Sizing new Cold Water Unit

B

Bill3752

Member
Whiz, looking for some advice. I have a bunch of machines, including two CW that are key in my biz. Unit one is a 4000 psi/4.8 gpm machine (18HP); unit two uses same 2021 pump but configured for 3500 psi/5.6 gpm (20 HP - I thought the extra HP would increase longevity). Doing mainly brick cleaning with these.
Looking to buy a third machine as backup for 1st two. Would like 4.8 gpm (extra gpm is a problem for me at many locations), and 2500 - 3000 psi would suffice. Guy I purchased 1st two machines from suggested using same 2021 pump with a 13HP Honda to save cost.
Q1 - would 13HP do the job?
Q2 - what is longevity of 13HP vs. twin cylinder 18HP? Is the extra HP worth the price?
Q3 - Is sticking with the 2021 the correct choice (I have been pretty happy with this pump, and do have a spare sitting in a box)?
Thanks.
 
I'm no wiz, but I don't think I would even buy a 13hp machine with a 2021 pump............nor would I buy from someone who even suggested it.
 
i own a 13 hp with a 2021 pump.
it has a tranny on it.
Work's great
bought it used for $300
Start's on a 1/2 pull of the rope.
Get a third hand to keep the trigger open or it can rip your hand off when starting.
I would use the 2021.
As far as engine size. I have a box truck and like to remove the unit for some project's. The 13 hp is heavy enuff for me to lift, forget that 18 hp. You might have a diffrent senerio.
Also fuel consumption,replacement cost's,maint cost's.
 
So is it fair to say that you could never get 5 or 5.6 gpm's out of the 2021 if you only had a 13 hp engine?

At 4 gpm's that pump should last forever............. :)
 
The TS2021 is rated at 5.6 GPM @ 3000 (now 3500 I believe) PSI at 1450 RPM with an 11.3 hp ELECTRIC motor; the newer WS202 is rated at 5.55 GPM @ 2900 PSI at 1450 RPM with a 10 hp ELECTRIC motor.

13 hp gasoline can potentially give you 5.6 GPM @ 2200 PSI IF and only IF this works with the torque curve of the engine and only as a belt drive because the RS-151 does not allow for the pump to turn slowly enough.

Will it work? Yes.

Would I want it too? Maybe, simply because there is no room for error on the engine. I would lower it to 5 GPM at 2000 PSI and probably have a fairly reliable unit. The TS2021 is part of the same family of pumps that includes the 1321, 1511 and 2010; arguably the best pumps that General makes.

Hope this helps? Cheers.
 
Mike H - only am looking for 4.5 - 4.8 gpm, because of flow supply issues we see on most jobs.
Michael - given I will run the unit at 4.5-4.8 gpm and 2500 psi, it appears that the 13HP will do the job? What is best way to check pump curve issue? Wonder if the 1511 or 2010 is a better pump choice? What is a RS - 151???
 
Bill, I think I have the simular machine, 13hp honda ts2021 gear reduction. 4.5@3000. This machine is 6 years old. Repacked the pump a few times and a new k-7 unloader or 2. New rope pull. Just basic stuff. I use it as a backup with or without a hotbox. It has been very dependable. It is kind of ugly now , but it is a work horse.

Michael T
 
Thanks for all your replies. Because I may end up using this new machine every day, all day long, I decided to go with my original design - 5 gpm, 4000 psi. I had some concerns about running the 13 HP engine maxed out all the time.
 
The RS-151 is the gear reduction drive from General Pump for the TS2021 pump. I do not like gear reduction drives at all because they add needless complexity, another crankcase to monitor and/or leak and still have a mechanical connection between the power supply and the pump. Belts allow for a mechanical 'weak' link to protect the components from each other. They also allow for a more effective transfer of power from the source because they allow each part to work at optimal levels.

Running it as I have suggested will not max out the engine but will work it hard. The Honda will survive but it's life may drop from 1500 hours to, I don't know 1200 hours or so or it may not.
 
You must log in or register to reply here.
Back
Top