Audited Supplier
TZS Serise slurry pump
1 Years
1 Years
33 M
1167 L/Min
Diesel Engine or Motor
Single-Stage Pump
High Pressure Pump
Single Suction Pump
Horizontal Pump
Horizontal Split Pumps
Suction Centrifugal
Closed or Open
Pump, Pumps, Condensate Pump, Slurry Pump, Circulating Pump, Dredging Industry, Mining, Coal Plant
High Chrome Alloy B05 B07,Rubber Br26 Br55
40-550mm
Diesel/Electric
Mining, Power Plant, Metallurgy, Dredging
OEM
Negotiation
20~30 Days
Centrifugal Pump
Single-Stage Pump
Xingang
boda
Wooden Case or as Your Requirement
China
8413709990
Product Description
1.General
Horizontal slurry pumps are cantilevered centrifugal pumps. They have been designed for the handling of highly abrasive or corrosive high density slurries, which are widely used in Metallurgical, Mining, Coal, Petroleum & Chemical, Transportation, River & Channel dredging, Building material and Municipal projects. Its construction can be divided into following types based on the application ranges.
1.1 Type ----TZS, TZM, TZHS pumps are also called as heavy--duty pumps. They can be operated in multistage series installation within the maximum working pressure of various types of pump have fitted with thicker wear--parts and large--duty frame, suitably transporting highly abrasive high density slurry or lower density high head slurry. Above types of pumps also can be used in a certain corrosive slurries.
1.2 Type TZL pump can be also called as light--duty slurry pump. Compared with heavy duty slurry pump, this type of pump is high speed, smallest, light--weight and suitable for transporting fine particle lower density slurry ( the maximum concentration in weight does not exceed 30% ).
It can be used for transporting high density lower abrasive slurry too.
1.3 Type TZG gravel pump and type TZGH gravel pump is designed for high density and lower abrasive slurry, which are suitable for delivering gravel, mud and slurry contained larger solids not for corrosive slurry.
1.4 The wet parts of TZR pumps should be elastomer. Its casing,cover and driving can be exchanged with TZS, TZL types of pump for the fine particle and corrosive slurry.
Type notation:
TZ - -
Frame Form
Seal Form
Pump Type
Pump Series
Outlet Diameter ( inch )
For Example
100TZ R G PE
PE Type Frame Form
Gland Seal
Pump Type Rubber
TZ Series Slurry Pump Type
Outlet Diameter (Inch)
The construction diagram of type TZR pumps see in Fig.2.
The construction diagram of type TZL pump sees in Fig.3.
The construction diagram of type TZG./TZGH pump sees in Fig.4.
The construction for all types of horizontal slurry pump is similar, except for the pump head (included pump body, cover, impeller and etc...).All of them adopt the same series of driving. Its construction will be described according to the following items of pump head, shaft seals and driving assembly respectively.
Type TZR pumps are double volutes too. Its casing and cover is fitted with the inter changeable rubber liner (included impeller ,front& back liner).Pump casing and cover can be exchanged with that of type TZS, TZL & TZM pumps Its driving and installation is correspondance to type TZS, TZL & TZM pumps.
Type TZG and TZGH pumps are the construction of single volute(without liner).Pump body cover and impeller is made of resistance --abrasion alloy. Pump body and cover is connected by the special clamping construction. For the easy assembly and disassembly, the discharge branch may be rotated in any direction.
Inlet for all types pump is on the horizontal direction and pump should rotates clockwise in view of driving direction.
For the single stage pump and first stage pump of multi--stage series the expeller type shaft sealing assembly is normally fitted when the positive pressure of inlet is larger 10% than that of outlet.
Expeller type sealing assembly has the advantages of not requiring flushing water, not diluting pulp, good sealing result and so on.
2.2.2 Gland Packing Seal
The gland packing seal is single and easy maintenance ,but must require the flushing water service .For the duties where are not suitable for expeller seal the packed gland should be used.
2.2.3 Mechanical Sealing
Generally, the slurry pump use two types mechanical seal structures: (1) MH type:flushing water into pump cavity and pressure is more 0.1 Mpa than the pump outlet pressure. (2) MG type: the cooling water not flow into pump cavity and pressure is less than 0.1Mpa.
