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MSL vertical split case pump

Main performance parameters
● Pump outlet diameter Dn: 100~1200mm
● Capacity Q: 70~22392m3/h
● Head H: 8~150m
● Temperature T: -20℃~200℃
● Solid parameter ≤80mg/L
● Permissible pressure ≤4Mpa
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Product Description
Structure Feature
Technical Data
Precautions
Troubleshooting
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MSL type pump is S series of the renewal of energy-efficient products, widely used in modern urban water supply and sewerage, power generation, industrial process water intake, compression, irrigation systems and hydraulic engineering, petrochemical engineering and so on.

 

MSL type pump adopts national standard specification for design, its serialization, standardization, high degree of generalization, superior performance, stable operation, safe and reliable. New structures be used in the design, easy to maintain, repair and maintenance; introducing new material may be applicable multiple media to delivery.

 

Main performance parameters

Pump outlet diameter

Capacity

Head

Temperature

Solid parameter

Permissible pressure

 

Dn:100~1200mm

Q: 70~22392m3/h

H: 8~150m

T: -20℃~200℃

≤80mg/L

≤4Mpa

 

 

Description of Pump Type

For example:500MS35A-L-M(F、Y)-J

500 The diameter of the inlet (mm)

MS Single stage double suction, centrifugal split case pump

35 Head(m)

A-Changed outer diameter of impeller (the max diameter without mark)

L-Vertical type

M-Anti-frication

F-Anti-corrosion

Y-Anti-oil

J-Pump speed changed(Maintain the speed without mark)

 

Pump Supporting program

 

Item

Pump Supporting program A

Pump Supporting program Q

Pump Supporting program B

Pump Supporting program S

1

2

1

2

3

 

Pump casing

Grey cast iron

 

Ductile cast iron

 

Ductile cast iron

Extra low carbon stainless steel

Ni-Cr chromium

cast iron

Ductile cast iron

Stainless steel

Impeller

Grey casting iron

Cast steel

Stainless steel

Duplex S.S.

Tin bronze

Tin bronze

Tin bronze

Shaft

#45 steel

#45 steel

Stainless steel

Duplex S.S.

2Crl3

2Crl3

2Crl3

Shaft sleeve

#45 steel

#45 steel

Stainless steel

Extra low carbon stainless steel

 

lCrl8Ni9Ti

 

lCrl8Ni9Ti

 

lCrl8Ni9Ti

Wear ring

Grey casting iron

 

Cast steel

Cast steel

Duplex S.S.

Tin bronze

Tin bronze

Tin bronze

 

 

Services

 

For pure water and lower strength applications

 

For pure water high strength applications

For media with more solid impurities PH<6   chemical corrosion and for high strength applications

 

 

 

The sea water pump

These configurations are recommended by the manufacturer, customers could change their materials according to specific needs

Construction drawing  vertical  MSL

 

 

We could not find any corresponding parameters, please add them to the properties table

1. Structure of casing: Open structure in axial, inlet and outlet of the pump both on the pump body, and in the same plane perpendicular to the axis. Easy to lay pipes and repair (when repairing, open the pump cover and rotor parts without removing inlet and outlet of pipes and motor).

 

2. Structure of rotor: Adopt double-suction impeller, using its symmetric arrangement of leaves to balance the effect of the radial force. Impeller fixed on the shaft relying on either side of the shaft sleeve and sleeve nut, align axial position accurately by adjusting the sleeve nut. Both ends of the shaft support structure connect motor directly through elastic pin coupling, effectively reducing mechanical losses; deep groove ball bearings and grease lubrication insure smooth operation.

 

3. Vortex structure: Pump body, pump cover and impeller constitute the suction Chamber and water pressure Chamber. Install a seal ring between the suction chamber and water pressure chamber to reduce water leakage from water pressure Chamber back to the suction Chamber, which reduces the capacity of losses, while effective protect the pump body, extending the life of pump case. On in and out of the flange, reserved the installation of spiral hole for vacuum and pressure gauges; on lower portion of in and out of the flange, reserved spiral hole of drainage for easy Automation Control System access.

