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Welch CHEMSTAR 1374N Owner's Manual

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Never Block the Exhaust Port. If the exhaust is blocked, pressure
will build-up in the pump with the potential of the pump body
bursting and causing possible injury to personnel in the area.
Welch Rietschle Thomas
7301 North Central Avenue
Skokie, IL 60077
Phone: (847) 676-8800
Fax: (847) 677-8606 (Technical Support)
Fax: (920) 451-4397 (Ordering)
E-Mail: welchvacuum@thomasind.com
Web-Page: www.welchvacuum.com
OWNER'S MANUAL
CHEMSTAR
MODELS:
Contents:
FOR
VACUUM PUMPS
®
1374N
1376N
1400N
1402N
Installation
Operation
Maintenance
Warranty
MSDS Sheet For Pump Oil
Specifications
Parts List and Expl. Views
Applications Booklet
WARNING
For outside U.S. and Canada, contact your local
Rietschle Thomas sales office, see back page
Part No. 67-0544R3.2
Printed in USA

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  • Page 1 For outside U.S. and Canada, contact your local Rietschle Thomas sales office, see back page Welch Rietschle Thomas 7301 North Central Avenue Skokie, IL 60077 Phone: (847) 676-8800...

  • Page 2: Table Of Contents

    The Pumps come with ISO NW fitting on both the intake and exhaust ports. The fittings make it easy to use Welch modular piping to connect the pump to your system and allow easy disassembly. For users who prefer to use rubber hose, a rubber hose adapter for the intake fitting is provided.

  • Page 3: Installation

    If you are required to communicate with your dealer or with Welch Vacuum Technology, Inc. be sure to include your order numbers for quick identification. Do not return the pump to the factory without first calling for a returned goods number.
  • Page 4 1.6b Overload Protection Motor thermal overload protection is made available by the motor manufacturer as an aid to minimizing motor failure. Overload protection is a standard feature on all single-phase 60 Hz motors. Single-phase motors will normally have automatic overload protection. Motors of 1-1/2 horsepower or large supplied with DuoSeal pumps contain no overload protection.
  • Page 5 1.8 Vacuum Gauges The type of vacuum gauge to be used is determined largely by the pressure range to be measured. Pressures in the ranges produced by CHEMSTAR pumps can be covered by McLeod, Thermistor, Pirani or Thermocuple gauges. The McLeod gauge is used where high accuracy of measurement is required.

  • Page 6: Operation

    Section 2: OPERATION 2.1 Starting Procedures 2.1a Starting a CHEMSTAR Pump Before attaching the pump to a system it is well to familiarize yourself with the function and action of the pump which you have now acquired. Remove the intake and exhaust port plugs and temporarily provide a stopper for the intake and a dust cap for the exhaust.
  • Page 7 2.4b The Presence and Removal of Condensate Condensation takes place particularly in the compression stroke of the backing or second stage of a two-stage pump. The compression stroke is that portion of the cycle during which the gas drawn from the intake port is compressed to the pressure necessary to expel it past the exhaust valve.

  • Page 8: Maintenance

    Section 3: MAINTENANCE 3.1 Vacuum Problems 3.1a 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.
  • Page 9 3.3 Repairing Oil Leaks 3.3a Location, Cause and Effect Oil leaks may develop wherever two mating faces are sealed with a gasket. Such seams may fail as the result of deterioration of the gasket material, loosening of the screws caused by temperature variations, or improper care as the result of previous reassembly.

  • Page 10: Quick Reference Charts

    Section 4: QUICK REFERENCE CHARTS...

