11.125.400 Indications – Status and abnormalities.
(a) At Pumping Station. It shall be possible for the operator to check status or find out which abnormality caused a pump to shut down. Indicating lights for status and abnormalities with suitable nameplates and reset buttons shall be provided for this purpose.
Listed below are the required indicating lights (push to test):
(1) At individual pump control panel for each pump:
(i) Status.
1. Discharge valve: closed (amber), open (blue): as applicable.
2. Pump: off (green), running (red).
(ii) Abnormalities.
1. Discharge valve failure (white): as applicable.
2. High bearing temperature (red): for each bearing as applicable.
3. No discharge flow (white): if considered necessary.
4. Excessive vibration (white): if considered necessary.
(2) At the common pump control panel:
(i) Abnormalities.
1. Communications failure from remote sensors (white).
2. Remote sensor in service/failure (red).
3. High pressure shutdown of pumps (white).
(ii) For booster stations with pumped storage, the following additional indications shall also be provided:
1. Reservoir Fill Valve.
A. Fully open (red).
B. Closed (green).
C. Open (amber).
2. Reservoir low level (amber).
3. Reservoir overflow (amber).
(iii) Status indication for any other important valve which will affect the operation of the station shall also be provided.
(iv) Graphic Panel. If the piping and valving connecting the pumping station to the distribution system is complicated, a graphic panel (approximately 24 inches by 48 inches) shall be provided at a suitable location near the motor control center, depicting the main piping layout and location of valves, and incorporating status indication of valves (position indicating lights) and remote control switches for the valves, where required.
A sketch showing general requirements for the graphic panel is shown in Drawing DG-02-13. (The piping configuration and type and location of valves will vary and has to be adapted suitably to suit the pumping station under design.)
(b) At WSSC Control Room. The following status shall be indicated and alarms annunciated at the Control Room:
(1) Status.
(i) In-Line Booster Stations.
1. Each pump.
A. Running (red).
B. Off (green).
2. Altitude Valve at Tanks.
A. Fully open (red).
B. Closed (green).
C. Open (amber).
(ii) Booster Stations with Pumped Storage.
1. Each pump.
A. Running (red).
B. Off (green).
2. Reservoir Fill Valve.
A. Fully open (red).
B. Closed (green).
C. Open (amber).
(iii) The above indicating lights shall be part of pushbutton control stations (combination pushbutton and indicating light operators to be located at the existing control consoles).
(iv) Only indications (no control) are required for altitude valves at tanks served by in-line booster stations.
(2) Alarms.
(i) Pump malfunction: for each pump.
(ii) Telemetering failure.
(iii) One of the following two groups of alarms as applicable:
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Generator running |
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Both feeder breakers open Tie breaker open |
for stations with dual feeds at 480V and automatic throw over scheme |
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Substation Line No. 1 |
for stations with dual feeds at medium voltage and substations DC Trouble |
|
breaker open |
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Substation Line No. 2 |
|
|
breaker open |
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Secondary tie breaker open |
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(iv) Pump room flooded.
(v) Chlorine leak (as applicable).
(vi) Low temperature.
(vii) For booster stations with pumped storage, the following additional alarms shall be provided:
1. Reservoir overflow.
2. High/low discharge pressure.
3. Pressure sensor vault flooding, power failure and telemetering failure: combined as trouble alarm.
(viii) For in-line booster stations, the following additional alarms shall be provided: high/low levels at tank locations.
(ix) An annunciator panel with 18 windows (three across and six vertical) two inches wide and three inches long, with milk-white plexiglass annunciator indicator plates engraved with station name and alarm legend, shall be furnished for installation in the existing vertical panels at the control room. The overall dimensions, appearance and finish have to match the existing annunciators. Existing annunciators are Edward, 14 and one-quarter inches wide and 14 and five-eighths inches high and 12 and one-eighth inches deep, with black finish.
1. Normal: lamp and audible signal off.
2. Alarm: lamp flashes and audible signal on (alarm to be activated by closure of a contact).
3. Acknowledge: lamp steady and audible signal off.
4. Return to normal: lamp and audible signal off. (Amended during 2019 codification; 28-ME-DG-02 § 23.11)