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  1. TangoCleveland

    Liquid Withdrawal Rate

    We have a 3600 gallon LOX dewar and we need to replace the pressure building coil. In the interest of sizing the coil correctly, I want to know how much LOX we need to vaporize to support a liquid withdrawal rate of 3 gpm at 30 psig for 16 hours. I'm getting stuck on mass and energy balances...
  2. TangoCleveland

    Code Relief Valve Forms

    I just discovered today that there exists a UV-1 form for ASME Code relief valves. I have been working with relief valves dor about 20 years, and this is the first I have heard of the form's existence. I have never received one when I purchased a Code relief valve. How long have these forms...
  3. TangoCleveland

    Pipe Rupture Sonic Flow

    We are trying to evaluate consequence of a pipe rupture for hazard analysis work. We want to determine what length of pipe will contribute flow through a rupture up to the point that sonic flow is achieved. Fluid is a gas (air, nitrogen, etc.) At time t=zero, we have a pressurized pipe with...
  4. TangoCleveland

    Lifting Levers

    We're having a discussion about requirements for lift levers on RVs. ASME BPVC Sec VIII Div 1 para UG-136(a)(3) states "Each pressure relief valve on air, water over 140°F (60”C), or steam service shall have a substantial lifting device . . .". We interpret the "air" fluid as being ambient air...
  5. TangoCleveland

    BLEVE and explosion software

    The software described at http://www.thermdyne.com/brochure.htm looks interesting. I have no connection with this company or the individuals. Larry
  6. TangoCleveland

    Old Valve Info

    We have an old 12" Rensselaer gate valve in service since about 1953. Some photos are at http://pg.photos.yahoo.com/ph/gmucs/album?.dir=82b6&.src=ph&store=&prodid=&.done=http%3a//pg.photos.yahoo.com/ph/gmucs/my_photos We're looking for material and pressure/temperature ratings. Any guesses...
  7. TangoCleveland

    Old Valve Information Needed

    We are evaluating old components in a 150 psig air system. We have several Rensselaer brand valves. Is there anyone here with some catalog information? Here are some sizes and models: 48" model D245A in 165 psig service 24" model 24-13A-2560 in 165 psig service 48" model 48-13A in 165 psig...
  8. TangoCleveland

    Code Case 2211 and UG-125(g)

    We are installing a 150 psig Code heat exchanger as aftercooler on a 40 psig centrifugal compressor. The relief valve for the system is on compressor discharge piping. We plan not to use a PSV on the exchanger, using the system PSV for vessel protection. Are within Code requirements? Please...
  9. TangoCleveland

    Code Case 2211

    Case 2211-1 says we can use system design in lieu of a relief valve to protect a pressure vessel if "The vessel is not exclusively in air, water, or steam service unless these services are critical to preventing the relase of fluids that may result in safety or environmental hazards." We are...
  10. TangoCleveland

    Max of mixed signs

    I have a column of forces from piping stress analysis. I want to find the greatest magnitude and retain the sign. If I have a -20000 lb force and a 10000 lb force, the MAX function will tell me 10000. There are 7 forces altogether, and I'm now using a formula...
  11. TangoCleveland

    Iron Plate, ASTM A129

    I'll be posting this in several areas. We have some old welded pipe fabricated from iron plate, ASTM A129. This standard was withdrawn in 1966 with no replacement. The 1947 spec says it's very ductile, 25% elongation in 8". Has UTS of 44 ksi and YS of 27.5 ksi. We're trying to decide...
  12. TangoCleveland

    PSV After Regulator

    Could someone please help my aging memory. . .. We always require a PSV downstream of a pressure regulator because downstream components are not rated for regulator inlet pressure. Failure scenario is wide-open regulator failure, simple sizing calculation. I've seen "requirements" in Fisher...
  13. TangoCleveland

    Air Receiver from Propane Tank

    An electrical co-worker asked me if a 20 lb grill-style propane tank can be used as a 150 psig air receiver for home use. I checked DOT, and the design pressure of 250 psig looks OK. What about altering the tank for a relief valve and a water drain? I'd suspect that the condensate could...
  14. TangoCleveland

    PV Derating to Non-code

    We have a surplus 1000 psig air cooled exchanger that we are putting into 10 psig steam condensing service. We need new nozzles in the headers, and are thinking about doing the installation to Code but without an R stamp. We realize this will permanently derate the vessel, and will remove the...
  15. TangoCleveland

    Rerate for lower MDMT

    I posted this question in the Code Issues Forum, and thought maybe I could get more opinions here. I have an SA516-70 (non-normalized) Div 1 Code Stamped vessel. It is stamped for 250 psig at -20F to 650F. Owner wants to reduce MAWP to get to MDMT of -50F. I believe I can use USC 66.1 chart...
  16. TangoCleveland

    Rerate for lower MDMT

    I have an SA516-70 (non-normalized) Div 1 Code Stamped vessel. It is stamped for 250 psig at -20F to 650F. Owner wants to reduce MAWP to get to MDMT of -50F. I believe I can use USC 66.1 chart to do this without impact testing. Preliminary results give me 185 psig at -50 to 650F. However...
  17. TangoCleveland

    Dewar Conversion, LN2 to LNG

    Aside from the obvious flammability issues, are there any tricks to converting mobile dewars of 500 to 4000 gallon capacity from liquid nitrogen to liquid methane service? Dewar pressures are around 50 psig. Larry
  18. TangoCleveland

    Dewar Conversion, LN2 to Liq Methane

    Aside from the obvious flammability issues, are there any tricks to converting mobile dewars of 500 to 4000 gallon capacity from liquid nitrogen to liquid methane service? Dewar pressures are around 50 psig. Larry
  19. TangoCleveland

    High Speed Balance vs. Low Speed

    We had a new compressor rotor high speed balanced at 12,000 rpm, with a final vibration reading of 0.14 mm/sec velocity. Some work was done on a shaft seal, and we are doing a low speed balance at about 1,000 rpm to save money. If balance is identical before and after the repair, what kind of...
  20. TangoCleveland

    Code Publication Date

    We're analyzing old undocumented vessels against Codes that were in effect at the time of their construction. Can anyone tell me when ASME BPVC Sec VIII Div 2 was initially published? Larry

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