Soosan SB70 - 8. N2 Gas Charging Procedures; Inspection and Charging of N2 Gas at Back head

Soosan H
y
draulic Breaker
Soosan Heav
y
Industries Co.
,
Ltd
8. Inspection and Charging of N
2
Gas at Back head
Charging gas pressure changes according to the rod condition.
Lay down the hammer and let the rod extend fully to charge gas.
Stay clear of the rod while charging the breaker with gas.
The rod may be impacted by the piston and forced out abruptly, when the through bolts are changed or
the breaker body is disassembled. Discharge N
2
gas before work.
Take special care to handle and store the N
2
gas cylinder as it is high pressurized container.
Use nitrogen gas only.
Back head gas pressure 6kg/㎠ (85.5psi) on the back head surface temperature at 20℃(68℉)
See “CONVERSION TABLE FOR CHARGING N
2
GAS PRESSURE TO BACK HEAD”
■ Inspection of N2 Gas Back Head
1) Make sure if the cap and valve of the 3-way valve assembly(5) are fully tightened.
Screw the 3-way valve assembly(5) into the charging valve of the back head after removing the plug.
2) At this time the handle must stand up to prevent the gas from coming out.
3) Push the handle into the charging valve fully, so the gas pressure inside the back head is indicated on
the pressure gauge.
4) When the gas pressure is normal, unscrew the 3-way valve assembly after discharging gas inside the
3-way valve assembly.
5) When the gas pressure is higher or lower, charge it as described below.
■ Charging of N2 gas into Back Head
1) Connect the charging hose(4) to N2 gas cylinder(1) after screwing the bombe adapter(3) onto adapter
nut(2) and installing them to the N2 gas cylinder.
2) Connect the 3-way valve assembly(5) to the charging hose(4) after unscrewing the cap on the 3-way
valve.
3) Install the 3-way valve assembly(5) to the charging valve of the Back Head. At this time the handle of
the 3-way valve assembly must be up position to prevent the gas from coming out.
4) Push the handle of the 3-way valve assembly fully and turn the handle of the N2 gas cylinder
counterclockwise gradually to charge gas.
5) When the gas pressure exceeds 10% higher than the specified pressure, close the N2 gas cylinder by
turning the handle clockwise.
6) Leave the handle of 3-way valve assembly up. Generated pressure makes it return back to original
position naturally.
7) In order to discharge N2 gas in the charging hose(4) and the 3-way valve assembly turn the relief
valve counterclockwise.
8) Remove the charging hose(4) from the N2 gas cylinder(1) and the 3-way valve assembly(5), and screw
the cap into the 3-way valve assembly.
9) Push the handle of the 3-way valve assembly fully, and the gas pressure inside the Back Head is
indicated on the pressure gauge. When the pressure is higher, discharge a small amount of gas from
the Back Head by repeatedly opening and closing the valve and then gas pressure falls to the specified
pressure.
10) When the gas pressure reaches to the specified pressure, close the valve and release the handle.
11) Open the valve completely and discharge gas inside the 3-way valve assembly.
Remove the 3-way valve assembly from the charging valve of Back Head and install the plug to the
charging valve. At this time prevent contamination from entering the breaker.
WARNING