Download - 528_702_manual Ventiladores en Ingles (Original)

INDUSTRIAS MECANICAS DE TUDELA, S. A.

ASSEMBLY . OPERATING AND MAINTENANCE INSTRUCTIONS

PFT, LPFT, VPFT, ENF, ELF, ELFA, SX.

24-07.002, N/L/V/-PFT, ENF, ELF, ELFA and SX-type

Installation, operation and maintenance manual

J. Bos 1 of 21 24-07.002R15E - 16/4/2002

Index 1. Objective .............................................................................................................................................................2 2. Scope .............................................................................................................................................................2 3. Introduction.........................................................................................................................................................2 4. General .............................................................................................................................................................3 4.1. Safety .............................................................................................................................................................3 5. Receipt and Product identification..............................................................................................................4 5.1 Receipt instruction...........................................................................................................................................4 5.2 Product identification.......................................................................................................................................4 6. Storage Instructions ........................................................................................................................................5 6.1. Short-term storage (max. 1 month)............................................................................................................5 6.2. Long-term storage (exceeding 1 month) ..................................................................................................5 7. Mounting Instructions......................................................................................................................................5 7.1. Mounting instructions, impeller, general...................................................................................................5 7.2. Mounting instructions, coupling (Howden supply option) ...................................................................7 7.3 Taperbush...........................................................................................................................................................8 7.4. Mounting instructions, locking plate (Howden supply option) ...........................................................9 7.5. Mounting instructions, hub plate .................................................................................................................9 7.6. Mounting instructions, blade adjustment............................................................................................... 10 7.6.1 Adjustment of T- en E-type blade angle ................................................................................................12 7.6.2 Adjustment of SX-type blade angle .........................................................................................................13 7.7. Balancing.........................................................................................................................................................15 7.8. Mounting instr., adjusting the impeller with regard to the impeller casing .................................16 8. Inspections before commissioning.......................................................................................................... 16 8.1. Inspections before initial commissioning with stationary impeller ................................................16 9. Fan Commissioning......................................................................................................................................17 9.1 First inspection............................................................................................................................................... 17 10. Maintenance Instructions ............................................................................................................................17 10.1. Blade maintenance .......................................................................................................................................17 10.2. Impeller maintenance..................................................................................................................................17 11. Trouble Shooting...........................................................................................................................................18 11.1. Motor power .................................................................................................................................................... 18 11.2. Vibrations .........................................................................................................................................................18 12. Spare parts ......................................................................................................................................................20 12.1. Spare parts list ............................................................................................................................................... 20 13. Reference to Standards/Procedures/Literature ..................................................................................21 14. Modifications regarding to previous edition.......................................................................................... 21 Appendix Declaration by the manufacturer 99-70.043 rev.01



J. Bos 2 of 21 24-07.002R15E - 16/4/2002

1. Objective This document sets out the requirements with regard to the security, receiving, storage and installation of the impellers supplied by Howden of the following types: T-type: PFT, LPFT en VPFT; E-type: ENF, ELF en ELFA; SX-type. 2. Scope These instructions apply to all non-adjustable impellers (while in operation) of the Cooling Fan department of Howden. 3. Introduction All technical and technological information contained in these instructions as well as any drawings and technical descriptions made available remain the property of Howden.They shall not be used for any other purpose but this installation without prior written consent. Nor shall they be copied, multiplied, relayed or communicated to third parties. The data published in these instructions incorporate the latest views. They are handed out subject to later alterations. We reserve the right to change the construction and/or design of our products at any given time without having to modify accordingly earlier deliveries. These instructions contain useful and important information for the correct functioning and maintenance of your impeller. They also contain important recommendations to prevent possible accidents and serious damage during commissioning and impeller operation, thus trying to guarantee a safe and flawless operation of your impeller.Read the instructions carefully before putting the installation into operation; become familiar with the operation and control and strictly follow the recommendations given. As with all machinery, the impeller will require periodic maintenance. Chapters 10 through 12 will provide the required information on mainte nance, malfunctions and spare-part identification and are meant for technical and maintenance staff and for those responsible for the ordering of spare parts. Should you have any questions or require further explanation concerning specific subjects regarding your impeller, please do not hesitate to contact us. Howden Cooling Fans Lansinkesweg 4, 7553 AE P.O. Box 975, 7550 AZ Hengelo The Netherlands e-mail: [email protected] Website: www.howdenpower.com Tlf.: +31 74 2556000 Fax: +31 74 2556060