Seal water capacity is about 0.5l/s-1.1l/s. Before start, first open enough cooling water circulation for 5 minutes, every time after stop the pump, 5 minutes later, then stop the flushing water.
Since slurry pump application system is very complex, and there are a variety of mechanical seal structures. In order to make narrative aspect of mechanical seal more targeted, other typos mechanical seal structures instruction,please see the mechanical seal instruction.
All types of slurry pump may be adopted with the same series of driving assembly, included frames and bearing assemblies. A extremely rigid shaft of larger diameter with short overhang to impeller eliminates deflection and vibration under all condition of use. Large, wide, heavy duty, grease lubricated single or double rows taper roller bearings and roller bearings are fitted based on the transmitting power. The bearings are more than ample to carry all radial and thrust loads at maximum pump duty and have an unusually long life factor, Spigotted end covers close the housing and carry labyrinth sleeve and ring (bearing seal) to prevent slurry and dirty entering in bearings.
It is advisable to preheat bearing inner ring or cones (never exceed 120ºC). With shaft in vertical position heated inner ring or cones can be slipped on and pressed or tapped up to shoulder or grease retainer. For the double rows of taper roller bearings, It's inner ring or cones, cup and spacer may be not interchanged with the similar assembles of same type bearings.
For type --PA , PB , PC , PD , PE bearing assemblies , the single row taper roller bearing should be adopted. During assembly, axial gap in the end cover should be adjusted by means of shims, The value of axial gap should be corresponding with the following table.
For type--PR, PS, PST, PT, PTU, PV bearing assembly ,double rows taper roller bearings are fitted on the pump end. The axial gap may be not required to adjust because the end pay may be guaranteed by themselves. Apply oil or light grease to bearing lands. The seal in the end cover of bearing is used of labyrinth and pistion ring. Fit rings to groove of labyrinths.Position ring gaps diametrically opposite.
It is recommended that lubricating grease used in roller bearings should be NO. 2 or 3 ,SY1412--75 Lithium --Based Grease.
The recommended initial quantity of grease to be used for each bearing is as following table during assembly.
Gland assembly should be consisted of stuffing box, shaft sleeve, shaft spacer, shaft sleeve O--ring, neck and lantern rings, packing gland an cover. Two types of lantern ring can be in Fig .7 and 8. For the application of suction head the installation form shown in Fig.7 can be selected and the installation form shown in Fig. 6 for the application of positive suction head. The O--ring between shaft sleeve and spacer must be positioned correctly.
Packing Selection : Asbestos packing with mica should be often selected when the working pressure of pump is lower than 1 MPa
When the pressure is higher than 1 MPa or pumping corrosive slurry ,asbestos packing with polyterafluoroethlene should be used.
Note: All the sealing rings must be positioned correctly.
3.5 For type--PR, PS, PST, PT, PTU and PU heavy-duty bearing assemblies with release collar, its three socket head cap screws firstly unscrew, then screw them into three other thread holes, in this way protrude three pieces of collar, then loosen the impeller during disassembly.
4.1.1 Efficient service of pump can be obtained only by installing the pump on adequate foundations which should be designed to take all loads from the pump and motor and to absorb any vibration. All hold--down bolts should be fully tightened.
4.1.2 Pipelines and valves should be supported independently of the pump. Appropriate joint rings must be used at the pump flanges. In some pumps, the metal liner projects a short distance past the flange. Care should be taken in such instance not to over tighten the flange bolts so as to not to damage the joint rings.
4.1.5 For direct coupled, the pump and motor shaft should be accurately aligned. In Vee--belt driven, the pump shaft must be parrelled with the motor shaft. The position of pulley should be adjusted in order to make it perpendicular to belt and to prevent them from excessive wear and vibration. The adjustment of pulley should be met the requirements of a1=a2 in Fig. 13, when SPA and SPB is matched with SPA /SPB and SPB /SPC respectively.
4.1.6 A removable piece of pipe should be used on the intake side of the pump/ The pipe should be of sufficient length to allow removable of pump cover plate and to enable access to pump wearing parts. Its length should be seen in Outline Diagram of each pumps.
