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  1. SamSnead

    Pipeline Thermal Relief Valves

    Here is a sample post that mentions the 500 liters as a rule of thumb: http://www.eng-tips.com/viewthread.cfm?qid=83163 And, I've read 4 or 5 similar posts.
  2. SamSnead

    Pipeline Thermal Relief Valves

    The fluid is crude oil.
  3. SamSnead

    Pipeline Thermal Relief Valves

    Hi All, I have seen and read posts that say rule of thumb is to install a thermal relief valve for every 500 liters of liquid. I have a 24 in pipeline that is 1000 ft long. Does this mean I have to install a TRV every 6 ft? That’s 167 TRVs. IMO, that seems like a lot of TRV for a straight pipe...
  4. SamSnead

    Liquid Pipeline Pressure drop

    I am familiar with the velocities. My question is about pressure drop – is there a rule of thumb? 0.1 psi/100 ft? 0.5 psi/100 ft? 1 psi/100 ft?
  5. SamSnead

    Liquid Pipeline Pressure drop

    Hi all, Is there a rule of thumb for the maximum pressure drop in a liquid pipeline (psi/100 ft)? I am used to sizing gas plant piping and haven’t done liquid a whole bunch. Since liquid is an incompressible fluid, I will expect the pressure drop to not be as significant as experienced in gas...
  6. SamSnead

    Importance of flowrate in shut down valve design

    I filled a lot of RFQ and data sheets for valve procurement and noticed that the fluid flowrate is usually NOT REQUIRED in designing shutdown valves. I find this peculiar. Does anyone know why? On the data sheet, they request for virtually all other fluid properties, but not flowrate. I am...
  7. SamSnead

    PCV and BPV Operations

    Thanks, LittleInch. What about a PV (not a PCV)? A PV usually acts like a BPV by using a sensor and a transmitter up stream to keep the pressure at a set value. For example if you have a PV on the vapor stream out of a scrubber set at 50 psig (see attached diagram). Now, this PV acts like a BPV...
  8. SamSnead

    PCV and BPV Operations

    Hi everyone, I am a "green" process engineer and have a couple of questions about regulator data sheets. On the data sheets that we provide for vendors to get quote, you have to put in the inlet pressure and pressure drop across the valve. I have included a diagram. If a BPV is set at 50 psig...

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