Finally, we point out to you that any warranty regarding your installation will become void if - servicing/maintenance of the machine has not been executed in strict accordance

with the instructions; - necessary repairs have not been executed b y employees of Howden, or have been executed

without our prior written consent; - the installation has been modified without our prior written consent; - no original Howden parts are used; - the installation is used in an improper or negligent way, or if it is not used according to its

nature and/or purpose.



J. Bos 3 of 21 24-07.002R15E - 16/4/2002

4. General The impellers of the fans are designed for: Howden Cooling Fans FRP impellers are designed for application in cooling towers, air-cooled condensers and air-cooled heat exchangers. The continues operating temperature range of the E-series and SX-series impellers is from -20 °C (-4 °F) to +65 °C (+149 °F). Occasionally, for period of up to 12 hours, the impeller may be exposed to a maximum temperature of +80 °C (+ 176 °F), for example during start-up or during stand still. In case the temperature in your application exceeds the maximum limits mentioned before, then please contact Howden for review of the full operating conditions. In a humid arrangement the fan blades must be provided with an erosion-resistant layer on the inlet side. The design conditions for your application, e.g. pressure, air flow, speed and blade pitch angle are stated in the Howden order confirmation. As such the Howden order confirmation is an integral part of these instructions. Raising the speed of this impeller is not allowed without prior written consent by Howden. The impeller consists of a hub plate with blades adjustable at stands till. The blades are of glass-fibre reinforced polyester (GRP). The impeller is fastened with a coupling flange and locking plate (which may or may not be supplied by Howden). The impellers are balanced according to ISO 1940, balancing quality grade G = 6,3. The fan shall be arranged in such a way that there is no obstruction to the air flow through the impeller casing. The fan support and drive shall be constructed such that the running characteristics are not unfavourably influenced. For the type designation, see 5.2. 4.1. Safety General The fan shall be used for the purpose it was designed for. Safety requirements and instructions shall be followed carefully. Personal protection equipment shall be used whenever required. See also Appendix 99-70.043 of this standard. Do not walk on the blades. Make certain that the security requirements mentioned above have been met in order to ensure safe working conditions. Commissioning Re-place any protection removed for maintenance purposes before starting up the fan. Necessary precautions shall be taken to prevent objects, e.g. assembly aids such as beams, supports and ladders, that might get into the fan, from hurting people or damaging the product. Maintenance Do not start any maintenance activities until the fan has been shut down and it is dead. This shall be done such that the power cannot be switched on unintentionally or inexpertly during maintenance. Protections which are mounted shall not be removed or put out of service, but shall be applied properly. When starting up the fan again, all legal requirements regarding safety distances from both live and rotating parts, shall be complied with..



J. Bos 4 of 21 24-07.002R15E - 16/4/2002

5. Receipt and Product identification 5.1 Receipt instruction All consignments are accompanied by a packing list with the following data: a. order number of Howden and customer; b. impeller type c. parts supplied by Howden. The delivered goods shall be immediately checked upon arrival for: - full compliance with the order and/or - the description stated on the packing list. The parts are mentioned in chapter 12 Fig. 12, item Nos. 01 through 16. Any deviations, damage and/or omissions established upon receipt shall be reported forthwith to the forwarding agent or, if necessary, by telephone to Howden. In case of negligence from the costumer, claims for damages shall not be accepted at a later stage, unless clear evidence which shall also be acceptable to our forwarding insurance company, can be handed over proving Howden, or the respective forwarding agent, to be liable for the omission and/or damage. When unpacking an impeller from a closed crate: - all supporting blocks and fastenings shall be removed; - vulnerable parts packed in woodwool or otherwise shall be immediately removed from the