 

4. Structure of shaft seal: There are packing seals and mechanical seals, may also adopt soft packing seals according to special requirements. Depending on the media properties water seal water (washing water) can use water of pressure chamber or external supply water.

 

Type

Capacity

Head

Speed

 

Shaft

power

Motor power

EFF

NPSH

The structural

form

(m³/h)

(l/s)

(m)

(r/min)

(kw)

(kw)

(%)

(m)

150MS50

 

130

160

220

36.1

44.4

61.1

52

50

40

2980

25.3

27.3

31.1

37

72.9

80

77.2

3.9

Structure drawing I

A

112

144

180

31.1

40

50

43.8

40

35

2980

18.5

20.9

24.5

30

72

75

70

3.9

B

103

133

160

28.6

36.9

44.4

38

36

32

2980

17.2

18.6

19.4

22

65

70

72

3.9

150MS78

 

126

160

198

35

44.4

55

84

78

70

2980

40

45

51

55

72

75

74

5.9

A

112

144

180

31.1

40

50

67

62

55

2980

30

33.8

33.5

45

68

72

70

5.9

150MS97

 

126

180

216

35

50

60

104

97

87

2980

49

59

64

75

73

80

79

3.8

A

119

170

204

33

47.2

56.6

91

85

76

2980

42

50

55

75

70

78

77

3.7

J

72

90

108

20

25

30

24

22.5

20

1480

6.5

7.5

8.5

11

73

74

70

2.7

200MS42

 

216

280

342

60

77.7

95

48

42

35

2980

34.8

38.1

40.2

55

81

84.2

81

5.4

A

198

270

310

55

75

86.1

43

36

31

2980

30.5

33.1

34.4

37

76

80

76

5.4

200MS63

 

216

280

351

60

77.7

97.5

69

63

50

2980

54.8

58.3

66.4

75

74

82.7

72

5.4

A

180

270

324

50

75

90

54.5

46

37.5

2980

41.1

45.1

47.3

55

70

75

70

5.4

200MS95

 

183

280

324

50.8

77.7

90

103

95

85

2980

83.1

91.7

100

110

62

79.2

75

4.7

A

198

270

310

55

75

86.1

94

87

80

2980

74.5

85.5

91.1

110

68

75

74

4.5

250MS14

 

360

485

576

100

134.7

160

17.5

14

11

1480

21.4

21.5

22.1

30

80

85.8

78

3.2

A

320

430

504

88.8

119.4

140

13.7

11

8.6

1480

15.4

15.8

15.8

22

78

82

75

3.2

250MS24

 

360

485

576

100

134.7

160

27

24

19

1480

33.1

36.9

36.4

55

80

85.8

82

3.5

A

342

414

482

95

115

133.8

22.2

20.3

17.4

1480

25.8

27.6

28.6

30

80

83

80

3.5

 

Type

Capacity

Head

Speed

Shaft

power

Motor power

EFF

NPSH

The structural

form

(m³/h)

(l/s)

(m)

(r/min)

(kw)

(kw)

(%)

(m)

250MS39

 

360

485

612

100

134.7

170

42.5

39

32.9

1480

54.8

61.5

68.6

75

76

84

79

3.2

Structure drawing I

A

324

468

576

90

130

160

35.5

30.5

25

1480

42.5

49.3

50.9

55

74

79

77

3.2

250MS65

 

360

485

612

100

134.7

170

71

65

56

1480

92.8

109

129.6

132

75

79

72

6.7

A

338

462

535

93.8

128.3

148.6

60

53

49

1480

73.6

84.4

95.2

110

74

77

75

6.7

250MS110

 

400

545

600

111.1

151.3

166.6

115

110

102.4

1480

169

206.6

217

250

74

79

77

2.3

300MS12

 