For gland sealed pump, check gland water available and that it is of sufficient quantity and at the correct pressure. Screw gland nuts to adjust the tighteness of packing rings and quantity of cooling liquid. Always maintain a small amount of clean water leakage along the shaft by regular adjusting the gland. If packing rings are too tight, the shaft sleeve shows signs of heating and sacrifice power. If the packing rings are too loose, the leakage would be excessive. It is normal for the pressure of sealing liquid to be 3.5x10-2 MPa (0.35kgf/cm2) higher than that of pump outlet. It is recommended that the quantity of sealing liquid should be supplied by following table.
f---- Total pressed amount in suspended distance.
C1---- Angle coefficient ( 0.9 about ).
C2---- Working coefficient ( 1.4 about ).
L'---- Centerline distance of pulleys.
P---- Motor rated power ( kw ).
Z---- Piece number of Vee--belt.
V---- Line velocity ( m/s ).
m---- Centrifugal force coefficient ( sen in Table 1 ).
e ---- Pressed amount e ( mm ) in 100mm length of suspended distance ( seen in Fig. 12 )
Table 1.
Note: R value in the Table 1 is in the unit of Newton.
Series number 1&2 should be the pulley of pump and motor in Fig. 13.
As Vee-belt is been adjusted to final pretension the maximum load will be on Vee-belt. It is best that pretension will be minimum. After adjustment, recheck the normal rotation of impeller, If any possible, start the pump by clean water before pumping slurry, Open valve in suction pipe to check the pressure and flow rate of outlet. Check the leakage from the gland. If leakage is insufficient and gland shows of heating, then try loosening gland nuts to make the leakage a little much. The leakage should be adjusted to a given value until shaft is engaged with the packing.
4.2.2 Check bearing assembly at regular intervals for operation condition. If the bearing shows heating at beginning the pump should be stopped. Then restart the pump. If the bearing continues to heat up and temperature is going up, the bearing assembly should be opened to check. In general, bearing heating is caused by over -- quantity of grease and impurities in the grease, The lubricant of bearing should be in given quantity and clean. The lubricant should be added periodically.
4.2.3 Pump performance and efficiency will lower down as the increase of clearance between impeller and frame plate liner. Therefore, impeller should be adjusted forwardly in time in order to keep the certain clearance and to maintain pump operating in higher efficiency.
Wearing parts should be replaced when the performance of a given pump no linger satisfies the requirements of a particular installation. It is recommended that the pump be opened at regular intervals and the remaining life of wearing parts may be established.
In centrifugally sealed pump lubricate the packings and lip ring regularly by means of the grease cup.
Rotate shaft clockwise by hand and move bearing assembly forwards by tightening rear nut until the impeller starts to rub on front liner. For metal lined pumps, release the nut just tightened by half a turn, then move bearing assembly back by means of front nut untill bousing lug touches rear nut and the clearance will be in 0.5----1mm. For rubber lined pumps, release fully rear nut, rotate shaft clockwise by hand and moe bearing assembly back by means of front nut untll impeller starts to the back of the end cover. Calculate the average distance and adjust the bearing assembly forward to this distance to be sure of the correct clearance between impeller and front and back liner. After adjustment, check the impeller rotation again and tighten clamp bolts and both adjust screw nuts before starting mp the pump. Then start up the pump.
5.4 Spare pumps should be turned in a quarter of turn so that the bearings may support static load and vibrition from outside evenly.
Lubrication Interval Table (Unit: hours )
Note: Above -- mentioned is only suitable for the normal operating condition and intended to be a guideline.
Above -- mentioned lubricants are used for bearing. For the bearing assemblies plugs inside bearing assembly are used for adding lubricant into the bearings and grease cup outside for cleaning labyrinths.
6. Possible Faults and Removal
1.1 Type ----TZS, TZM, TZHS pumps are also called as heavy--duty pumps. They can be operated in multistage series installation within the maximum working pressure of various types of pump have fitted with thicker wear--parts and large--duty frame, suitably transporting highly abrasive high density slurry or lower density high head slurry. Above types of pumps also can be used in a certain corrosive slurries.