crate and stored in a dry room. The protection of machined surfaces shall never be removed before required for assembly purposes. 5.2 Product identification The impellers supplied by Howden are provided with a product identification plate. See the example in figure 1. The plate is attached to the clamping piece side of the hub plate. The plate states per order: - the Howden order number ("Order") - the Howden impeller type ("Type") From the impeller type one can deduce the following information: - impeller diameter (>100 [mm], < 100 [ft]) - blade type - number of blades From the blade type and the impeller diameter, using table 4 in section 7.5 one can deduce the accessory Howden coupling flange and the accessory fixing bolt. The type of coupling flange corresponds with the connecting dimension of the coupling flange, in mm.

Fig. 1



J. Bos 5 of 21 24-07.002R15E - 16/4/2002

Example : type 9900 ELF 8 Order number : 100500 Impeller diameter : 9900 mm *) Blade type : ELF Number of blades : 8 Hub plate number : 3 *) When the figure representing the impeller diameter is smaller than 100, this diameter will

be stated in (ft). 6. Storage Instructions A prerequisite in the event of impeller storage is that all necessary precautions must be taken to prevent penetration of water, dirt, dust and other irregularities into or on the impeller. 6.1. Short-term storage (max. 1 month) Indoor storage Non-preserved machined parts shall be preserved with an anticorrosion protection, e.g. ESSO Rustban 397 or equivalent. Outdoor storage The impeller shall be covered against moisture and dust. Non-preserved machined parts shall be preserved with an anticorrosion protection, e.g. ESSO Rustban 397 or equivalent. 6.2. Long-term storage (exceeding 1 month) The impeller shall be stored in a dry, ventilated and dustfree room. Non-preserved machined parts shall be preserved with an anticorrosion protection, e.g. ESSO Rustban 397 or equivalent. 7. Mounting Instructions 7.1. Mounting instructions, impeller, general Assembly drawing.

Fig. 2



J. Bos 6 of 21 24-07.002R15E - 16/4/2002

Check that the vent hole at the blade tip is open. (See fig.11) Tectyl-treated surfaces of parts to be assembled shall be cleaned before assembly and following the assembly be provided with an anti corrosion protection, e.g. ESSO Rustban 397 or equivalent. The blade stems and clamping pieces shall be clean and free from damage. Blades and bottom clamps are numbered. Bolts and nuts shall be tightened with a calibrated torque wrench. The impeller shall not be hoisted using the U-bolts, figure 3.

Fig. 3

Check the concentricity of the shaft end before mounting the impeller on the driver shaft end.The impeller shall not be mounted if the concentricity error exceeds 0.02 mm, seen figure 4.

Fig. 4



J. Bos 7 of 21 24-07.002R15E - 16/4/2002

7.2. Mounting instructions, coupling (Howden supply option) The following activities shall be carried out: - remove the preservation from shaft end, keyway and bore using paraffin; - heat the coupling uniformly to 120 °C in an oil bath or electrical oven; - slip the coupling onto the shaft end up to the shaft shoulder and leave it to cool down in calm air. - Check by means of a dial gouge whether the adjusting rim and the supporting face of the

coupling flange are positioned sufficiently accurately in relation to the axis of rotation. The deviations permissible as a maximum are shown in figure 5 and table 1.

Fig. 5

Tabel 1 Coupling

Type/measure a X (mm) Y (mm)

80 0.08 0.10 115 0.10 0.14 190 0.15 0.22 250 0.20 0.28 335 0.25 0.36 500 0.30 0.52



J. Bos 8 of 21 24-07.002R15E - 16/4/2002

7.3 Taperbush If a Browning split taper bushing is fitted, observe manufacturer’s instructions. - Slide splitbushing entirely on the fan shaft on the right height, regard that the screws still can

be fitted. - Lock splitbushing on shaft by tightening set screw in flange, a sleeve should be provided to

prevent hub from sliding downward on the shaft at assembly. - Set coupling flange (eventual with hub) on splitbushing and engage cap screws into bottom

of hub. - Tighten in steps in an even sequential manner, using tightening torques according to the

instructions of the manufacturer (see table 2). - After installation, exposed splitbushing and threads may be coated with a rust preventative or

'Never-Seez'. - That measure X at least 2 times the measure S has to be (see Fig. 6).

