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  • Users: Focal
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  1. Focal

    Pump shaft material

    Wow, thanks for all the comments guys. We had a vertical turbine pump in a salt water solution with 416 shaft and it corroded through too. We replaced it with 2205 but it was an approved choice by the OEM. This pump is a different shaft size and I don't know the weight of the impellers. I know...
  2. Focal

    Pump shaft material

    Hello, I have a vertical turbine pump in water service with a 416 SS bowl shaft. It's corroded on all the exposed areas so I'm rethinking material. I'd like to go forward with a 2205 duplex but I'm concerned about the material strength being sufficient. Is there a rule of thumb or quick way of...
  3. Focal

    Pilot PSV Popping far below set pressure

    Thanks for your replies e43u8 and avalveman. We have believed it to be low ambient temperatures because we had so many pops in the winter months. The summer was fine and we have heat tracing on the pilots now, but there have been pops in the evenings (Again lower temperatures). I can understand...
  4. Focal

    Pilot PSV Popping far below set pressure

    Anyone have experience with Pilot PSVs popping significantly below set pressure? I have some in ethylene service that keep popping and not in the other systems. There appears to be some issue with Ethylene and the pilot mechanism. Any ideas on what could be the failure mechanism or how to...
  5. Focal

    Filling a 36' tank efficiently

    So I've learned that the technique is to bottom fill like you've said but in order to keep pressures low it is required to use top fill. The Cryo fluid cools tanks vapors thus lowering pressure whereas bottom fill increases it. A balancing act is done between both fills with bottom being the...
  6. Focal

    Filling a 36' tank efficiently

    Thanks LittleInch, there is a detail that I missed which changes things significantly. It's a Cryo tank holding N2. So the pressure building that occurs changes things. Sorry
  7. Focal

    Filling a 36' tank efficiently

    Hey Guys, I haven't done fluid dynamics for a few years and I am really rusty with fundamentals. What I want to know is if I am filling a tank and I have two options of top fill and bottom fill, how does flow work? To clarify. Let's say the tank is 20% full and thus the height of liquid is...

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