612

790

900

170

219.4

250

14.5

11.25

10

1480

30.2

31.1

33.1

37

80

85

74

5.8

A

515

675

781

143

187.5

216.9

11.5

9.7

8.5

1470

22.1

22.9

23.8

30

72

78

76

5.8

300MS19

 

612

790

935

170

219.4

259.7

22

19

14

1480

45.9

47

47.6

55

80

87

75

5.8

A

485

693

798

134.7

192.5

221.6

18.5

14.8

12.1

1480

34.4

34.9

35.1

45

71

80

75

5.8

300MS32

 

612

790

960

170

219.4

266.6

38

32

29

1480

76.2

79.2

95

110

83

87

80

5.8

A

537

702

720

149.1

195

200

29.5

24.7

22.8

1480

53.9

56.2

62.9

75

80

84

78

5.8

300MS58

 

576

790

972

160

219.4

270

65

58

50

1480

136

148.5

165.5

185

75

84

80

5.8

A

529

720

893

146.9

200

248

55

49

42

1480

99.2

118.6

131

160

79

81

78

5.8

B

504

684

835

140

190

231.9

47.2

43

37

1480

88.8

100

108

132

73

90

78

5.8

300MS90

 

590

790

936

163.8

219.4

260

93

90

82

1480

202

242

279

315

74

80

75

5.8

A

576

756

918

160

210

255

86

78

70

1480

190

217

247

280

71

74

71

5.8

B

540

720

900

150

200

250

72

67

57

1480

151

180

200

220

70

73

70

5.8

 

Type

Capacity

Head

Speed

Shaft

power

Motor power

EFF

NPSH

The structural

form

(m³/h)

(l/s)

(m)

(r/min)

(kw)

(kw)

(%)

(m)

350MS16

 

972

1260

1440

270

350

400

20

16

13.4

1480

64

64.5

71

75

83

86

74

5.3

 

Structure drawing I

A

800

967

1167

222.2

268.6

324.1

13.7

11.5

8.6

1480

40.3

38.8

39

55

74

78

70

5.3

350MS26

 

972

1260

1440

270

350

400

32

26

22

1480

99.7

101.5

105

132

85

88

82

5.3

A

843

1088

1264

234.1

302.2

351.1

24.7

20.4

15.7

1480

70.9

72.8

74

90

80

83

73

5.3

350MS44

 

972

1260

1476

270

350

410

50

44

37

1480

164

177.6

189

220

81

87

79

5.3

A

876

1260

1476

243.3

350

410

42

37

31

1480

125.2

151.1

155.8

200

80

84

80

5.3

350MS75

 

972

1260

1440

270

350

400

80

75

65

1480

271

304

349

355

78

85

80

5.3

A

900

1170

1332

250

325

370

70

65

56

1480

220

247

257

280

78

84

79

5.3

B

813

1060

1202

225.8

294.4

333.8

57

53

45.8

1480

168

187

195

220

75

82

77

5.3

350MS125

 

850

1260

1660

236.1

350

461.1

140

125

100

1480

462

531

623

710

70

81

72.5

5.3

A

787

1157

1538

218.6

321.3

427.2

120

107

86

1480

367

432

515

560

70

78

70

5.3

B

697

1027

1363

193.6

285.2

378.6

94

84

67

1480

255

305

343

400

70

77

72.5

5.3

500MS13

 

1620

2020

2340

450

561.1

650

15

13

10.4

980

83.8

86.2

82.8

110

79

83

80

5.7

500MS22

 

1620

2020

2340

450

561.1

650

24.5

22

19.4

980

140.4

144.1

145.5

185

77

84

85

5.2

A

1400

1746

2020

388.8

485

561.1

20

17

14

980

103

101

93.9

132

74

80

82

5.2

500MS35

 

1620

2020

2340

450

561.1

650

40

35

28

980

207.6

219

209.9

280

85

88

85

5.8

A

1400

1746

2020

388.8

485

561.1

31

27

21

980

144

151

138

220

82

85

84

5.8

 

