The following is about Vertical Multi-Stage Centrifugal Pumps related Blt,I hope to help you better understand Vertical Multi-Stage Centrifugal Pumps.
BL(T) series stainless steel multi-stage centrifugal pump (afterwards called pump)boasts characters of high efficiency, low noise, steady operation, etc.The pump set adopts the non-self-priming vertical multi-stage structure, which makes a compact whole,its installation easy, its operation and maintenance convenient.
Water supply |
BL |
BLT |
Filtration and transfer at waterworks |
● |
● |
Distribution from waterworks |
● |
● |
Pressureboosting in mains |
● |
● |
Pressure boosting in high-rise buildins,hotels,etc. |
● |
● |
Pressure boosting for industrial water supply |
● |
● |
Industry |
|
|
Pressure boosting |
|
|
Process water systems |
● |
● |
Washing and cleaning systems |
● |
● |
Vehicle washing tunnels |
● |
● |
Fire fighting systems |
● |
● |
Liquid transfer |
|
|
Cooling and air-conditioning systems(refrigerants) |
● |
● |
Boiler feed and condensate systems |
● |
● |
Machine tools(cooling lubricants) |
● |
● |
Aquafarming |
● |
● |
Transfer |
|
|
Oil and alcohol |
● |
● |
Glycol and coolants |
● |
● |
Water treatment |
|
|
Ultra-filtration systems |
● |
○ |
Reverse osmosis systems |
● |
○ |
Softening, ionising, demineralizing systems |
● |
○ |
Distillation sys tems |
● |
○ |
Separators |
● |
○ |
Swimming baths |
● |
● |
lrrigation |
|
|
Field irrigation(flooding) |
● |
● |
Sprinkler irrigation |
● |
● |
Drip-feed irrigation |
● |
● |
Calculation Of minimum Inlet Pressure
If the pressure in pump is lower than the vapour pressure of medium, cavitation will occur, which will affect the performance of pump. To avoid the cavitation and ensure the pump inlet has a minimum pressure, maximum suction head should be calculated as following:
H=Pbx10.2-NPSH-Hf-hv-Hs
Pb: Atmospheric pressure, bar (In close pipeline system, it can be considered as the system pressure );
NPSH: Net positive suction head, m (Value at maximum flow of Q-NPSH curve);
Hf: Suction pipe line loss (Value at maximum flow of corresponding pipeline);
Hv: Medium vapour pressure, m (Medium vapour pressure at corresponding temperature, the default medium is water, as shown in figure4 on the right );
Hs: Safety margin, m, general value is 0.5.
Calculation result: if H is positive, the pump is installed in suction way, otherwise, it is installed in downdraft way.
Note: It is not necessary to do above calculation under general conditions. Only when we use pump in the following situations do we need to calculate the H:
1. Medium temperature is high;
2.The velocity of flow is larger than rated value;
3.Suction head is big or inlet pipeline is long;
4.System pressure is small;
5.Inlet condition is bad.
Selection Of Pumps
Selection of pumps should be based on:
Duty point of the pump.
Dimensional data such as pressure loss as aresult of height differences,friction loss in the pipework,
Pump efficiency etc.
Pump materials
Pump connections
Commonly used mechanical seal configuration tables
Selection of pump connection depend on the rated pressure and pipe work. the pump offer a wide range of ftexible connection such as:
Application Field | Shaft seal type | Shaft seal material | ||||||||||
Normal | Special | 1 | 2 | 3 |
4
5
|
Type key | ||||||
Rotating part | Code | Stationary part | Code | Elastomers | Code | Compression spring | Collor | Code | ||||
0℃ to +90℃ clean water | ● | Graphite | A | SiC | S | FPM | F | SUS304 | C | ASFC | ||
0℃ to +90℃ clean water | ● | WC | W | Graphite | A | FPM | F | SUS304 | C | WAFC | ||
+90℃ to +120℃ corrosion resistance | ● | SiC | S | SiC | S | EPDM | E | SUS304 | C | SSEC | ||
up to 0℃ | ● | WC | W | WC | W | EPDM | E | SUS304 | C | WWEC |
Mechanical seal type | Pump model | d1 | d2 | h |
NJK | BL(T)2/4 | 12 | 12 | 55 |
BL(T)8/12/16/20 | 16 | 16 | 57.5 | |
BL(T)32/45/60/90 | 22 | 22 | 72 | |
NDA | BW(J)2/4 | 12.7 | 16 | 32 |
BW(J)8/16 | 17.4 | 20 | 33.5 |
Model |
Curve No. |
BL(T)2,4 |
2 |
BL(T)8,12,16,20 |
3 |
BL(T)32-2-2~BL(T)32-7 |
1 |
BL(T)32-8-2~BL(T)32-12 |
4 |
BL(T)32-13~BL(T)32-15-2 |
5 |
BL(T)45-2-2~BL(T)45-6 |
1 |
BL(T)45-7-2~BL(T)45-9 |
4 |
BL(T)45-10-2~BL(T)45-13-2 |
5 |
BL(T)64-2-2~BL(T)64-5-2 |
1 |
BL(T)64-5-1~BL(T)64-8 |
4 |
BL(T)90-2-2~BL(T)90-4-2 |
1 |
BL(T)90-4~BL(T)90-6 |
4 |
BL(T)120,150 |
6 |
The limits of pressure and temperature are shown in the following fig.4,the pressure and temperature must be in the shown in the fig. 4.
When the pump is operating in the place where ambient temperature is higher than 40℃ or altitude is higher than 1000m,the output power of motor P2 will decrease because of poor cooling caused by low air density.Therefore, in that case,the pump should be equipped with high-power motor.
It is recommended to be used within lift range.
It is recommended to be used within lift range.
It is recommended to be used within lift range.
It is recommended to be used within lift range.
It is recommended to be used within lift range.
It is recommended to be used within lift range.
It is recommended to be used within lift range.
It is recommended to be used within lift range.
It is recommended to be used within lift range.
PN25-40/DN100 standard flange, on request.
It is recommended to be used within lift range.
PN25-40/DN100 standard flange, on request.
It is recommended to be used within lift range.
It is recommended to be used within lift range.