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  1. ATSMech

    Seawater Piping Materials Evaluation

    Just got some revised operational info. The 54" de-watering system will have a chance to drain, and the drainage & sump systems should operate every other day. As we work to renovate the DD (i.e. reduce the leaks), that downtime may increase, but I don't see the stagnant periods being longer...
  2. ATSMech

    Seawater Piping Materials Evaluation

    @EdStainless Worst case answer...no The pumps are about 50 ft below grade with discharge check valves. Pump cases and suction side may drain slightly, but all of the piping and valving on the discharge side will remain flooded. -Aaron
  3. ATSMech

    Seawater Piping Materials Evaluation

    Given the reasons for excluding Cu-Ni, what would be the expected impact on NAB valve bodies and pump cases? I was planning on NAB as we could spec duplex trim and take advantage of the galvanic relationship and area ratios to mitigate corrosion of the trim. Thanks, Aaron
  4. ATSMech

    Seawater Piping Materials Evaluation

    All, Thank you for the continued discussion. After reading about the procedural requirements to ensure the protective layer is properly established in copper nickel, I abandoned the thought of using it. We will not have the option of running clean water through the system at start up, and when...
  5. ATSMech

    Seawater Piping Materials Evaluation

    Thank you for the replies. The more I look into it, the more I am leaning towards GRP. I like the idea of being able to spec different resin systems, as my pump suction diameter will be limited and may run around 15 fps. Given its a dry dock application we are designing around the expectation...
  6. ATSMech

    Seawater Piping Materials Evaluation

    Thank you both for your responses. This has helped validate the conclusions I was starting to come to. On another note, I have read a number of your other posts on similar topics, and I wanted to thank you both for your commitment to a forum like this. It is a great resource. -Aaron
  7. ATSMech

    Seawater Piping Materials Evaluation

    I am working on a materials evaluation and life cycle cost analysis for a project. I have read a fair amount of the threads on the subject, and I have done enough research to thoroughly think myself in circles. I would like to get some opinions regarding my current options. Conditions: Dry Dock...

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