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  1. kdt

    PSV requirements on Pumps

    Montemayor, I agree that pumps are not normally blocked-off at the suction. However, many applications have isolation valves on both the suction and discharge to allow for maintenance of the pump in instances where pumps are installed in parallel, or to prevent draining the entire system to...
  2. kdt

    PSV requirements on Pumps

    Is there a section of the code which deals with the requirement for PSVs on Pumps for Thermal Expansion case? I am used to seeing on heat exchangers and vessels which can be isolated but not pumps. Another side question on the same topic. Generally when are PSVs required on piping for...
  3. kdt

    Velocity of compressed air inside pipe

    Poseilus, I would highly recommend getting a copy of Crane Technical Paper 410. An extremely valuable resource for pressure drop calculation work. Deals with Liquid and Gas.
  4. kdt

    Location of Instrumentation for Valve Control

    Two questions on placement of instrumentation in relation to controlled valve. My collegues don't agree with one another so... 1) Temperature Transmitter (TT) to close a valve on High Temperature Alarm to protect downstream system. I have seen this control loop with the temperature...
  5. kdt

    Estimating the loss of steam via passing valves

    Razif Some steam trap companies will come and do a steam trap audit for you for a minimal cost (sometimes free). You will be provided with a breakdown of where the losses are located, quanity of steam at each location, cost, and more likely than not the model number and cost for their...
  6. kdt

    Design allowance for Aging

    Can anyone provide a reference for design factors/allowances used for the increased roughness factor of a pipe for the design life of the system when calculating the pressure drop? Are there any rules of thumb? I have heard of using 5 times or 10 times roughness factor for aging of pipe but...
  7. kdt

    Hydraulic Calcs - Effect of Roughness of Aged Pipe

    1) Does anyone have a good reference regarding the effect of increased pipe roughness due to corrosion and what should be looked at in the hydraulic calculations. We are looking at adding approximately 5km to an existing piping system and are using 5x roughness for the pipe. 2) Does...

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