Type

Capacity

Head

Speed

Shaft

power

Motor power

EFF

NPSH

The structural

form

(m³/h)

(l/s)

(m)

(r/min)

(kw)

(kw)

(%)

(m)

500MS59

 

1620

2020

2340

450

561.1

650

68

59

47

980

379.7

391

374.4

450

79

83

80

4.5

Structure drawing I

A

1500

1872

2170

416.6

520

602.7

57

49

39

980

315

333

320

400

74

75

72

4.5

B

1400

1746

2020

388.8

485

561.1

46

40

32

980

240.2

257

247.9

315

73

74

71

4.5

500MS98

 

1620

2020

2340

450

561.1

650

114

98

79

980

644.8

678

68.3

800

78

79.5

74

4

A

1500

1872

2170

416.6

520

602.7

96

83

67

980

509.3

540

542.4

630

77

78.5

73

4

B

1400

1746

2020

388.8

485

561.1

86

74

59

980

431.4

452

432.8

560

76

78

75

4

600MS22

 

2536

3241

3804

704.4

900.2

1056.6

27.6

22

18

980

226.8

231.8

232.1

250

86

88

79

7.5

600MS32

 

2700

3240

3600

750

900

1000

33.5

32

26

980

291

317

298

400

85

89

84

7.5

A

2520

3000

3165

700

833.3

879.1

25.5

23

19.2

980

205.8

211

196.9

250

85

89

84

7.5

600MS47

 

2160

3170

3600

600

880.5

1000

56.6

47

40.5

980

415.4

455.9

461.7

560

80

88

86

7.5

A

2400

2920

3500

666.6

811.1

972.2

45

42

35

980

352.5

380

402.2

500

83.5

88

83

7.4

600MS75

 

2592

3060

3600

720

850

1000

78

75

69

980

644.3

694.4

760

900

87

88

80

8.7

A

2338

3084

3248

649.4

856.6

902.2

63.5

57.8

56.2

980

467

539

552

710

85.5

90

89

7.3

600MS100

 

2592

3240

3888

720

900

1080

103

100

96

980

870

1003

1100

1250

80

88

89

7.2

A

2352

2940

3528

653.3

816.6

980

91

87.5

84

980

620

710

800

900

80

88

86

6.8

700MS24

 

3840

4800

5760

1066.6

1333.3

1600

31

24

18

980

395

352.5

340

400

81

89

82

8.6

structure drawing II

700MS35

 

3840

4800

5760

1066.6

1333.3

1600

42

36

28

980

522.9

580.5

630.2

630

86

90

81

8.6

A

3600

4500

5400

1000

1250

1500

38

32.5

24

980

447.9

480.9

530.5

500

85

89

80

8.4

 

Type

Capacity

Head

Speed

Shaft

power

Motor power

EFF

NPSH

The structural

form

(m³/h

(l/s

(m

(r/min

(kw

(kw

(%

(m

700MS56

 

3840

4800

5760

1066.6

1333.3

1600

64

56

47

980

770

813.4

910

900

87

90

83

8.6

structure drawing II

A

3400

4500

5400

944.4

1250

1500

56

51

39

980

620

702.2

755

800

84

89

80

8.4

700MS90

 

4000

4700

5500

1111.1

1305.5

1527.7

97

90

77

980

1201

1281

1358

1600

88

90

85

9.4

700MS135

 

2720

3400

4080

755.5

944.4

1133.3

137

135

130

800

1335.3

1524.4

1699.3

1765

76

82

87

5.7

800MS22

 

4320

5500

6840

1200

1527.7

1900

25

22

19

730

358

370

385

450

82

89

86

7

800MS24

 

5250

7000

8400

1458.3

1944.4

2333.3

27.5

24

200

730

479

506

532

560

82

90

86

8.7

A

4840

6250

7740

1344.4

1736.1

2150

23.6

21

17.2

730

382

406

429

500

81.5

88

84.5

8.7

800MS32

 

