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Fire pump system

 

.1Pump2. Motor

3. Controller

4. Suction connections5. Discharge connections

6. Test line

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PUMP TYPES

1-HORIZONTAL (AXIAL )

SPLIT CASE PUMP2- VERTICAL (RADIAL )

PUMPS

3-END SUCTION PUMP4-TURBINE PUMPS

We use centrifugal pumps

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HORIZONTAL SPLIT CASE

PUMP

* Single stage pump

* Multi stage pump

Advantages

•High flow rate

•Can used with electrical and diesel

motors

Disadvantages

•Hard maintenance

•High cost

•Takes a Big size

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VERTICAL PUMP

Vertical in-line is the most famous

 

Advantages

Effective

Good price

Disadvantages•Flow rate more than 1500 GPM

•Works on an electrical motor only

• Need a filter

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END SUCTION PUMP

Types

•

Flexible coupling pump•Long coupling pump

 

Advantages

•Works with electrical and diesel motors

•Easy installation

Disadvantages

Flow rare more than 150 GPM

 

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TURBINE PUMP

Advantages

•Works with electrical and diesel motors

•High flow rate

 

Disadvantages

•Hard installation and maintenance

•High price

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SYSTEM PUMP

We install on the main line 3 pumps

1-Electrical pump

Usually it is horizontal split case or end suction2-Electrical pump

Works when the power went off 

or when the main load more than electrical pump load

3- jockey pump

 it works to make up the friction losses

The flow 10 % from the total flow

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PUMP SELECTION

Requirements

1-it give the required flow rate and pressure .

2- it is preferred to be at the middle of the curve .

3-it give 150% of the flow rate at pressure higher than 65% of the real

 pressure.

4-the shut down pressure not more than 140% of the real pressure .

5-passed the UL&FM tests .6-NPSH not more than 20 Psi.

7- flow rate range from 25 to 5000 GPM.

 

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We can use Pump Affinity Laws to change the speed

*We use pumps with 2900 rpm

 

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INSTALLATION AND CONNECTING

PUMPS* INSTALL THE PUMPS CLOSE TO THE RISER TO

AVOID CAVITATIONS

*BEFORE THE PUMP WE INSTALL

  1-CHECK VALVE

2-GATE VALVE

  3-FLXIBLE CONNECTION

4-STRAINER 

  5-FLOW METER 

*WE PUT THE PUMP ON INSULATOR FROM RUBBER  

* TUBES LESS THAN 2’’ THREADED

MORE THAN THAN IS WELDED

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REQUIRED PUMP

PRESSUREPt= Pi + Pf + Ps

Pt: total pressure

Pi: system operating pressure

Pf: pressure friction losses

Ps: pressure losses due to elevation

According to NPFA

Not operating pressure doesn’t excess 120% therequired pressure and 140% for the end suctionpump

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PUMP SUMMARY