Nelson 75 - BIG GUN MATERIALS SPECIFICATIONS; GENERAL; MATERIALS AND CONSTRUCTION; INSTALLATION

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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GENERAL BIG GUN SPRINKLER SPECIFICATIONS (CONTRACTOR)
GENERAL:
The Contractor shall supply full circle, large diameter gun-type rotating impact drive sprinklers as
shown on the drawings. The sprinkler gun shall be supplied with a (n)_____inch taper bore nozzle.
The BIG GUN
®
shall be capable of delivering _____ gallons per minute at an operating pressure of
_____ PSI covering an area of _____ feet in diameter. The trajectory angle for the sprinkler shall be
_____ degrees.
MATERIALS AND CONSTRUCTION:
1.
BodyBody
BodyBody
Body
::
::
: The sprinkler body and arm shall be made of cast aluminum and shall be provided
with a (n) _____ inch female NPT threaded inlet. Vanes shall be provided extending the full
length of the range tube and shall be non-clog design. All wear points or strike areas shall be
made of stainless steel or polyurethane.
2.
Drive ArmDrive Arm
Drive ArmDrive Arm
Drive Arm
: :
: :
: The drive arm shall be equipped with ball bearings at the pivot point and have
a replaceable vaned self-cleaning drive vane. The drive vane shall be self-adjusting to give
consistent drive and arm rate in the full operating range. Ball bearings shall be lubricated and
sealed to eliminate the need of grease zirks and frequent maintenance. The drive arm weight
shall be adjustable to increase or decrease the drive power if desired.
3.
Bearing AssemblyBearing Assembly
Bearing AssemblyBearing Assembly
Bearing Assembly
: :
: :
: The bearing assembly shall be equipped with twin ball bearings to lessen
the strain and wear of the bearing assembly and shall be sealed and lubricated eliminating the
need for grease zirks and frequent maintenance.
4.
Braking SystemBraking System
Braking SystemBraking System
Braking System
::
::
: The braking system shall be a constant friction disc brake extending uni-
formly around the breaking surface. It shall be of the self-adjusting type and shall be fully
shielded to prevent contamination.
INSTALLATION:
The contractor shall follow the manufacturer’s instructions and adjustment of equipment.
MANUFACTURER:
Sprinkler BIG GUN
®
shall be Nelson Model No. _____ .
BIG GUN
®
MATERIALS
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