1.2 Type TZL pump can be also called as light--duty slurry pump. Compared with heavy duty slurry pump, this type of pump is high speed, smallest, light--weight and suitable for transporting fine particle lower density slurry ( the maximum concentration in weight does not exceed 30% ).
It can be used for transporting high density lower abrasive slurry too.
1.3 Type TZG gravel pump and type TZGH gravel pump is designed for high density and lower abrasive slurry, which are suitable for delivering gravel, mud and slurry contained larger solids not for corrosive slurry.
1.4 The wet parts of TZR pumps should be elastomer. Its casing,cover and driving can be exchanged with TZS, TZL types of pump for the fine particle and corrosive slurry.
Type notation:
TZ - -
Frame Form
Seal Form
Pump Type
Pump Series
Outlet Diameter ( inch )
For Example
100TZ R G PE
PE Type Frame Form
Gland Seal
Pump Type Rubber
TZ Series Slurry Pump Type
Outlet Diameter (Inch)
2. Construction Introduction
The construction diagram of type -----TZS, TZHS, TZM pumps see in Fig.1.The construction diagram of type TZR pumps see in Fig.2.
The construction diagram of type TZL pump sees in Fig.3.
The construction diagram of type TZG./TZGH pump sees in Fig.4.
The construction for all types of horizontal slurry pump is similar, except for the pump head (included pump body, cover, impeller and etc...).All of them adopt the same series of driving. Its construction will be described according to the following items of pump head, shaft seals and driving assembly respectively.
2.1 Pump Head
Type ----TZS, TZL, TZM, TZHS pumps are designed with double volute that pump body and cover has been fitted with metal or rubber liner (included impeller ,liner insert, insert plate ),but not rubber liner for type ---- TZHS pumps. A cast iron or S.G. iron of pump body and cover depending on the working pressure ,casing split on the vertical centreline serves to support and be connected by means of bolts. Pump body is bolted and spigotted to the frame and the discharge branch may occupy any one of eight positions. Side sealing vanes on both sides of shoulders may relieve the leakage and raise the life and efficiency of pump.Type TZR pumps are double volutes too. Its casing and cover is fitted with the inter changeable rubber liner (included impeller ,front& back liner).Pump casing and cover can be exchanged with that of type TZS, TZL & TZM pumps Its driving and installation is correspondance to type TZS, TZL & TZM pumps.
Type TZG and TZGH pumps are the construction of single volute(without liner).Pump body cover and impeller is made of resistance --abrasion alloy. Pump body and cover is connected by the special clamping construction. For the easy assembly and disassembly, the discharge branch may be rotated in any direction.
Inlet for all types pump is on the horizontal direction and pump should rotates clockwise in view of driving direction.
2.2 Shaft Sealing Assembly
Three kinds of shaft seal----expeller type shaft sealing (E) and gland pacing assembly (G) and Mechanical sealing (M).2.2.1 Expeller Type Shaft Sealing Assembly
For the single stage pump and first stage pump of multi--stage series the expeller type shaft sealing assembly is normally fitted when the positive pressure of inlet is larger 10% than that of outlet.
Expeller type sealing assembly has the advantages of not requiring flushing water, not diluting pulp, good sealing result and so on.
2.2.2 Gland Packing Seal
The gland packing seal is single and easy maintenance ,but must require the flushing water service .For the duties where are not suitable for expeller seal the packed gland should be used.
2.2.3 Mechanical Sealing
Generally, the slurry pump use two types mechanical seal structures: (1) MH type:flushing water into pump cavity and pressure is more 0.1 Mpa than the pump outlet pressure. (2) MG type: the cooling water not flow into pump cavity and pressure is less than 0.1Mpa.
Seal water capacity is about 0.5l/s-1.1l/s. Before start, first open enough cooling water circulation for 5 minutes, every time after stop the pump, 5 minutes later, then stop the flushing water.
Since slurry pump application system is very complex, and there are a variety of mechanical seal structures. In order to make narrative aspect of mechanical seal more targeted, other typos mechanical seal structures instruction,please see the mechanical seal instruction.