Table 2 Tightening torques X = (at least 2xS) Type Nm in Lbs mm Inch

P2 22 192 13 ½ Q2 39 348 15 16

9

R2 39 348 15 16

9

S1 95 840 20 ¾ U1 190 1680 24 16

15 W1 340 3000 29 1 8

1

Fig. 6



J. Bos 9 of 21 24-07.002R15E - 16/4/2002

7.4. Mounting instructions, locking plate (Howden supply option) Hanging fans must be vertical locked, the clamping of the coupling flange and the taperbushing is not enough. Before assembling the locking plate with packing, treat shaft end and coupling flange with an anticorrosion protection, e.g. ESSO Rustban 397 or equivalent. For the correct tightening torque, see table 3.

Table 3

Coupling type Locking plate Diameter [mm]

Thread Size

Tightening torque [nm]

80-115 79 M10 48 M12 85 M16 150 M20 195

190-250 189 M16 200 M20 245 M24 300

335 240 M24 540 M30 700

500 360 M30 850 Bolt size depends on the diameter of the output shaft. Torques apply to bolts supplied by Howden. 7.5. Mounting instructions, hub plate Mount the hub plate on the coupling flange. If the impeller is assembled before it is mounted on the coupling flange, support the hub plate sufficiently. For the correct tightening torque, see table 4.

Table 4

Diameter T-type

Diameter E-type

Diameter SX-type

CouplingType

Thread size

Tightening torque

[mm] [ft] [mm] [ft] [mm] [ft] [nm] 710-800 --- --- --- 1240-1585 4-5 1240-1585 4-5 900-1585 3-5 80 M12 75 1780-2475 6-8 1780-2475 6-8 1780-2775 6-9 115 M16 185 2775-4455 9-14 2775-4455 9-14 3120-4455 10-14 190 M20 360 4950-7030 16-24 4950-7030 16-24 4950-7030 16-24 250 M24 625 7920-9900 26-32 7920-10400 26-34 7920-10400 26-34 335 M30 1260 10400-12400 36-40 11100-12400 36-40 11100-12400 36-40 500 M42*3 2600 13850-15850 44-48 710 M48*3 5500



J. Bos 10 of 21 24-07.002R15E - 16/4/2002

7.6. Mounting instructions, blade adjustment Mounting of fan blades having a diameter of up to 14 feet inclusive or 4455 mm - Examine whether all fan blades are having the same project number. - Put every fan blade in a clamping block, ensuring that the blade number corresponds with the

number in the clamping lock.(for position order number and blade number see Fig. 7) Mounting of fans having a diameter of over 14 feet or 4455 mm - Examine whether all fan blades are having the same project number. - Fan blades may be mounted on any accompanying web plate. - In case of an odd set of fan blades in numerical sequence, for example for a 5-blade fan in

the sequence 11A, 11B, 11C, 11D and 11E. - In case of an even set of fan blades you should always mount blade A precisely facing blade B,

for example for a 6-blade fan 31A facing 31B, 32A facing 32B and 33A facing 33B.

Fig.7 Place each blade in the bottom clamp such that the numbers of the blade and of the bottom clamp correspond. Mount the top clamp(s) and U-bolt(s). The nuts of the U-bolts have been provided with a special "low friction" coating. ONLY these nuts, to be supplied by Howden, must be used. Fix the U-bolts such that the blade can still be somewhat turned in the clamp, necessary for the pitch adjustment. The blade stem collar shall abut against the bottom clamp, which can be achieved by pulling the blade outwards. After adjustment of the blade angle (E, T-type, point 7.6.1; SX-type, point 7.6.2), the nuts of the U-bolts have to be torqued, using the value stated in table 6. See table 5 for the correct size of the screw thread. Tighten firstly the U-bolt at the collar side.



