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  1. nucleareng78

    NFPA 12 interpretation for CO2 supression

    CO2 suppression skids come with a lockout valve on the main CO2 discharge line but not on the pneumatic horn. I understand the pneumatic horn is fed by CO2 to warn those in the enclosure CO2 is present prior to releasing the main isolation valve discharging CO2 (time delayed valve). NFPA 12...
  2. nucleareng78

    Time to heat up lube oil tank

    We are filtering these rectangular lube oil tanks and want to use the skids to heat up the oil during cold startup. I pulled out the old Heat Transfer book but I think I'm over thinking this. If we are taking cold oil out from the bottom of the tank, heating it (specific temp.), and discharging...
  3. nucleareng78

    System curve determination

    There is a large diameter vertical pipe with a high flow rate. The flow is going from north to south and we are taking a smaller diameter horizontal line off the side of this pipe. My question: how do I begin to draw a system curve for the inlet of the line we are taking off the large diameter...
  4. nucleareng78

    Pump base designs

    Trying to get pointed in the right direction about bases used for pump skids. I will first start by saying I am a mechanical engineer but with high interest in structural. I know most pump skids use a concrete pad to anchor too. Problem is that we want to use a 8" concrete pad and then mount a...
  5. nucleareng78

    Centrifugal Pump Bases

    We have a 900 rpm pump and are wanting to re-do the piping so that we have 5 feet of suction piping before it hits the impeller (let the flow settle out). The problem is, in order to get that 5 feet we need to raise the pump's suction level pretty high (around 2.5-3 feet). We are considering a...
  6. nucleareng78

    Convering inches of oil to NIPA

    I have a positive displacement pump at the top of a tank with a suction piping going into it. I know the oil operating level and have determined that the suction piping is 5 inches under the normal operating level. My question is how do I convert the 5 inches of oil level to Net Inlet Pressure...
  7. nucleareng78

    Lube Oil Cooler, unecessary?

    We are installing a Pall lube oil purification skid that will remove particulates, free water, and dissolved water. Each tank is around 600 gallons and our skids will operate as kidney loops. The existing system uses a filtration skid (only some free water removal) and a oil cooler that uses a...
  8. nucleareng78

    Expansion Joints with FPS pipe

    Some of the pumps I am replacing currently have expansion joints. Does anyone have some good resources on why we should use expansion joints? The pumps' suction operate under a slight vacuum and the system engineer told me there may be some flashing going on at the impeller....this indicates to...
  9. nucleareng78

    Pump RPM to achieve flow

    I am a fairly new engineer and have a pump replacement project. The pumps we are using are Hayward Gordon screw centrifugal pumps and I need some help on the pump curve. After reading the pump curve (matching the design flow and head), I found that it should operate at 750 RPM. After getting a...
  10. nucleareng78

    Plan 1 seal, flushless?

    I've been having a hard time understanding terminology regarding mechanical seals. Difference between flush water and seal water? I have a pump that will be processing seawater and am planning to go with a John Crane Type 1 seal. The question is whether or not we need external flush water (from...
  11. nucleareng78

    Negative NPSH?!

    Talked to the system engineer of a plant and he informed me that there is actually a vacuum at the suction side of this centrifugal pump we are dealing with. I can't seem to grasp my mind around how this can be possible. Since all pumps have a NPSHR, how they heck can you size a pump when they...
  12. nucleareng78

    Screw Centrifugal Pump concerns

    We're dealing with a condenser tube cleaning system that runs while the circulating water system is running. The current pumps are screw centrifugal pumps (yes they exist) and the overhanging load from the 35 lb impeller seems to have some concerns. Biggest design flaw with this pump brand is...

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