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Страница: 12 / 36

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gl

is

h (
G

B)

12

3.5.4 Inlet pipe if the feed line comes in different horizontal planes

Avoid high spots, such as loops, as they will collect
air and throttle the system or lead to uneven
pumping.

3.5.5 Inlet pipe with a horizontal elbow in the feed line

Make sure that the liquid flow is evenly distributed to
both sides of the double-suction impeller.
There is always an uneven, turbulent flow through an
elbow. See below. If you install an elbow in the inlet
pipe near the pump in a position other than vertical,
more liquid will enter one side of the impeller than
the other. This will result in heavy, unbalanced thrust
loads overheating the bearings, causing rapid wear
and reducing the hydraulic performance.

Correct

Wrong

TM

04

00

95

490

7

TM

04

00

94

490

7

Fig. 14

Correctly mounted inlet pipe

Fig. 15

Inlet pipe resulting in air pockets

Eccentric reducer

Eccentric reducer

Air pocket

Correct

Wrong

TM

04

01

5

0

49

07

-

T

M0

7 2

9

0

8

4

41

8

TM

04

01

4

9

49

07

Fig. 16

Recommended inlet pipe installation
with a length of straight pipe between
horizontal elbow and pump

Fig. 17

Unbalanced loading of a double-suction
impeller due to uneven flow through a
horizontal elbow close to the pump

DN

10 x DN



10 x DN plus

expansion joint

DN

[

DN

3-5 x DN plus
expansion joint

Open system

Closed system

Uneven flow

Water pressure

increases here

causing a

greater flow to

one side of the

impeller than to

the other

«
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14
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Содержание LS Series

Страница 1: ...LS Horizontal split case pump Installation and operating instructions GRUNDFOS INSTRUCTIONS Installation and operating instructions http net grundfos com qr i 99536991 ...

Страница 2: ... 3 1 Location 4 3 2 Mechanical installation 4 3 3 Electrical connection 8 3 4 Pipes 9 3 5 Inlet pipe guidelines 11 4 Starting up the product 13 4 1 General information 13 4 2 Prestart checks 13 4 3 Priming 14 4 4 Startup 15 4 5 Final alignment 16 4 6 Greasing the grid coupling 17 5 Product introduction 18 5 1 Applications 18 5 2 Pumped liquids 18 5 3 Identification 18 6 Servicing the product 21 6 ...

Страница 3: ... extended periods of time Attach a covering structure or an additional cover when using or storing the product outdoors Before and during storage we recommend these precautions 1 Make sure that the bearings are filled with the recommended grease to prevent moisture from entering around the shaft See section 6 3 3 Lubrication 2 Make sure that the inlet and outlet ports and all other openings are co...

Страница 4: ...d rigid support for the entire pump The foundation must be capable of absorbing any vibration normal strain or shock We recommend that the weight of the concrete foundation is 3 times the weight of the complete pump unit For specific requirements consult the contractor engineer or established industry standards In installations where silent operation is particularly important we recommend a founda...

Страница 5: ...imum inlet conditions and minimum pressure drop on the outlet side At flow velocities greater than 2 4 m s we recommend that you fit larger expansion joints matching the pipes 3 2 5 Foundation and preliminary alignment procedure The foundation and preliminary alignment procedure has four steps 1 pouring of foundation 2 shimming of base frame 3 preliminary alignment 4 grouting Pouring of foundation...

Страница 6: ... sitting down at a table and finding that the table rocks when someone leans on it Technically it is a condition where the feet of a motor or a pump are not at the same level as the base plate To check for soft foot set the pump or motor on its base plate and bolt it down Set a dial gauge on one foot loosen the hold down bolt and watch the dial gauge If the dial gauge indicator moves while looseni...

Страница 7: ...concrete foundation thoroughly then remove surface water 3 Fill the formwork with grout up to the top edge of the base frame See fig 8 Allow the grout to dry thoroughly before attaching the pipe to the pump 24 hours is sufficient time with approved grouting procedure 4 When the grout has thoroughly hardened check the anchor bolt nuts and tighten them if necessary 5 Approximately two weeks after th...

