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  1. mp08

    Mothballing - Air gap vs Blanking

    We are currently working on mothballing a PSM covered plant. When I've done mothballing at past companies, I've always been taught to air gap the equipment in order to call it mothballed in PSM but there is a question if we have to air gap it or if slip/pancake blanks would be adequate. I don't...
  2. mp08

    Which API for blend tank/reactor

    Hello all. I'm working on developing a MIQA program for some blend tanks we have (<5000gal). There is no reaction that occur in these tanks - just adding a bunch of materials and mixing them together and pumping them out. In the past, my company inspected these tanks to STI001 which is for...
  3. mp08

    API vs STI for ASME Coded Vessel

    We have a storage tank with flammables that was built to ASME Section 8/pressure vessel code. We're trying to determine if we should be using API 653 or STI SP001. I know API is more strict, but all of the other tanks at our site are inspected to STI standard. Any suggestions?
  4. mp08

    Breaker Design Correct?

    We had an incident where we shutdown parts of plant by tripping one of our main breakers. Maintenance went to switch a 70A breaker that tripped which caused the breaker. We know the 70A breaker tripped because of a ground fault when we found some wire with no insulation on it. My question is...
  5. mp08

    Facility Siting

    I have to do a facility siting analysis for my plant and was wondering if anyone had any recommendations for an outside resource? I googled Facility Siting and saw a number of companies, but was hoping someone with experience with any of the companies can give suggestions.
  6. mp08

    Remove 1-part of 3-part pressure vessel - Any special considered needed?

    So we have a 'distillation column' that is made up of 3 parts (top, middle, and bottom). The three parts are connected by flanges. All parts are manufactured to ASME VIII and share the same National Board number. We want to run a test where we remove the bottom part and blank off the end of the...
  7. mp08

    PSM requirement around MOC

    I'm currently working on upgrading our PSM system. One of my questions is around when an MOC is needed when updating operating procedures. Right now, there is no procedure on what is needed to create and revise an operating procedure. We've just been writing an MOC each time. My plan was to...
  8. mp08

    Determining Mixing Time in Storage Tanks

    We currently have several large (105m3) final product tanks. Since the plant I work at is a batch operation, we typically have material in the storage tank and once another batch in the reactor of the product is done, we pump it into the storage tank. We then mix the the product in tank simply...
  9. mp08

    How to verify liquid level in tank

    We currently have several large storage tanks with radar level transmitters we are having issues with. The problem is that the level (which we then convert to weight) is never correct. For example, when loading a trailer the level difference has the weight calculation at 41,000 lbs and when we...
  10. mp08

    API 510 for Non-Pressurized Vessel

    We are currently developing an inspection program for my company. We have several reactors that are kept under vacuum/atmospheric pressure. The only pressure is from the raw material pumps into them and the nitrogen blanket, which is only a few inH2O. These reactors were made under ASME Pressure...
  11. mp08

    Conservation Vent Sizing

    Hi everyone. I'm working on evaluating relocating some conservation vents for our equipment that are not in an easy to access area. The inlet piping to the CV would be extended with more a few more bends. I know there are rules around 3% inlet pressure drop for pressure relief valves, but I...
  12. mp08

    When to Perform Fitness for Service Testing

    I'm a chemical engineer at a small and fairly new plant (Opened in 2007). One of my first tasks is to work on the Mechanical Integrity program here as there really isn't any here (no formal inspections done on piping/tanks/vessels, etc just walkby). I came from a larger plant that had these...

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