Apple Roof Cleaning
Roof Cleaning Instructor
Is Apple Roof Cleaning Right ? Is 3/8 Hose Wrong ? -
If you are contemplating getting into the roof cleaning business, conventional "wisdom" would have you believe that a shurflo 60 psi pump at 1.6 gpm is the "right choice".
This is wrong.
The real reason many don't like the faster 45 psi 3.6 gpm pump is because they are choking it with 3/8 hose.
See For Yourself With This Calculator http://www.connel.com/freeware/flowcalc1.shtml
Always remember, the more GPM a pump can deliver, the more pressure is required to move it through a restrictive hose, and up onto a roof.
This can readily be seen by reading this link, and utilizing the flow loss calculator.
Here is a quote from a pressure loss page """ Remember that with water pipes bigger is always better. You can never have a pipe that is too large, so when in doubt use a larger size! Anybody that tells you otherwise is wrong, and you should be careful when taking irrigation advice from them. You can not "squeeze" more pressure out by using a smaller pipe, in fact the opposite happens and the pressure is reduced. When you place your thumb over the end of the hose to make it spray, you are not increasing the water pressure. The water shoots farther because you are increasing the water velocity. The pressure is actually reduced slightly by your thumb. OK? The principle is referred to as a nozzle effect, and it is what makes a sprinkler spray water over long distances. It's not easy to understand, but please trust me on this, it is correct.""""'
A big hose is always better, always.
It is time for you guys to "un lean" what you have been taught by well meaning, but misinformed people, who are merely repeating what they have been "taught".
The reason the 60 psi 1,6 gpm shurflo 'works better" through a 3/8 hose is two fold.
#1 - it has 15 more psi then the 45 psi pump
#2 - it is only trying to move 1.6 gpm, instead of 3.6 gpm.
As can be seen from the calculator, you are losing a whole bunch of pressure and flow with a smaller hose.
Apple Roof Cleaning has been recommending BOTH the 100 psi shurflo pump, and the 45 psi as well.
We feel that it's nice to have both!
The extra pressure comes in handy on tall roofs, or when you need to really shoot a solution way up there.'
We know from experience that you will wind up using the 45 psi pump most of the time, because it rocks, as long as you use at least 5/8 hose.
There is no need to fear a big hose, and no need for expensive hose either.
5/8 or 3/4 Garden hose, with plastic ends, will take the chemical and pressure just fine.
Just cut the metal parts off, and replace with good quality plastic, and use Teflon tape.
Dont go more then two hundred feet.
The shorter the hose, the less restriction, and the better it will spray.
What I am sharing with you is common knowledge on Most other boards, and it took a while for them to "come around" too.
However, when confronted by the laws of Physics, it was quite hard to 'fight it'.
Sometimes it's hard to 'UnLearn" things, especially when they are perpetuated by well meaning, but misinformed people, like some internet roof cleaning " Guru's ? "
My preacher, when preaching the bible, always ask us to turn to the scripture he is quoting, and challenges us to examine the word.
Before you take anything here in this forum from any "guru", Including Myself, as "Gospel Truth" , I challenge you to investigate for yourself ?
Not only will your pump spray better, it will cycle on and off much less, making it last much longer.
But, like I said, investigate for yourself ? http://www.connel.com/freeware/flowcalc1.shtml
If you are contemplating getting into the roof cleaning business, conventional "wisdom" would have you believe that a shurflo 60 psi pump at 1.6 gpm is the "right choice".
This is wrong.
The real reason many don't like the faster 45 psi 3.6 gpm pump is because they are choking it with 3/8 hose.
See For Yourself With This Calculator http://www.connel.com/freeware/flowcalc1.shtml
Always remember, the more GPM a pump can deliver, the more pressure is required to move it through a restrictive hose, and up onto a roof.
This can readily be seen by reading this link, and utilizing the flow loss calculator.
Here is a quote from a pressure loss page """ Remember that with water pipes bigger is always better. You can never have a pipe that is too large, so when in doubt use a larger size! Anybody that tells you otherwise is wrong, and you should be careful when taking irrigation advice from them. You can not "squeeze" more pressure out by using a smaller pipe, in fact the opposite happens and the pressure is reduced. When you place your thumb over the end of the hose to make it spray, you are not increasing the water pressure. The water shoots farther because you are increasing the water velocity. The pressure is actually reduced slightly by your thumb. OK? The principle is referred to as a nozzle effect, and it is what makes a sprinkler spray water over long distances. It's not easy to understand, but please trust me on this, it is correct.""""'
A big hose is always better, always.
It is time for you guys to "un lean" what you have been taught by well meaning, but misinformed people, who are merely repeating what they have been "taught".
The reason the 60 psi 1,6 gpm shurflo 'works better" through a 3/8 hose is two fold.
#1 - it has 15 more psi then the 45 psi pump
#2 - it is only trying to move 1.6 gpm, instead of 3.6 gpm.
As can be seen from the calculator, you are losing a whole bunch of pressure and flow with a smaller hose.
Apple Roof Cleaning has been recommending BOTH the 100 psi shurflo pump, and the 45 psi as well.
We feel that it's nice to have both!
The extra pressure comes in handy on tall roofs, or when you need to really shoot a solution way up there.'
We know from experience that you will wind up using the 45 psi pump most of the time, because it rocks, as long as you use at least 5/8 hose.
There is no need to fear a big hose, and no need for expensive hose either.
5/8 or 3/4 Garden hose, with plastic ends, will take the chemical and pressure just fine.
Just cut the metal parts off, and replace with good quality plastic, and use Teflon tape.
Dont go more then two hundred feet.
The shorter the hose, the less restriction, and the better it will spray.
What I am sharing with you is common knowledge on Most other boards, and it took a while for them to "come around" too.
However, when confronted by the laws of Physics, it was quite hard to 'fight it'.
Sometimes it's hard to 'UnLearn" things, especially when they are perpetuated by well meaning, but misinformed people, like some internet roof cleaning " Guru's ? "
My preacher, when preaching the bible, always ask us to turn to the scripture he is quoting, and challenges us to examine the word.
Before you take anything here in this forum from any "guru", Including Myself, as "Gospel Truth" , I challenge you to investigate for yourself ?
Not only will your pump spray better, it will cycle on and off much less, making it last much longer.
But, like I said, investigate for yourself ? http://www.connel.com/freeware/flowcalc1.shtml