jet pump tripping due to rain
DESCRIPTION
In-house Presentation by Team-MateTRANSCRIPT
7/17/2019 Jet Pump Tripping Due to Rain
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CAUSES OF TRIPPING OF JET
PUMPS IN RAINY CONDITION
Presented By:
Shahid Rabbani
Electrical Technician
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JET PUMP PROTECTIONS
• 1. low/high oil level of pump, gear box and
engine.
• 2. Vibration protection of pump and engine
• 3. Force lubrication
• 4. Jacket water coolant level
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PROTECTION SCHEME
• Jet pump control and protected by mostly
Murphy controller TTD.
• 2 types of protection is allowed by TTD,
A- CLOSED LOOP OR NORMALLY CLOSED
CONTACT
In this scheme protective device ( like PSL switch) provide
normally close contact as it operate TTD will shutdown the
machine. PSL switches are sealed and weather proof.
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B. SINGLE WIRE PROTECTION
SCHEME
In this scheme protective device (like oil level
GLG, vibration switches etc.) uses normally open
contact but on side of contact connected to
ground and 2nd side from TTD. As device operate
contact closed to ground and TTD shutdown the
machine.
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CLOSE LOOP CIRCUIT
TTD
N.C
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OPEN LOOP CIRCUIT
TTD
N.O Contact of OIL level
GLG,Viberation switches etc.
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POSSIBLE CAUSES OF FAILURE/
TRIPPING
• 1- Actual operation/ actual fault
• 2- Malfunctioning / false tripping
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CAUSES OF MALFUNCTIONING / FALSE
TRIPPING
1- Ingress of water .2- Ingress of salted dust (mist)
3- Wire Insulation failure due to high
temperature (rarely)4- Wire insulation breakdown due to mechanicalinjury.
5- polluted or moisturized oil that’s respond aslow resistance path (in oil level GLG)
6- TTD faults.
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• Faults due to Ingress of water or mist/dust
are approx. 80% of total false tripping.
• 15% false tripping due to wire insulation
failure or due to moisturized oil.
• 5% false tripping is TTD faults, (relay
malfuntioning,TTD connector strip rusted or
any other wire termination related)
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RECOMMENDATIONS
• We can save 80% false tripping to protect
from water or rain.
• Charging Alternator are commonly and
repeatedly failure reported due to rust or mist
reaction.
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RECOMMENDATIONS
•
Installation of shed on jet pump full skid.• Replacing weatherproof switches with
existing.
• Covering with polythene or fiber glassindividually switches
• Or properly sealed with RTV/silicone onexisting switches (but not durable and
moisture can trap inside and during hightemperature its can rupture and provides pinholes to ingress of moisture or water.
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SHED
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WEATHER PROOF GLG
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NON CLASSIFIED GLG
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ALTERNATOR FALIUREBATTERY CHARGER ALTERNATOR NON
CLASSIFIED
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NON CLASSIFIED LUBRICATOR FLOAT
SWITCH
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NON CLASSIFIED
VIBRATION SWITCH
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NON CLASSIFIED
WATER LEVEL SWITCH
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WEATHERPROOF LUBRICATOR FLOAT
SWITCH
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WEATHERPROOF FUEL GAS SCRUBBER
LSH SWITCH
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WEATHERPROOF
VIBRATION SWITCH
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THANK YOU