. Does any one have experience with this or is there any publications that provide guidance on this. I am...
  3. phllp581

    External Pressure on a Pipe

    Can anyone refer me to a method or standard for calculating pipe stress when applying a external pressure to a pipe? For example, I am installing a fully encompassing spherical fitting around a existing run to create a new branch. After welding the spherical onto the existing run I am suppose...
  4. phllp581

    SMYS Rating Prefix

    Can someone explain the prefix letter on SMYS ratings. For example I have always seen pipe with an X (i.e. X42, X52). But I have seen fittings listed as F52 or Y60. What is the difference between the prefixes?
  5. phllp581

    Natural Gas Metering

    Is there a standard for calculating Actual Gas Flow for diaphragm meters? I am aware of AGA standards for rotary, orfice, ultrasonic and corlios meters but I am unaware of anything for diaphragm meters.
  6. phllp581

    Sch 40 vs Sch 80

    Can you mix Sch 40 and Sch 80 pipe/fittings? For example I am having a hard time finding 3/4" Sch 40 API 5L FBE Seamless pipe, but I can find Sch 80, Is it okay to upgrade to Sch 80 and intermix with Sch 40, or will the fittings and pipe not connect properly?
  7. phllp581

    Butt Fusion vs Electro Fusion

    Yes I was talking about PE pipe. I am typically dealing with 2" to 8" MDPE pipe and I am trying to determine which type of fittings (e.g. elbows, tees, reducers) would be best to specify for a natural gas distribution main (either butt fusion or electro fusion).
  8. phllp581

    Butt Fusion vs Electro Fusion

    Can someone briefly descibe the differences between butt fusion and electro fusion. My understanding is butt fusion uses heat to connect the butt ends of pipe while electro fusion runs electrcity through a fitting connecting two pieces of pipe to connect the pipes with the fitting. Is it...
  9. phllp581

    Flange Ratings and Bolt Patterns

    When specifying flanges, is it possible to abut different ANSI ratings to each other (e.g. 150# abutting to a 300#)? Or will there be problems with the bolt pattern, gasket, etc., not fitting correctly?
  10. phllp581

    Caclulating Head Loss and change in Velocity

    Thank very much for all the help! I was able to use the Isothermal Equation above to get my solution and matched the answer Pipeline Toolbox is giving me for flowing through straight pipe. My next question is how do apply the concept of Resistance Coefficients and Flow Coefficients to this...
  11. phllp581

    Caclulating Head Loss and change in Velocity

    My application is trying to determine the pressure loss and velocity change of natural gas that flows through a piping system including several fittings (tees,90s, 45s, restrictors, etc) and valves in an open position. In my problem I know the pressure in, the flow in, and the velocity in to the...
  12. phllp581

    Caclulating Head Loss and change in Velocity

    What if I wanted to calculate pressure loss through fittings for a gas? I could use the above formula with an equivalent legnth (in-lieu of length), but that only works for some fittings. If I was to run through a restrictor, I would have to use a resistance coeffecient and that would ppush me...
  13. phllp581

    Caclulating Head Loss and change in Velocity

    What about when dealing with a gas? How would I go about calculating the velocity out then?
  14. phllp581

    Caclulating Head Loss and change in Velocity

    After using the Darcy Weishbach equation to calculate head losst through a pipe, can I then take that head loss result and apply Bernoulli equation to calculate the new velocity given the head loss? If I do it this way I seem to get velocity in=velocity out, but this doesn't seem to be right...
  15. phllp581

    Pressure drop through a reducing tee

    How would you calculate the pressure drop through a reducing tee (2" run with 1" branch)? I can calculate the pressure drop through a tee using Darcy Weisbach equation with an equivalent length for the tee, but I'm not sure how to treat a reducing tee. I suppose I could just calculate the...

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