J. Bos 11 of 21 24-07.002R15E - 16/4/2002

Table 5

Diameter T-type

U-bolt Type

Diameter E-type

U-bolt type

Diameter SX-type

U-bolt type

[mm] [ft] [mm] [ft] [mm] [ft] 1219-2475 4-8 M12 1240-3120 4-10 M12 710-1240 3-4 M12 2775-3658 9-12 M16 ENF 3515 11 M12 1385-1780 5-6 M16 3960-4455 13-14 M20 ELF/A 3515 11 M16 1980-2475 7-8 M20 4950-5545 16-18 M24 3960-4455 12-14 M16 2775-3120 9-10 M24 6240-7030 20-24 M30 4950-5545 16-18 M20 3515-3960 11-14 M30 7920-8910 26-30 M36 6240-7030 20-24 M24 4455-10400 16-34 M36 9900-11100 32-36 M42 7920-10400 26-34 M30 11100-12400 36-40 M36 12400 40 M36 ENF/ELF

11100-12400 36-40 M36

ELFA 11100-12400

36-40 M42

ENF-ELF 13850-15850

44-48 M36

Material U-bolts according to EN 10088

Table 6

U-bolts Type

Tightening torque [nm]

A2 A4 M12 60 M16 140 M20 250 M24 425 380 M30 650 500 M36 1100 970 M42 1300 -

The material code A2/A4 is stated on the nut for the U-bolt.

WARNING !! Tighten the nuts of the U-bolts evenly. See 7.6 table 5 and 6 for the correct tightening torque. During tightening of the U-bolts, keep checking that the blade pitch does not change and that the blade spindle collars do not move. Readjust, where appropriate. After initial installation you are required to re-tighten the U-bolts as they may have loosened due to creep of the FRP material of the blade shaft. Re-tightening of the U-bolts shall either be done 120-150 hours after original installation in case the fan has not been operated, or 50-75 hours after start-up of the fan in case the fan has been put in operation immediately after installation. Note: For some special applications the lower clamping pieces have location bolts instead of location pins. These bolts shall not be tightened again, as they have been locked in the factory using “Locktite”.



J. Bos 12 of 21 24-07.002R15E - 16/4/2002

7.6.1 Adjustment of T- en E-type blade angle Lift the blade at the tip and position it at the correct pitch, as indicated in, figure 8. Check the blade pitch using a blade pitch gauge. Take a plane parallel to the impeller as a reference for adjusting the blade pitch gauge. Tolerance on the blade angle is ± 0,5° The pitch shall always be measured at 50-150 mm from the blade tip.

LETTER DESCRIPTION

α Blade Angle

B Blade Tip

C Blade leasing edge

D Blade trailing edge

E Direction of flow

F Direction of rotation

Fig. 8



J. Bos 13 of 21 24-07.002R15E - 16/4/2002

7.6.2 Adjustment of SX-type blade angle For SX fans the blade adjustment can be done in two ways: See table 7 for the dimens ions. 1. By marking the blade tip height in the fan casing. The height can be found by adding the values R and T. For the intermediate values

R and T can be found by interpolating. This applies to both the situation according to figure 9a and 9b.

2. By adjusting the angle between blade and spindle collar. The angle to be adjusted is determined by adding the correction angle ß and the selected blade angle. This applies only to the situation according to figure 9a.

Fig. 9a

Fig. 9b

Letter Description Letter Description α Blade angle D Blade trailing edge B Blade tip E Direction of flow C Blade leasing edge F Direction of rotation



J. Bos 14 of 21 24-07.002R15E - 16/4/2002

Table 7

Blade angle SX-type αα = 5° 10° 15° 20° 25° 30° A A L M N W S ß R T R T R T R T R T R T Ft Mm ° Mm

