Recent content by warrenelec

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...

some are UL listed, others not. why?

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...

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

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...

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

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...

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...

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...

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

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...

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...

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...

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

thanks!