The tank on my air compressor finally gave up the ghost. The date stamp on the tank is from 1964 so I am really not surprised. It has had a pin hole leak for over a year but it wasnt bad enough to effect my use of it. I stumbed across a replacement tank a few months ago and purchased with the intent of replacing the current tank when I had time. Of course just as I am getting ready to set up my Torchmate table and Hypertherm Plasma cutter the tank gives out.

I stripped the motor and compressor pump off of the failed tank Wednesday night and cut the mounting plates off of both of the tanks so I could mount my compressor and motor to the new tank and everything looks good.

When comparing the ratings on the two tanks is where I run into issues. The old tank has a max pressure rating of 200psi. The shell is .125" thick and the end caps (or whatever you want to call them) are .113" thick. The new tank does not list a max pressure. The only thing I can find is a marking of WP 150. Now I am thinking this means working pressure is 150psi but I am not sure. The shell of the new tank is .115" thick but the end caps are .116" thick. So between the two the newer tank has a thinner shell by .01", which is less than 1/64," but thicker ends caps. I can't imagine that less than 1/64" would make a difference of 50psi but the last thing I need is to pop another tank. Of course this is all dependent on my assumption that WP means working pressure. Since 150 psi is more than I need for any of my tools, I may just get a new pressure switch and blow off valve that are set for 150psi to play it safe, but if someone can give me intelligent input that it will be OK to run the new tank at 175psi I can save myself some money buy not having to buy a new pressure switch and pop off valve.

Anybody know if the WP150 rating on the new tank is a pressure rating or feel confident enough to tell me that the new tank will handle 175psi based on the tank specs. Any help would be apprecited.

I would not exceed stated working pressure.

Why can't you adjust the pressure switch to a lower PSI?

As for the pop-off, leave it for later... and they sell them at Tractor suppy and they didn't look all that expensive IIRC.

JMHO

I would not exceed stated working pressure.

Why can't you adjust the pressure switch to a lower PSI?

As for the pop-off, leave it for later... and they sell them at Tractor suppy and they didn't look all that expensive IIRC.

JMHO

I do not think the pressure switch is adjustable. It is stamped 175psi, no range listed, I know that both styles are available. I am not worried about the blow off valve, those are cheap.

I think I am more interested in knowing if I am interpritting the "WP 150" that is stamped on the tank correctly and it is in fact a working pressure of 150 psi rating. The difference in the consrtuction of the two tanks does not seem to be enough to warranty a 50psi lower rating, but I don't know so I am asking.

Thanks for the help.

http://www.experts123.com/q/what-are-the-differences-between-working-pressure-test-pressure-and-burst-pressure.html

Pic of said regulator?

http://www.experts123.com/q/what-are-the-differences-between-working-pressure-test-pressure-and-burst-pressure.html

Pic of said regulator?

I can't find a picture of the exact pressure switch. It looks like this:
http://www.grainger.com/Grainger/items/2PXJ8?Pid=search

but it has a metal tag on the front of the cover and the on/off pressure is stamped into that tag. Because it is stamped in I am thinking the version I have is not adjustable.

open it up, there is a nut on a stud pressing on a spring. CCW reduces the pressure, CW increases it.

Set the High pressure limit.

Once I have the thing put back together I will try that. I will have to put a good gauge on it and make my adjustments.

Is there a company name at all on the new Tank.

If so track them down and ask.

I see your not that far away

I can't imagine that less than 1/64" would make a difference of 50psi but the last thing I need is to pop another tank.

Increases in pressure are exponential, so "only" 50psi from 150 to 200 isn't something to take lightly.

However, the safety factor is probably three or four times the working pressure.

Personally, I wouldn't take the chance.

lol... the whole thread is us PA country boys...

Warren County...

Is there a company name at all on the new Tank.

If so track them down and ask.

I see your not that far away


Its a DeVilbiss tank. Maybe I can see what I can find out from them.