Australian Capital Territory Current Regulations

SCAFFOLDING AND LIFTS REGULATION 1950 - SCHEDULE 7

Schedule 7    

Table 7.1     Decompression—stoppages after exceeding ordinary time limits

(see s 99 (21) to (23))

depth		pressure	time from leaving surface to beginning of ascent	stoppages at different depths in minutes								total time for ascent
ft	fathoms	lb/in 2		80ft	70ft	60ft	50ft	40ft	30ft	20ft	10ft	minutes

66	11	29	over 3h	...	...	...	...	...	...	10	30	42
72	12	32	2 to 3h over 3h	... ...	... ...	... ...	... ...	... ...	... ...	10 20	30 30	42 52
78	13	34 1 /2	1 1 /2to 2 1 /2h over 2 1 /2h	... ...	... ...	... ...	... ...	... ...	... ...	20 30	30 30	52 62
84	14	37	1 1 /4 to 1 1 /2h 1 1 /2 to 1 3 /4h 1 3 /4 to 2h 2 to 2 1 /2h 2 1 /4 to 2 1 /2h 2 1 /2 to 2 3 /4h 2 3 /4 to 3h over 3h	... ... ... ... ... ... ... ...	... ... ... ... ... ... ... ...	... ... ... ... ... ... ... ...	... ... ... ... ... ... ... ...	... ... ... ... ... ... ... ...	... ... ... ... 2 3 5 10	10 10 15 20 23 27 30 30	25 30 30 30 30 30 30 35	37 42 47 52 57 62 67 77
90	15	40	1h to 1h 12min 1h 12min to 1hr 20min 1h 20min to 1 1 /2h 1 1 /2h to 1h 44min 1h 44min to 2h 2h to 2h 14min 2h 14min to 2 1 /2h 2 1 /2h to 2h 44min 2h 44min to 3h 14min over 3h 14min	... ... ... ... ... ... ... ... ... ...	... ... ... ... ... ... ... ... ... ...	... ... ... ... ... ... ... ... ... ...	... ... ... ... ... ... ... ... ... ...	... ... ... ... ... ... ... ... ... ...	5 5 5 5 5 5 5 10 20 20	10 15 15 20 25 25 30 30 30 35	20 20 25 25 25 30 30 30 30 35	37 42 47 52 57 62 67 72 82 92

96	16	42 1 /2	55min to 1h 12min 1h 12min to 1 1 /2h 1 1 /2h to 1h 54mins 1h 54min to 2h 18min 2h 18min to 2 1 /2h 2 1 /2h to 2h 54min over 2h 54min	... ... ... ... ... ... ...	... ... ... ... ... ... ...	... ... ... ... ... ... ...	... ... ... ... ... ... ...	... ... ... ... ... ... ...	5 5 5 10 10 20 30	10 15 25 30 30 30 35	25 30 30 30 35 35 35	42 52 62 72 77 87 102
108	18	48	40 to 50min 50min to 1h 1h to 1h 18min 1h 18min to 1h 44min 1h 44min to 2h 2h to 2h 18min 2h 18min to 2h 34min 2h 34min to 2h 50min over 2h 50min	... ... ... ... ... ... ... ... ...	... ... ... ... ... ... ... ... ...	... ... ... ... ... ... ... ... ...	... ... ... ... ... ... ... ... ...	... ... ... ... 5 5 10 15 15	8 10 10 15 15 20 25 25 30	10 15 20 20 25 30 30 30 35	20 20 25 35 35 35 35 40 40	41 48 58 73 83 92 102 112 122
120	20	53 1 / 2	35 to 50min 50min to 1h 1h to 1h 22min 1h 22min to 1h 44min 1h 44min to 2h 2h to 2h 22min 2h 22min to 2h 44min over 2h 44min	... ... ... ... ... ... ... ...	... ... ... ... ... ... ... ...	... ... ... ... ... ... ... ...	... ... ... ... ... ... ... ...	... 5 5 5 10 15 20 30	10 10 15 20 20 25 30 35	15 15 25 30 30 35 35 35	20 25 25 30 35 35 40 40	47 57 72 87 97 112 127 142

