Volume 8 – Mechanical and Electrical Services - Malaysia Geoportal

Chapter 1 PUMPING INSTALLATION
General layout and dimensional requirement of the stationary screen is as shown in Fig. 1.12.
Information required: -
Channel width (W)
Channel depth (H)
Angle of inclination (θ)
Highest water level (HWL)
Lowest water level (LWL)
Clear spacing between bars (S)
b) Overhead Crane
Fig 1.12 Stationary Screen General Layout
Stationary crane of monorail type is more commonly used in small scale pumping installation where
lifting load is relatively light and usage is infrequent. Hand chain hoist and electric hoist equipped
with geared trolley lend itself to such application. Electric overhead traveling crane is well suited to
moderate size and large size pumping stations for the load to be handled. For outdoor application,
gantry crane may be suited for unusual site conditions and special application.
Design of the crane structure shall be based on the type of service required. Hoist unit shall be
seized to lift the heaviest individual component in the station. It shall be hung at sufficient height to
give ample space above the floor level to allow for the working depth of the hoist, and the crane
hook should be capable of reaching the machinery to be hoisted at its installed position.
Prior to the installation of the electric crane, compliance to the Jabatan Keselamatan & Kesihatan
Pekerjaan (JKKP) requirement is warranted such as application for registration (JKJ 105). Documents
such as (i) letter of confirmation from Consultant on crane runway structure (to be chopped and
signed by civil Professional Engineer), (ii) crane design calculation and (iii) crane test certificate from
Manufacturer. Electric overhead crane is subjected to load test to the regulations and requirements
of Jabatan Keselamatan & Kesihatan Pekerjaan (JKKP). The test will be witnessed and certified by
JKKP prior to the issuance of Certificate of fitness. JKKP. As stipulated in the Act, the hoisting
machinery is subjected to inspection at regular interval.
General layout and dimensional requirement of the crane is as shown in Fig. 1.13.
March 2009 1-23