  • Page 11: Pumping Speed Curves

    Section 5: PUMPING SPEED CURVES Vacuum Pump 1400N Vacuum Pump 1376N/1402N Vacuum Pump 1374N HIGH EFFICIENCY PUMPING CHARACTERISTIC OF DUOSEAL® PUMPS The low RPM design of DuoSeal vacuum pumps makes it possible to maintain high puming efficiencies into the low micron range. High RPM direct drive vacuum pumps, on the other hand, experience a rapid fall off of pumping speed below 100 microns.
  • Page 12 Section 6: MOUNTED PUMPS DIMENSIONAL DRAWINGS All Dimensions are in Inches Model 1400N-01 Model 1402N-01 Model 1376N-01 Model 1374N-01...
  • Page 13 Section 7: PARTS LIST AND EXPLODED VIEWS 1400N PARTS LIST FOR ITEM QTY A* B* DESCRIPTION ITEM QTY A* B* DESCRIPTION 2-01-9306 Soc. Hd. Screw 5/16 - 18x3/8 61-8674 Intake Ring 41-2191 Pulley Including Set Screw Item 1 41-1041 Intake Rotor 41-3696 Shaft Seal 41-1063...
  • Page 14 1402N PARTS LIST FOR ITEM QTY P/N A* B* DESCRIPTION ITEM QTY P/N A* B* DESCRIPTION 61-8113C Intake Ring 61-8329A Air Filter Bracket 2-61-0000 Steel Washer 3/16 size 2-01-0316 Hex Head Cap Screw 5/16-18x1 2-31-0112 Hex Steel Nut 61-8382 Union 61-8315A Valve Block Spacer 61-8465A...
  • Page 15 1376N PARTS LIST FOR ITEM QTY P/N A* B* DESCRIPTION ITEM QTY P/N A* B* DESCRIPTION 41-2074 Pulley incl. item 2 2-01-8128 Set Screw 1/4-20x1-3/4 2-01-9306 Socket Head Set Screw 5/16-18x3/8 2-31-0112 Hex Nut 1/4-20x3/16x7/16 1401D-01 Shaft Lip Seal Kit includes items 4 & 5** 61-8314A Block Valve 41-0643...
  • Page 16 1374N PARTS LIST FOR ITEM QTY A* B* DESCRIPTION ITEM QTY A* B* DESCRIPTION 2-01-9306 Set Screw 5/16-18x3/8 61-8362 Soc Hd Screw 8-32x1 41-1492 Pulley incl. Item 1 61-8101A Connector for GB Valve 2-01-6116 Soc Hd Screw ¼-20x1 61-8264B Oil Case Assy. Incl. Items 16, 17,18, 1401F-01 Shaft Seal incl.
  • Page 17 Section 8: MSDS for Welch 8995G Gold Vacuum Pump Oil...
  • Page 20 Section 9: ACCESSORY SECTION Coaxial Traps • Reduces oil backstreaming • Stainless steel construction • Easy replacement of elements ISO Size Capacity Diameter Height Cat. No. NW16 To 4 CFM (140 L/min) 3.75 5.25 8.25 541001 NW 25 To 12 CFM (340 L/min) 5.50 5.25 8.25...
  • Page 21 Welch Rietschle Thomas 7301 North Central Avenue Skokie, IL 60077 Phone: (847) 676-8800 Fax: (847) 677-8606 (Technical Support) Fax: (920) 451-4397 (Ordering) E-Mail: welchvacuum@thomasind.com Web-Page: www.welchvacuum.com Copyright© 1993-2003 Welch Rietschle Thomas CHEMSTAR® is a registered trademark of Welch Rietschle Thomas...
  • Page 22 USING YOUR CHEMSTAR VACUUM PUMP WITH CORROSIVE GASES Thank you for choosing the CHEMSTAR vacuum pump from Welch Vacuum Technology, Inc. This unique vacuum pump line was designed to give you the maximum possible service life when evacuating corrosive gases. However, corrosive gases can cause damage to the most rugged vacuum pump in an improperly configured or improperly operated vacuum system.

  • Page 23: Section 1. Health & Safety

    (1) Less reactive to chemical attack.DIRECTORR Gold is a highly saturated and hydrogenated oi which creates a high purity product. By vacuum distilling off a narrow fraction of this oil, Welch has produced an oil with more single bonds than other oils. Fewer double bonds make it a less reactive oil.

