APPENDIX CC
Cont'd.
(8) Routine Electrical Works
1975-76 1976-77 Items of work carried out in Workshops 1,249 1,092 Plant inspections and tests 9,000 9,600 Major plant overhauls 36 45 479 508 Random faults rectified(9) Trunk and Distribution Mains
The following fresh and salt water trunk and distribution mains were laid :-
Fresh Water (m) Salt Water (m) Steel 500 mm and over 3 187 Steel 100 mm to 450 mm 8441 Cast Iron 100 mm to 450 mm Asbestos Cement 100 mm to 500 mm 1 130 272 Galvanized Iron 80 mm to 150 mm 73 306 26 860 15 212 15 912 67 Galvanized Iron 20 mm to 50 mm 63 843 P.V.C. 50 mm to 150 mm 4330 7868(10) Routine Instrumentation Works
1975-76 1976-77 Inspections and tests 5,072 6,411 Random faults rectified 694 669(11) Chemical Treatment
Principal chemicals used in treatment :
1975-76 1976-77 Tonnes Average dose (mg/1) Tonnes Average dose (mg/1) Fresh Water Alum 3 871 10.3 3 889 9.5 Hydrated lime 3 997 10.7 4404 10.7 244