MSL vertical split case pump_Hunan M&W Pump Co., Ltd

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
Item	Pump Supporting program A	1	2	Pump Supporting program B	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
Type		（m³/h）	（l/s）	（m）	（r/min）	（kw）	（kw）	（%）	（m）	The structural form
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
150MS78	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
200MS42	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
200MS63	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
200MS95	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
250MS14	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
250MS24	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
Type		（m³/h）	（l/s）	（m）	（r/min）	（kw）	（kw）	（%）	（m）	The structural form
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
250MS39	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
250MS65	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
300MS12	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
300MS19	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
300MS32	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
Type		（m³/h）	（l/s）	（m）	（r/min）	（kw）	（kw）	（%）	（m）	The structural form
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
350MS16	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
350MS26	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
350MS44	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
500MS22	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
500MS35	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
Type		（m³/h）	（l/s）	（m）	（r/min）	（kw）	（kw）	（%）	（m）	The structural form
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
600MS32	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
600MS47	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
600MS75	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
600MS100	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
700MS35	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
Type		（m³/h）	（l/s）	（m）	（r/min）	（kw）	（kw）	（%）	（m）	The structural form
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
700MS56	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
800MS24	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
800MS32	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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