2.3 Driving Assembly
All types of slurry pump may be adopted with the same series of driving assembly, included frames and bearing assemblies. A extremely rigid shaft of larger diameter with short overhang to impeller eliminates deflection and vibration under all condition of use. Large, wide, heavy duty, grease lubricated single or double rows taper roller bearings and roller bearings are fitted based on the transmitting power. The bearings are more than ample to carry all radial and thrust loads at maximum pump duty and have an unusually long life factor, Spigotted end covers close the housing and carry labyrinth sleeve and ring (bearing seal) to prevent slurry and dirty entering in bearings.
3. General Notes Regarding Assembly
3.1 Bearing Assembly (see in Fig 5&6)
It is advisable to preheat bearing inner ring or cones (never exceed 120ºC). With shaft in vertical position heated inner ring or cones can be slipped on and pressed or tapped up to shoulder or grease retainer. For the double rows of taper roller bearings, It's inner ring or cones, cup and spacer may be not interchanged with the similar assembles of same type bearings.
For type --PA , PB , PC , PD , PE bearing assemblies , the single row taper roller bearing should be adopted. During assembly, axial gap in the end cover should be adjusted by means of shims, The value of axial gap should be corresponding with the following table.
| Frame | PA | PB | PC | PD | PE | PF/PG |
| End Play(mm) | 0.05-0.15 | 0.1-0.2 | 0.15-0.25 | 0.18-0.28 | 0.4-0.6 | 0.5-0.6 |
For type--PR, PS, PST, PT, PTU, PV bearing assembly ,double rows taper roller bearings are fitted on the pump end. The axial gap may be not required to adjust because the end pay may be guaranteed by themselves. Apply oil or light grease to bearing lands. The seal in the end cover of bearing is used of labyrinth and pistion ring. Fit rings to groove of labyrinths.Position ring gaps diametrically opposite.
It is recommended that lubricating grease used in roller bearings should be NO. 2 or 3 ,SY1412--75 Lithium --Based Grease.
The recommended initial quantity of grease to be used for each bearing is as following table during assembly.
| Frame Grams | PB | PC | PD | PE | PF | PG | PR. PRS | PS. PST | PT. PTU |
| Drive End | 30 | 50 | 100 | 200 | 500 | 1150 | 200 | 500 | 1150 |
| Wet End | 30 | 50 | 100 | 200 | 500 | 1150 | 400 | 1000 | 2300 |
3.2 Gland Assembly
Gland assembly should be consisted of stuffing box, shaft sleeve, shaft spacer, shaft sleeve O--ring, neck and lantern rings, packing gland an cover. Two types of lantern ring can be in Fig .7 and 8. For the application of suction head the installation form shown in Fig.7 can be selected and the installation form shown in Fig. 6 for the application of positive suction head. The O--ring between shaft sleeve and spacer must be positioned correctly.
Packing Selection : Asbestos packing with mica should be often selected when the working pressure of pump is lower than 1 MPa
When the pressure is higher than 1 MPa or pumping corrosive slurry ,asbestos packing with polyterafluoroethlene should be used.
3.3 Centrifugal Seal Assembly ( see in Fig. 9 &10)
Centrifugal seal assembly is included with expeller ring, expeller, shaft sleeve spacer and so on. For the rubber expeller ring, the lip--sealing ring and cover should be used. Packing neck and lantern ring and packing gland should be used for the metal expeller ring. All shaft sealing assemblies are inter--changeable. Which one can be selected depands on the user's application.Note: All the sealing rings must be positioned correctly.
3.4 Pump Head Assembly
Fit the seal ring into frame plate groove.To hold frame plate liner insert temporarily in its correct position, move bearing assembly back by means of locating nut ( *303 ) and then fit the impeller and volute liner. Then , put the volute liner against frame plate. At last, fit cover plate insert and cover plate..For robber liner pump firstly fit the cover plate Iiner into the cover plate by means of tightening the sruds. Then, assembly cover plate with frame plate. During assemblying the rubber lubricant on the fitting surface. It is must sure that the seals must be positioned correctly in assembly. In order to guarantee the relative position of all fitting parts correct each other. The lifting tube ( * 302 ) and locating nut ( *303 ) for frame plate and frame plate liner, volute lifting beam( *304 ) and so on tools can be used ( see in Fig. 11)3.5 For type--PR, PS, PST, PT, PTU and PU heavy-duty bearing assemblies with release collar, its three socket head cap screws firstly unscrew, then screw them into three other thread holes, in this way protrude three pieces of collar, then loosen the impeller during disassembly.
