Nitrogen And Accumulator Charging 1f3a41

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Compressed gas safety-- identify & using of LP & HP regulators –

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Procedure/Precautions to charge wheels, accumulators

Cylinder : Nitrogen Cylinder contains Nitrogen of Pressure 2000 psi and is operated by a bottle key LP regulator Identification : one HP gage at outlet of Cylinder one LP gage at inlet of hose HP Regulator : Identification : one HP gage at outlet of Cylinder & one HP gage at inlet of hose For Charging Accumulators & For Cleaning & Charging Tires HP gages ranges from 0 to 4000 psi L P gages ranges from 0 to 1200 psi Hose : Two Types Low Pressure Hose below 1000 psi High Pressure Hose above 1000 psi Operation : Connect the Regulator to the Cylinder with Right hand thread for tightening and then to the hose and Adapter or TPG etc , Always use Teflon tape for the connections so that there should be no leak When all the connections are made , move the bottle key in the direction as Marked on the Nozzle of the Key Adapter and the pressure in the Nitrogen bottle is read in the inlet gage(HP) of Regulator. The valve in the regulator is adjusted ( Clockwise to increase pressure and Anticlockwise to decrease pressure) to get the required output pressure for inflation of any part .

Procedure to Charge an Accumulator

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NITROGEN

CYLINDER

ACCUMULATOR Charging Procedure CAUTION: TO ENSURE CORRECT HYDRAULIC ACCUMULATORS INFLATION, TAKE EXTREME CARE OF DETAILED CHARGING PROCEDURE. FAILURE TO DO SO MAY RESULT IN THERMAL UNBALANCE DURING THE CHARGING ACTIVITY AND MAY AFFECT FINAL PRESSURE REQUIREMENTS. 1. USING THE COMPONENTS OF THE AIR/HYDRAULIC TOOL KIT AND THE PRESSURE GAUGE PRODUCE SYSTEM AS SHOWN ON THE FIGURE. CONNECT THE NITROGEN SUPPLY SOURCE TO THE CONTROL COCK(1). 2. OPEN VALVES "A" AND "B" OF THE CONTROL COCK (1) AND APPLY A LOW NITROGEN PRESSURE TO BLEED THE SYSTEM, THEN CLOSE THE VALVES "A" AND "B". 3. REMOVE THE PROTECTIVE CAP (4). 4. CONNECT THE CHARGING COCK (3) TO THE VALVE(6). 5. LOOSEN NUT (5) ON VALVE (6) AT MAXIMUM ONE OR TWO TURNS. 6. OPEN VALVE "A" OF CONTROL COCK (1).

7. GRADUALLY INCREASE NITROGEN PRESSURE UNTIL THE PRESSURE GAUGE (2) SHOWS 1500 PSI (103.4 BAR). NOTE: THE ABOVE MENTIONED PRESSURE VALUE IS RELEVANT TO A TEMPERATURE OF 20ΔC (68ΔF). 8. THAT THE AIRCRAFT ACCUMULATOR PRESSURE GAUGE SHOWS THE SAME VALUE OF THE ONE INSTALLED ON THE CONTROL COCK (1). 9. SCREW NUT (5). 10.WAIT ABOUT TEN MINUTES TO ALLOW THE NITROGEN TO STABILIZE. 11.REPEAT THE OPERATIONS IF NECESSARY, UNTIL THE REQUIRED PRESSURE IS OBTAINED. 12.TIGHTEN NUT (5) TO A TORQUE BETWEEN 0.5 AND 0.85 DAN.M (3.7 AND 6.3 LBS.FT). 13.CLOSE VALVE "A" OF CONTROL COCK (1). 14.SHUT OFF THE NITROGEN SUPPLY. 15.OPEN VALVE "B" OF CONTROL COCK (1) TO RELEASE THE PRESSURE IN THE CIRCUIT. 16.REMOVE THE CHARGING COCK (3). 17.CHECK THE CHARGING VALVE (6) FOR SEALING EFFICIENCY USING SOAPY WATER. NOTE: CHECK THE ACCUMULATOR PRESSURE GAUGE AT NEXT FLIGHT, A DROPPING PRESSURE RELATED TO EXTERNAL TEMPERATURE DECREASING IS ISSIBLE. IF THE ACCUMULATOR PRESSURE CONTINUES TO DROP, RE-PERFORM THE NITROGEN CHARGING. IF AT NEXT FLIGHT THE PRESSURE IS STILL DROPPING, REMOVE AT THE FIRST OPPORTUNITY THE ACCUMULATOR AND EVALUATE IT.