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  1. Bourbon103

    Net Expansion Factor; K>100??

    Hello All, My brain's a little fuzzy this afternoon, but I'm running into a problem with Crane T.P. No. 410, pg. A-22 "Net Expansion factor Y for Compressible Flow..." For my example: P1 = 40 psig + 14.7 = 54.7 psia P2 = 0.397 psig + 14.7 = 15.097 psia DP = 39.603 psia DP/P1 = 0.724 K = 752...
  2. Bourbon103

    Flame arresetor on Mineral Oil tank?

    We are going to use a 1500 gal. tank as a mineral oil hold tank; totes of mineral oil will be pumped into the tank and mineral oil will be metered from the tank for various uses. The only "process" in the tank will be to heat it to 100C while sparging N2 to drive off enough entrained water to...
  3. Bourbon103

    Vents to Knockout Pot Issues

    Hi All, We have a knockoutpot which takes in multiple reactor vapor vents (typically set to 1 psig or a few oz's) from a different building. Each vent line typically connects vents from multiple reactor sources. Great pains have been taken to ensure that for each vent line to the...
  4. Bourbon103

    #6 Fuel Oil - Thermal Expansion issues

    There is an existing relief valve (1/2" x 3/4") on an 8" NPS #6 Fuel Oil header. The header is traced with 75# steam. The header is ~545 ft long. I am sizing the relief valve for thermal expansion and getting 273 GPM required flow, per API 521-2007, pg. 33, which in my experience is WAY more...
  5. Bourbon103

    Section IV Relief Valves?

    Can you have a Section IV relief valve on a Section VIII rated vessel? The vessel (water-water "water heater") is is rated: shell = 155 psig @ 220F, Tubes = 150 @ 315F. The operating temps. are shell= 160-180F, tubes = 40-140F. Operating pressures well within MAWPs. The relief valve is a...
  6. Bourbon103

    API 520, 7th Ed. = No External Fire Sizing??

    I noticed that between the 6th and 7th editions of API 520, part 1, that External Fire sizing on process vessels has been omitted. Specifically, the 6th edition includes 'Appendix D-Determination of Fire-Relief Requirements' wherein the heat load due to fire on the wetted vessel surfaces can be...
  7. Bourbon103

    Gradfathering with 3% inlet drop?

    Stab in the dark: A client has a 3-way safety selector valve with (2) relief valves, circa 1960s, on a 75 psig steam line. They want to replace the 3-way and eventually the relief valves (down the road). The failure scenario is a failure of the 300 psig/75 psig pressure reducing station OR...
  8. Bourbon103

    Auto-Ignition considerations?

    I have a relief valve on a reactor that we are considering a fire scenario, 85% filled with heptane. My concern is that the normal auto-ignition temperature of heptane is ~399F-433F and at the set pressure of 50 psig, the corresponding vapor temperature is 320F. I have read that a species'...
  9. Bourbon103

    Flashing, 2 Species PSV Discharge - Pressure Drop?

    The relief valve discharge of a thermal expansion scenario, with two species, is expected to be one species will remain liquid, the other will partially flash to vapor with the rest remaining liquid. The relief is calculated to be relatively small (<3GPM liquid at the RV inlet) through a 1/2" x...
  10. Bourbon103

    #6 Fuel Oil PSV sizing

    The relief valves are on an oil pump and an oil heat exchanger (steam in the tube). The area the relief valve is in is a PSM (process safety management) area that is considered for external fire. Are hydrocarbon relieving valves exposed to fire sized the same way as the "vaporizing liquids"...
  11. Bourbon103

    Fire Scenario restrictions?

    I have a heat exchanger that external fire is considered the controlling scenario for over-pressurization. Currently, relief is in the form of a 6" x 10" relief valve on the inlet to the shell ~1000 ft. away in another building. I know per ASME XIII that an ASME coded vessel requires at least...
  12. Bourbon103

    Set Pressure &lt; MAWP

    I have an existing relief valve: relief valve set pressure = 15.1 psig ASME vessel MAWP = 200 psig required relief capacity = 78 gpm (water) valve rated capacity (@ 15.1 psig) = 546 gpm The relief valve is obviously oversized but it...
  13. Bourbon103

    PSV sizing for chiller

    I have to size a relief valve for a water chiller. The chiller consists of a compressor feeding R-123 to a water cooled condeser which then feeds and cools water in an evaporator finally returning back to the compressor. As far as the water goes, tube rupture is being considered. My question...
  14. Bourbon103

    PSV in after-cooler tube rupture case

    I have a process where an air after-cooler is fed 180# air on the tube side, cooling tower on the shell side. The MAWPs are: Shell: design = 150# , test = 225# Tube: design = 300# , test = 450# As per thread124-77346, "This is a remote but possible failure that API allows you to accept up to...

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