710 65 20 18 800 65 20 18 160 35 16 25 10 50 20 75 25 100 35 125 40 155 50 900 65 20 18 205 35 15 -40 85 -5 105 25 125 50 140 80 155 105 175 3 914 65 20 18 205 35 15 -40 85 -5 105 25 125 50 140 80 155 105 175 1000 65 20 18 205 35 15 -10 55 25 75 55 95 80 110 110 125 135 145 1200 75 20 18 205 40 18 8 40 50 55 85 65 120 75 160 85 195 95 4 1219 75 20 18 205 40 18 8 40 50 55 85 65 120 75 160 85 195 95 1240 75 20 18 205 40 18 8 40 50 55 85 65 120 75 160 85 195 95 1385 95 25 18 320 57 12 -25 105 15 140 55 165 95 195 135 225 170 245 5 1524 95 25 18 320 57 15 -15 90 35 125 85 145 135 175 175 195 215 215 1585 95 25 18 320 57 15 -15 90 35 125 85 145 135 175 175 195 215 215 1780 95 25 18 320 57 18 10 75 65 95 125 115 185 135 235 145 285 165 6 1829 95 25 18 320 57 18 10 75 65 95 125 115 185 135 235 145 285 165 1980 135 30 18 450 75 18 -35 125 25 150 75 215 130 255 180 300 235 340 7 2134 135 30 18 450 75 20 -15 110 55 150 115 180 180 210 240 245 300 275 2220 135 30 18 450 75 20 -15 110 55 150 115 180 180 210 240 245 300 275 8 2438 135 30 18 450 75 22 5 95 85 120 155 145 230 165 300 190 365 110 2475 135 30 18 450 75 22 5 95 85 120 155 145 230 165 300 190 365 110 9 2743 160 40 18 560 90 21 -40 180 40 220 125 270 210 310 295 350 375 390 2775 160 40 18 560 90 21 -40 180 40 220 125 270 210 310 295 350 375 390 10 3048 160 40 18 560 90 22 -35 170 60 210 145 245 240 280 335 325 420 355 3120 160 40 18 560 90 22 -35 170 60 210 145 245 240 180 335 325 420 355 11 3353 190 50 18 740 110 14 -25 215 75 290 165 360 275 425 370 495 480 565 3515 190 50 18 740 110 15 -20 205 85 275 190 340 300 405 405 470 515 535 12 3658 190 50 18 740 110 16 -15 190 100 255 215 320 330 390 445 445 550 500 3960 190 50 18 740 110 18 35 150 170 195 310 240 435 285 560 330 670 360 13 3962 190 50 18 740 110 18 35 150 170 195 310 240 435 285 560 330 670 360 14 4267 190 50 18 740 110 18 35 150 170 195 310 240 435 285 560 330 670 360 4455 270 70 18 740 150 16 35 150 170 195 310 240 435 285 560 330 510 360 16 4877 270 70 18 920 150 22 -85 385 35 505 170 620 290 730 410 840 510 850 4950 270 70 18 920 150 22 -85 385 35 505 170 620 290 730 410 840 510 850 18 5486 270 70 18 920 150 24 -40 325 95 420 225 500 370 595 510 685 630 770 5545 270 70 18 920 150 24 -40 325 95 420 225 500 370 595 510 685 630 770 20 6096 270 70 18 1020 150 23 15 220 155 345 285 455 425 575 545 665 685 775 6240 270 70 18 1020 150 23 15 220 155 345 285 455 425 575 545 665 685 775 22 6706 270 70 18 1020 150 26 115 135 295 235 445 315 605 395 745 475 895 555 7030 270 70 18 1020 150 26 115 135 295 235 445 315 605 395 745 475 895 555 24 7315 270 70 18 1170 150 23 15 225 155 340 285 450 415 565 540 665 670 775 7920 270 70 18 1170 150 24 35 195 190 310 350 430 495 525 635 620 785 730 26 7925 270 70 18 1170 150 24 35 195 190 310 350 430 495 525 635 620 785 730 28 8535 270 70 18 1170 150 25 105 125 270 215 440 305 595 385 735 460 905 545 8910 270 70 18 1290 150 22 70 310 120 420 270 530 420 630 560 720 690 820 30 9145 270 70 18 1290 150 22 -30 310 120 420 270 530 420 630 560 720 690 820 32 9754 270 70 18 1290 150 22 10 190 160 340 320 430 470 520 610 600 740 680 9900 270 70 18 1290 150 22 10 190 160 340 320 430 470 520 610 600 740 680 34 10363 270 70 18 1290 150 22 10 190 160 340 320 430 470 520 610 600 740 680 10400 270 70 18 1290 150 22 10 190 160 340 320 430 470 520 610 600 740 680 36 10973 375 100 18 11100 375 100 18 40 12192 375 100 18 12400 375 100 18

