1: Ensure availability of electricity at
normal voltage and enough water levels.
2: Check oil levels of all running machineries
are normal.
3:. Start cooling water circulation to
Air Compressor and ensure continuous water flow at all outlets.
4: Rotate flywheel of all running machineries
by hand at least one full run for free rotation. Ensure
Expansion Engine Inlet Valve A 13 is closed.
5: Keep the following valve settings:- (Assume drier 'A' on
line)
VALVE OPEN OF NITROGEN OXYGEN ACETYLENE GAS PLANT:
A-1, A-2, A-5, A-14, N-1, N-3, N-6, N-8, N-9, N;.10, 0-4
V4 and V5 to be kept 10 turns open.
VALVES CLOSE NITROGEN GAS OXYGEN GAS ACETYLENE GAS
PLANT:
V3, A-3, A-4, A-6, A-7, A-8, A-9, A-10, VI/1, VI/2, A-12
(optional), A-13, 02,01 N-2, N-4, N-5, N-7, V8, V8A, 0-3,
0-5, 0-6,06, Drain valves & 0-3 & 0-4.
All pressure gauge isolation valves should be kept slightly
open. level Gauge Isolation Valves are to be kept closed.
6: Start the Air Compressor as per Compressor
Manual. After attaining full speed, close the inter-stage
separator drain valves. Close A-2 completely. Close
A-1
partially, watching Air Pressure in P-4, to be about 40
kg. /cm2. Ensure that oil feed to each cylinder is as prescribed
in compressor manual. If oil is feed more than required,
it will form hydrocarbon and cause explosion of distillation
column. Excess air temperature in cylinders also can cause
hydrocarbon formation.
7. Gradually pressurize Molecular Sieve
Drier, which is ready for operation (Assume 'A') through
pressurizing Valve, watching. When P-5 is almost near
P-4,
open Air Inlet A-3 to Drier. Due to sudden pressurizing
and depressurizing Molecular Sieve pellets become powder
and its life will reduce.
8. Now air ready to be admitted to Cold
Box. Open VI/1 slowly watching pressure. Now air will be
blown through drains V6 and V7. Blow the airlines a few
times by closing and opening a VI/1.
9. By Pass valve VI has been provided to
give extra cooling and is gradually closed after the cooling
of the engine starts when T2 _etches (-) 1350 C.
10. Thereafter close VI/1, VII/1, V11,
V6 and V7.
11. Now again open VI/1 slowly watching
Air Pressure in P-1. After pressurizing, open VI/1 fully.
12. Now the Expansion Engine should be
started electrically. Keep the Inlet Valve hydraulic system
lever in 'Stop' position. Oil Pressure in P-15 should be
at least 1 Kgs./cm2. Then release all air locks in hydraulic
system. Keep the Inlet cam in positions. Now put Inlet Valve
to run positions. Now both inlet and outlet valve pestles
should work. Open the air inlet valve A-13, slowly watching
P-7 and P-8 pressure gauges. Then A-13 should be opened
fully.
13. The lower column pressure P-2 also
will go up. During initial start up, the pressure will be
about 3 to 4 kgs./cm2 in P-2 and about 0.4 to 0.5 kgs./cm2
in P-3, upper column pressure.
14.After reaching a steady upper column
pressure in P-3, regeneration should be started to regenerate
off the line drier. After checking drier cycles, heating
should be started.
15. The Nitrogen to the evaporating cooler
should be admitted by opening valve N-2. Valve N-3 must
be closed watching upper column pressure. If there is excess
water in evaporation cooler, it will generate a back pressure
on upper column P-3, which should not exceed 0.6 to 0.7
kgs./cm2. Ensure the Nitrogen Pipe just dips into water.
16. Now watch air pressure in P-1, P-2,
P-3 and in P-4. They should be steady. Slowly increase air
pressure in P-4 by closing A-1 gradually, so that, discharge
pressure in P-4, is about 45 to _O kgs. /cm2. Take care
that P-2 and P-3 does not go up. Also watch heat of expansion
engine cylinder if new piston rings have been used. If it
is warm, reduce air pressure slightly.
17: Now watch temperature, Expansion Engine
Outlet T-2 and Expansion Engine Inlet T-1. These will start
cooling. After about 2 Y:z to 3 hours T-1 will reach -90to
100 Deg.C. And T-2 will reach -140 to 150 Deg. C. (Unto
-165°C is OK)
