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  1. matkenmd

    Surge Protector / Buffer Between regulator and valves

    So...no formal methods for sizing pulsation dampers?
  2. matkenmd

    Surge Protector / Buffer Between regulator and valves

    I'm trying to size a fluid buffer or surge protector for a small hard piped manifold which has a 1500psi output regulator and a number of small valves. We've experienced (in the past) regulator jacking (rapid open/close cycle) when there isn't enough fluid capacitance in the circuit between the...
  3. matkenmd

    Three Mile Island - Stuck open PORV

    I'm doing some reading on the TMI incident. There were human factors at play, but a critical pilot operated relief valve was also faulted. I've seen this noted in many reports (Rogovin report) as well as all over the net and unfortunately also Wikipedia which everyone references. What I don't...
  4. matkenmd

    Question: Constraining a ship FEA

    Apply a gradient pressure under the waterline driven off the depth from the waterline (.45psi/ft)
  5. matkenmd

    humidity and water ingress sensors for underwater UUV

    The way it's done in work class ROVs is with a pair of bare wires connected to a low power shorting circuit. They're placed in the low points in the electronics housing and send an alarm to operators when they're tripped (by sea water) It's very simple, but very effective. Leaks are usually...
  6. matkenmd

    ASTM E8 and 316L

    For ASTM A240 thick, hot rolled, annealed plate UNS S31603 (316L) What material issues may cause a properly run ASTM E8 to report an estimated Elastic Modulus (Youngs) significantly lower than expected? (28-31Mpsi) What testing issues may cause a good piece of material to show a very low...
  7. matkenmd

    Ferrite Number Testing for Nickel alloys

    I understand the 50/50 split. Our trouble as I understand it (I'm in my design silo, and mfg engr is in their silo), that if you start with 49% ferrite in base material, then weld it, you'll certainly increase the ferrite in the HAZ. It may still top out at 55% but we've bought into a hard 50%...
  8. matkenmd

    Ferrite Number Testing for Nickel alloys

    I have my own question..... We've been trying to put together a weld repair procedure for duplex for a while. Well, not trying, but just suffering without one. A metallurgist consultant recommended that above other criteria, we must ensure that we have no more than 50% ferrite in the HAZ. (We...
  9. matkenmd

    Subsea stainless options

    This is more of a survey than a specific question. I'm curious about preferred material selection for subsea use. In my experience most companies have a small pallet of approved choices for various applications. This pallet is developed over the course of multiple projects, with input from...
  10. matkenmd

    Salt corrosion of welded 316L & 430

    Nylon can be permeable does absorbs a lot of water compared to other materials. A lot more so than urethane or UHMW for instance. Most overmolding I've seen for subsea is done with urethane or gre.
  11. matkenmd

    Laser Cladding Info

    "large" 11-13", blind sealing bores. The addition from current is usually under .010, but I understand we'll be making an undercut and building up so we don't cut through the fusion zone when finishing. Hey, I was the one asking the questions, remember?
  12. matkenmd

    Laser Cladding Info

    I'm looking for input from people who use or have used laser cladding to reclaim or rebuild parts. I have a large high dollar 316L weldment with some sealing bores on it. During final machining or testing the tolerances were blown out of spec. We want to add 316 or something even better perhaps...
  13. matkenmd

    Residual Stress in a Nitronic 60 Forging

    After receiving the part we started cutting our finished geometry. We didn't attempt to work harden by strain or machining stress. The parts are domes of about 18" round so support or shipping isn't a likely source of trouble.
  14. matkenmd

    Is all grade 304 stainless steel the same? What is "A-304"?

    304 is pretty cheap stuff anyway, but from some sources its even cheaper and quality can be a problem. We've had some bad experiences working with products of China, Russia, and some other questionable areas. If your going to buy products from there you're at risk and should increase...
  15. matkenmd

    Residual Stress in a Nitronic 60 Forging

    Actual load testing on the part. Prior to and afterward it spent several hours on the CMM. The part is yielding. Can Nitronic 60 store residual stress? That's question 1. Question 2 is how can I get rid of it?
  16. matkenmd

    Residual Stress in a Nitronic 60 Forging

    I believe I may have a residual stress problem with a forging which becomes apparent only after stress is applied to it and it yields more than anticipated. The material is Nitronic 60 (UNS S21800). Standard practice after forging is solution anneal at 1850°F for a few hours then rapid quench...
  17. matkenmd

    Alternatives to 446 SS

    i prefer thin sheet in fact 20 to 30 gauge would be idea. Welding is not necessary, simply cutout (laser or plasma), and a couple shallow bends. to make sort of a soap dish type shape.
  18. matkenmd

    What is the difference of ocean engineering and marine engineering?

    I think its all semantics anyway. I know folks with Ocean Engineering degrees who feel the need to prove they are as qualified as BSMEs engineering-wise and I'm a BSME who is currently designing a lot of subsea equipment. Stay flexible to maximize career opportunities.
  19. matkenmd

    Alternatives to 446 SS

    I'm looking for some magnetic stainless steel which could be used subsea (5000-15000ft) indefinitely. 430 for example is common but is worse with regard to seawater corrosion than 304. I'm familiar with 446 which is a very high chromium flavor 400. I'm looking for others. Bonus points for a...
  20. matkenmd

    Nitrile Seal Problem

    if you have 3% squeeze and then 3% shrink of course you'll have trouble. How about bumping up the squeeze to 10%, then when you loose 3% for whatever reason, you still have a seal?

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