## What hose size is equivalent to pumping through 2-6 inch hoses?

## What hose size is equivalent to pumping through 2-6 inch hoses?

(OP)

I was wondering what size of hose is equivalent to pumping through 2-6 inch hoses? I was told its friction loss is double that of 7 inch hose, so the flow would be the same as 7 inch hose. I did my own calculations and found it to be a little bigger than 8 inch. How do you calculate this setup? Thanks in advance!

## RE: What hose size is equivalent to pumping through 2-6 inch hoses?

Ted

## RE: What hose size is equivalent to pumping through 2-6 inch hoses?

Assuming what you mean is you have the same pressure drop and overall you want the same flow through the system, then the flow rate of one 6" pipe needs to be 0.5 of your bigger pipe.

(0.5)^0.2 = 0.87.

Hence your bigger pipe is 6/ 0.87 = 6.9 ID.

To do it right you need the ID and actual pressure drops/unit length.

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## RE: What hose size is equivalent to pumping through 2-6 inch hoses?

## RE: What hose size is equivalent to pumping through 2-6 inch hoses?

If you take 1500GPM, then your 7 inch hose needs 15 psi per 1/8 mile.

the 6 inch hoses need less pressure drop for the same total flow (750 x 2) at 8.6 psi or for the same pressure drop can flow 1000 gpm each.

The d/d ratio can sometimes get a bit tight at small sizes and the IDs don't exactly match the data provided, but it's pretty close.

If this pressure drop chart is for your actual hoses then go for two 6 inch

Remember - More details = better answers

Also: If you get a response it's polite to respond to it.

## RE: What hose size is equivalent to pumping through 2-6 inch hoses?

## RE: What hose size is equivalent to pumping through 2-6 inch hoses?

Matt

Quality, quantity, cost. Pick two.

## RE: What hose size is equivalent to pumping through 2-6 inch hoses?

Ted

## RE: What hose size is equivalent to pumping through 2-6 inch hoses?

At 1250 gpm:

Headloss in 2 - 6-Inch hose = 6 * 10,560/660 = 96 psi

Headloss in 1 - 7-Inch hose = 10.5 * 10,560/660 = 168 psi

Headloss in 1 - 8-Inch hose = 5.5 * 10,560/660 = 88 psi

It is a good idea to oversize piping as the extra cost to up one pipe size is minor compared to the overall installed cost.

## RE: What hose size is equivalent to pumping through 2-6 inch hoses?

You should look at 9" if available or 10" and run the calculations on material / installation costs and the difference in pump, and pumping costs compared to the 6/8 configurations. Reducing head to the minimum will reduce the pump purchase cost, cheaper electrics (smaller motor, starter and cabling)and something like a 1/3 of the power costs.

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)

## RE: What hose size is equivalent to pumping through 2-6 inch hoses?

If we use subscript 1 for the existing line and subscript 2 for the proposed line then we can express the rule relating the differential pressure (dP) to the diameter (ID) as

dP

_{2}/ dP_{1}= (ID_{1}/ ID_{2})^{5}But this assumes that the flows are the same through the two lines.

In turbulent flow the pressure drop is proportional to approximately the flow squared. We only know the pressure drop through the 6" line with half the total flow. To use the "power of 5" rule above we need to compare the lines with equal flow. If we double the flow in the 6" line the pressure drop (dP) increases by a factor of 4 so we need to rewrite the equation as

(dP

_{2}/ (4 x dP_{1})) = (ID_{1}/ ID_{2})^{5}We want the pressure drops to be equal, so dP2 = dP1 and this simplifies to

0.25

^{0.2}= ID_{1}/ ID_{2}or ID

_{2}= 6" / 0.758 = 7.92"which agrees closely with the values taken from the chart.

Katmar Software - AioFlo Pipe Hydraulics

http://katmarsoftware.com

"An undefined problem has an infinite number of solutions"

## RE: What hose size is equivalent to pumping through 2-6 inch hoses?

If this works better for identical flows I'll bear that in mind the next time I use it.

Remember - More details = better answers

Also: If you get a response it's polite to respond to it.