Apple Roof Cleaning
Roof Cleaning Instructor
Hello everyone, now that we have scientifically shown the losses inherent in using restrictive 3/8 diameter hose,http://forums.thegrimescene.com/showthread.php?t=6371 and http://www.pro-spray.com/sprayingguide.htm - here is an example of the 5/8 hose we strongly recommend for your low psi shurflo pump shop://www.factorydirecthose.com/site/932652/page/388991
One will notice this hose is special!
It is made out of pure Polyurethane!
Polyurethane has EXCELLENT resistance against Chlorine, better known as Sodium Hypochlorite.http://www.beiersafety.co.za/chemica...ance_table.htm
This hose will last a long time, and it is pretty inexpensive.
I just wanted to post this, because several of you have been asking for a Hose Source to equip your little Shurflo properly.
Remember, you still need to either call 1 800 shurflo and order an adaptor to use this larger hose on your 3/8 output, or purchase one yourself from Grainger or Mc Master Carr, etc.
I suggest ordering 2 or 3 of them, just in case they break from bumps in the road, etc.
When you get this hose, simply cut off all the metal ends, and replace with GOOD plastic fittings for corrosion resistance.
One of my past "students" from the Delco board turned me on to this!
We have been using Ag Hose, and it is MUCH more expensive.
He has been using this hose over a year, cleaning at least a roof a day, with NO problems!
He just loves it because it is light, yet plenty strong, and about as "chlorine proof" as you can buy!
I plan to equip the new truck I am building with it, but I wanted to let all of you in on it as well.
For those of you w/o the time to go through the "Hose Debate" thread link I have posted, I have cut and pasted the "argument" for, and against 3/8 Hose below.
This way, you can make up your own mind as to the correct choice.
As far as 3/8" hose 'starving' a 1.8 gpm ShurFlo, absolute baloney! The people at ShurFlo didn't put a 3/8" outlet on that pump just because they felt like it. The larger ShurFlos have larger outlets and you can obviously use a larger i.d. hose on any of them if you so choose. I spoke with a technician at ShurFlo the other day just to pick his mind a bit on what already seemed obvious. If the pump is adjusted correctly (screw on pump head) and the orifice size isn't too small on the wand/gun, there is no reason why the pump should hovercycle or burn itself out.
"This one will require all to pay attention, for once and for all, we are going to put a stop to this 3/8 hose idea.
Just because shurflo put a 3/8 hose fitting on some of it's pumps means little.
The engineers never intended a low psi pump to be connected to 200 feet of 3/8 hose!
Lets take a 45 psi 3.6 gpm shurflo, and take a look at what happens,and how much we lose by crippling our pump with 3/8 hose, OK ? "
The Fluid Flow Calculator
This is your input:
fluid: 10 % solution
fluid temp F: 40F
flow rate GPM: 3.6
pipe size in: 3/8
pipe length ft: 200.00
pipe material: C
These are the results:
velocity ft per second: 6.0462
Reynold's Number: 11699.0414
friction factor fa: 0.0300
friction factor f: 0.0298
head loss ft: 82.3780
pressure loss psi: 36.2326
flow calculator developed by Michael J. Rocchetti PE
Back to the Calculator
"As can clearly be seen, we have just pissed away 36 psi, and we only had 45 to start with!
This is the penalty you pay using 200 feet of 3/8 hose.
Oh, BTW, this is being "kind' to you Don, for these calculations assume PIPE!
Coiled hose has even more loss!"
"Now, look below, and see what happens when we switch to 3/4 hose ? "
The Fluid Flow Calculator
This is your input:
fluid: 10 % solution
fluid temp F: 40F
flow rate GPM: 3.6
pipe size in: 3/4
pipe length ft: 200.00
pipe material: C
These are the results:
velocity ft per second: 2.1703
Reynold's Number: 7009.1924
friction factor fa: 0.0343
friction factor f: 0.0341
head loss ft: 7.2616
pressure loss psi: 3.1939
flow calculator developed by Michael J. Rocchetti PE
Back to the Calculator
"It can clearly be seen that our pressure loss is only 3 PSI using 3/4 hose, compared to 36 PSI using 3/8 hose!
