Darley UHP-HV Specification

Odin Foam Division, W.S. Darley & Company

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Darley UHP-HV Diesel Specification1

This dual pump is designed for either a powerhead type unit or a full module.
The module provides a “self-contained” diesel powered “slide-in” type ultra high pressure / high volume
system (UHP- HV). The system shall be designed to fit into the back of a standard length and width pick-up
truck or fire service body.

The powerhead is to be installed and plumbed by OEM/installer. The powerhead provides diesel driven
volume and pressure pumps. The system is designed to be mounted and finished by installer.

The UHP-HV shall be designed to discharge low pressure water (foam solution option) from one discharge,
or high pressure foam solution (option) from a hose reel (option) or both simultaneously.

Engine

The power to drive the system shall be provided by a Kubota model DH 902, liquid cooled, indirect injection,
naturally aspirated diesel engine. The heavy duty rating for this engine is 24.8 hp @ 3600 rpm. Automotive
engines or ratings will not be used. The power unit shall have re-borable crankcase of grey cast iron.. The
pressure-lubricated engine shall have a 12VDC – 40 amp alternator, glow plugs. A remote oil drain shall be
supplied.

High Volume Water Pump

The low pressure water pump shall be a Darley 2BE single-stage centrifugal pump with a vertically split
aluminum case. It shall have replaceable bronze impeller and seal rings on a stainless steel shaft. The pump
seal shall be of a mechanical design.

High Pressure Water Pump

The high pressure water pump shall be a CAT pump 7CP6170 belt driven plunger pump. The pump shall
incorporate a forged brass head with FPM and EPDM elastomers offering compatibility with a wide range of
foam liquids. It shall be of rugged continuous-duty triplex design capable of pressures exceeding 1400psi.

There shall be built in pressure relief valves to protect the system from over pressure. In addition, there will
be integrated thermal relief valve designed to keep the pump at safe operating temperatures.
All hp pressure lines shall be rated to a minimum of 2000 psi.

Drive System

The high volume water pump is directly driven in line with the engine crankshaft. The high pressure pump is
belt driven from special bell housing sprocket drive. It shall be driven via a dry 2Gates Poly-Chain® drive
system. The complete drive system shall have a 2,000 hour rated service life and shall be designed and rated
for the imposed speed and load.

Electrical System

All electrical equipment installed by the manufacturer shall conform to current automotive electrical system
standards and the requirements of the applicable NFPA apparatus standards. The wiring shall be individually
and permanently color and function coded. The installation shall meet SAE Standard J1128 in its latest
edition for GXL or SXL temperature rating.

All exposed wiring shall run in loom with a minimum of 280°F (137.8°C) rating. All wiring loom shall be
properly supported and attached to frame members along the entire run. At any point where wire or looms
must pass through metal, rubber grommets shall be installed to protect the wire from abrasion.

Specifications are subject to change and improvements without notice

Gates Poly-Chain is a registered trademark of the Gates Corporation, dba The Gates Rubber Company

Odin Foam Division, W.S. Darley & Company

The main low voltage electrical terminal block and circuit breaker panel shall be provided behind the pump
operator’s panel in a location providing easy service access.

The electrical connections shall be made using heat shrink and/or weatherproof connectors. All electrical
circuits shall be protected with ATO blade type fuses.

Priming System

A Darley 12 VDC electric, oil-less, rotary-vane priming system shall be utilized. The primer is capable of
priming the water pump through 20’ of hard suction hose with a 10’ lift. Primer controls and instruction plate
shall be mounted on the operator’s panel.

Plumbing, Hoses and Lines

All piping shall be of galvanized or stainless steel. Uses of grooved end pipe couplings are required for
flexibility and movement of system components on mobile equipment. Flexible piping may be used where
applicable. Drain cocks shall be provided on the water pump and Cat Pump to prevent freeze damage.

Tank to Pump

There shall be a brass two piece 1 ½” tank to pump valve fitted in the module and controlled from
the operator’s panel.

Inlets

A 2½” NH male suction inlet with cap and lanyard shall be provided at the operator’s panel.

Outlets

1. There shall be one 2½” NH water only discharge (optionally foam discharge) with a 2”
valve provided on the operator’s panel. The valve shall terminate in NST threads with cap
and lanyard.

2. A high pressure discharge outlet will be provided for a hose reel.

Tank Refill

A 1½” tank refill line with a 1½” valve shall be provided and controlled from the operator’s panel.

Module Frame

The module frame shall be constructed of aluminum and designed for rigorous fire service use. Aluminum
tubing shall be ¼” thick and be of 6061 or better specification.

Control Panel

The control panel shall be laser cut, 16 gauge, brushed stainless steel. The instruments, indicators and
controls that are located on the control panel / operators area shall be positioned in a logical manner and
clearly marked to provide for simple and easy operation. The following items shall be mounted on the
control panel:

1. Pump Panel Light Cluster

2. Foam or Dual Foam Solution Control Valve (option)

3. Water Only Discharge Valve(optionally foam discharge); 2½” NH Male Outlet

4. Tank Refill Valve

5. Tank to Pump Valve

6. 2½” NH Male Suction Inlet with Cap

7. Prime Valve Controls

8. 2½” Master Low Water Pressure Gauge

9. 2½” Master High water Pressure Gauge

10. Engine Throttle

11. Engine Control
a. Hour Meter / Tachometer