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Howden Roots RAS Whispair, Инструкция по установке, эксплуатации и обслуживанию

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ILRB-3000 GEA20261

 RAS and RAS-J WHISPAIR Blowers

 

Page 26 of 33 

 

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. Clearances may 
change in service, but they should never be less than the 
minimum values listed. 

Only well qualified personnel should attempt to measure 
clearances for comparison with this data. 

 

 

ILRB-3000 GEA20261 RAS and RAS-J WHISPAIR Blowers.pdf   26

03/09/2015   13:21:27

Содержание Roots RAS Whispair

Страница 1: ...www howden com Roots RAS and RAS J Whispair Blower 10 20 Splash Lubricated Installation Operation Maintenance Manual ...

Страница 2: ...quate safeguards against accidents to persons working on or near the equipment during both installation and operation See SAFETY PRECAUTIONS Install all equipment correctly Foundation design just be adequate and piping carefully done Use recommended accessories for operating protection Make sure both driving and driven equipment is correctly lubricated before start up See LUBRICATION In event of t...

Страница 3: ... of reasonable inlet or discharge pressure variations To change the capacity it is necessary to change the speed of rotation or vent some of the air The Roots RAS WHISPAIR Operation of the proprietary Roots RAS WHISPAIR blower is represented in Figure 2 Just as in the standard Roots RAS blower the air flow is from right to left with the lower shaft rotating clockwise This design differs from the b...

Страница 4: ... temperature rises higher than those listed in applicable Table 1 However you must request specific approval from the nearest Howden Roots office before doing so otherwise the warranty will be voided Normally when a blower is operated at the design conditions stamped on its nameplate the specified limits apply Pressure The pressure rise between blower inlet and discharge must not exceed the figure...

Страница 5: ...ILRB 3000 GEA20261 RAS and RAS J WHISPAIR Blowers Page 5 of 33 ...

Страница 6: ...ation of the connected system Nox Rust VCI 10 may be obtained from Daubert Chemical Co 2000 Spring Rd Oak Brook IL 60521 2 Paint the shaft extension inlet and discharge flanges and all other exposed surfaces with Nox Rust X 110 or equivalent 3 Seal the inlet discharge and vent openings It is not recommended that the unit be set in place piped to the system and allowed to remain idle for extended p...

Страница 7: ...tion All piping requires flexible sections and supports to reduce connection strains on the unit We also do not recommend the direct use of structural framing members for mounting the blower base to a building structure If this is unavoidable it should be restricted to smaller frame size units and spring type mountings should not be used Structural members must be rigid and will probably require r...

Страница 8: ...ctly under the driver feet before setting the unit in place to achieve more accurate final alignment Establish spacing between the two shaft ends as required by the coupling If a motor is being used that has end play in the shaft be sure its rotor is located on magnetic center before setting this spacing It also needs a limited end fl oat kit When the blower is driven through V belts the driver mu...

Страница 9: ...bs and maximum deviation from parallel of the inside coupling faces not greater than 001 inches 03 mm when checked at six points When the driver is a steam turbine the final alignment should be made with the turbine at operating temperature in order to allow for shaft movement resulting from expansion Piping Before connecting the piping thoroughly clean it The piping should be sized so that air ve...

Страница 10: ... unloading valve permits starting under no load conditions The optional back pressure regulator shown in Figure 5 is required if volume demands vary while the blower operates at a constant speed It may be vented if only air is being handled Depending on permissible sound levels in the general surroundings a vent silencer may be required In some installations particularly when two or more blowers d...

Страница 11: ...in the gearbox itself through a metering orifice in the secondary wall The lower gear teeth pick up oil and carry it to the meshing point with the upper gear where it is splashed onto oil control shields with leaders that direct the oil to the two bearings A dam at each bearing maintains the desired oil level there with excess overflowing into the gearbox primary sump Inboard sealing of the shafts...

