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  • Users: Rputvin
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  1. Rputvin

    Centrifugal cast iron pump wear rings - switch to brass

    The company I work for has a line of Chinese pumps that we buy as parts and assemble in the US to use in our equipment. They are the generic end-suction, close coupled, cast iron cases and impellers, simple type 21 seals, being put into water/glycol loops in industrial applications, 1hp to about...
  2. Rputvin

    Maintain velocity while reducing cavitation on a gravity return line to a sump tank

    I've got an interesting situation on a customer installation. The system uses a roof-installed cooling tower, being supplied with 1400-1500gpm of warm water (90-105°F). The return is a 12" gravity drain, which terminates slightly above the water level of the 3500gallon sump tank (approx...
  3. Rputvin

    Implementing ASME B31.9 - sanity check and advice

    I'm working on a project that my customer has requested ASME B31 compliance for. The most applicable section is B31.9, the skids we're making are small pump stations that include a few valves, a few feet of pipe spool, and the main plate heat exchanger (ASME U/UM stamped) at the center of two...
  4. Rputvin

    Odd pump behavior - off the curve

    I've got an interesting set of circumstances that is confounding all of the engineers at my company and I'm looking for someone that may have some idea of how to troubleshoot this. Less than a month old, we ran off at our facility, but don't record flow values, only pressure and current on the...

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