4320

5500

6480

1200

1527.7

1800

35

32

29

730

502.2

538.5

588.2

630

82

89

87

7.2

A

3500

4950

6000

972.2

1375

1666.6

30

26

23

730

353

398.3

437

500

81

90

88

7.2

800MS47

 

4320

5500

6480

1200

1527.7

1800

51

47

42

730

740.7

782.2

842.2

900

81

90

88

7.2

A

3500

5070

6000

972.2

1408.3

1666.6

45

40

36

730

529.5

620.5

684

800

81

89

86

7.2

J

300

4400

5200

83.3

1222.2

1444.4

35

30

26

590

357.4

403.9

428.1

450

80

89

86

7.2

800MS48

 

4056

5070

6084

1126.6

1408.3

1690

57

48.5

39

595

777

752

734

1000

85

89

88

5.8

800MS75

 

5920

7360

8075

1644.4

2044.4

2243

76

72

69

740

1426

1570

1760

1600

86

92

89

8.4

A

4750

6080

6745

1319.4

1688.8

1873.6

61

58

55

740

929

1056

1162

1400

85

91

87

7.3

B

4370

5550

6175

1213.8

1541.6

1715.2

55

52.3

49.5

740

777

876

965

1120

84.3

90.3

86.3

6.6

800MS80

 

5356

6696

8035

1487.7

1860

2231.9

87

80

72

740

1540

1603

1720

2000

86

91

90

9

900MS23

 

6000

7500

9000

1666.6

2083.3

2500

27.5

23

18

730

630

610

590

630

79

86

84

7.5

 

1. Inspection before starting

Be sure to check the followings:

(1) Insure pump plate fixed on foundation;

(2) Insure coupling and pump unit alignment;

(3) Insure piping connected by requirements;

(4) Insure motor installed by Installation and operation instruction;

(5) Insure the rotor of pump rotate easily (at least a circle);

(6) Insure the coupling guard installed;

(7) Insure the operator fully understand the safety specification that they should obey and the failures may be occurred;

(8) Insure the shaft seal liquid or cooling liquid lead-in by requirements;

(9) Insure the shaft seal installed by operation instruction;

(10) Insure the auxiliary device installed by operation instruction (If they exist);

(11) nsure the bearing have lubricated well, especially insure new pump grease or thin oil do not reduce or go bad;

(12) Insure the air trapped in pump escaped。

 

2. Shaft Seal

Open valves properly for stuffing box seal

 

3. Air exhaust

Pump and piping should fill of medium before starting, there are two methods: creation of vacuum or priming. If the pump operated on the suction state, exit gas by bolt hole on top of the pump casing.

Note: When creation of vacuum, evacuate air by bolt hole on top of the pump casing. When priming, open both side low pressure volute chamber of pump casing and the top plug, to get rid of pump vibration by remained air in pump.

 

4. Starting

(1) Close outlet valve;

(2) Open inlet valve completely;

(3) Open all auxiliary piping (cooling, heating, sealing, rinsing and lubricant liquid), and check all capacity and pressure;

(4) Starting pump after finishing above procedures;

(5) When the system starting deliver medium and the pressure reading at pressure gauge rise up, open outlet valve slowly。

Note: Forbid pump operating without liquid! Only close outlet valve when the pump start and shutdown, otherwise will damage the pump by overheating.

 

5. Operation

(1)

Confirm operating point

 

According to Q-H performance curve of pump, capacity Q varies with the actual operation head. The head depended on the system head (including the altitude difference between inlet and outlet, piping, valves, radiator and so on). So the pump actually operating point B depends on pump performance

curve Q-H and system performance curve Q-HA.

Once capacity settled, the shaft power, efficiency, NPSH settled as well. Pump has limited working range. The minimum capacity are shown as Qmin in Q-H performance curve. Maximum capacity are depended on the cross point of pump tolerance NPSH and system valid NPSHA. Adjust valve can change performance curve Q-HA of system, thereby adjust operation performance, makes pump operation stable and high efficiency.

