Dual Delavans

Here's a good post I wanted to revive from PWI back in 3/07

There is a very fine line when operating dual 12V Delavan 5gpm 60psi pumps.

I tried multiple combinations of hose size, length, nozzles, guns and figured out the best combination for running one or two pumps together in tandem.

I talked to Bob with Pressure Tek at the NC round table and he says that the 5850 Delavans are no longer available to adjust to 100psi. They are fixed at 5gpm 60psi.

The most each pump will output under a load (100-200ft 5/8 hose and a #40 nozzle) is 3gpm.

Running 2 pumps together in tandem took some tweaking to get it to double the output to a
maximum of 6gpm.

The slightest little bit of restriction whether it be in the hose, gun, filter or nozzle will cause the dual system to bog down and produce less flow than the maximum of 6gpm.

60psi is not enough pressure to push a full 10gpm. If you want a 10+gpm roof rig,
get a YAMADA KYNAR pump APPLE uses.

Dual Delavans

Hose: 5/8 works for one pump but not two in tandem. 5/8 hose is too small and will cause the pumps to cycle on and off.

3/4 hose is what you need for the dual setup.

Gun: Regular garden guns are too restrictive, so are the poly guns. Best cheap guns I have found are either the high flow twist guns http://www.lrnelson.com/industrial/50503

or

3/4 full port ball valve with adapters to fit a coupler for interchangeable nozzles. Have not tried the expensive accuspray guns.

Filter: Bogs the dual system down too much. No filter recommended.

Nozzles: The #30 or #40 works best for one pump, dual pumps need #60 nozzles at least. 3/8" barbs also work well.

Use the #30/one pump or #60/two pumps for extra reach
Use the #40/one pump or 3/8" barb/two pumps for extra flow

Power Supply: Use a separate strong car battery. At least 700CCA/900CA.
Use short as possible big fat 10 gauge wire and a 60AMP breaker switch so it won't fry.

Mike Sullivan wrote:

Here's a good post I wanted to revive from PWI back in 3/07

There is a very fine line when operating dual 12V Delavan 5gpm 60psi pumps.

I tried multiple combinations of hose size, length, nozzles, guns and figured out the best combination for running one or two pumps together in tandem.

I talked to Bob with Pressure Tek at the NC round table and he says that the new Delavans are no longer available to adjust to 100psi. They are fixed at 5gpm 60psi.

The most each pump will output under a load (100-200ft 5/8 hose and a #40 nozzle) is 3gpm.

Running 2 pumps together in tandem took some tweaking to get it to double the output to a maximum of 6gpm.

The slightest little bit of restriction whether it be in the hose, gun, filter or nozzle will cause the dual system to bog down and produce less flow than the maximum of 6gpm.

60psi is not enough pressure to push a full 10gpm. If you want a 10+gpm roof rig, get a Yamada Kynar pump like Apples.

Dual Delavans

Hose: 5/8 works for one pump but not two in tandem. 5/8 hose is too small and will cause the pumps to cycle on and off.

3/4 hose is what you need for the dual setup.

Gun: Regular garden guns are too restrictive, so are the poly guns. Best cheap guns I have found are either the high flow twist guns http://www.lrnelson.com/industrial/50503

or

3/4 full port ball valve with adapters to fit a coupler for interchangeable nozzles. Have not tried the expensive accuspray guns.

Filter: Bogs the dual system down too much. No filter recommended.

Nozzles: The #30 or #40 works best for one pump, dual pumps need #60 nozzles at least. 3/8" barbs also work well.

GREAT Post Mike
Most have NO idea just how vital large diameter hose is to the performance of a 12 volt pump!
Plese Post this at the RCIA Board, OK ?
It is BS that big hose is "hard to use"

This is a LIE perpertrated by "experts" who USE the big hose themselves, but LIE so their competitors dont know.

I have had some of these "experts" actually CALL and BEG me not to TELL anyone, or they would SMEAR me.

Anyone who has ever tried big diamerter hose knows what we are talking about.

Roof Cleaning aint pressure cleaning.
There is no pulling hose around corners.'
Using big hose is simple, pull all your hose on the roof, and spray.
Easy as that.

You are correct, 60 psi aint much to push 6 gpm, we cant have restrictions!

One day, you will come to my world, the world of the mighty air pump

But the system you have now is THE best for the money invested.

Another advantage with dual pumps is WHEN one pump takes a shit, you HAVE a back up already in line !!


We ALL know pumps mess up spraying what we spray.

NICE to have a back up ?

Mike Sullivan wrote:

Here's a good post I wanted to revive from PWI back in 3/07

There is a very fine line when operating dual 12V Delavan 5gpm 60psi pumps.

I tried multiple combinations of hose size, length, nozzles, guns and figured out the best combination for running one or two pumps together in tandem.

I talked to Bob with Pressure Tek at the NC round table and he says that the new Delavans are no longer available to adjust to 100psi. They are fixed at 5gpm 60psi.

The most each pump will output under a load (100-200ft 5/8 hose and a #40 nozzle) is 3gpm.

Running 2 pumps together in tandem took some tweaking to get it to double the output to a maximum of 6gpm.

