Page 27 - Handbook of Electrical Engineering

6 HANDBOOK OF ELECTRICAL ENGINEERING

Table 1.5. Subsidiary load schedule for the low voltage process switchboard

Description of load No. of Nameplate Continuous Intermittent Standby
units ratings of power power power
each unit consumed consumed consumed
(kW) (kW) (kW) (kW)
Production area lighting 2 75 150 0 0
Glycol pumps 4 2 4 0 4
Glycol reboilers 2 75 75 0 75
Glycol transfer pump 1 15 15 0 0
Refrigeration compressor 3 160 320 0 160
Deareator vacuum pumps 2 30 30 0 30
Water injection booster pumps 4 90 270 0 90
Deareator chem. injection pumps 4 2 4 0 4
Sea drain sump pumps 1 10 10 0 0
Water inj. chem. injection pumps 6 2 8 0 4
Reclaim oil pumps 2 37 37 37 0
Treated water pumps 2 132 132 132 0
Oil transfer pumps 4 10 30 10 0
Electric gas heating 2 300 300 0 300
HP gas comp. pre-lube pumps 2 5 5 0 5
2 × HP gas comp. auxiliaries 2 — 35 35 100
LP gas comp. pre-lube pumps 2 5 5 0 5
2 × LP gas comp. auxiliaries 2 — 35 35 100
4 × water inj. pump auxiliaries 4 — 70 70 200
Corrosion inhibitor pumps 1 37 37 0 0
Trace heating 2 40 80 0 0

Sub-totals for the switchboard 1652 319 1077
Normal running load for the switchboard = (1.0 × 1652) + (0.5 × 319) + (0.1 × 1077) = 1920 kW

Table 1.6. Subsidiary load schedule for the low voltage utilities switchboard
Description of load No. of Nameplate Continuous Intermittent Standby
units ratings of power power power
each unit consumed consumed consumed
(kW) (kW) (kW) (kW)
Utilities area lighting 2 75 150 0 0
Potable water pumps 2 5 5 5 0
Living quarters feeder-A(on) 1 500 300 200 0
Living quarters hot water pumps 2 15 15 15 0
Control room supplies 1 15 15 0 0
Computer supplies 2 15 15 0 15
Radio supplies 2 30 30 0 30
Instrument air compressor 2 90 90 0 90
Instrument air driers 2 10 10 0 10
Plant air compressors 2 90 90 0 90
HVAC fans 16 11 88 0 88
HVAC main air handling unit 1 30 30 0 0
HVAC standby air handling unit 1 10 0 0 10
HVAC refrigeration unit 1 15 15 0 0
Gas turbo-generator auxiliaries 4 — 100 100 300
Trace heating 2 30 60 0 0
Sub-totals for the switchboard 1013 320 600
Normal running load for the switchboard = (1.0 × 1013) + (0.5 × 320) + (0.1 × 633) = 1236 kW