On request



J. Bos 15 of 21 24-07.002R15E - 16/4/2002

7.7. Balancing Impellers with straight blades and a diameter smaller than 4455 mm, just like SX impellers with a diameter smaller than 2743 (=9') , have been balanced in assembly. This can be done in two ways: A. clamping at the flow inlet side B. clamping at the flow outlet side How the impeller has been balanced is stated on the sticker that has been affixed to the hub. See figure 10.

Fig. 10 If not agreed otherwise, the impeller is balanced according to standard B.

WARNING!! If the impeller is installed otherwise than it has been balanced, i.e. configuration A instead of B or the other way round, the risk exists that the fan has to be balanced again.



J. Bos 16 of 21 24-07.002R15E - 16/4/2002

7.8. Mounting instr., adjusting the impeller with regard to the impeller casing The impeller is to be adjusted centrically in the impeller casing. The adjustment procedure is as follows: - Determine the longest blade by measuring on all blades the space between the blade tip and the impeller casing, from a fixed point in the impeller casing. The longest blade has the

smallest measured clearance. - Now rotate the impeller with the longest blade fitted in the impeller casing and measure the clearance between blade tip of the longest blade and impeller casing. The number of measuring points is indicated in table 8 - The design clearance between blade tip and impeller casing is 0.5% of the impellerdiameter. - The minimum allowable local clearance between blade tip and impeller casing is 0.33% of

the impeller diameter.

Table 8

Impeller diameter Number of measuring points in fan casing (evenly distributed along the inner circumference)

Mm Ft 700-2000 3-6 4 2001-4000 7-13 6 4001-6000 14-18 8 6001-12500 22 - 40 12 12501 - 16000 44 - 48 16

8. Inspections before commissioning Check if the machine into which the impeller has been incorporated complies with the provisions of Directive 98/37/EEC. If not so, then Appendix 99-70.043 of this standard is applicable. 8.1. Inspections before initial commissioning with stationary impeller Check: - the fastening of the blade and sequence; - the tightening torques of the impeller fastening bolts, see 7 table 2,3,4,5 and 6 - the clearance between blade tip and impeller casing, see 7.8. - the blade pitch, see 7.6, figure 9 for SX impellers, and 7.6, figure 8 for other impeller types; - the direction of rotation (see arrow indicating the direction of rotation on the driver); - that there is no obstruction in the air flow through the impeller casing; - that any wire mesh, scaffolding etc. has been removed; - that gauze frames are mounted.



J. Bos 17 of 21 24-07.002R15E - 16/4/2002

9. Fan Commissioning Do not start the fan without properly installed guards, whether or not part of our supply, and without all safety measures having been complied with, see chapter 4.1. Check: - the dynamic running characteristics of the fan, see Chapter 11 "TROUBLE SHOOTING"; - the main shaft bearing temperatures according to instructions of the bearing manufacturer; - the absorbed power or current intensity. If the absorbed power or current intensity are too high, proceed as follows: Check that the ambient temperature corresponds with the operating tem perature applicable. At a LOWER ambient temperature the absorbed power increases. If a possible power deviation cannot be explained from the temperature difference mentioned, the blade pitch shall be adjusted. This adjustment shall be in the 1 to 3 degree range. 9.1 First inspection

WARNING !! Since the material of the blade spindle will creep after the initial installation, Howden advices to tighten the nuts of the U-bolt before putting the fan in to operation or just before leaving the plant, however not earlier than 50-75 hours in operation or 150 hours at stilstand. If this is not done, the blades will come loose, which may result in a disaster. See 7, table 5 and 6 for the proper tightening torques.

