Max pressure needed

[fizzy]

I have just bought a combined filter regulator for my big 7.5hp 3 phase Clarke.
I know I should have checked first but it came today and I noticed max pressure is only 123psi or 8.5bar.
Will that be a problem for sandblasting etc? Compressor goes to 150psi.

 

[James1979]

Don’t know about blasting, but as far as the etc goes, workshop pressure is 100-110psi.

Most air tools run below that but no one reads the instructions

 

[optima21]

not a problem if your consumption is less than the amount of air that the compressor can supply. you can probably adjust the cut off switch, but that will have a higher load on the compressor if its switching off at 150 psi rather than 123 psi.

 

[Ross365]

A lot of the budget-priced guns and cabinets have a recommended pressure of 90psi. To get the best out my under-powered compressor, I set the regulator on that the the highest pressure possible, and then have a second regulator in the line just before it goes in the cabinet and that is set to give 90psi while the gun is operating.

 

[MoreWellie]

max pressure is only 123psi

the problem is that you would be using the regulator at 22% over the maximum pressure it is supposed to handle. I expect there is some sort of safety margin but I wouldn't feel happy about using it that much over and if this is for business use you should definitely get something rated to the compressor

If it blows then bits could fly and things get quite noisy

 

[anto44]

Are you sure that's the max safe working pressure the regulator can handle and not the maximum pressure that the regulator can be set to output?
Just a guess as most compressors seem to be set around 150psi from the factory but 90-110 is the standard for tools

 

[fizzy]

Are you sure that's the max safe working pressure the regulator can handle and not the maximum pressure that the regulator can be set to output?
Just a guess as most compressors seem to be set around 150psi from the factory but 90-110 is the standard for tools

Yes it will accept a lot more but that is the most it will output.

 

[anto44]

Yes it will accept a lot more but that is the most it will output.

I'd imagine that pressure will be fine for blasting, it's the flow I'd be more concerned about. Even the biggest blasters will work fine at 90psi as long as the cfm is high enough

 

[fizzy]

I'd imagine that pressure will be fine for blasting, it's the flow I'd be more concerned about. Even the biggest blasters will work fine at 90psi as long as the cfm is high enough

I managed just about before with a 14cfm 3hp compressor. This 7.5hp should be a huge improvement.

 

[anto44]

I'd check the cfm of the regulator and if it's less than 14 cfm then fit two parallel or go for a bigger unit

 

[fizzy]

I'd check the cfm of the regulator and if it's less than 14 cfm then fit two parallel or go for a bigger unit

Reg says it will cope with 4000lpm so should cope no problem.

 

[anto44]

I'd hook it up and give it a try set to max pressure and see how it performs

 

[Mikey D]

Hope it's a decent quality filter/reg e.g., norgren ,Parker etc.
I bought a Clarke one and it was on a high air consumption job the flow rate was rubbish .replaced it with a norgren much better .

 

[mike os]

More and more air kit is going at 8 bar

 

[brightspark]

a half inch machine mart filter will handle 90cfm at up to 125psi no problem. i dont bother using a regulator .pot generaly runs at 125 psi most of the time

 

[fizzy]

As mentioned (on another of your threads?) you won’t get 14cfm @10Bar, from a 2.2kW compressor. But 7.5HP will be an improvement on the 3HP one.

Yes I know they are joking figures bit should be more than double my old setup. I could couple the 2 together I suppose. Will see how it goes.