ESAB PRECISIONMASTER Mode D'emploi page 7

SECTION 2
2.0 USE OF PRECISIONMASTER GAS SAVER "ACCUMULATOR" (P/N 0558007079) WITH
EXISTING PIPELINE FLOWMETERS OR MOUNTED DIRECTLY ON A PIPELINE CONNECTION
The patented ESAB PrecisionMaster Gas Saver improves weld start quality and reduces shielding gas waste.
The "Accumulator" is a key part of this patented system. At the weld start it delivers extra gas needed to purge
the torch nozzle and weld start area of moisture laden air. It does this at a controlled flow rate to avoid mixing
air into a turbulent shielding gas stream. This is accomplished with a surge flow control orifice at the feeder end.
While welding, the flow rate is controlled by a flow control orifice located at the "Accumulator" inlet and the
gas pressure set in the gas delivery hose. To assure uniform pressure in the gas delivery hose it is best to use a
regulator mounted at the gas source, either cylinder or pipeline. That gas pressure should be maintained above
the 23 to 25 psi for normal flow rates to retain automatic flow compensation as restrictions caused by spatter,
torch hose bends, etc occur in production. Maintaining this minimum pressure is why most gas delivery systems
operate above 25 psi and have since the invention of the TIG and MIG process.
Although it is best to use the "Accumulator" with a pressure regulator there are optional installations that may
be used.
2.1 ALTERNATE USE ON PIPELINE - WITH DIRECT CONNECTION
The "Accumulator" can be connected to a gas delivery hose that comes directly from the pipeline without the
use of a regulator or flowmeter. The flow will then be controlled by the pressure set in the pipeline. The variable
pressure control is the system regulator that regulates the pipeline pressure. If that pressure can be controlled
accurately when gas is flowing to only a few as well as when all welders are operating, the flow will remain con-
sistent. This requires large pipe sizes or high flow regulators located prior to the manifold that contains the gas
outlets.
The table below shows the flow that will be established with various pipeline pressures.
Pipeline Pressure
psi
30
32
35
40
45
50
55
60
NOTE: If pipeline pressure varies the flow will vary as defined in the table.
The PrecisionMaster Gas Saver assembly has no replaceable parts other than the inlet Filter
Screw (P/N 998311). If damaged beyond use, a complete assembly must be ordered (P/N
STANDARD PRECISIONMASTER GAS SAVER
Argon
CFH
31
32
35
39
42
44
47
50
NOTE:
0558007079) .
7
25% CO
2
CFH
30
32
34
38
41
43
46
48
OPERATION
CO
2
CFH
29
31
33
37
40
42
45
46