Unfortunately, the hose loss calculator is a free program, and does not have the 5/8 hose selection we recommend as an option, so I had to use 3/4 to make my point.
Bigger hose is better, and it is always better.
One will notice this hose is special!
It is made out of pure Polyurethane!
Polyurethane has EXCELLENT resistance against Chlorine, better known as Sodium Hypochlorite.http://www.beiersafety.co.za/chemica...ance_table.htm
This hose will last a long time, and it is pretty inexpensive.
I just wanted to post this, because several of you have been asking for a Hose Source to equip your little Shurflo properly.
Remember, you still need to either call 1 800 shurflo and order an adaptor to use this larger hose on your 3/8 output, or purchase one yourself from Grainger or Mc Master Carr, etc.
I suggest ordering 2 or 3 of them, just in case they break from bumps in the road, etc.
When you get this hose, simply cut off all the metal ends, and replace with GOOD plastic fittings for corrosion resistance.
One of my past "students" from the Delco board turned me on to this!
We have been using Ag Hose, and it is MUCH more expensive.
He has been using this hose over a year, cleaning at least a roof a day, with NO problems!
He just loves it because it is light, yet plenty strong, and about as "chlorine proof" as you can buy!
I plan to equip the new truck I am building with it, but I wanted to let all of you in on it as well.
For those of you w/o the time to go through the "Hose Debate" thread link I have posted, I have cut and pasted the "argument" for, and against 3/8 Hose below.
This way, you can make up your own mind as to the correct choice.
As far as 3/8" hose 'starving' a 1.8 gpm ShurFlo, absolute baloney! The people at ShurFlo didn't put a 3/8" outlet on that pump just because they felt like it. The larger ShurFlos have larger outlets and you can obviously use a larger i.d. hose on any of them if you so choose. I spoke with a technician at ShurFlo the other day just to pick his mind a bit on what already seemed obvious. If the pump is adjusted correctly (screw on pump head) and the orifice size isn't too small on the wand/gun, there is no reason why the pump should hovercycle or burn itself out.
"This one will require all to pay attention, for once and for all, we are going to put a stop to this 3/8 hose idea.
Just because shurflo put a 3/8 hose fitting on some of it's pumps means little.
The engineers never intended a low psi pump to be connected to 200 feet of 3/8 hose!
Lets take a 45 psi 3.6 gpm shurflo, and take a look at what happens,and how much we lose by crippling our pump with 3/8 hose, OK ? "
The Fluid Flow Calculator
This is your input:
fluid: 10 % solution
fluid temp F: 40F
flow rate GPM: 3.6
pipe size in: 3/8
pipe length ft: 200.00
pipe material: C
These are the results:
velocity ft per second: 6.0462
Reynold's Number: 11699.0414
friction factor fa: 0.0300
friction factor f: 0.0298
head loss ft: 82.3780
pressure loss psi: 36.2326
flow calculator developed by Michael J. Rocchetti PE
Back to the Calculator
"As can clearly be seen, we have just pissed away 36 psi, and we only had 45 to start with!
This is the penalty you pay using 200 feet of 3/8 hose.
Oh, BTW, this is being "kind' to you Don, for these calculations assume PIPE!
Coiled hose has even more loss!"
"Now, look below, and see what happens when we switch to 3/4 hose ? "
The Fluid Flow Calculator
This is your input:
fluid: 10 % solution
fluid temp F: 40F
flow rate GPM: 3.6
pipe size in: 3/4
pipe length ft: 200.00
pipe material: C
These are the results:
velocity ft per second: 2.1703
Reynold's Number: 7009.1924
friction factor fa: 0.0343
friction factor f: 0.0341
head loss ft: 7.2616
pressure loss psi: 3.1939
flow calculator developed by Michael J. Rocchetti PE
Back to the Calculator
"It can clearly be seen that our pressure loss is only 3 PSI using 3/4 hose, compared to 36 PSI using 3/8 hose!
Unfortunately, the hose loss calculator is a free program, and does not have the 5/8 hose selection we recommend as an option, so I had to use 3/4 to make my point.
Bigger hose is better, and it is always better.
