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5.2.3 Checking the tightness of parts leading ammonia
Even very small leakages become evident with burning sulphur,
which reacts with ammonia forming white mist.
1. Open the container valve and connection valve until the
pressure has reached 3-4 bar, and immediately close it again.
2. If the pressure does not remain constant, there is a leakage.
3. Slowly move a burning sulphur strip along the gas leading
parts.
4. If white mist forms, the header line is leaky.
5. Immediately close the container valves.
6. Depressurise the system: Continue operating the system, until
the measuring tube on the dosing system shows no more gas
flow.
7. Switch off the motive water pump.
8. Eliminate the leakage: For instance tighten the gland in the
connection valve, see 9.1 Leakage at the connection valve, or
tighten the connections of the copper line.
9. Repeat the tightness check.
10. If no white mist forms, the header line and pressure
connection are tight.
11. Open all container valves.
12. Switch on the motive water pump and start the system.
See the Installation and Operating Instructions of the gas
dosing system.
Checking the tightness of the gas dosing system
The tightness of the entire gas dosing system has to be checked.
See the Installation and Operating Instructions of the gas dosing
system.
5.3 Start-up
Warning
Before starting the header line, have its good
condition checked by an expert, see
1.3 Qualification of the users.
Check the tightness only if the entire system is
ready for start-up.
Danger of chlorine gas leakage!
Start-up of the header line has to be done together with the gas
dosing system. See the Installation and Operating Instructions of
the gas dosing system.
6. Operation
The header line doesn't have to be operated.
If no faults occur, for uninterrupted gas extraction after start-up
exchange empty gas containers by full ones in good time.
6.1 Container exchange
1. Shut off the respective connection valve by tightening the lock
nut (1) as far as it will go, in order to avoid gas escape from
the header line.
2. Close the cylinder valve or drum valve.
3. Exchange the empty container by a full one.
4. Connect the full container to the connection valve.
5. Open the cylinder valve or drum valve.
6. Open the connection valve by loosening the lock nut (1) until
at least 3 convolutions (12 to 13 mm) become visible between
the lock nut and the valve body.
7. Check the tightness of the header line, see section
5.2 Checking the tightness.
1
2
Fig. 15 Connection valve
Pos.
Description
1
Lock nut
2
Gland
3
Valve body
12-13 mm
3
11
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