Howden Roots RAS-J Whispair Installation, Operation & Maintenance Manual
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Howden Roots RAS-J Whispair Installation, Operation & Maintenance Manual

10”-20” splash lubricated blower
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Roots* RAS and RAS-J
Whispair* Blower
10"-20" Splash Lubricated
Installation Operation & Maintenance Manual

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Summary of Contents for Howden Roots RAS-J Whispair

  • Page 1 Roots* RAS and RAS-J Whispair* Blower 10”-20” Splash Lubricated Installation Operation & Maintenance Manual...

  • Page 2: Table Of Contents

    Use recommended accessories for operating protection. Roots products are sold subject to Howden Roots general terms of sale and warranty policy; contact your nearest Howden Roots office for more information. RAS and RAS-J WHISPAIR Blowers...

  • Page 3: Operating Characteristics

    Operating Characteristics From this chamber, two or more slots open back into the two alternately closed pocket areas of the cylinder (shown The Roots air blowers described in this manual represent as A and B). These slots, at certain impeller positions, both the basic type of Roots Anti-friction System (RAS) allow discharge pressure to bleed into the normally low rotary lobe arrangement and the proprietary Roots RAS...

  • Page 4: Operating Limitations

    Before making any change in blower capacity or operating considered as the general temperature of the space around conditions, contact the nearest Howden Roots office for the blower. This is not outdoor temperature, unless the specific information applying to your particular blower. In all blower is installed outdoors.
  • Page 5 RAS and RAS-J WHISPAIR Blowers ILRB-3000 GEA20261 Page 5 of 33...

  • Page 6: Installation

    Installation and all other exposed surfaces with Nox-Rust X-110 or equivalent. Supervision of the installation by a Howden Roots service engineer is not usually required for these units. Technicians 3 Seal the inlet, discharge, and vent openings. It is not...
  • Page 7 general discussion that is intended to be supported by dimensions provided on the certified installation information from the Compressed Air and Gas Handbook drawing. To obtain a bolt location tolerance of 1/8-inch referenced earlier. To ensure satisfactory equipment (3mm), use drilled templates firmly secured to the operation, the concrete foundation must be rigid, have foundation forms.
  • Page 8 Consult your Howden nuts down snug, but not tight. Roots sales office before belting these units.
  • Page 9 For specific piping should be sized so that air velocity in the line does silencer recommendations, contact your nearest Howden not exceed 100 feet per second (30 m per second). When Roots sales office.
  • Page 10 • 0.105 inch diameter for 20-inch pipe Discharge piping requires a pressure relief valve, and should also include a suitable pressure gauge and a • 0.120 inch diameter for 24-inch pipe manually operated unloading valve. The unloading valve For 30” and 36” pipe use 1 mesh backing cloth with a permits starting under no-load conditions.

  • Page 11: Lubrication

    Lubrication excess overflowing into the gearbox primary sump. Inboard sealing of the shafts is the same as at the drive end. In a Separate Opposite Gear End Reservoirs horizontal style blower, the gear end lubrication arrangement is identical, except that a secondary sump is Roots blowers use a simple and reliable splash lubrication formed around each gear and the total oil capacity is more system.

  • Page 12: Operation

    The opposite gear end sumps use constant level oilers. To fill the sumps, remove the top glass reservoir. Fill it with oil, place it on its holder, and let the bottle empty to fill the sump. To obtain proper oil level in the sump that is toward the center of the sight glass (90), pull out the level adjuster (A) shown in Figure 6 and raise or lower the cross-arm (B) as needed.
  • Page 13 TROUBLESHOOTING CHECKLIST before contacting After completing the check list items above, the blower the nearest sales office for Howden Roots is ready for trial operation under “no-load” conditions. recommendations. RAS and RAS-J WHISPAIR Blowers ILRB-3000 GEA20261...

