Dear ce0u1162,

Have a look at:

http://www.ppdairpumps.com.au/hr.html

At least, you have to know the Hr type of the blower.

Alternatively, check the dimensions of your blower and check them against the dimension tables.

If you fail, we can try an estimation.

success

Teus ■

Dear ce0u1162,

I think it is a HR20 blowerat 2700 rpm and 26.8 kW

delivering 656 m3/hr at 1 bar

see:

http://www.ppdairpumps.com.au/hr12.html

BR

Teus ■

Dear Adam,

What else is there to know about a blower?

656 m3/hr displacement

2624 rpm

26.8 kW shaft power

e-motor 30 kW

If you want to know a complete blower curve for a specific rpm with leakage and temperature increase, that can be calculated from the performance table.

Obviously, you are evaluating a pneumatic conveying system.

When you speek of a blower and/or a fan, do you refer to the same equipment?

Have a nice day

Teus ■

Dear Adam,

Is the attached file the information, you need?

Cheers

Teus

Attachments

hr20 (PDF)

■

Dear Adam,

Any other rpm's or ambient conditions are now easily calculated.

let me know.

Cheers

Teus ■

Dear Adam,

Normally, there is a drain plug at each end casing of the blower to empty the lubricant.

In addition, there is either an overflow plug or a level glass for the right amount of oil.

A pressure relief valve is a separate component, located right after the blower outlet.

The setting is determined by the blower type, rpm and motor size.

From the data sheet can be concluded that the maximum pressure should be 1000 mbar.

656 m3/hr displacement

1000 mbar

2624 rpm

26.8 kW shaft power

e-motor 30 kW

See the data sheet in the given link.

I do not know the impeller material, but mostly it is cast iron or cast steel and seldom steel.

However, you can inspect the blower physically.

Best regards

Teus ■

Hello Adam,

Is there not a local ROOTS DRESSER / Holmes rep nearby who can help you figure this out instead you trying to do it on your own? Some applications take special lubricants and some blowers have a common reservoir and some others have common ones. Cheaper models even have greased bearings and not oil splash lubrication. I would play it safe and ask the factory rep for advice. If that does not work then you still have the Forum.

Most European pressure relief valves are spring loaded and carry a data tag on which you should be able to find the setting if not the manufacturer of it. There are a lot of blower packagers out there that use the weight loaded king of valve and those are tougher to set and calibrate as they usually do not carry a tag to begin with. ■

Dear Adam,

The relief valve is (must) be located, close to the blower outlet.

Most likely, the relief valve is clearly visible, when you open the acoustic casing.

It is certainly not necessary to split the blower down to pieces. (see the drawing on the data sheet)

If you open the acoustic casing and take some pictures from different sides and we might be able to indicate the relief valve on those pictures.

Have a nice day

Teus ■

Hello guys,

Please find attached a sketch off of a HR21. It should be closely representative what you are looking at. I marked the PRV location.

Attachments

hr21 (DOC)

■

Dear wojiushiaq,

For the Holmes blower type HR42 visit:

http://www.ppdairpumps.com.au/hr34.html

For the Holmes blower type HR1020 contact:

http://www.ppdairpumps.com.au/index.html

Success

Teus ■

Hello,

The HR42 is a 700mBar max pressure blower for roughly 1800-5600m3/h air flow. Do you want to figure out what the current performance is, or do you want to change the performance?

Ralf ■