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  1. TD2K

    Selection of seat material based on Operating or design temperature.

    Unless I had a very, very good reason I use the design temperature. Why? Because that is the temperature that the system can operate to so my materials in turn should be good for those materials.
  2. TD2K

    referigeration tor regarding.

    I think you need a mass flow of the butadiene in that equation Latexman.
  3. TD2K

    Above ground, But buried

    Lots of the pipelines in Saudi Arabia were constructed like that. I thought there was a specific term but I can't remember it (it's driving me nuts). All I come up with are berms but I don't think that is correct.
  4. TD2K

    Is there a specific way to depict a split signal for a PID control loop?

    My experience is that there is no standard way how the instrumentation engineer or client wants these shown. Yes, I know ISA likely defines something but the individuals involved all seem to have their own preferences. As a process engineer, I would just draw two dashed lines from the LIC...
  5. TD2K

    Hydraulics involving VERY thick fluids?

    I don't have any experience with grease calculations and a quick look suggests my concern that this material is not a newtonian fluid is correct. Not an area that I have experience in. 1/4" by 5" = 0.13 ft/sec at 0.5 gpm and it's far slower in the main cylinder...
  6. TD2K

    PSV sizing blocked compressor outlet (Max flow through centrifugal compressor)

    < Unfortunately I do not have the differential head curve but I do have pressure ratio curve which I think will correspond to the head curve. If I understand you correctly you are indirectly saying that the pressure ratio curve is also valid for the increased suction pressure, not just the...
  7. TD2K

    API Trim 10 instead of Trim 12

    316 generally has better corrosion resistance than 304 in many services but for a clean, sweet service like ethane it's a moot point between the two.
  8. TD2K

    PUMP NPSHA

    I'm having a hard time following the information. For a given flow, the NPSHR from the pump curve is in feet of liquid and it's the same feet of liquid be it feet of of ethylene or feet of propane or feet of water. So, assuming with ethylene you need 5.2 ft of NPSHR at 2160 gpm, you need 5.2...
  9. TD2K

    Knock out pots as &quot;Piping Components&quot;

    I've seen that done. Strainers for example can be purchased with a code stamp (have to consider fire at a minimum IMO) or non-code in which case most of the clients I've dealt with are willing to treat it as part of the piping and isn't protected against fire. ASME Section 8, Div 1 has a good...
  10. TD2K

    API Trim 10 instead of Trim 12

    Since the piping is 304 SS and this isn't used much, I wouldn't see a concern with it.
  11. TD2K

    PSV sizing blocked compressor outlet (Max flow through centrifugal compressor)

    < how can there be any flow at all in the blocked outlet case? > The flow goes through the PSV to avoid over-pressuring the system. Look at the flow curve for the compressor. Calculate the head required to compress the inlet gas from its inlet pressure to the relieving pressure. Use the...
  12. TD2K

    Pump cavitation due to discharge pressure

    It's a matter of NPSHA versus NPSHR. NPSHR for most centrigal pumps increase with flow and past the BEP, significantly. A fully open discharge valve gives you the maximum flow if there no type of flow control device on the pump such as variable speed or a discharge control valve. So max flow...
  13. TD2K

    NPSH

    Your equation is correct. The issue is what pressure drop do you use for the strainer? Do you use it as an equivalent length of piping per the vendor's charts which is when the strainer is clean? Or do you want to assume a fixed dP representing the pressure drop in a dirty state? If you are...
  14. TD2K

    difference between class and grad

    " whay we say this point in to isulation....isulation dont have any flange>? " < i talk about insolation joint whith material api 5l grade b and class 600# > I don't know what you are referring to. Are you talking about an electrical insulation flange? kit?
  15. TD2K

    Maximum Velocity of flow at oil Pipeline

    An approach I've seen used is the errosional equation from API-14E, 100 divided by the square root of the density which for most oils gives a maximum velocity in the mid teens (ft/sec). For short term operation, you can use a value 25% higher. If it's a clean fluid and you aren't close to the...
  16. TD2K

    Compressor and receiver Sizing Question

    What are the units associated with the 263 capacity? I assume it's L/sec at normal conditions. During the draw down time (240.7 sec), the air used is 157.4 L/sec * 240.7 sec = 37886 L This is supplied by the decrease in pressure in the receiver from 825 kPa to 700 kPa or a dP = 125 kPa. That...
  17. TD2K

    difference between class and grad

    api 5l grade b is the material as previously said, it's carbon steel. 600# refers to the flange class, look for a copy of B16.5. The class sets the maximum pressure that flange can withstand for a given material of construction and temperature.
  18. TD2K

    PSV without calculation

    What do you mean by "fail"? If the pump can not overpressure the piping and would basically "stall", then I would accept a calculation note. If by fail you mean a loss of containment due to failure of the pump, then I would want a relief valve sized to prevent that.
  19. TD2K

    Pipeline Thermal Relief Valves

    < I have seen and read posts that say rule of thumb is to install a thermal relief valve for every 500 liters of liquid > That makes no sense. I've seen some guidelines about installing thermal relief valves if a section of piping that can be blocked in is greater than a certain distance but...
  20. TD2K

    Pressure Relief Valve For Fire Water System

    You might want to check the latest edition, your copy is pretty old. < it is stated that the minimum relief valve size for 1000 gpm is 4 inch > The 4"is the body size, I would assume the inlet flange but I haven't looked in the NPFA 20. If there isn't a sizing method in NFPA 20, then I would...

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