1976-1977 — Page 254

Public Works Department Annual Report 工務司署年報 All AI Reviewed
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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

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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
Baseline (Original)
APFENDIX CC - Cont'd. (8) Routine Electrical Works 11 " 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 Steel 100 mm to 450 mm 8441 3 187 Cast Iron 100 mm to 450 mm Asbestos Cement 100 mm to 500 mm Galvanized Iron 80 mm to 150 mm 1 130 272 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
2026-05-12 09:57:36 · Baseline
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APFENDIX CC

-

Cont'd.

(8) Routine Electrical Works

11

"

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

Steel 100 mm to 450 mm

8441

3 187

Cast Iron 100 mm to 450 mm

Asbestos Cement 100 mm to 500 mm

Galvanized Iron 80 mm to 150 mm

1 130

272

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

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