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  • Users: plastcc
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  1. plastcc

    What's the difference between RHW and RHW-2 insulation?

    Just poking around on US supplier websites it seems to me that the H indicates 75C and the HH indicates 90C. I also found where H indicates 75 C and the "2" indicates 90C. Then I ran into XHHW-2 and now I'm really confused. Anyone know?
  2. plastcc

    Use of HDPE flange connections in buried force main

    Does anyone have experience with buried HDPE force-main flange connections or a suitable design, such as encasement, to protect these joints? The situation is for a 48" and 54" FM project, on steep grades, where it will be difficult to use a fusing machine in the trench. The flange joints are...
  3. plastcc

    Confined space entry- manhole tripod

    My question is regarding the use of the tripod system for manhole entry: Is it acceptable to use the tripod as a primary means of accessing a vertical manhole or is it only meant as a backup safety device for retrieving an injured worker? A "CFR" or some other reference would be helpful.
  4. plastcc

    Methanol Storage Tank Standard

    When spec'ing an AST for methanol storage (WWTP application), what standard(s) apply?
  5. plastcc

    Cast-in-place-pipe for an "egg" sewer. (U.S.A.)

    I have a specification to design a liner for non-circular gravity flow pipe using the beam method. There is no reference to any ASTM or other standard regarding the beam method. Any information on this method would greatly be appreciated.
  6. plastcc

    Dam design calculations

    I've been tasked with designing an oil spill containment. The best design is to build a concrete wall, approx. a foot high, perpendicular to an asphalted slope of about 1:10. My PE says he threw out all of the old concrete design books, and no other references are available or authorized for...
  7. plastcc

    Fire protection pipe marking requirement

    My safety department tells me I need to paint all of my sprinkler pipe red, whether it is in a warehouse or a residential building. The Safety people could not provide a reference for this. What is required to be marked? If using pipe labels, what is the frequency of marking? Please provide...
  8. plastcc

    Sprinkler piping marking requirements

    Where can I find the requirements for marking fire protection piping within various occupancies? I have areas that are covered by all occupancy types, except for "high hazard".
  9. plastcc

    Safe fill height for AST's

    I need help in determining a safe fill height for my #2 fuel oil tanks. They are horizontal, 20,000 - 22,000 gallon tanks built to UL-142 standards. They have a shell thickness of 1/4", an outside diameter of 120", and an outside length of 408 1/2" to 449 5/16". The heads...
  10. plastcc

    Safe Fill Height for AST's

    I need help in determining a safe fill height for my #2 fuel oil tanks. They are horizontal, 20,000 - 22,000 gallon tanks built to UL-142 standards. They have a shell thickness of 1/4", an outside diameter of 120", and an outside length of 408 1/2" to 449 5/16". They are...

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