Страница 8: ...upply has been switched off and that it cannot be accidentally switched on DANGER Electric shock Death or serious personal injury Whenever you use powered equipment in explosive surroundings observe the rules and regulations generally or specifically imposed by the relevant responsible authorities or trade organisations If in doubt whether the supplied motor can handle frequency converter operatio...

Страница 9: ...ad You can avoid many NPSH problems if you install the inlet pipe properly See section 3 4 1 General precautions In section 10 Disposing of the product common inlet pipe installations are illustrated for two situations flooded systems Closed systems and open systems where the liquid level is above the pump inlet suction lift systems Closed systems and open systems where the liquid level is below t...

Страница 10: ...tted with mechanical seals Seals requiring recirculation will normally be provided with a flushing pipe from the pump casing 3 4 6 Measuring instruments To ensure continuous monitoring of operation we recommend that you install pressure gauges on the pump inlet and outlet flanges The pressure gauge on the inlet side must be capable of measuring vacuum The pressure tappings must only be opened for ...

Страница 11: ...pe will be filled with air and thus prevent proper operation of the pump When reducing the pipe to the inlet port diameter use an eccentric reducer with the eccentric side down to avoid air pockets Correct Wrong TM04 0093 4907 TM04 0092 4907 Fig 9 Correctly mounted reducer Fig 10 Reducers resulting in air pockets and turbulence Eccentric reducer Turbulent flow Air pocket Concentric reducer Correct...

Страница 12: ... in heavy unbalanced thrust loads overheating the bearings causing rapid wear and reducing the hydraulic performance Correct Wrong TM04 0095 4907 TM04 0094 4907 Fig 14 Correctly mounted inlet pipe Fig 15 Inlet pipe resulting in air pockets Eccentric reducer Eccentric reducer Air pocket Correct Wrong TM04 0150 4907 TM07 2908 4418 TM04 0149 4907 Fig 16 Recommended inlet pipe installation with a leng...

Страница 13: ...on of rotation 4 2 1 Bearings Make sure that all bearings are properly lubricated See section 6 3 3 Lubrication 4 2 2 Stuffing boxes Make sure that the stuffing box packing rings have been properly tightened 4 2 3 Pressure gauges Make sure that the pressure gauge connections are closed TM04 0096 4907 Do not start the pump until it has been filled with liquid and vented CAUTION Biological hazard Mi...

Страница 14: ...ith liquid and vent them before the pump is started Proceed as follows Suction lift system with foot valve 1 Close the outlet isolating or throttle valve and open the isolating valve in the inlet pipe 2 Remove the vent screw and connect a priming device to a drain hole 3 Fill the inlet pipe and casing with liquid at a pressure of 1 to 2 bar from an external source until the inlet pipe and pump are...

Страница 15: ... exceeds the rated performance range or the differential pressure is lower than the rated performance range 4 Adjust the stuffing box gland stuffing boxes only With the pump running tighten the stuffing box gland to allow a leakage of 40 60 drops per minute This is required for shaft sleeve lubrication Tighten the stuffing box gland evenly to provide uniform compression on the packing rings After ...

Страница 16: ...0 9 o clock 2 Set the dial gauge pointer to zero turn the motor and pump shaft to 90 3 o clock and check that the index lines are still in line 3 Read the dial gauge If the dial gauge shows a deflection exceeding 0 2 mm move the motor sideways until the reading of the dial gauge is within the allowable tolerance of 0 2 mm 4 Remove the dial gauge 2 Angular alignment horizontally 1 Mount the dial ga...

Страница 17: ...the grid See section 6 3 3 Lubrication Position the seals on the hubs so they line up with the grooves in the coupling cover Position the gaskets on the flanges of the lower coupling cover half and assemble the covers so that the matching marks are on the same side Push the gaskets in until they stop against the seals and secure the coupling cover halves with the fasteners provided and tighten the...

