Blower vs HP

[tmdry]

On the chart - "URAI Blower Performance"

http://www.dresserroots.com/documents/UR...-12k84.pdf

How do I know how much HP a blower needs to run a pump and an engine. I'm not talking about a 45 blower, but just in general. How does someone come up w/ the math to determine how many HP's a certain system requires?

On the chart for a 45 blower for example it says:

3600 RPM's - @ 7 Psi - it'll do 369 cfm's & require a 14 HP, is the 14 HP a bare minimum? For the 11 Psi it says it requires 19.8 HP. Since I have a 18 HP I'm just trying to understand how all these things work.

Does the BHP/HP references the HP # of an engine only?

Also, if a larger blower is running @ 1760 RPM's while producing more CFM's than a blower running @ max vac @ 3600 RPM's, will the one at the lower RPM's put less wear on the engine, and also consume less gas?

Thx,
Bill

 

[Larry Cobb]

3600 RPM's - @ 7 Psi - it'll do 369 cfm's & require a 14 HP, is the 14 HP a bare minimum?

The maximum continuous HP you should draw from a typical gas engine is 70% (per the manufacturer).

That means for the required 14 HP . . .

you would need a 20 HP engine (70% x 20HP =14HP).

Larry

 

[bob vawter]

But wouldn't 10% of a 200 HP engine at idle make more sense........?

 

[Duane Oxley]

3600 RPM's - @ 7 Psi - it'll do 369 cfm's & require a 14 HP, is the 14 HP a bare minimum?

The maximum continuous HP you should draw from a typical gas engine is 70% (per the manufacturer).

That means for the required 14 HP . . .

you would need a 20 HP engine.

Larry

You need to add for the pump. For a 45 or 4M, a 25 HP runs noticeably smoother than a 20, when you factor in the pump.

 

[Shawn Forsythe]

But wouldn't 10% of a 200 HP engine at idle make more sense........?

Would you put a Boss 429 engine with a supercharger and nitrous, in a Yaris?

In general, the larger the output, the greater the engine is in terms of displacement, reciprocating weight, and fuel consumption per RPM. This is especially true when talking about engines with a great disparity in output. A bigger engine just plainly creates more absolute parasitic loss that has to be made up with additional fuel. There is also the problems associated with engines that run constantly at low demand. They tend to accumulate more combustion deposits, as they are designed to run more efficiently and effectively at a certain RPM and percentage of load. For a CDS setup, this is much less of a factor since the engine is being used in a dual duty scenario which permits the engine to run at the higher designed RPM ranges, whenever it is driven for transport. While, certain engines which are designed for strict industrial use can sometimes incorporate design characteristics that help it run more efficiently at a single governed RPM, they still have a desirable load and RPM range which is higher than Idle and 10% loading.

 

[bob vawter]

sooooooooo then all that R&D and the development of the Direct Drive was jus .....
hooey?

come on...
saaaaaaaay it!

sorry larr....

 

[Dolly Llama]

come on...
saaaaaaaay it!

sorry larr...

it's alright, Bob ..i'm used to you PLAGIARIZING my material

But wouldn't 10% of a 200 HP engine at idle make more sense.

no



..L.T.A.

 

[Shawn Forsythe]

can you believe it's been over 20 years since he died?

e]http://www.youtube.com/watch?v=hafaW1uLE-4e]