4. Operation
4.1. Starting
Before starting the following steps must be taken.4.1.1 Efficient service of pump can be obtained only by installing the pump on adequate foundations which should be designed to take all loads from the pump and motor and to absorb any vibration. All hold--down bolts should be fully tightened.
4.1.2 Pipelines and valves should be supported independently of the pump. Appropriate joint rings must be used at the pump flanges. In some pumps, the metal liner projects a short distance past the flange. Care should be taken in such instance not to over tighten the flange bolts so as to not to damage the joint rings.
4.1.3 Before use of pump, the shaft should then be rotated by hand (clockwise) to insure than the impeller turns freely within the pump. At any sign of scraping noises from the pump, the impeller clearance must be adjusted.
4.1.4 Starting motor, check rotation and correct it if necessary produce pump shaft rotation indicated by arrow on the pump casing. THIS IS IMPORTANT. Rotation in direction opposite to the arrow on the pump will unscrew he impeller from the shaft causing serious damage to the pump.4.1.5 For direct coupled, the pump and motor shaft should be accurately aligned. In Vee--belt driven, the pump shaft must be parrelled with the motor shaft. The position of pulley should be adjusted in order to make it perpendicular to belt and to prevent them from excessive wear and vibration. The adjustment of pulley should be met the requirements of a1=a2 in Fig. 13, when SPA and SPB is matched with SPA /SPB and SPB /SPC respectively.
4.1.6 A removable piece of pipe should be used on the intake side of the pump/ The pipe should be of sufficient length to allow removable of pump cover plate and to enable access to pump wearing parts. Its length should be seen in Outline Diagram of each pumps.
4.1.7 Shaft Seal Check
For centrifugally sealed pumps fitting grease cup in the expeller ring, screw the grease due to different sealing construction at stopping. It is recommended that sodium calcium -- based soap grease should be used (SYB 1403--62).For gland sealed pump, check gland water available and that it is of sufficient quantity and at the correct pressure. Screw gland nuts to adjust the tighteness of packing rings and quantity of cooling liquid. Always maintain a small amount of clean water leakage along the shaft by regular adjusting the gland. If packing rings are too tight, the shaft sleeve shows signs of heating and sacrifice power. If the packing rings are too loose, the leakage would be excessive. It is normal for the pressure of sealing liquid to be 3.5x10-2 MPa (0.35kgf/cm2) higher than that of pump outlet. It is recommended that the quantity of sealing liquid should be supplied by following table.
Frame | PA | PB | PC | PD | PE. PF | PR. PRS | PG PS. PST | PT .PTu | PU |
| Quantity L/s | 0.15 | 0.25 | 0.35 | 0.45 | 0.70 | 0.70 | 1.2 | 1.6 | 2.1 |
4.1.8 Pretension Adjustment of Vee--Belt.
We only introduce our recommendation adjustment method as follows for reference.- Firstly calculate pretension Q.
- e value can be looked up from the curve based on pretension and Vee-belt type.
- Through formular f=e*L'/100
- R value related with the type of Vee-belt can be looked up in Fig. 12. According to the method in Fig. 12 and the centrerline distance adjusting between two pulleys, the required pretension will be reached.
f---- Total pressed amount in suspended distance.
C1---- Angle coefficient ( 0.9 about ).
C2---- Working coefficient ( 1.4 about ).
L'---- Centerline distance of pulleys.
P---- Motor rated power ( kw ).
Z---- Piece number of Vee--belt.
