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528_702_manual Ventiladores en Ingles (Original)

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INDUSTRIAS MECANICAS DE TUDELA, S. A. ASSEMBLY . OPERATING AND MAINTENANCE INSTRUCTIONS PFT, LPFT, VPFT, ENF, ELF, ELFA, SX.
Transcript

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-typeInstallation, operation and maintenance manual

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

Appendix Declaration by the manufacturer 99-70.043 rev.01

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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: Website: Tlf.: Fax:[email protected]

www.howdenpower.com +31 74 2556000 +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.

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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 glassfibre 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..

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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 state s 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

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Example Order number Impeller diameter Blade type Number of blades Hub plate number *)

: type 9900 ELF 8 : 100500 : 9900 mm *) : ELF :8 :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.

7.7.1.

Mounting InstructionsMounting instructions, impeller, general

Assembly drawing.

Fig. 2

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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

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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 X (mm) 0.08 0.10 0.15 0.20 0.25 0.30

Coupling Type/measure a 80 115 190 250 335 500

Y (mm) 0.10 0.14 0.22 0.28 0.36 0.52

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7.3

Taperbush

If a Browning split taper bushing is fitted, observe manufacturers 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).

Type P2 Q2 R2 S1 U1 W1

Table 2 Tightening torques Nm in Lbs 22 192 39 348 39 95 190 340 348 840 1680 3000

X = (at least 2xS) mm Inch 13 9 15 16 15 20 24 299 16

15 16

1 18

Fig. 6

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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 80-115 Locking plate Diameter [mm] 79 Thread Size M10 M12 M16 M20 M16 M20 M24 M24 M30 M30 Tightening torque [nm] 48 85 150 195 200 245 300 540 700 850

190-250

189

335 500

240 360

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 [mm] 1240-1585 1780-2475 2775-4455 4950-7030 7920-9900 10400-12400 Diameter E-type [mm] 1240-1585 1780-2475 2775-4455 4950-7030 7920-10400 11100-12400 13850-15850 Diameter SX-type [mm] 710-800 900-1585 1780-2775 3120-4455 4950-7030 7920-10400 11100-12400 Coupling Type [ft] 3-5 6-9 10-14 16-24 26-34 36-40 --80 115 190 250 335 500 710 --M12 M16 M20 M24 M30 M42*3 M48*3 Thread size Tighte ning torque [nm] --75 185 360 625 1260 2600 5500

[ft] 4-5 6-8 9-14 16-24 26-32 36-40

[ft] 4-5 6-8 9-14 16-24 26-34 36-40 44-48

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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.

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Table 5 Diameter T-type [mm] 1219-2475 2775-3658 3960-4455 4950-5545 6240-7030 7920-8910 9900-11100 12400 U-bolt Diameter Type E-type [mm] M12 1240-3120 M16 ENF 3515 M20 ELF/A 3515 M24 3960-4455 M30 4950-5545 M36 6240-7030 M42 7920-10400 M36 ENF/ELF 11100-12400 ELFA 11100-12400 ENF-ELF 13850-15850 U-bolt type [ft] 4-10 11 11 12-14 16-18 20-24 26-34 36-40 36-40 44-48 M12 M12 M16 M16 M20 M24 M30 M36 M42 M36 Diameter SX-type [mm] 710-1240 1385-1780 1980-2475 2775-3120 3515-3960 4455-10400 11100-12400 U-bolt type [ft] 3-4 5-6 7-8 9-10 11-14 16-34 36-40 M12 M16 M20 M24 M30 M36 M36

[ft] 4-8 9-12 13-14 16-18 20-24 26-30 32-36 40

Material U-bolts according to EN 10088 Table 6 U-bolts Type M12 M16 M20 M24 M30 M36 M42 Tightening torque [nm] A2 60 140 250 380 500 970 A4

425 650 1100 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.

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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 B C D E F Fig. 8 DESCRIPTION Blade Angle Blade Tip Blade leasing edge Blade trailing edge Direction of flow Direction of rotation

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

2.

Fig. 9a

Fig. 9b Letter B C Description Blade angle Blade tip Blade leasing edge Letter D E F Description Blade trailing edge Direction of flow Direction of rotation

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Table 7Blade angle SX-type = 5 10 R T R T Mm 25 -40 -40 -10 8 8 8 -25 -15 -15 10 10 -35 -15 -15 5 5 -40 -40 -35 -35 -25 -20 -15 35 35 35 35 -85 -85 -40 -40 15 15 115 115 15 35 35 105 70 -30 10 10 10 10 10 85 85 55 40 40 40 105 90 90 75 75 125 110 110 95 95 180 180 170 170 215 205 190 150 150 150 150 385 385 325 325 220 220 135 135 225 195 195 125 310 310 190 190 190 190 50 -5 -5 25 50 50 50 15 35 35 65 65 25 55 55 85 85 40 40 60 60 75 85 100 170 170 170 170 35 35 95 95 155 155 295 295 155 190 190 270 120 120 160 160 160 160 20 105 105 75 55 55 55 140 125 125 95 95 150 150 150 120 120 220 220 210 210 290 275 255 195 195 195 195 505 505 420 420 345 345 235 235 340 310 310 215 420 420 340 340 340 340