(2) Operation management

Should pay attention to followings:

a. Pump should work stably

b. Forbid pump operating without liquid

c. To prevent medium temperature rise up, pump can not be run long period when close outlet valve

d. Generally, the bearing temperature not higher than 35℃ of ambient temperature, absolute

operation temperature less than 100℃.

e. Check oil level regularly if use thin oil. Deep groove ball bearing of grease lubrication no need routine maintenance.

f. Do not close inlet valve (if it is exist) when pump operating.

g. Periodical inspection and start jury pump.

h. Check auxiliary piping whether connected well.

i. Check elastic element of coupling, if worn replace immediately.

j. For stuffing box seal there should have a slight drip when running, push stuffing box gland gently until there is a slight drip (about 15-30 drop/min ).

For mechanical seal the seal leakage should reduce gradually. It is about 0-5drop/min after

starting few hours. If the seal leakage increase gradually and reach about 30-60drop/min, should check or adjust mechanical seal.

 

6. Shutdown

Close discharge valve.

Insure the pump unit stop smoothly when shutdown the motor. Pump should have a proper after-running period, cut heat source at this time, so that the delivered medium can cool down completely and avoid of producing any heat inside pump.

Close suction valve if pump stop work for a long period of time.

Close auxiliary piping, the shaft seal should use seal lubricant even though at stopped state. Evacuate all medium in pump and piping when freeze or stop work for a long-term, so as not to frost crack.

 

7. Storage

Every pump has inspected strictly before delivery. Recommend to adopt following procedures to store pump.

(1) Store new pump

If store pump at indoor, clean dry place and follow the storage requirements, the longest storage time is 12 months.

(2) If equipment is to be stored for long periods of time should follow below procedures.

a. Pump should keep in installation state and inspect work condition regularly. Start pump once every month or every three months (about 5 minutes). Check running condition before starting pump to insure there is enough liquid.

b. Dismantled pump from piping and check it according to section 5.1 to 5.4. Apply protective agent on inside pump casing especially the gap of the impeller, apply on suction and discharge, then cover the suction.

c. Operation after storage

Inspect and maintain completely before starting pump, especially shaft seal and bearing lubricant. Reinstall all safety protection devices according to requirement before starting.

Problem

Causes

Remedy

starting load too high

1. Starting without closing discharge valve;
2. packing too tight lead to lubricant water can not flow into;
3. Misguide by failing of overcurrent protector

1. Close the valve;
2. Loose packing or check the valve of water seal, check if packing ring against the nozzle of lubricant water,
3. Adjust current limiting threshold or repair overcurrent protector.

Packing overheating

1.Packing  too tight;
2.Cooling water can not flow into packing box;
3. Damage in the surface of shaft or shaft sleeve;

1. Loose packing properly;
2.Loose packing or check if the water seal pipe clogged;
3.Repair shaft or shaft sleeve;

Packing leakage excessive

1. Packing worn;
2. Packing too loose;
3. Shaft curved or vibration;
4. Wrong packing bind;
5. Unclean seal water wore shaft;
6. Shaft sleeve worn;
7. Wrong packing;
8.The pressure of seal chamber too high or too low;

1. Replace packing;
2. Tighten packing box gland or add more packing;
3.Align or replace shaft;
4. Rebind packing;
5.Filtrate or use exterior source as seal water, repair;
6.Replace shaft sleeve;
7.Replace packing;
8. Adjust the pressure and capacity of seal liquid or use a sealing liquid from an external source.

