Description
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.
- Medium temperature: normal type:0℃ ~68℃ hot water type:0℃ ~120℃，
- Ambient temperature:+40℃ ,
- Max ambient pressure:1.0MPa,
- Advisable to use motor of higher power in case that the density or viscosity of medium is above that of water.
- PH: 5 to 8
| 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 | ● | ● |
Energy Efficiency Standard (IEC60034)
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
1. Duty point of the pump:
From a duty point it is possible to select a pump on the basis of the curve charts shown in “performance curves/technical” data.
2. Dimensional data:
When sizing a pump the following must be taken into accounting: •Required flow and pressure at the draw-off point. •Pressure loss as a result of height differences. •Friction loss in the pipework(Hf) (Refer to Fig.1) It may. •Best efficiency at the estimated duty point. •NPSH value. •For calculation of the NPSH value, see corresponding curves chart.
3. Pump efficiency:
Before determining the best efficiency point, the operation pattern of the pump needs to be identified. If the pump expected to operate as the same duty point, then select a BL pump which is operating at a duty point corresponding with the best efficiency of the pump.
As the pump is sized on the basis of the highest possible flow, it is important always to have the duty point to the right on the efficiency curve(eta) in order to keep efficiency high when the flow drops.
4. Pump material:
Selection of pump connection depend on the rated pressure and pipe work. the pump offer a wide range of ftexible connection such as:
5. Commonly used mechanical seal configuration tables
| 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.
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.
