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9

WARNING

   Solvents, such as acetone, used to clean different  pumps 

are extremely hazardous.  Inhalation may be fatal 

or harmful.  Acetone is also extremely flammable. 

Never use acetone near heat or open flame.  

Use only in a well ventilated area.

3.20  Oil Changes and Oil Level

3.201  Developing a Maintenance Schedule

 

After studying many examples of pump failure, Welch has found the most common reason is poor condition of 

 

the oil.  This is why a regular maintenance schedule for the oil is critical to obtain the longest service life out of 

 

your DUOSEAL pump.  Welch recommends that you examine the condition of the oil on a daily basis in the early

  

days of a new process or experiment.  You want to look for discoloration of the oil and whether the oil level is 

 

rising.  The discoloration can indicate deterioration of the oil and a rising oil level can indicate condensation of 

 

vapors is occurring in the pump.  When changes occur, the oil needs to be change.  If no changes in the oil level 

 

or color are observed, extended pump service life is obtained if the oil is changed every three to four months.

3.202  Forced Oil Flushing

 

When you drain oil through the drain valve, you are not removing the oil and contaminants that are inside the 

 

pumping mechanism.  You are removing oil only from the oil case.  Welch recommends a forced oil flush of 

 

DUOSEAL pumps be performed at the regular maintenance oil change.  

 

The procedure for the forced oil flush is given below.

Section 3:  MAINTENANCE

3.10  Vacuum Problems

3.101  Pressure Determinations

 

Leakage, contamination and unusual outgassing are the general causes of problems associated with poor vacuum. 

  

To operate at maximum efficiency a system must be thoroughly clean.  If the system is completely clean and free 

 

from leaks, and unwarranted vacuum problems still exist, the pump should be checked.  A simple criterion for the 

 

condition of a mechanical pump is a determination of its ultimate pressure capability.  This can be accomplished 

 

by attaching a gauge directly to the pump.  The gauge may be any suitable type provided consideration if given 

 

to the limitations of the gauge being used.  Refer to Paragraph 1-8 for further suggestions.  If the pressure is 

 

unusually high, the pump may be badly contaminated, low on oil or malfunctioning.  On the other hand, if the 

 

pressure is only slightly higher than the guaranteed pressure of the pump, an oil change may be all that is required.

3.102  Oil Contamination

 

The most common cause of a loss in efficiency in a mechanical pump is contamination of oil.  It is caused by 

 

condensation of vapors and by foreign particles.  The undesirable condensate emulsifies with the oil which is 

 

recirculated and subject to re-evaporation during the normal cycle of pump activity thus reducing the ultimate 

 

vacuum attainable.  Some foreign particles and vapors may form a sludge with the oil, impair sealing and 

 

lubrication and cause eventual seizure.  A gas ballast calve is helpful in removing vapors, especially water, but it 

 

is not equally effective on all foreign substances; therefore, periodic oil changes are necessary to maintain 

 

efficient operation of the system.  The required frequency of changes will vary with the particular system,.  

 

Experiences with the process will help you determine the normal period of operation before an 

 

oil change is required.

3.103  Oil Overheating

 

This pump is designed to operate continuously below 10 Torr.  Continuous operation of this pump above 10 Torr 

 

will lead to overheating and eventual pump failure.  See Section 2.21, High Pressure Operation.

Summary of Contents for Welch Duoseal 1402C-46

Page 1: ...pump body bursting and causing possible injury to personnel in the area Gardner Denver Inc Welch Vacuum Technology 5621 W Howard Street Niles IL 60714 Phone 847 676 8800 Fax 847 677 8606 Technical Su...

Page 2: ...ons are found where failure to observe the instruction could result in damage to the equipment associated equipment and process These units confirm to the SI International system of units of measureme...

Page 3: ...vel 10 3 30 Shaft Seal Replacement 10 3 40 Repairing Oil Leaks 11 3 50 Repairing Vacuum Leaks 11 3 60 Drive Problems 11 Section 04 Trouble Shooting Guide 4 10 Poor Vacuum Readings 12 4 20 Noisy Pump 1...

Page 4: ...SEAL pumps should be mounted in a horizontal plane 1 122 Unmounted Pumps If you have purchased an unmounted pump refer to parts list for information concerning the motor motor pulley and belt necessar...

Page 5: ...e gas flow is substantially molecular in character The gas flow is then dependent upon the kinetic activity of the molecules to bring it to the intake of the pump 1 162 The Effects of Conductance It h...

Page 6: ...e yourself with the function and action of the pump which you have now required Remove the intake and exhaust port plugs and temporarily provide a stopper for the intake and a dust cap for the exhaust...

Page 7: ...f the volume of the mixture this depending upon the amount of air added condensation of the vapor is wither entirely avoided or substantial reduced 2 223 Pump Function With Gas Ballast In a pump funct...

