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  • Users: philruh
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  1. philruh

    Plugging Air Pre-heater tubes

    We have a furnace with a Hamon air preheater, with 5 banks of tubes, They are planning to blind both ends of a cast iron "tube" bank in an existing air pre-heater. The tube bank is 2'x11'x10' and they are assuming half of this volume is being blinded. The concern is that if the tube...
  2. philruh

    How big a hole is needed?

    They are planning to blind both ends of a cast iron "tube" bank in an existing air pre-heater. The tube bank is 2'x11'x10' and they are assuming half of this volume is being blinded. The concern is that if the tube is not leaking, that the pressure will build up inside during heat...
  3. philruh

    Relief Valve will not close! Steam trace?

    Ethylene balanced bellow relief valves, discharging to plant flare system. Plant wanted platforms so that they could safely access relief valves. They need access, to handle steam lances, to thaw valves after they relieve, the valves do not close, and are covered with ice. After melting the...
  4. philruh

    Pumps in series, does maximum suction velocity apply?

    With a multistage centifigal pump, hydrocarbon, NPSHr 18, SG .5, being fed from another pump (two pumps in series). Does the maximum suction velocity guidlines apply to the second pump. If so why. Start up? Bubbles? Erosion?

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