A Ft

A Mm 710 800 900 914 1000 1200 1219 1240 1385 1524 1585 1780 1829 1980 2134 2220 2438 2475 2743 2775 3048 3120 3353 3515 3658 3960 3962 4267 4455 4877 4950 5486 5545 6096 6240 6706 7030 7315 7920 7925 8535 8910 9145 9754 9900 10363 10400 10973 11100 12192 12400

L 65 65 65 65 65 75 75 75 95 95 95 95 95 135 135 135 135 135 160 160 160 160 190 190 190 190 190 190 270 270 270 270 270 270 270 270 270 270 270 270 270 270 270 270 270 270 270 375 375 375 375

M 20 20 20 20 20 20 20 20 25 25 25 25 25 30 30 30 30 30 40 40 40 40 50 50 50 50 50 50 70 70 70 70 70 70 70 70 70 70 70 70 70 70 70 70 70 70 70 100 100 100 100

N 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18 18

W

S

15 R

T

20 R

T

25 R

30 T R T

3

4

5

6 7 8 9 10 11 12 13 14 16 18 20 22 24 26 28 30 32 34 36 40

160 205 205 205 205 205 205 320 320 320 320 320 450 450 450 450 450 560 560 560 560 740 740 740 740 740 740 740 920 920 920 920 1020 1020 1020 1020 1170 1170 1170 1170 1290 1290 1290 1290 1290 1290

35 35 35 35 40 40 40 57 57 57 57 57 75 75 75 75 75 90 90 90 90 110 110 110 110 110 110 150 150 150 150 150 150 150 150 150 150 150 150 150 150 150 150 150 150 150

16 15 15 15 18 18 18 12 15 15 18 18 18 20 20 22 22 21 21 22 22 14 15 16 18 18 18 16 22 22 24 24 23 23 26 26 23 24 24 25 22 22 22 22 22 22

75 25 25 55 85 85 85 55 85 85 125 125 75 115 115 155 155 125 125 145 145 165 190 215 310 310 310 310 170 170 225 225 285 285 445 445 285 350 350 440 270 270 320 320 320 320

25 125 125 95 65 65 65 165 145 145 115 115 215 180 180 145 145 270 270 245 245 360 340 320 240 240 240 240 620 620 500 500 455 455 315 315 450 430 430 305 530 530 430 430 430 430

100 50 50 80 120 120 120 95 135 135 185 185 130 180 180 230 230 210 210 240 240 275 300 330 435 435 435 435 290 290 370 370 425 425 605 605 415 495 495 595 420 420 470 470 470 470

35 140 140 110 75 75 75 195 175 175 135 135 255 210 210 165 165 310 310 280 180 425 405 390 285 285 285 285 730 730 595 595 575 575 395 395 565 525 525 385 630 630 520 520 520 520

125 80 80 110 160 160 160 135 175 175 235 235 180 240 240 300 300 295 295 335 335 370 405 445 560 560 560 560 410 410 510 510 545 545 745 745 540 635 635 735 560 560 610 610 610 610

40 155 155 125 85 85 85 225 195 195 145 145 300 245 245 190 190 350 350 325 325 495 470 445 330 330 330 330 840 840 685 685 665 665 475 475 665 620 620 460 720 720 600 600 600 600

155 105 105 135 195 195 195 170 215 215 285 285 235 300 300 365 365 375 375 420 420 480 515 550 670 670 670 510 510 510 630 630 685 685 895 895 670 785 785 905 690 690 740 740 740 740

50 175 175 145 95 95 95 245 215 215 165 165 340 275 275 110 110 390 390 355 355 565 535 500 360 360 360 360 850 850 770 770 775 775 555 555 775 730 730 545 820 820 680 680 680 680

On request

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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.

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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) 4 6 8 12 16

Mm 700-2000 2001-4000 4001-6000 6001-12500 12501 - 16000

Ft 3-6 7-13 14-18 22 - 40 44 - 48

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.

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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.

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11.11.1.

Trouble ShootingMotor power Possible cause Incorrect blade pitch Driver bearing damage Incorrect drive alignment Possible solution See paragraph 7.6 Check or replace Realign

Trouble Maximum absorbed Motor power too high

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.

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Diagrams for admissible bearing vibrations.

D= Veff 18 Vrms C= Veff 7,1 Vrms B= Veff 2,8 Vrms A= Good Usable

Inadmissible

Still admissible (should be improved)

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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

POS.No. 01 02 03 04 05 06 07 08 09

Fig. 12 NAME Hub plate Clamp (bottom half) Location pins Clamp (top half) U-bolt Washer Nut Coupling flange (option) Bolt

POS.No. 10 11 12 13 14 15 16

NAME Nut Washer Locking plate (option) Packing Bolt Washer Blade

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13.

Reference to Standards/Procedures/LiteratureHeat-treatable steel, alloy steels and free cutting steels. Part 13: Wrought stainless steels Mechanical vibration. Balance quality requirements of rigid rotors Mechanical vibration of machines with operating speeds from 10 to 200 rev/s. Basis for specifying evaluation standards.

EN 10088 ISO 1940 ISO 10816-1

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.

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