Page 8: ...rich in hydrogen and observing a sudden change in pressure on an electrical gauge The difference in calibration of these gauges for air and other gases will produce a distinct change in the pressure...

Page 9: ...a system must be thoroughly clean If the system is completely clean and free from leaks and unwarranted vacuum problems still exist the pump should be checked A simple criterion for the condition of a...

Page 10: ...rubber stopper Turn the pump on and run the pump for 10 minutes Close the gas ballast 8 Check the vacuum reading of the pump by connecting a thermocouple gauge tube to the pump s intake If the pump is...

Page 11: ...ng surfaces cleaned of any nicks 3 50 Repairing Vacuum Leaks 3 501 Surface Preparation Good Vacuum seals are an essential and important attribute of a good mechanical pump A good seal is dependent upo...

Page 12: ...t a forced oil flush 5 If noise level is still unsatisfactory consult with WELCH Technical Service at 847 676 8800 Ext 1 4 30 Excessive Oil Mist 1 Check oil level Maintain the level between the two li...

Page 13: ...l Requirements 3 1 Phase Replacement Parts Shaft Seal Lip Seal 1401D 01 Shaft Seal Mechanical Seal 1401D Air Filter Screen 41 0660 Intake Chamber Cover Gasket 41 0234 Oil Case Gasket 41 0403 Drain Plu...

Page 14: ...14 Section 6 DIMENSIONAL DRAWING...

Page 15: ...ange High RPM direct drive vacuum pumps on the other hand experience a rapid fall off of pumping speed below 100 microns A comparison of the DuoSeal pumping speed curves shown below versus high RPM pu...

Page 16: ...tion 8 EXPLODED VIEW 1 46 34 5 24 31 52 53 15 27 46 5 24 51 25 49 30 6 28 12 8 39 29 40 44 35 54 41 42 11 43 45 10 12 50 9 26 28 36 25 33 23 7 55 22 57 56 4 2 16 47 3 32 59 14 13 20 18 17 38 48 58 19...

Page 17: ...5 1 41 2175 SETSCREW 1 4 20 x 2 25 LG 16 1 41 0234 1 1 GASKET INTAKE CHAMBER COVER 46 6 41 2363 WASHER 5 16 ID x 1 2 OD 17 1 41 0403 1 1 GASKET OIL CASE 47 1 41 2757 LOCK NUT 18 1 41 0508 1 1 WASHER T...

Page 18: ...101 Parts List for Model 61 8101 Item Qty P N Description 1 2 61 2229A Oil Window Glass 2 1 61 2278 Drain Valve 3 2 61 2370 Oil Window Cover 4 1 61 8833 Oil Case Machined 5 4 62 1014 Screw 8 32x3 8 Fl...

Page 19: ...onnection kit Cat No 141601 for models1400 1405 1376 1380 1402 Standard Exhaust Filter Use with pump model Dimension Catalog Number Diameter Height Filter Replacement Element 1392 1399 1400 1376 1380...

Page 20: ...Height A2 Cat No 1 NW16 to 4 CFM 140 L min 3 75 5 25 8 25 541001 Stainless Steel Element for ISO NW 16 Trap 1 541921 Stainless Steel Element for ISO NW 25 and NW 40 Traps1 541922 Removable 3 quarter...

Page 21: ...significant adverse health effects are expected to occur upon short term exposure to this product Aspiration of liquid into the lungs can cause severe lung damage or death Eye Contact Minimal eye irri...

Page 22: ...ir Eye Contact Check for and remove contact lenses Flush eyes with cool clean low pressure water while occasionally lifting and lowering eyelids Seek medical attention if excessive tearing redness or...

Page 23: ...ct recovery or disposal Prevent entry into waterways or sewers In urban area cleanup spill as soon as possible In natural environments seek cleanup advice from specialists to minimize physical habitat...

Page 24: ...c vapor respirator equipped with a dust mist prefilter should be used Protection factors vary depending upon the type of respirator used Respirators should be usedin accordance with OSHA requirements...

Page 25: ...product However if spilled this product and any contaminated soil or water may be harmful to human animal and aquatic life Also the coating action associated with petroleum and petroleum products can...

Page 26: ...rd categories No SARA 311 312 Hazard categories identified SARA 313 This product contains the following components in concentrations above the minimis levels that are listed as toxic chemicals in 40 C...

Page 27: ...for Research on Cancer NTP National Toxicology ProgramNIOSH National Institute of Occupational Safety and Health OSHA Occupational Safety and Health Administration NPCA National Paint and Coating Man...

Page 28: ...um Technology and receipt or possession does not convey any rights to loan sell or otherwise disclose said information reproduction or use of said information for any purpose other than that in connec...

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