Hand method starts with which finger on which hand?

Thumb / Left hand

For 2.5" hose: Specifically, what does the BASE of each finger represent?

Number of hundreds of gallons:

Thumb: 100 gal

Index: 200 gal

Middile: 300 gal

Ring: 400 gal

Pinky: 500 gal

For 2.5" hose: Specifically, what numbers are assigned to each finger tip?

Even numbers, 2 - 10

for 2.5" hose: What do you do with the numbers on your hand to determine friction loss?

Multiply the number at the tip of the finger with the FIRST DIGIT of the number at the base for your finger.

What does the hand method provide?

An estimation of friction loss per 100' of 1.75" and 2.5" hose

Using the hand method, what is the friction loss for 2.5" hose with a flow of 500 gpm

50 psi per 100'

Using the hand method, what is the friction loss of 400" of 2.5" hose flowing 250 gpm at 100 psi?

50 psi:

(2.5)(5) = 12.5 psi/100'

(12.5)(4) = 50

Using the hand method, what is the friction loss in a 2.5" hose 300' long with 350 gpm flowing?

73.5 psi

(3.5)(7) = 24.5 psi loss/100'

(24.5)(3) = 73.5 psi

For 1.75" hose: specifically, what does each finger represent?

GPM per 100' of hose:

Thumb: 100 gpm

Index: 125 gpm

Middle: 150 gpm

Ring: 175 gpm

Pinky: 200 gpm

For 1.75" hose: GPM increases in increments of ____ between each finger.

25 gpm

For 1.75" hose: the TIP of each finger is assigned what?

1 - 5: Thumb to pinky

For 1.75" hose: the BASE of each finger represents what?

Thumb is 12, all others are 9

To determin friction loss in 1.75" hose, what do you do with the numbers on your fingers?

For the finger assigned your gpm, multiply the number at the tip with the number at the base.

For 1.75" hose: What is the friction loss for 150 gpm?

27 psi/100'

150 psi = Middle finger

tip (3) x base (9) = 27