capability of the radiator to the initial design requirement via over
sizing, or other compensating methods. Internal surfaces shall be
compatible with liquid fluid coolant used. Materials and coolant are
subject to approval by the Contracting Officer. Heat exchangers shall be
the pressure type incorporating a pressure valve, vacuum valve and a cap.
Caps shall be designed for pressure relief prior to removal. Each heat
exchanger and the entire cooling system shall be capable of withstanding a
minimum pressure of 48 kPa 7 psi and shall be protected with a strong
grille or screen guard. Each heat exchanger shall have at least 2 tapped
holes; one shall be equipped with a drain cock, the rest shall be plugged.
2.6.7.6
Fuel Supply System
Engine fuel supply system shall be factory mounted. System shall include
as a minimum a solenoid shut-off valve, a gas pressure regulator, and
carburetors (including a throttle body assembly) or fuel injectors.
2.6.7.7
Controls Package
The controls for the gas-engine shall be incorporated into the overall
controls package for the liquid chiller. The engine controls shall be
capable of monitoring, displaying, and controlling, as applicable, the
following conditions.
a.
Coolant-fluid inlet and outlet temperatures
b.
Lubricating-oil inlet and outlet temperatures and pressures
c.
Engine run-time hours
d.
Engine current status mode (on/off)
e.
Engine speed
f.
Percent engine load
g.
Engine jacket temperature
2.6.7.8
Exhaust Piping
Exhaust piping installation shall be per the engine manufacturer's
recommendations, except as modified herein. Horizontal sections of exhaust
piping shall be sloped downward away from the engine to a drip leg for
collection of condensate with drain valve and cap. Changes in direction
shall be long radius. Exhaust piping and mufflers shall be insulated in
accordance with Section 15080A THERMAL INSULATION FOR MECHANICAL SYSTEMS.
Vertical exhaust piping shall be provided with a hinged, gravity-operated,
self-closing, rain cover.
2.6.7.9
Exhaust Muffler
Engine shall be provided with a chamber type exhaust muffler. The muffler
shall be of welded steel and designed for [outside] [inside] [vertical]
[horizontal] mounting. Eyebolts, lugs, flanges, or other items shall be
provided as necessary for support in the location and position indicated.
Pressure drop through the muffler shall not exceed the recommendations of
the engine manufacturer. Outside mufflers shall be zinc coated or painted
with high temperature [_____] degrees resisting paint. The muffler and
exhaust piping together shall reduce the noise level to less than [_____]
SECTION 15620A
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