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  • Users: gmax137
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  1. gmax137

    piston rings & sealing against cylinder wall

    I had someone telling me about drilling small holes, down from the piston crown into the small space "behind" the top piston ring, purportedly to allow the combustion pressure to get into that space and force the ring out against the cylinder wall. The theory is that the gap between the top face...
  2. gmax137

    Pump start and time to begin flow

    I'm looking at some recorded data that shows both pump rpm and flow (measured a ways downstream). There seems to be a long delay between the time the pump is at speed and the time when flow begins. This is for a steam-turbine driven pump, so I expected to see a delay from when the steam supply...
  3. gmax137

    why BTP RSB 5-1 changed to 5-4

    Does anyone know when/why the Branch Technical Position (BTP) RSB 5-1 (residual heat removal) became BTP 5-4? Or where I can find an explanation of the changes/differences between the former & the latter? Thanks
  4. gmax137

    blowdown and set pressure drift

    I'm trying to understand how steam safety valves work. The ones I'm looking at are large spring safety valves (6 inch inlet, around 800,000 lb/hr capacity) with adjustable blowdown. Now my understanding of blowdown is this: if the set pressure is say 1000 psi, and the blowdown is 5%, then...
  5. gmax137

    tank temperature

    I want to determine the maximum expected temperature of water in a large (350,000 gallon) steel tank. The tank is located outdoors in southern florida. The daily maximum air temperature is something like 91 F, but the tank is exposed to normal sunlight. If it saw a number of bright sunny days...
  6. gmax137

    bias in Crane 410 fitting losses

    Hi all, I'm new to this site. I'm trying to find out if the resistance coefficients for valve and fittings in the Crane 410 paper are biased high or low relative to "reality." I have always figured that they are biased high to ensure that the calculation overestimates the pressure drops, but...

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