10. Maintenance Instructions Although the impeller requires only little supervision and maintenance, it is yet necessary to inspect it at at regular intervals to prevent break-downs due to vibrations, moisture or fouling. During the performance of maintenance activities at the fan, the impeller should be fastened and the electric connection of the E-motor should be disconnected 10.1. Blade maintenance The blades shall be inspected at regular intervals depending on the operating conditions, but with a minimum of once every month, for deposits and damage. Deposits shall be removed using brushes and/or a water jet with a maximum wate r pressure of 3 bar. Check if the holes at the blade end are open. (See fig. 11) Neglected damaged areas can result in attack of the glass-fibre layers because of moisture entering through these spots. Maintenance and repair can only be carried out properly according to Howden procedures. For more information on this subject you are to contact Howden. 10.2. Impeller maintenance To ensure optimal functioning and operational safety of the impeller, it is necessary to at least once a year: a) check the tightening torque of the bolt connections, see 7 table ,2,3,4,5 and 6 b) to apply a new paint coating, if the paint coating is damaged or corroded away, to prevent

corrosion. The paint type shall be at least equal to the original paint.

c) to replace corroded bolts and nuts in time.



J. Bos 18 of 21 24-07.002R15E - 16/4/2002

11. Trouble Shooting 11.1. Motor power

Trouble Possible cause Possible solution Maximum absorbed Motor power too high

Incorrect blade pitch See paragraph 7.6

Driver bearing damage Check or replace Incorrect drive alignment Realign

11.2. Vibrations If the vibration amplitudes measured at the main shaft bearings exceed 7,1 mm/s (according ISO 10816-1, class IV, group B recommendations, proceed as fol lows; (this only regards the fan) - check the fastening bolts of the motor and/or gearbox for correct tightening torques. - check the alignment of the total drive. - check the mating faces of coupling and hub plate. - check for imbalance of motor, motor rope pulley, gearbox or cardan shaft. - check the position and fastening of the blades. - check if the holes at the blade end are open. (See fig. 11) In case of any failure, please contact Howden stating order number as present on fan name plate and packing list.

Fig. 11

WARNING !! If the vibration level of the fan is higher than 18 Vrms, the fan has to be stopt immediately and correction measures have to be made.



J. Bos 19 of 21 24-07.002R15E - 16/4/2002

Diagrams for admissible bearing vibrations.

D = Inadmissible Veff 18 Vrms C = Still admissible (should be improved) Veff 7,1 Vrms B = Usable Veff 2,8 Vrms A = Good



J. Bos 20 of 21 24-07.002R15E - 16/4/2002

12. Spare parts When ordering spare parts, please state impeller type and order number as described in Howden order confirmation. The blades shall be mounted as described in Chapter 7 and following. When supplying spare parts in pairs, the blades with similar figures are to be installed facing each other. Always check the vibrational behaviour of the blades, see paragraph 11.2. 12.1. Spare parts list

Fig. 12 POS.No. NAME POS.No. NAME 01 Hub plate 10 Nut 02 Clamp (bottom half) 11 Washer 03 Location pins 12 Locking plate (option) 04 Clamp (top half) 13 Packing 05 U-bolt 14 Bolt 06 Washer 15 Washer 07 Nut 16 Blade 08 Coupling flange (option) 09 Bolt



J. Bos 21 of 21 24-07.002R15E - 16/4/2002

13. Reference to Standards/Procedures/Literature EN 10088 Heat-treatable steel, alloy steels and free cutting steels. Part 13: Wrought stainless steels ISO 1940 Mechanical vibration. Balance quality requirements of rigid rotors ISO 10816-1 Mechanical vibration of machines with operating speeds from 10 to 200 rev/s. Basis for specifying evaluation standards. Machinery directive 98/37/EEC Directive by the Council of the European Communities of 22 June 1998. 14. Modifications regarding to previous edition Changed General operating temperature. Added Hub plate number on product identification plate. Updated Fig. 2. Updated Fig. 5. Added Taperbush instructions Updated Table 3. Completed 7.6. Completed Warning on page 11. Modified Fig. 8. Modified Warning on page 15. Modified Warning on page 18. Added option in Fig. 12.