  • Page 14: Safety Precautions

    Safety Precautions Preventive Maintenance When working with any of the equipment mentioned in this Daily manual, it is important to observe safety precautions to • Record the following: reduce chance of injury. The following safety considerations are particularly important: − Lube oil pressure (if applicable) •...
  • Page 15 • Check the coupling alignment, inspect the coupling for wear, and repack with fresh grease. • Inspect oil cooler tubes, as applicable. • Check all protective switches for proper set points and operation. • Check v-belt drive condition and tension. Note: A preventative maintenance schedule should be established for drivers and all accessories in accordance with the applicable manufacturer’s recommendation.
  • Page 16 RAS and RAS-J WHISPAIR Blowers ILRB-3000 GEA20261 Page 16 of 33...

  • Page 17: Maintenance/Replacements

    Rotary Lobe Blower Vibrations Blower vibration levels should be monitored on a regular basis. Take measurements at the bearing locations on the housings and refer to the chart below for guidelines on assessing the vibration severity of a rotary lobe blower rigidly mounted on a stiff foundation.

  • Page 18: Tables

    Major repairs not covered in this manual are considered beyond the scope of maintenance, and should be performed by Howden Roots personnel. Refer to the nearest Howden Roots sales office as listed on the last page of this manual. Do not attempt to repair failures covered by warranty, unless specific approval has been obtained through a Howden Roots sales office before starting the work.
  • Page 19 B - Installing Gears with Gear Locking Assemblies 1. Apply Neverseez paste on the gear locking device screw threads, under the screw heads, on the tapered rings, on the collar tapers, and on the gear hub outside diameters. 2. Slide each tapered ring collar and the web clearance holes and screw them loosely into the opposite collar. Note: Do not tighten the screws at this time.
  • Page 20 2. Degrease the gear bore and shaft taper. Note: All surfaces must be free of oil. 3. Screw the inside ring onto the shaft and snug it up against the gear by hand. 4. Slide the outside ring onto the inside ring. 5.
  • Page 21 C - Timing the Impellers 1. Disconnect the piping at both the inlet and discharge flanges of the machine. Note: Move the pipe flanges at least far enough away for easy insertion of an arm into the openings. 2. Use a set of feeler gauges with blades about 12 inches (300 mm) long for measuring clearances between the impeller lobes.
  • Page 22 E - Replacing Lip Seals (RAS/RAS WHISPAIR) 1. Check the shafts for a surface finish of 10-16 micro inches (.3 to .4 micrometers) root mean square (RMS) in the seal contact area. Also ensure that they are in good condition at the bearing locations. Carefully remove any burrs or sharp corners, but do no attempt to refinish them.
  • Page 23 RAS and RAS-J WHISPAIR Blowers ILRB-3000 GEA20261 Page 23 of 33...
  • Page 24 F - Performing the Final Assembly 1. Install all of the bearings, making sure they are tight against the respective shaft shoulders. Work on the gear end bearings first and press them into place using a suitable length of tubing in contact only with the inner races. The impellers will be driven against the opposite headplate.
  • Page 25 RAS and RAS-J WHISPAIR Blowers ILRB-3000 GEA20261 Page 25 of 33...
  • Page 26 Impeller Clearances The instructions related to impeller clearances described in Operation C and D do not include the amount of clearance to be expected. For blowers in good condition this information is not essential in field service work. However, if a situation occurs in which it would be helpful to compare existing clearance to original values, Table 8 or 9 lists the ranges of values used in original factory assembly.
  • Page 27 RAS and RAS-J WHISPAIR Blowers ILRB-3000 GEA20261 Page 27 of 33...
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  • Page 32 RAS and RAS-J WHISPAIR Blowers ILRB-3000 GEA20261 Page 32 of 33...
  • Page 33 At the heart of your operations Howden people live to improve our products and services and for over 150 years our world has revolved around our customers. This dedication means our air and gas handling equipment adds maximum value to your operations.

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