V---- Line velocity ( m/s ).
m---- Centrifugal force coefficient ( sen in Table 1 ).
e ---- Pressed amount e ( mm ) in 100mm length of suspended distance ( seen in Fig. 12 )
Table 1.
| Type | SPA | SPB | SPC | SPZ |
| R | 60 | 90 | 120 | 30 |
| m | 0.12 | 0.20 | 0.38 | 0.08 |
Note: R value in the Table 1 is in the unit of Newton.
Series number 1&2 should be the pulley of pump and motor in Fig. 13.
As Vee-belt is been adjusted to final pretension the maximum load will be on Vee-belt. It is best that pretension will be minimum. After adjustment, recheck the normal rotation of impeller, If any possible, start the pump by clean water before pumping slurry, Open valve in suction pipe to check the pressure and flow rate of outlet. Check the leakage from the gland. If leakage is insufficient and gland shows of heating, then try loosening gland nuts to make the leakage a little much. The leakage should be adjusted to a given value until shaft is engaged with the packing.
4.2 Operation
4.2.1 Periodically check pressure and quantity of sealing water and adjust packing gland in time or replace packing rings to maintain a small amount of clean water leakage along the shaft.4.2.2 Check bearing assembly at regular intervals for operation condition. If the bearing shows heating at beginning the pump should be stopped. Then restart the pump. If the bearing continues to heat up and temperature is going up, the bearing assembly should be opened to check. In general, bearing heating is caused by over -- quantity of grease and impurities in the grease, The lubricant of bearing should be in given quantity and clean. The lubricant should be added periodically.
4.2.3 Pump performance and efficiency will lower down as the increase of clearance between impeller and frame plate liner. Therefore, impeller should be adjusted forwardly in time in order to keep the certain clearance and to maintain pump operating in higher efficiency.
Wearing parts should be replaced when the performance of a given pump no linger satisfies the requirements of a particular installation. It is recommended that the pump be opened at regular intervals and the remaining life of wearing parts may be established.
4.3 Shutting Down
Whenever possible, the pump should be allowed to operate on water only for a short period to clear any slurry through the system before shut down. Then, shut down the pump, valves and gland sealing water.5. Maintenance
For long trouble -- free service with a minimum amount of maintenance it must pay much attention to following items.5.1 Shaft Seal Care
In gland sealed pump periodically check gland seal water supply and pressure. Always maintain small amount of clean water leakage along the shaft by regularly adjusting the gland. When gland adjustment is no longer possible replace full packing. Quantity and Pressure of sealing water should be correspondance with the abovementioned requirements.In centrifugally sealed pump lubricate the packings and lip ring regularly by means of the grease cup.
5.2 Impeller Adjustment
Pump performance changes inversly with the clearance existing between an impeller and the intake -- side liner. For the pump high efficiency operation the clearance between the impeller and liner must be adjusted. In metal pump the clearance between an impeller and the frame plate liner should be in 0.5----1mm. In rubber liner pump the clearance between an impeller and front & back liner should be equal. Firstly stop the pump when adjusting the clearance.Rotate shaft clockwise by hand and move bearing assembly forwards by tightening rear nut until the impeller starts to rub on front liner. For metal lined pumps, release the nut just tightened by half a turn, then move bearing assembly back by means of front nut untill bousing lug touches rear nut and the clearance will be in 0.5----1mm. For rubber lined pumps, release fully rear nut, rotate shaft clockwise by hand and moe bearing assembly back by means of front nut untll impeller starts to the back of the end cover. Calculate the average distance and adjust the bearing assembly forward to this distance to be sure of the correct clearance between impeller and front and back liner. After adjustment, check the impeller rotation again and tighten clamp bolts and both adjust screw nuts before starting mp the pump. Then start up the pump.
5.3 Bearing Lubrication
A correctly assembled and pre--greased bearing assembly as well as adequate maintenance will have a long trouble -- free life. Maintenance personal should open the bearing housings at regular intervals ( not longer than twelve months ) to inspect bearings and grease. The frequency and amount of lubricant to be added periodically depends upon a number of factors and a combination of them, including speed and size of bearing, duration and extent on -- off operation, and the usual environmental condition such as ambient and operating temperature and so on. Bearing heating will be caused by over -- lubricating. Therefore, judgement and experience should be the final determinging actors in establishing routine lubrication procedures. Following table can be referred to lubricate adequatly.5.4 Spare pumps should be turned in a quarter of turn so that the bearings may support static load and vibrition from outside evenly.
