Air supplied respirator problems need advice...

td466 · Aug 21, 2020

Hello
I have a SAS air supplied respirator, 3/4 pump with 10 cfm, I'm trying to paint in 80 degree weather, and after about 20 mins when the pump gets warmed up, the air gets really hot, very uncomfortable, so I tried making an a cooler where I got some hose coiled up inside with ice and water, helps but not like I thought it would, when the air is cool I have no issues with smelling fumes, but when it gets hot it seems to come in the exhalation valve, the outside of the mask where the valve is located is covered in paint, not sure why, mask seals excellent all over. I checked my mask when I was done for leakage and there was none, and I checked my air supply to the mask and it was 7 cfm, which should be lots, any ideas why its not working? I got a chemical taste in my mouth today and want to get problem resolved.
My intake is located in a clean area, no fumes are coming in there.

Stephen Newell · Aug 21, 2020

That might work temporarily but I think the rear problem is the pump is wearing out and generating heat. I think your efforts would be better spent replacing the pump. Another possibility is if you've made a change and are operating the pump on an extension cord or anything that might starve the pump for power.

td466 · Aug 22, 2020

The pump is only a year and a half old, its plugged directly into a recepeticle.

Stephen Newell · Aug 22, 2020

I can't find specifications on that model as far as amperage. With a 3/4 hp motor if the receptacle is 15amp it still may be starved for power especially if the receptacle is a long distance from the breaker box. You might try running the pump on a different outlet closer to the breaker box and see if it gets hot there too. At least maybe it might tell you if there is a problem with the pump or your wiring. Being 1 1/2 years old doesn't mean anything anymore. All these companies are competing to make the cheapest junk they can.

td466 · Aug 23, 2020

my book says its 8.3 amps, had an electrician hook things up so it should be right, tried other receptacle does same thing.
so should it always blow cool air? even when its hot outside? this one is an oil less vane pump sold by sas safety, what is the one you would recommend?
my outlet hose length is 50'
to ensure I get clean air, I have to run and extension hose on my intake of 75'. the book says you can run up to 200' of intake and 50' outlet, I seem to be well under that, or this the problem for it heating up the air?

Stephen Newell · Aug 23, 2020

You can understand any motor warming up a little if it's run for a long time but not to the extent you are describing. 80 degrees isn't hot though. You shouldn't be experiencing any noticeable heat coming from the unit. If it was really hot and you had the pump sitting in the sun then you could understand it but not under normal use. From what you are describing I would have the service people for the pump look at it. They may be able to solve the problem before it does any real damage to the motor.

An oilless pump would be correct for an air supplied. It's the oil which is bad for human consumption, otherwise you could just use the air off your air compressor.

Destroked 450 · Aug 23, 2020

Googled your pump to see what you have, seems to be important that filters and the carbon vanes be serviced regularly, any time a pump has to work harder to pull air in or push it out the result will be hotter air.
You said it a 10 cfm pump that's putting out 7 cfm to the mask, where's the other 3 cfm going.

Stephen Newell · Aug 23, 2020

Found something else you might try. If the outlet pressure is above 11 psi it can cause a pump to run hot.

showcrop · Aug 23, 2020

200 feet of intake sounds very long unless it is three inch diameter. Are you sure that you don't have intake and discharge lengths reversed?

44 massey · Aug 24, 2020

What brand system do you have???? I have a Breathecool and have painted in 90 degree heat with no problems and I use 50ft hose from pump to mask!!!! Even with the pump setting outside in the heat I have no problems with it blowing hot air, actually it feels cooler, I use 1/2 face mask!!!!

td466 · Aug 24, 2020

this is sort of embarrissing but my pressure relief valve nut was loose and it has backed off the valve, the book says to not close off pressure relief valve completely, so does that mean to not turn it all the way in? How do you when your at max cfm?

Destroked 450 · Aug 24, 2020

Generally on a low pressure system like that I plug off the supply hose and adjust the regulator to the 10 psi max recommended setting.

Air supplied respirator problems need advice...

td466

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Stephen Newell

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td466

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Stephen Newell

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td466

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Stephen Newell

Well-known Member

Destroked 450

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Stephen Newell

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showcrop

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44 massey

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td466

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Destroked 450

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