Specifications

3
- A wash-down 3/4" brass hose bib shall be provided downstream of the control valves,
upstream of the main station isolation valve
4.4 PUMP CHECK VALVES
Pump check valve shall be of the silent operating type that begin to close as forward velocity diminishes and
be fully closed at zero velocity preventing flow reversal. Valve bodies shall be cast from ASTM-126C cast-iron
or better and shall be free from blow holes, sand holes, and other impurities. The valve design shall
incorporate a center guided, spring loaded poppet, guided at opposite ends and having a short linear stroke
that generates a flow area equal to the pipe diameter. Internals shall be machined bronze disc, seat, and stem
guide. Valves shall be sized to permit full pump capacity to discharge through them without exceeding a
pressure drop of 2.5 PSI. Valves 4” and smaller to be pressure rated for 250 PSI, and 6” to be pressure rated
to 150 PSI.
4.5 ISOLATION VALVES
Isolation valves shall be butterfly type with ten position lever for sizes 4" and smaller and gear operators for
sizes above 4". All shall be rated at 200 PSI WOG working pressure. Trim shall include stainless steel stem,
bronze or nickel coated iron streamlined disc, and full faced resilient seat designed to eliminate need for flange
gaskets.
4.6 PRESSURE GAUGES
A pressure gauge shall be located on the discharge manifold for the purpose of measuring regulated,
downstream pressure. Pressure gauge shall be 304 stainless steel case and bezel construction. Gauge shall
be 2-1/2" diameter, liquid filled. Pressure sensing connection shall be 1/4" NPT lower gauge connection.
SECTION 5: U.L. LISTED CONTROL PANEL, LOGIC AND SENSORS
5.1 GENERAL
The pumping station electrical controls shall be mounted in a self-containing NEMA 3R enclosure fabricated
from not less than 12 gauge steel. Door gasket seals shall be neoprene sponge, sufficient to protect interior
components from weather and dust. The electrical panel door(s) shall be constructed from 12 gauge steel with
integral latches.
All external operating devices shall be dust and weather proof. All internal components of the enclosure shall
be mounted on a removable back panel. Mounting screws for components shall not be tapped into the
enclosure wall.
All internal wiring within, and interconnecting between, the panels shall be complete and no field wiring within
the panels shall be required. Wiring troughs and cable raceways shall be self-contained within the enclosure
and no external cable trays or wiring roughs are permitted.
No pressure gauges, pressure switches, water activated devices, or water lines of any sort shall be installed in
any electrical control panel.
The control panel shall be designed, built, tested and U.L. listed by the pump station manufacture.
The pump station discharge pressure shall be regulated to provide surge-free constant pressure as
programmed via the control panel operator interface. The control system will have the following features:
a. Gradual entry of water from the pump into the discharge manifold to allow for
complete purging of air to eliminate pressure surging.
b. Maintain programmed downstream pressure regardless of discharge flow.
c. Up to six, user adjustable PID control settings to ensure accurate pressure regulation
at all flows, programmed pressure, or connected pump combination.