When Oxygen Nitrogen Acetylene gas Plant is stopped for short time, either due to electricity
or maintenance or cooling water failure, the start up is
not very lengthy as earlier.
Keep the following starting conditions: (Assume Drier 'A'
on line)
VALVES OPEN FOR OXYGEN NITROGEN ACETYLENE PLANTS:
A-1, A-5, A-13, A-14, N-1, N-3, N-6, N-8, N-9, N-10, V8,
V8A, V4 and V5 3 to 4 turns open depending on length of
shut down.
VALVES CLOSE NITROGEN ACETYLENE OXYGEN GAS
PLANT:
V3, A-2, A-3, A-4, A-6, A-7, A-8, A-9, A-1O, VII/1, V1/2,
A-13, A-14, 02, N-4, N-5, N-7, V8, V8A, 0-5, 0-6 Drain Valves
0-1 to 0-4.
(A-2 valve may be provided in higher capacities only)
All pressure gauges isolation valves should be a lightly
opened and level gauge 'valves are to be opened, start the
Air Compressor after ensuring cooling water supply. Close interstate
drain valves and adjust air pressure in P-C to
about 40 kgs. /cm2 by valve A-1 & A -2
Pressurize drier which was on operation (Assume 'A' by opening
A-7. After pressurizing open A-3 fully and close A-7.After
pressurizing Drier gradually open V1/1 and pressurize Heat
Exchanger watching P-1 pressure. After pressurizing open
V111 completely.
Start Expansion Engine. Set hydraulic system and pressure
properly. Keep cam around 3 positions. Open air inlet valve
A-13 & A-14
Watch P-2 and P-3 pressures. When pressures are normal start
drier regeneration. Start drier heater if required.
Admit Nitrogen to evaporating cooler by opening N-2 and closing N-3.
Watch temperatures T-1 and T-2 when they are -100 Deg.C. 1-90 Deg.C. And 140 Deg.C. Respectively and open V3 valve.
Close V4 and V5 valves watching Upper Column level in L-2 to be within limits.
Check Oxygen Purity after setting V3, V4, V5 valves and Expansion Engine cam settings
When purity is normal start LO. Pump and start filling
cylinders as mentioned earlier.
