PERENCANAAN ULANG SISTEM INSTALASIAIR BERSIH KANTOR OTORITAS BANDAR UDARA WILAYAH III

Abstract

Redesign Water System Intallation Office of Airport Authority Region III. Old building and new building
Airport Authority Region III has a working installation of water and pumps of different systems. Old building
consists of three floors using press tank system (hydrosphere). Being new building consists of 7 floors using roof
tank systems. With consideration of cost efficiency of electricity consumption and maintenance costs burden, the
press tank system is considered less efficient because of the fluctuation of the working pressure greater than the tank
roof system. This resulted in the pumps often operate ON - OFF quickly also resulting in large power consumption
and potentially cause damage to pumps and installation. The purpose of this study was to plan the installation of the
system on integrated water on both the building using roof tank system. From the analysis of the water requirement
calculations required water availability of 120 m
3
/ day. For office buildings with average working hours of eight
hours are taken into account during peak usage hours by 27 m
3
/ h. Of the allowable flow rate, then the dimensions
of the transfer pipes and main pipes  3 inch, collection pipes and branch pipes varies the  ½, ¾, 1, 1¼ and 1½
inch. For ground water tank volume of 90 m
3
, roof tank was needed capacity of 67.5 m
3
(3 units @ 22,500 liter
tank). Take into account head losses that occur in the transfer pipe, acquired 34 m total head pumps, hydraulic
power with 78% efficiency of 3.21 kW. Of reference brands Grundfos pump then pumps Grundfos selected types of
vertical multistage centrifugal pump with specifications: Type CR (E) 32-2, capacity 32 m
3
/ h, head 34 m, 4 kW
motor power, supply voltage 3 x 380-480 Volt, 2900 rpm rotation and frequency of 50 Hz. Pumps installed two units
in parallel.

Keywords: the water demand, roof tank, pump, flow rate, reservoir.