1974-1975 — Page 226

# APPENDIX CC -

Contd.

(8) Routine Electrical Works

1973-74 1974-75 Items of work carried out in workshops 1,088 796 Plant inspections and tests 35,765 33,225 Major plant overhauls 24 37 Random faults rectified 377 321

(9) Trunk and Distribution Mains

The following fresh and salt water trunk and distribution mains were laid:

Fresh Water (ft.) Salt Water (ft.) Steel 22 in. dia. and over 8,743 51 Steel 4 in. to 18 in. dia. 3,227 1,021 Cast Iron 4 in. to 18 in. dia. 1,371 575 Asbestos Cement 4 in. to 21 in. dia. 61,458 38,059 Galvanized Iron 3 in. to 6 in. dia. 59,492 20 Galvanized Iron 1 in. to 2 in. dia. 64,226 P.V.C. 2 in. to 6 in. dia. 10,062 24,215

(10) Routine Instrumentation Works

1973-74 1974-75 Inspections and tests 35,766 29,601 Random faults rectified 618 509

(11) Chemical Treatment

Principal chemicals used in treatment:

1973-74 Long tons 1973-74 Average dose (parts per million) 1974-75 Long tons 1974-75 Average dose (parts per million) Fresh Water Alum 3,711 10.4 4,051 11.8 Hydrated lime 3,479 9.8 4,050 11.8 Liquid chlorine 456 1.3 469 1.4 Sodium silicofluoride 400 0.7 (as fluoride) 368 0.7 (as fluoride) Salt Water Liquid chlorine 110 1.8 107 1.7 215