Volume 8 – Mechanical and Electrical Services - Malaysia Geoportal

Chapter 1 PUMPING INSTALLATION
Fig. 1.13 Crane General Arrangement
c) Stoplog
Stoplog grooves are provided ahead of the trash racks for purpose of maintenance and repair work.
Stainless steel side seal plates or mild steel guides are fixed to the grooves so that the stoplog
elements are properly guided into the slots.
Normally stoplog is made up of three (3) to five (5) pieces of mild steel panels to the required height
to block out the water from entering the approach channel. Decision of the number of elements is
governed by the admissible space available and the limitation of the lifting effort. Each panel shall
be limited to less than 2000 kg so that it can be easily handled with a light duty lifting device or
lorry-mounted crane. Side rollers are provided to facilitate easy insertion of the element. The stoplog
is normally designed for balanced condition, but main rollers may be required if unbalanced condition
prevails. Effective sealing is accomplished with the combination of seal seals and bottom seal to each
element. Design of the lifting device shall be capable of being self-engaged and released easily to
the lifting bracket of the stoplog element.
General arrangement, construction and dimensional requirement of the stoplog elements are as
shown in Fig. 1.14.
1-24 March 2009