Страница 18: ...rther information contact Grundfos 5 3 Identification The type designation and rating information of Grundfos horizontal split case pumps are stated on the nameplate See fig 21 The type designation includes model number size and type Permanent records for this pump are kept under its year week code and serial number fig 21 4 and 5 and this number must therefore be stated in all correspondences and...

Страница 19: ...separate base frames spacer coupling 5 Grease lubrication bare shaft pump with separate base frame spacer coupling 6 Oil lubrication pump with motor common base frame standard coupling 7 Oil lubrication bare shaft pump with common base frame standard coupling 8 Oil lubrication bare shaft pump 9 Oil lubrication pump with motor separate base frames spacer coupling 0 Oil lubrication bare shaft pump w...

Страница 20: ...FKM SAQE Rubber bellows seal balanced carbon SiC EPDM SAQV Rubber bellows seal balanced carbon SiC FKM BBQE Rubber bellows seal unbalanced carbon SiC EPDM BBQV Rubber bellows seal unbalanced carbon SiC FKM ABQE O ring seal unbalanced carbon SiC EPDM ABQV O ring seal unbalanced carbon SiC FKM DBQE O ring seal balanced carbon SiC EPDM DBQV O ring seal balanced carbon SiC FKM SBQE Rubber bellows seal...

Страница 21: ...you notice any defects Do not start the pump unless the defects have been remedied See section 8 Fault finding the product Report immediately to the supplier that you cannot remedy the defects 6 3 Maintaining the product 6 3 1 General information Routine maintenance is essential to maintain the pump in a good condition A high degree of cleanliness must be maintained during all maintenance procedur...

Страница 22: ...the bearing caps For every 10 000 operating hours or every two years 1 Remove the bearing caps from pump 2 Remove old grease 3 Thoroughly clean the bearing caps 4 Refill the bearings with fresh grease 5 Refill the bearing caps completely with fresh grease 6 Refit the bearing caps in accordance with the assembly instructions 7 Start the pump briefly several times to distribute the grease in the bea...

Страница 23: ... the coupling guards again 7 Taking the product out of operation The following shutdown procedures apply to most normal shutdowns If the pump is to be inoperative for a long time follow the storage procedures in section 7 2 Long term shutdown 1 Always close the outlet or throttle valve before stopping the pump Close the valve slowly to prevent hydraulic shock but make sure that the pump does not r...

Страница 24: ...You can prevent freezing of pumped liquid by filling the pump with antifreeze solution 2 Rotate the shaft by hand monthly to coat the bearings with lubricant and delay oxidation and corrosion 3 Where applicable follow the motor manufacturer s storage recommendations CAUTION Hot or cold surface Minor or moderate personal injury Make sure that the escaping water does not cause injury to persons or d...

Страница 25: ... G H I J K The pump is not primed lack of priming liquid incomplete priming 1 Loss of priming liquid 2 The suction lift or static lift is too high 3 The outlet pressure is too high measured at the outlet port 4 The speed is too low 5 Wrong direction of rotation 6 The impeller is completely clogged 7 The inlet pipe is partially blocked 8 Air leak in the inlet pipe or flange 9 Air leak in the stuffi...

Страница 26: ...e lubricating oil or grease is dirty or contaminated 27 Faults Causes No Cause Remedy 1 The pump is not primed lack of priming liquid incomplete priming Fill the pump and inlet pipe completely with pumped liquid 2 Loss of priming liquid Mend possible leaks in the inlet pipe joints and fittings Vent the pump casing to remove accumulated air 3 The suction lift or static lift is too high Reduce the d...

Страница 27: ...d duty point on the pump curve The result is lower head higher flow and higher power consumption Install an orifice plate immediately after the outlet flange The orifice plate will raise the system characteristic or increase the counterpressure thus increasing the head and lowering the flow The size of the orifice plate must be adapted so that the pressure corresponds to the required duty point 20...

