Nelson 75 - THRUST FORCE OF NELSON BIG GUN NOZZLES

Nelson Irrigation Corp. 848 Airport Rd. Walla Walla, WA 99362-2271 USA Tel: 509.525.7660 Fax: 509.525.7907 E-mail: info@nelsonirrigation.com Web site: www.nelsonirrigation.com
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RISER STABILITY AND THRUST FORCE
2/05
The thrust force for the Big Gun can be calculated by knowing the flow rate through the gun and
the nozzle pressure of the gun. The following equation shows the relationship.
(1)
where, T = thrust force of the nozzle (lb.)
P = nozzle pressure (psi)
Q = flow rate (gpm)
As seen in the diagram above, the thrust force is directly opposite the nozzle exit. Since the thrust force
(T) is now know, the horizontal (H) and vertical (V) thrust force can be calculated using trigonometry.
H = T cos (gun angle from horizontal) (2)
V = T sin (gun angle from horizontal) (3)
The tables below show values of thrust force (T) and horizontal thrust force (H) for the 150 and 200
Big Guns of varying pressures and nozzles sizes.
THRUST FORCE OF NELSON BIG GUN
®
NOZZLES
T = 2P
Q
38 P
erusserP
ISP
elzzoN
"7.0
elzzoN
"8.0
elzzoN
"9.0
elzzoN
"0.1
elzzoN
"1.1
elzzoN
"2.1
elzzoN
"3.1
057384266759211031
065485472921153
1751
07358678801031651381
08068799321841971012
098678111731761202732
0015779421351781422362
01138801631861402642092
02119811941581222862413
T — THRUST FORCE OF 150 BIG GUN NOZZLES (LB.)
( )