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  1. 1974vet

    Tables for pipe support spacing

    (please post the hicks equation as commented) Sorry for delay . . . From Hick's 1. Compute the allowable span between hangers for a pipe filled with water, S = WL^2/8m, where S = bending stress in pipe, lb/in^2; W = weight of pipe and water lb/lin in; L - maximum allowable distance between...
  2. 1974vet

    Tables for pipe support spacing

    Here goes my efforts to explain (hope isn’t too long)- A little more info on the “span charts”: Looking at Navco, p150, the Navco suggested support spacing is based on 2300 psi bending stress. MSS-SP-69, p8, is based on 1,500 psi, although I can’t seem to quickly find it in the text. There are...
  3. 1974vet

    Scope - Tank Vent Piping/Ducting

    Steve, Agreed, API-2000 does not address this issue, but NFPA 30 does. The following are excerpts: "3.2.1 Performance Standards. The design, fabrication, assembly, test, and inspection of piping systems shall be suitable for the expected working pressures and structural stresses. Compliance...
  4. 1974vet

    Scope - Tank Vent Piping/Ducting

    API-610 = API-650 sorry
  5. 1974vet

    Scope - Tank Vent Piping/Ducting

    What code applies to the piping/ducting that is connected from a tank nozzle to an emergency vent/conservation vent? For this example, a tank built to API-610 is located indoors, and the piping/ducting essentially routes up throught the roof to the emergency and conservation vents. B31.3 appears...
  6. 1974vet

    Thermal Relief on the line

    Thanks EGT01, After some searching, I actually found the Refrigeration and Air-Conditioning reference! On page 280 there is Table 21B "Allowance for sun effect". The value selected in the CEP article, 15F, corresponds to the intersection of "medium colored surfaces", e.g., brick, red tile...
  7. 1974vet

    Vent pipe calculation and the expansion factor "Y"

    Another approach: ran the situation on AFT Arrow demo, got 4,087 scfh using 100% methane. www.aft.com
  8. 1974vet

    Caesar II oddity

    Greg, Take a look at the GLOBAL forces and moments in the report section. Your answer should be here. Also check out the online documentation for nomenclature. FX, FY, MZ, etc, are global values (upper case) while fx, fy, mz, etc, (lower case) are local. Again, check the documentation for...
  9. 1974vet

    Thermal Relief on the line

    If you have access, the following info should be helpful: 1. "Decide Whether to Use Thermal Relief Valves", F. Bravo and B. D. Beatty, Chemical Engineering Progress, December 1993 2. "Safer Relief Valve Sizing", W. Y. Wong, Chemical Engineering Magazine, May 1989 3. "Forestall Pipe Bursts", D...
  10. 1974vet

    Bursting disc/RV/RO

    Just some thought jotted down: The pilot valves or modulating type, may be required by whatever applicable code is for your specific application to deliver the full pump capacity. Don’t know what they are, but an example is an NFPA requirement that these type valves be required on the...
  11. 1974vet

    Code Violations

    Some other thoughts just in case not already considered: When using FEA to "verify" code calculations, be sure that the appropriate safety factors have been applied. In other areas (particularly with the use of composite materials) we have seen failures as a result of this oversight...
  12. 1974vet

    B31.3 relief valve requirements

    In the areas that I have worked (not supercritical C02), the question always boiled down to: will the proposed configuration satisfy the requirements to be a code installation? Since not using the rated valve results in a non-code installation, the question may be: can you have a non-code...
  13. 1974vet

    Pipe end loads

    This is not intended to be a complete answer, but is for your consideration. You did not say what diameter the pipe was, which matters. The larger the diameter, the more difficult the fix, if required. For rough load values, take the temperature change and calculate the change in length of pipe...

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