US VACUUM RP50B-WS Installation And Operation Manual Download Page 12

12 

START-UP

 

 

1)  Be sure the suctions lines are free of foreign matter and perfectly tight. Use inlet protection screens or drop-out traps 

on new installations where large welded piping is employed. 

2)  Make sure the pump discharge is not obstructed 

3)  Check that the cooling water is connected to the pump and available (if operated as water cooling) 

4)  Check belt tension. Deflection should be 1/2” at the center (midway) span of the belt 

5)  Check the oil level and adjust if necessary 

6)  Ensure that the oil line solenoid is wired correctly and oil is flowing 

       

CAUTION: If the oil flow indicator ball does not rise, stop pump immediately. 

                         - Check operation of solenoid 
 

            - Check oil lines for blockage 

6)   Check for correct rotation of the pump. 

7)   Ensure the suction line is not under vacuum (at atmospheric pressure) 

8)   Close the vent valve if one is used 

9)   Start the pump 

10) Turn on cooling water and adjust flow according to previous instructions 

11) Adjust gas ballast as required 

STOPPING THE PUMP 

 

To stop the pump: 

1)  Close the isolation valve in the suction line 

2)  Vent the pump to atmosphere thru vent valve or gas ballast valve 

3)  Stop the pump 

4)  Turn off cooling water 

 

NOTE: Venting the pump prior to shutdown returns the lubricating oil in the pumping chamber back to the oil reservoir 

and prevents the pump from rotating backwards. Failure to follow proper shutdown  

Procedures can result in both hydraulic and vacuum locking the pump and possibly causing pump  

damage. 

 

GAS BALLAST 

 

The gas ballast valve is a manual valve located on the endplate. The valve introduces atmospheric air into the pumping 

chamber to aid in removing condensable vapor contaminates from the vacuum pump oil.  Vapor contaminates in the 

pump oil can dramatically impair the pump performance by vaporizing during the low pressure section of the pumping 

cycle thereby preventing gas from being drawn into the pump. 

 

Isolate the pump from the system and fully open the gas ballast valve and run the pump overnight. 

If this is not possible, partially open the valve during operation and run until oil is clean. 

 

CAUTION: Gas ballast should NEVER be used  if vapors being pumped are explosive, (ie: methane gas, hydrogen and certain solvent vapors) 
                   When gases of an explosive nature are being handled, the safest procedure is to remove the gas ballast valve entirely  
                   and plug or cap the pipe to which the gas ballast valve is attached. 
 

Opening the gas ballast valve slightly will quite valve noise when pump is blanked-off. 

 

SOLENOID VALVE 

 

The solenoid valve feeds oil from the upper oil reservoir to the pumping cylinder via an oil line feeding each endplate. 

The solenoid is N.C. (normally closed) and is used to keep oil in the upper reservoir from draining into the pump cylinder 

when the pump is not in operation, thereby preventing oil from filling up the cylinder. Restarting the pump with the  

cylinder filed with oil can cause hydraulic lock and damage to the pump.  

 

Make sure to check the voltage requirements on the solenoid and that it is wired accordingly. Low or incorrect voltage 

will cause the valve not to open and lead to a loss of oil lubrication to the pump causing severe damage to the pump. Hot 

smell or smoke from the solenoid is cause for investigation. Do not energize the coil when it is removed from the valve 

body, this will cause the coil to fail. 

 

 

Summary of Contents for RP50B-WS

Page 1: ...Rotary Vacuum Pump INSTALLATION OPERATION MANUAL US VACUUM PUMPS LLC P O BOX 909 CANTON TX USA 75103 TEL 888 416 7366 FX 877 416 7599 EMAIL USVACUUM EARTHLINK NET WWW USVACUUMPUMPS COM WARNING DO NOT...

Page 2: ...al systems including heavy Current Voltage installations Depending on the operating conditions particularly where dangerous conditions may be present improper handling could lead to severe personal in...

Page 3: ...or excessive exposure to oil mist or process materials from the discharge of the pump Do not discharge the pump into a closed room or a room without adequate ventilation Always use a discharge oil mi...

Page 4: ...TY PRECAUTIONS Page 2 INTRODUCTION Page 4 PERFORMANCE SPECIFICATIONS Page 6 DESCRIPTIONS Page 7 GENERAL INFORMATION Page 8 START UP Page 10 TROUBLESHOOTING Page 11 PARTS LIST EXPLODED VIEWS Page 15 WA...

Page 5: ..._____________________ Oil Type________________________________ Serial No ____________________________ Operating Vacuum________________________ Startup Date__________________________ Inlet Gas Composit...

Page 6: ...loading no pressure difference is required to operate this valve The outlet discharge valve is opened automatically by the compression of the air or gas in the pump against atmospheric pressure plus...

Page 7: ...densable vapors from the gas stream The RP 50B WS has been specifically designed to operate in these types of applications where water vapor contamination can cause reliability and longevity issues wi...

Page 8: ...cooler Control the water flow so the discharge temperature is between 95 110 deg F when incoming water is between 50 70 deg F Where the water is ex tremely cold control the flow so the pump runs just...

Page 9: ...clean vacuum installation C Standard threaded piping however is satisfactory and more readily installed The piping should be Carefully cleaned to remove any scales or chips Blow out any loose material...

Page 10: ...to the full load motor current listed on the nameplate Wire the solenoid valve to allow oil flow from the pump oil reservoir to the pump bearings internals AFTER ELECRICAL CONNECTIONS HAVE BEEN MADE...

Page 11: ...Generation On seal oil vacuum applications large amounts of water vapor is often distilled out of the seal oil from the degassifiaction tank with the water vapor entering the seal oil vacuum pump The...

Page 12: ...ospheric air into the pumping chamber to aid in removing condensable vapor contaminates from the vacuum pump oil Vapor contaminates in the pump oil can dramatically impair the pump performance by vapo...

Page 13: ...the oil and the gases being pumped White milky oil is an indication of water contamination use gas ballast to clear oil or change oil Water can also be removed by draining water from the pump oil drai...

Page 14: ...king Remedy Tighten if necessary Possible cause Exhaust valve not sealing Remedy Disassemble and clean if necessary Possible cause Threaded connections leaking Remedy Paint with vacuum sealant Possibl...

Page 15: ...exhaust side or expels oil droplets from the exhaust Possible cause No exhaust filter in place Remedy Install exhaust filter Possible cause The exhaust filter is not properly seated with the o ring in...

Page 16: ...16 RP 50B PUMP PARTS 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22...

Page 17: ...PIN 5 ENDPLATE A 6 ENDPLATE B 7 SHAFT 8 SHAFT SEAL HOUSING 9 BUSHING 10 WOODRUFF KEY 11 SNAP RING 12 13 O RING 14 DISCHARGE VALVES 15 VALVE COVER 16 VALVE COVER GASKET 17 HOLD DOWN PLATE 18 GASKET HO...

Page 18: ...tems must be held for seller s inspection and returned to sellers Ex works point upon request THERE ARE NO WARRANTIES EXPRESSED IMPLIED OR STATUTORY WHICH EXTENDS BEYOND THE DESCRIPTION ON THE FACE HE...

Page 19: ...19 NOTES...

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