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  1. warrenelec

    Viscosity of API 22?

    Hi, I need to know what the approximate viscosity of API 22 oil would be. there are limited resources on the internet that i can find. Is it similar to #6 oil where the viscosity can vary widely? I apologize if this is a dumb question, but I am not in the industry. any help is appreciated...
  2. warrenelec

    Class 1 Div 1/2 enclosure question

    some are UL listed, others not. why?
  3. warrenelec

    Class 1 Div 1/2 enclosure question

    i am working on a new design for an electrical termination box for an resistance element heater. i am using a killark box rated as explosion proof suitable for class 1/ div 1 hazardous areas. the box has a 2" NPT opening in the back of it & a 3/4" NPT opening on the side for rigid conduit...
  4. warrenelec

    Tank Freeze Protection Heat Losses/NFPA help

    zapster - the -10 degrees number is the worst case one day temperature based on isothermal charts in the nfpa book, but it is the suggested practice to use those numbers in the design for fire protection tanks. i suppose i should play it safe and use the larger heaters
  5. warrenelec

    Tank Freeze Protection Heat Losses/NFPA help

    Hi, I have received quotes for electric heaters to freeze protect a large water holding tank. One suggetsts a 25 KW (approx 85000 BTU/hr loss) heating requirement & one a 90 KW (approx 307000 BTU/hr loss)heating requirement. it is a 36' diameter x 40' high tank on a concrete slab w/ R-10.2...
  6. warrenelec

    NEC question re: resistance heating elements

    TurbineGen, Thanks for the input - thats what I was afraid of!
  7. warrenelec

    NEC question re: resistance heating elements

    Yes, thats correct - 460/3 phase power. The specs for the unit were given to the manufacturer by our engineer who no longer works here. the unit was purchased 3 years ago and is to be installed now; we are unsure if this design is acceptable and need clarification to determine if this will...
  8. warrenelec

    NEC question re: resistance heating elements

    good afternoon, I have an electric resistance water boiler heater rated at 420 KW inside of an ASME vessel. Power is divided into 12 circuits drawing 44 amps each which is acceptable according to NEC 422.11(F) (circuits subdivided into < 48 amps/circuit - code listed below for reference). The...
  9. warrenelec

    Bulb &amp; Capillary Thermostat for -40 deg Ambient

    Hello, I need to find a bulb & capillary thermostat to control a heater in a hydraulic reservoir (to maintain about +60 degrees F). This will be used in a control box where the ambient temperature could go as low a -40 degrees F (military application). Does anyone know where to find a...
  10. warrenelec

    Freeze Protecting Open top Tank

    I'd prefer not to buy the ASHRAE manual for a one time project. I'll try the swimming pool losses-thanks for the idea
  11. warrenelec

    Freeze Protecting Open top Tank

    Hi, I need to keep an OPEN TOP water tank from freezing & need to determine the approximate heat loss per unit area. (Minimum ambient temperature is 0 degrees F & I'd like to maintain 42 degrees f). I can calculate the losses through the walls of the tank but not the top-I have one chart for...
  12. warrenelec

    Cord grip for bulb &amp; capillary thermostat

    thanks, i.m not really sure what "one off" is but really all i care about is if the thermostat is going to stay dry inside of the box, essentially making it a nema 4 "style" box...i don't need any agency approval but it does need to work...
  13. warrenelec

    Cord grip for bulb &amp; capillary thermostat

    Hi, using a remotely mounted bulb and capillary thermostat for a project. Thermostat is in a NEMA 4 box, but the bulb & capillary will be run through a 3/4" screw tight coupling outside of the box to a tank...i need to seal around the capillary to keep moisture out of the box. I was thinking...
  14. warrenelec

    Ammonium Acetate/deionized water and 316ss

    Hi, Looking to heat up a solution of ammonium acetate/DI water solution in a n agitation tank...is 316SS acceptable? Operating Temp is 95 deg. C?(will be passivated & electropolished). Thanks
  15. warrenelec

    Crude Oil w/ Vanadium &amp; Sodium

    thanks!
  16. warrenelec

    Crude Oil w/ Vanadium &amp; Sodium

    Hi, Designing a heating unit to raise the temperature of #6 oil containing sodium & vanadium to about 265 deg F. Will carbon steel corrode under these conditions or should 304 stainless be used for the construction? Thanks
  17. warrenelec

    Material selection - Electric HX

    I am working on a system that will require a resistance heating element to aid in freeze protecting a seawater tank. There is no flow (static fluid). I need to slect a sheath alloy to be directly immersed in the fluid. The available materials are 316SS, 316LSS, Incoly 840, Incoloy 800, and...
  18. warrenelec

    DIN Flange Standards

    Thanks heier; this page shows a shape B and shape T options for pressure numbers 6-40. I am using 100 x PN 16 flanges; it notes that shape T is "bigger to DN 65" - does this mean any flanges above DN 65 will have a raised face (i.e. a "dg" dimension)?
  19. warrenelec

    DIN Flange Standards

    Appreciate the help, but I need to know if the flat face or raised face flange is the standard for a DIN 100 x PN 16 flange & I can't find anything on those websites. Most of our work is done using ANSI flanges and i'd prefer not to buy a DIN standards book for a one time project. We'd omly be...
  20. warrenelec

    DIN Flange Standards

    Hi, I am quoting a piece of equipment for a customer who only has a drawing of the part that they will need (existing system in europe). The spec shows a flange that is a DIN 2527 (100xPN16 304SS flange). I can't find much on the internet...does this have a raised face or a flat face? If...

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