Страница 12: ...he sight glass a satisfactory amount of oil is present During the fi rst week of blower operation check the oil level daily and watch for leaks Replenish oil as necessary Thereafter an occasional check should be sufficient Drain plugs 67 and 88 are provided at the bottom of the gearbox and bearing sumps Common Opposite Gear End Reservoirs Some blowers are equipped with a common reservoir on the op...

Страница 13: ...blower is ready for trial operation under no load conditions The following procedure is suggested for this initial operation test period 9 Start the blower let it accelerate to full speed and then shut it off Listen for any knocking sounds both with the power on and also as it slows down 10 If no problems have been noted after the blower comes to a complete stop restart the unit and let it operate...

Страница 14: ...strict the vents Do not use air blowers on explosive or hazardous gases Other potential hazards to safety may be associated with operating this equipment All personnel working in or passing through the area should be warned by signs and trained to exercise adequate general safety precautions Preventive Maintenance Daily Record the following Lube oil pressure if applicable Lube oil temperature if a...

Страница 15: ...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 ...

Страница 16: ...ILRB 3000 GEA20261 RAS and RAS J WHISPAIR Blowers Page 16 of 33 ...

Страница 17: ...epends on the number of impeller tips contacting the cylinder and can range from one to four times the RPM Impeller to head plate contact The vibration frequency is erratic and unsteady Damaged gears generate vibrations at mesh frequency number of teeth times RPM Damaged bearings generate vibrations at ball pass frequency fundamental train frequency and ball spin frequency Rotor unbalance and a be...

Страница 18: ...rings Experience indicates that a high percentage of bearing failure is caused by dirt contamination before or during assembly Therefore clean the work area before starting disassembly and protect new or reusable parts as work progresses The following detailed work procedures describe repairs and adjustments that can typically be handled successfully at the installation site While reading the inst...

Страница 19: ...f a turn at a time Check that the screws cannot be turned any more by applying the specified torque Removing 10 Taper Bore Gears 1 Remove the gear nut 2 Install Gear Remover within 1 8 inch of the gear face Note This gap is necessary to unseat the gear from the shaft taper 3 Apply Neverseez on 3 4 10X3 long grade 8 cap screw threads and under the hex heads 4 Install cap screws through the gear rem...

Страница 20: ...e installation cap screws Finger tighten the cap screws 6 Install the indicator on the gear outside face for measuring the gear axial movement 7 Tighten each screw a quarter turn at a time in either a clockwise or counter clockwise sequence not a diametrically opposite sequence until the outer ring is solid against the inside ring Note The gear should move 065 to 075 inches 8 Loosen up the install...

Страница 21: ...king sure that any gear tooth clearance is always taken up in the same direction Note There are two front and two back clearance positions in one complete revolution Use the minimum clearance value found along the length of impeller for fronts and backs throughout a 90 degree rotation 4 Loosen the screws on one gear make sure the collars are loose to permit slight adjustments of position relative ...

Страница 22: ...oard seal replacement Reversible CW CCW green coated seal for drive shaft seal replacement Protective sleeve tool inboard seals Protective sleeve tool drive shaft seal Warning For seals to perform properly Use careful handling procedures to avoid damaging the seals during installation Use the installation sleeves provided in the kit as described in Operation F below Seal lips are not very flexible...

Страница 23: ...ILRB 3000 GEA20261 RAS and RAS J WHISPAIR Blowers Page 23 of 33 ...

Страница 24: ...earances and forces the bearing rollers and races to center as in normal running Refer to Figure 15 6 Set the impellers lengthwise in the case using long pieces of shim stock or feelers as wedges between the two ends of each impeller and the headplates Apply the total end clearance obtained in Step 8 of Operation D to the two ends of each impeller and the headplates Place wedges equal to two third...

Страница 25: ...ILRB 3000 GEA20261 RAS and RAS J WHISPAIR Blowers Page 25 of 33 ...

Страница 26: ...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 Clearances may change in service but they should never be less than the minimum values listed Only well qualified personnel should attempt to measure cl...

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Страница 33: ...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 We have innovation in our hearts and every day we focus on providing you with the best solutions for your vital operations ...

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