  • Page 24: Connecting Your Chemstar Pump To The Vacuum System

    If the flow of strong acids or halogens exceeds 10% of gas flow, you must switch to a perfluoropolyethers such as Fomblin Y06/6 (Welch Cat. Nos. 1408C-06, 1 Kg; 1408C-08, 2Kg) - Fomblin is a registered trademark of Ausimont. In addition, if ozone is pumped and its concentration exceeds 100 ppm of the gas flow, a perfluoropolyether oil must be used.
  • Page 25 01, the dry ice slurry trap cat. No. is 545001 and for the liquid nitrogen trap the cat. No. is 546001. For model 1374N-01, the dry ice slurry trap cat. No. 545003 and for the liquid nitrogen trap the cat. No. is 546003. Call Welch Technical Service at 847-676-8800 for recommendations on the piping connections need to connect the traps to your vacuum chamber.
  • Page 26 13/16” ID vacuum hose. Welch offers a mist eliminator to pump connection kit to clamp the oil mist eliminator to the pump. The CHEMSTAR pump models 1402N-01 and 1376N-01, the kit-cat. No. 1416E-02 - consists of a NW25 hinge clamp and NW25 centering ring. For 1374N-01, the kit-cat.

  • Page 27: Insuring An Adequate Exhaust System

    (See specific recommendations for various gases in Section 4). If you are planning a new system, Welch recommends you use a pump with a higher capacity than initially calculated if you plan to dilute the corrosive gases.

  • Page 28: Dry Nitrogen Purging Of Oil Case

    The longer the residence time the more the corrosion observed. Welch provides a ¼” compression fitting positioned at the top of the oil case which is connected to a bubbler tube in the oil reservoir. When pumping on corrosive gases, Welch recommends passing 2 to 10 cc/minute of dry nitrogen gas through the oil bubbler at a maximum of 2 PSI.

  • Page 29: Weak Acids: Acetic Acid (Hoac), Carbonic Acid

    5%. If the flow of dry chlorine or bromine cannot be brought below 5% of gas flow but is not above 10%, Welch recommends that our oil filtration system with an alumina element be used (See Section 2 C. for information on the oil filtration system.) If the flow of dry chlorine or bromine goes above 10%, you must switch to a perfluoropolyethers such as Fomblin Y06/6 (Welch Cat.

  • Page 30: Formaldehyde

    100 ppm. A cellulose element should be used with the oil filtration system (See Section 2 C. for more details on oil filtration system available from Welch). If you will be pumping ozone at levels above 100 ppm of gas flow, you must switch to a perfluoropolyethers such as Fomblin Y06/6 (Welch Cat.

  • Page 31: Fragments Of Sulfur Hexafluoride (Sf ) Carbon Tetrafluoride (Cf ) Etc

    If you cannot use in your application a particulate trap because it reduces the pumping speed too much or the corrosive gas attacks the polyester element, Welch recommends the use of an oil filtration system. In addition, some elements will also...

  • Page 32: Section 6. Extending Service Life Of Chemstar Through Proper Maintenance

    CHEMSTAR 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.
  • Page 33 If pumping mechanism cannot be turned by motor, have pump sent into factory repair center. 4. Check ultimate vacuum with thermocouple gauge. (See Section 6 B. Step 8 for how to do this.) If reading is still unsatisfactory, consult with Welch Technical Service after checking for leaks in your connections. B. Noisy Pump 1.
  • Page 34 Welch Rietschle Thomas under this warranty is limited to servicing, adjusting, repairing or replacing any unit or component part which in the judgment of Welch Rietschle Thomas has not been misused, abused or altered in any way causing impaired performance or rendering it inoperative. No other warranties are expressed or implied.
  • Page 36 Skokie, IL 60077 Phone: (847) 676-8800 Fax: (847) 677-8606 (Technical Support) Fax: (920) 451-4397 (Ordering) OWNER’S MANUAL CHEMSTAR VACUUM PUMPS ® MODELS 1400N, 1402N, 1376N, 1374N Part No. 67-0544R3.2 Copyright© 1997-2004 Welch Rietschle Thomas Welch is registered trademarks of Welch Rietschle Thomas...

This manual is also suitable for:

Chemstar 1376nChemstar 1400nChemstar 1402n

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