The slightest little bit of restriction whether it be in the hose, gun, filter or nozzle will cause the dual system to bog down and produce less flow than the maximum of 6gpm.

60psi is not enough pressure to push a full 10gpm. If you want a 10+gpm roof rig, get a Yamada Kynar pump like Apples.

Dual Delavans

Hose: 5/8 works for one pump but not two in tandem. 5/8 hose is too small and will cause the pumps to cycle on and off.

3/4 hose is what you need for the dual setup.

Gun: Regular garden guns are too restrictive, so are the poly guns. Best cheap guns I have found are either the high flow twist guns http://www.lrnelson.com/industrial/50503

or

3/4 full port ball valve with adapters to fit a coupler for interchangeable nozzles. Have not tried the expensive accuspray guns.

Filter: Bogs the dual system down too much. No filter recommended.

Nozzles: The #30 or #40 works best for one pump, dual pumps need #60 nozzles at least. 3/8" barbs also work well.

Mike, HOW long are these fire hose nozzles lasting ?

Apple Roof Cleaning Tampa wrote:

Mike, HOW long are these fire hose nozzles lasting ?

I don't have this one, the one I have is discontinued.

This new Nelson nozzle has a handle shut off valve, mine does not.

Mine you have to twist it to turn it on and off.

I don't use it much though. I prefer the Banjo poly 3/4" full port valve with a coupler and a three plug nozzle holder. It has a 0060, 1560, and a 3/8" barb on it.

The advantage the Nelson nozzle has is it's indestructable and does not need a coupler with different nozzles. It also comes with a lifetime warranty.

In case you drop and break your 3/4" ball valve, the nelson makes an excellent back-up.
It makes a wand" look like a freaking anal probe, LOL!

You can buy them at Northern Tool & Equipment.

http://www.northerntool.com/webapp/wcs/stores/servlet/product_6970_200332815_200332815

Yeah, hehe. I about pissed myself the day you wrote that poem about the wand stuck up his ass, and please don't turn that ball valve on!

Mike Sullivan wrote:

Yeah, hehe. I about pissed myself the day you wrote that poem about the phelps wand stuck up his ass, and please don't turn that ball valve on!

Yeah, that WAS funny.

LOL! What happened to the "Don ?

Afraid someone's feelings will get hurt? Awwww

Mike Sullivan wrote:

LOL! What happened to the "Don ?

Afraid someone's feelings will get hurt? Awwww

No, just trying to put all that crap behind me.

DUAL FAT BOYS are the new king of 12V pumps.

http://delavanagpumps.com/powerflo/fatboy.htm

I will post my results when I get them installed.

Be careful, a LOT of amps drawn Mike, heavy wire, short as possible, maybe extra batterys ?

I'm using 10 gauge wire currently and a 770CCA/950CA car battery.

Thanks Chris, after doing some research, it looks like I'll need to upgrade my wire to 8 gauge.

Mike Sullivan wrote:

I'm using 10 gauge wire currently and a 770CCA/950CA car battery.

Thanks Chris, after doing some research, it looks like I'll need to upgrade my wire to 8 gauge.

My "Boom Boom" Bass Freak Kid Had dual 15's in a HUGE Box in his Ford Exolporer.
He had dual 2000 watt amps !
One for each woofer.
He got a bigger alternator, DUAL Batterys, and Capacitors.
18 Amps is considerable draw, do you run OFF a Marine Deep Cycle Battery Mike, or just leave Truck running ?

I'm using a separate car battery 770CCA/950CA

It has a lot of juice. That should be enough, you think?

My 20hp pressure washer has a voltage regulator/rectifier that keeps the battery charged. Both the 20hp and the 12V Delavans run off the same battery.

Mike Sullivan wrote:

I'm using a separate car battery 770CCA/950CA

It has a lot of juice. That should be enough, you think?

My 20hp pressure washer has a voltage regulator/rectifier that keeps the battery charged. Both the 20hp and the 12V Delavans run off the same battery.

Not with 18 amps constant draw ?
Maybe time for a deep cycle Marine Batters,. the ones for trolling motors ?

With two FATBOYS it will be double that. Up to 50 AMPS max!

That might drain the battery too fast. I'll look into the deep cycle Marine Batteries.

If I bought another battery same size and wired it parallel with my other one, would that be enough?

Mike Sullivan wrote:

With two FATBOYS it will be double that. Up to 50 AMPS max!

That might drain the battery too fast. I'll look into the deep cycle Marine Batteries.

If I bought another battery same size and wired it parallel with my other one, would that be enough?

Maybe ?
Deep Cycle Marine batterys are cheap here in Florida.
I used two in Parallel for my dual shurflo's, back in the day.
It has been MY experience that any 12 volt pump is a "Toy" compared to what we use.
They may be "rated" at 7 gpm.but they just dont seem to spray like a diapragm pump does.
Plus, they dont last either.
I would rather see you get a Yamada NDP 15 FPS and an air compressor.
It is a Poly Pump, but I used one, and rinsed it out and it lasted a year doing average 3 roofs a day, 5 days a week.
The Kynar version is even better.
It is up to you, but THINK it through good ?