Lubrication Interval Table (Unit: hours )
| Frame | Add/ BRG (gram) | Bearing Speed (r/min) | |||||||||
| 200 | 300 | 400 | 600 | 800 | 1000 | 1200 | 1800 | 2000 | |||
| PB | 12 | 3000 | 2400 | 1800 | 1500 | 100 | |||||
| PC | 18 | 3600 | 2400 | 1800 | 1600 | 1200 | 900 | ||||
| PD | 28 | 2500 | 2000 | 1500 | 1200 | 800 | 500 | ||||
| PE | 44 | 5000 | 3600 | 2200 | 1600 | 1100 | 800 | 500 | |||
| PF | 71 | 7000 | 4200 | 2000 | 1800 | 1200 | 700 | 400 | |||
| PG | 137 | 5000 | 3600 | 2400 | 1200 | 600 | 200 | ||||
| Pump End | PR. PRS | 102 | 3000 | 2000 | 1400 | 1000 | 600 | 400 | 100 | ||
| PS. PST | 132 | 3800 | 2800 | 1500 | 900 | 500 | 300 | ||||
| PT. PTU | 304 | 4800 | 3000 | 1800 | 900 | 400 | |||||
| PU | 621 | 4000 | 2400 | 1500 | 500 | ||||||
| Driving End | PR. PRS | 61 | 8000 | 4800 | 3500 | 2800 | 2200 | 1500 | 900 | ||
| PS. PST | 74 | 8000 | 6000 | 3600 | 2400 | 1600 | 1200 | ||||
| PT. PTU | 133 | 8000 | 7000 | 4500 | 2500 | 1500 | |||||
| PU | 192 | 7000 | 6000 | 4000 | 2000 | ||||||
Above -- mentioned lubricants are used for bearing. For the bearing assemblies plugs inside bearing assembly are used for adding lubricant into the bearings and grease cup outside for cleaning labyrinths.
6. Possible Faults and Removal
| Faults | Reason | Removal |
| Pump fails to Suction any liquid | Air leaking into suction or gland, | Sealed leakage. |
| Incorrect direction of pump rotation & impeller worn. | Check direction of rotation and replacing impeller | |
| Suction pipe blocked. | Removal blockage. | |
| Shaft power consumption is excessive | Gland excessively tightened against packing rings. | Loosen gland bolts. |
| Rotating component rubbing on a stationary part. | Removal the rubbed part. | |
| Bearing worn | Replace the bearing | |
| Drive belt tension too tight. | Adjusting belt | |
| Flow rate too large. | Modifying the pump duty and speed. | |
| Pump speed&ratio too high. | Adjusting drive&pump shaft. | |
| Misalignment or unparallel of drive shaft and pump shaft. | Adjusting drive&pump shaft. | |
| Bearing is over heating | Lubricants too much or less. | Lubricating as requirements. |
| Containing impurities in the lubricant. | Replace new lubricant. | |
| Bearing worn. | Replace new bearing. | |
| Bearing has short life. | Misalignment or unparallel of drive and pump shaft. | Adjusting drive and pump shaft. |
| Shaft bent. | Replacing shaft. | |
| Impeller unbalanced or rubbing. | Replacing new impeller or remove rubbing | |
| Foreign object entered into the bearing or insufficient lubrication. | Clean the bearing. | |
| Incorrect procedure followed in fitting bearings. | Replacing or refitting the bearings. | |
| Excessive leakage from stuffing box | Packing rings excessive worn. | Replacing new packing rings. |
| Shaft sleeve worn. | Replace shaft sleeve. | |
| Dirty sealing water | Change clean sealing water. | |
| Pump vibrates or noisy. | Bearing worn. | Replace by new bearings. |
| Impeller unbalanced. | Replace by new impeller. | |
| Air entered into suction pipe or blocked. | Discharge air and remove block. | |
| Flow rate non-uniform and pump not primed. | Improve on the pump feeding. |