Mechanical seal leakage

1. The nominal pressure of mechanical seal lower than actual work pressure;
2.Unreasonable reduction of Mechanical seal mounting,friction components not contact effective;
3. The rust of shaft sleeve surface cause rotating seal ring of mechanical seal sealing failure;
4. The delivered medium physical and chemical property causes O-ring loss elasticity;
5. The delivered medium physical and chemical property causes spring mechanical seal of loss elasticity;
 6. Impurity enter friction components and damaged their surface;
7. The liquid of friction components volatilize that cause their surface burning-out;

1. Change the type of mechanical seal;
2. Reinstall;
3. Clean shaft sleeve or change their material;
4. Change material;
5. Replace or change material;
6. Filtrate or use exterior source as rinsing water;
7. Adjust rinsing medium or measure;

Bearings over heating

1.Improper centering;
2.Improper adjustment or resonance in piping;
3.Overlarge .axial force;
4.Unbalance rotor ;
5. The rigidity of foundation not enough;
6. Incorrect bearing installation or improper clearance;
7. Wore or loosened shaft;
8. Improper lubrication;
9. Oil splash ring can not get oil;
10. Poor circulation in pressure lube;

1. Readjust;
2.Readjust;reduce piping if necessary; use vibration-absorptive material;check and repair;
3. Check and adjust special working point;check capacity and running state;
4. Rebalance;
5.Strengthen the rigidity of foundation;
6. Check and choose bearing with properclearance;
7. Check and replace bearing;
8. Check the amount of oil first, too much or so little will affect operation, then check the quality of oil, especially applicable temperature;
9.Check and eliminate, the causes of can not get oil may related with oil quality, speed,wore of oil splash ring and oil circulation;
10. Check the system of pressure lube;

Vibration and noisy

1. Special working point B is not design point;not design point; low or high will cause vibration and noisy;
2. Insecure foundation;
3.Loosened anchor bolt;
4.Insecure piping supports;
5.Piping resonance;
6.Cavitations;
7. Air cell in medium or piping leakage;
8.clogged inlet or outlet of impeller;
9. Improper centering;
10. Unbalanced pump rotor or motor rotor;
11.Worn coupling pin or unhealthy coupling connection;
12. Worn bearing;
13. Shaft curved;
14. Friction in rotating elements;
15.Loosened or broken rotating elements;

1. Adjust system special working point or pump design parameters;
2. Strengthen foundation;
3. Tighten anchor bolt;
4. Strengthen piping supports;
5. Expanding the distance between pump discharge and elbow, use vibration-absorptive material in piping connection, adjust piping arrangements;
6. Rise water level, reduce suction line loss, increase suction pressure by using inlet throttle valve;improve pump cavitations performance;
7. Check and eliminate, add discharge valve;
8. Clean impeller, clean impurity of pump and piping, check strainer and suction nozzle;
9. Recentering;
10.Rebalance;
11. Replace pin, rotate coupling 180°, eliminate error of pin  hole, adjust the unit to insure there is a necessary clearance in coupling;
12. Repair or replace bearing;
13. Align or replace shaft;
14. Eliminate friction;
15. Eliminate, replace worn parts;

water attack

Air in pump or piping

Evacuate air and eliminate the causes

Pump starts pumping then stops

1. Clogged in suction line or impeller;
2.  Air  cell in piping;
3. Lift too high  valid NPSH too low;
4. Air enter shaft seal;
5. Water level decrease too much;

1. Clean impeller, clean impurity of strainer and suction piping;
2. Improve suction line, adjust piping arrangements, add discharge valve;
3. Increase entrance pressure, increase suction pressure by using inlet throttle valve; low the height of pump installation; change suction line if too much line loss;
4. Check pressure and amount of seal liquid if they are suitable operating requirements, replace packing or other shaft seal, check the mounting position of water seal ring;
5. Rise the lowest water level, increase entrance pressure, increase   suction   pressure by using   inlet   throttle   valve;

 

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Add: Jiuhua Industiral Park,Xiangtan City,Hunan Province,China

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Call us:+86-0731-55599916
            +86-18673110460

 

Hunan M&W Pump Co., Ltd   湘ICP备14003804号-2     www.300.cn      Manager

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