DESIGN OF A BUILDING FIRE PUMP SYSTEM WITH INTEGRATED PARALLEL PUMP

Multi-storey building must be equipped with a reliable building fire extinguishing system. The existing fire extinguishing system design is not equipped with a backup pump and a jockey pump. Based on The DKI Jakarta Governor Regulation No. 92/2014 and the Indonesian National Standard, to solve this problem, a building fire pump system is designed with a combination of the jockey pump, main pump and backup pump that connected in an integrated parallel arrangement. This design allows the backup pump to automatically run due to a pressure drop in the system pipe if the main pump fails or unable to build up pressure. When a fire occurs and a lot of hydrants are used, the backup pump will automatically run to help the main pump with a signal triggered by the pressure switch.


INTRODUCTION
Multi-storey building must be equipped with a fire extinguishing system. The building fire system must comply with applicable standards. The DKI Jakarta Governor Regulation No. 92/2014 is one of the standards related to the building fire pump system applicable in the DKI Jakarta area. Based on fire extinguishing standards, the main part of a building fire extinguisher is the pumping system in the pump room consisting of the main pump, backup pump, and runway pump.
The current fire extinguishing pump system design discussed in several previous journals has a weakness in the absence of a backup pump or it is equipped with a backup pump but is not integrated with the main pump. There is a risk of danger if the main pump fails to operate in a fire emergency. This paper discusses the solution of the existing problems by designing a building fire system using a main pump and a backup pump that are connected in parallel with an integrated running scenario in accordance with the DKI Jakarta Governor Regulation No. 92/2014 concerning Technical Requirements and Procedures for Installation of Pipe and Fire Hose Systems and Yard Hydrants and the Indonesian National Standard No. 03-1745-2000 concerning Procedures for Planning and Installation of Upright and Slang Pipe Systems for Prevention of Fire Hazards in Houses and Buildings .
The backup pump is designed to run automatically with a drop in system pressure detected by the pressure switch if the main pump fails. The backup pump is not only used when the main pump is in trouble or is in the maintenance process. However, when a fire occurs and many hydrant valves are opened, resulting in the main pump being unable to build up pressure, the backup pump will automatically run and help the main pump deliver water to the hydrant.

AIM OF RESEARCH
To produce a building fire pump system design with an integrated parallel pump series in accordance with the DKI Jakarta Governor Regulation No. 92/2014 and Indonesian National Standard No. 03-1745-2000.     = 0,2

FINDING THE INNER SURFACE AREA ON PIPE (A)
. d 2    [10] To solve the above equation, the iteration method was calculated using Microsoft Excel® software to obtain the convergent darcy coefficient (λ) for each pipe. Based on the results of the iteration calculations above, the convergent Darcy coefficient values can be obtained as follows:

CALCULATE HEAD LOSS ON ELBOW ∅ 100 [MM]
On the suction line there is 1 pcs elbow ∅ 100 [mm] schedule 40 long radius, so the losses can be calculated as much as:

CALCULATE HEAD LOSS ON CHECK VALVE ∅ 150 [MM]
In the inlet there is 1 pcs check valve ∅ 150 [mm] as required in the DKI Jakarta Governor Regulation No.

CALCULATE HEAD LOSS ON GLOBE VALVE ∅ 150 [MM]
In the inlet there is 1 pcs globe valve ∅ 150 [mm] and the losses can be calculated as:

CALCULATE TOTAL HEAD LOSS ON DISCHARGE PIPELINE
The total head loss in the main pump discharge line can be obtained by adding up all the head losses in the main pump discharge pipeline. hr total = hr pipe ∅65 + hr pipe ∅100 + hr pipe ∅150 + hr reducer + hr elbow + hr check valve + hr globe valve + hr gate valve Based on the results of the above calculations, the total head loss can be obtained as follows:

CALCULATE THE MINIMUM WATER LEVEL IN THE RESERVOIR
Net Positive Suction Head Available needs to be taken into account to keep fire pumps from the risk of cavitation. NPSHa is minimum so that the pump does not experience cavitation if NPSHa = NPSHr, so that the minimum water level in the tank to the pump centerline can be calculated as follows: So that the pump does not experience cavitation, the water level in the tank must not be more than 5.82 [m] below the pump centerline. 92/2014 and the Indonesian National Standard (SNI) with an integrated parallel pump. The backup pump not only functions as a substitute when the main pump fails or has a problem, but when a fire occurs and many hydrants are opened, the backup pump will also automatically run with a significant pressure drop in the damkar system. The main pump and the backup pump will run automatically when a pressure drop is triggered by the pressure switch. • The minimum water level in the tank to prevent cavitation from the pump should not be lower than 5,82 [m] below the pump centerline. • The minimum capacity of the building firefighting water source tank is 171 [m 3 ].

RECOMMENDATION
1) The design or modification of the building's fire pump needs to ensure the availability of the components and materials needed and on the market. 2) The design or modification of the building's fire pump needs to pay attention to the ease of the maintenance process for each of its main components.

SOURCES OF FUNDING
This research received no specific grant from any funding agency in the public, commercial, or not-for-profit sectors.

CONFLICT OF INTEREST
The author have declared that no competing interests exist.