Страница 28: ...of 70 C If the pump is installed 4750 metres above sea level the motor must not be loaded by more than 89 of the rated output In cases where both the maximum temperature and the maximum altitude are exceeded the derating factors must be multiplied 0 89 x 0 89 0 79 9 1 2 Liquid temperature The maximum liquid temperature marked on the pump nameplate depends on the mechanical shaft seal used Motor ma...

Страница 29: ...mum flow rate stated on the nameplate or with the outlet isolating or throttle valve closed Operating the pump under such conditions may involve the risk of the pump being overheated To prevent possible damage use protective devices such as liquid temperature relay bearing temperature relay inlet pressure monitoring etc If a pump is operated at reduced head the flow rate will increase and the moto...

Страница 30: ...Gray cast iron ductile iron 400 5219 4218 4689 8182 2031 2340 2855 4208 Gray cast iron ductile iron 450 5866 4748 5278 9202 2502 2884 3517 5180 Gray cast iron ductile iron 500 6514 5278 5866 10222 3017 3473 4253 6269 Gray cast iron ductile iron 550 7161 5808 6455 11242 3590 4135 5033 7446 Gray cast iron ductile iron 600 7809 6337 7044 12263 4238 4885 5945 8800 Gray cast iron ductile iron 700 9131 ...

Страница 31: ...less steel 550 17903 14519 16137 28106 11968 13783 16775 24819 Stainless steel 600 19522 15843 17609 30656 14126 16285 19816 29332 Stainless steel 700 22828 18491 20556 35816 18909 21776 26508 39250 Stainless steel 800 26092 21137 23499 40940 24437 28135 34233 50733 Stainless steel 900 29356 23782 26442 46064 30702 35343 42986 63748 Stainless steel 1000 32621 26428 29385 51188 37705 43398 52766 78...

Страница 32: ... 57 63 7 5 60 58 66 11 60 60 66 15 60 60 66 18 5 60 63 66 22 66 63 66 30 71 65 59 37 71 66 60 45 71 66 58 55 71 67 58 75 73 70 61 90 73 70 61 110 76 70 61 132 76 70 61 160 76 70 65 200 76 70 250 82 73 315 82 73 355 77 75 400 75 2 pole n 3500 min 1 4 pole n 1750 min 1 6 pole n 1170 min 1 Motor kW Maximum sound pressure level dB A ISO 3743 Three phase motors 2 pole 4 pole 6 pole 0 25 0 37 0 55 0 75 ...

Страница 33: ...earest Grundfos company or service workshop The crossed out wheelie bin symbol on a product means that it must be disposed of separately from household waste When a product marked with this symbol reaches its end of life take it to a collection point designated by the local waste disposal authorities The separate collection and recycling of such products will help protect the environment and human...

Страница 34: ...ro Tlf 45 87 50 50 50 Telefax 45 87 50 51 51 E mail info_GDK grundfos com www grundfos com DK Estonia GRUNDFOS Pumps Eesti OÜ Peterburi tee 92G 11415 Tallinn Tel 372 606 1690 Fax 372 606 1691 Finland OY GRUNDFOS Pumput AB Trukkikuja 1 FI 01360 Vantaa Phone 358 0 207 889 500 France Pompes GRUNDFOS Distribution S A Parc d Activités de Chesnes 57 rue de Malacombe F 38290 St Quentin Fallavier Lyon Tél...

Страница 35: ...020 1426 sk grundfos com Slovenia GRUNDFOS LJUBLJANA d o o Leskoškova 9e 1122 Ljubljana Phone 386 0 1 568 06 10 Telefax 386 0 1 568 06 19 E mail tehnika si grundfos com South Africa Grundfos PTY Ltd 16 Lascelles Drive Meadowbrook Estate 1609 Germiston Johannesburg Tel 27 10 248 6000 Fax 27 10 248 6002 E mail lgradidge grundfos com Spain Bombas GRUNDFOS España S A Camino de la Fuentecilla s n E 281...

Страница 36: ...2303 Trademarks displayed in this material including but not limited to Grundfos the Grundfos logo and be think innovate are registered trademarks owned by The Grundfos Group All rights reserved 2020 Grundfos Holding A S all rights reserved ...

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