132	22	59	30min to 38min 38min to 3 /4h 3 /4h to 1h 1 to 1 1 /4h 1 1 /4h to 1 1 /2h 1 1 /2h to 1 3 /4h 1 3 /4h to 2h 2 to 2 1 /4h over 2 1 /4h	... ... ... ... ... ... ... ... ...	... ... ... ... ... ... ... ... ...	... ... ... ... ... ... ... ... ...	... ... ... ... 5 5 10 15 15	... 5 5 10 10 15 20 25 30	5 10 15 20 20 20 25 30 35	15 15 20 25 30 35 35 35 40	20 20 25 25 30 35 35 35 40	43 53 68 83 98 113 128 143 163
144	24	64 1 / 2	25 to 32min 32min to 39min 39min to 3 /4h 3 /4h to 1h 1h to 1 1 /4h 1 1 /4h to 1 1 /2h 1 1 /2h to 1 3 /4h 1 3 /4h to 2h 2 to 2 1 /4h 2 1 /4 to 2 1 /2h over 2 1 /2h	... ... ... ... ... ... ... ... ... ... ...	... ... ... ... ... ... ... ... ... ... ...	... ... ... ... ... ... ... ... ... ... ...	... ... 3 5 5 10 15 20 20 25 30	3 5 5 5 10 10 15 20 25 25 30	7 9 10 15 20 20 20 25 30 35 35	12 14 15 20 25 30 35 35 35 40 40	18 22 25 30 30 35 35 35 40 40 40	43 53 61 78 93 108 123 138 153 168 178
156	26	70	20 to 24min 24 to 30min 30 to 35min 35 to 45min 45 to 55min 55 to 60min 1h to 1h 9min 1h 9min to 1h 18min 1h 18min to 1h 27min 1h 27min to 1h 37min 1h 37min to 1h 47min 1h 47min to 1h 56min over 1h 56min	... ... ... ... ... ... ... ... ... ... ... ... ...	... ... ... ... ... ... ... ... ... ... ... ... ...	... ... ... ... ... ... ... ... ... 5 10 15 20	2 2 3 5 5 7 10 10 15 15 20 20 25	4 4 5 6 8 10 10 15 15 20 20 30 30	8 10 10 12 15 15 20 25 30 30 35 35 35	9 12 15 20 25 30 30 35 35 40 40 40 40	12 17 20 25 30 30 35 35 40 40 40 40 40	38 48 56 71 86 95 108 123 138 153 168 183 193
168	28	75	16 to 23min 23 to 30min 30 to 40min 40 to 50min 50 to 60min 1h to 1 1 /4h 1 1 /4 to 1 1 /2h 1 1 /2h to 1h 40min 1h 40min to 1h 55min over 1h 55min	... ... ... ... ... ... ... ... ... ...	... ... ... ... ... ... ... 2 3 5	... ... ... ... 3 5 10 13 17 25	2 3 4 6 10 10 15 15 20 25	4 5 7 10 10 15 20 25 25 30	8 10 12 12 15 20 25 30 35 35	11 15 20 25 30 35 35 35 40 40	15 20 25 30 30 35 35 40 40 40	43 56 71 86 101 123 143 163 183 203
180*	30	80 1 /2	14 to 20min 20 to 30min 30 to 40min 40 to 50min 50 to 60min 1h to 1h 11min 1h 11min to 1h 23min 1h 23min to 1h 34min 1h 34min to 1h 46min over 1h 46min	... ... ... ... ... ... ... ... ... ...	... ... ... ... 3 3 3 8 8 15	... 2 2 2 3 5 5 10 20 25	2 2 3 6 7 10 15 20 25 30	3 3 6 8 10 15 20 25 30 30	7 10 14 15 20 25 30 30 30 35	10 15 20 25 35 35 35 35 35 40	15 25 30 35 35 35 40 40 40 40	41 60 77 94 111 131 151 171 191 218
192*	32	86	13 to 20min 20 to 30min 30 to 40min 40 to 50min 50 to 60min 1h to 1 1 /4h 1 1 /4h to 1h 26min 1h 26min to 1h 37min 1h 37min to 1h 48min over 1h 48min	... ... ... ... ... ... ... ... ... 5	... ... ... ... 3 5 10 15 20 20	... 3 5 5 5 10 15 15 20 25	3 3 6 8 10 15 15 20 25 30	3 5 8 9 12 15 20 25 25 30	7 10 10 15 20 25 25 30 30 35	15 15 20 25 30 35 35 35 40 40	15 25 30 35 35 35 40 40 40 40	46 64 82 100 118 143 163 183 203 228
204*	34	91 1 /2	12 to 20min 20 to 30min 30 to 40min 40 to 50min 50 to 60min 1h to 1h 10min 1h 10min to 1h 20min 1h 20min to 1 1 /2h 1 1 /2h to 1h 40min 1h 40min to 1h 50min over 1h 50min	... ... ... ... 3 3 3 3 5 10 15	... 3 3 3 3 3 4 7 10 15 20	3 3 3 4 5 7 8 10 15 20 25	3 3 4 5 10 12 15 20 25 30 30	5 5 8 15 15 20 25 25 30 30 30	7 10 15 20 20 25 30 35 35 35 35	10 20 25 25 30 35 35 40 40 40 40	20 20 25 30 35 35 40 40 40 40 40	51 67 86 105 124 143 163 183 203 223 238

*     Handworked pumps are unsuitable at this depth.

Table 7.2     Decompression—ordinary time limits, stoppages and air supply

(see s 99 (23) to (26))

depth		pressure	time from leaving surface to beginning of ascent	stoppages in minutes at different depths						total time for ascent	number of cylinders needed*	revolutions of pump	number of workers per shift on pumps
ft	fathoms	lb/in 2		60ft	50ft	40ft	30ft	20ft	10ft	minutes		per minute*
0-33	0-5 1 / 2	0-15	no limit	...	...	...	...	...	...	0 to 1	1	15 to 30†	2
33-42	5 1 / 2 -7	15-18 1 / 2	up to 3hr over 3h	... ...	... ...	... ...	... ...	... ...	... 5	1 to 1 1 / 2 6	2	15 to 20	2
42-48	7-8	18 1 / 2 -21	up to 1h 1 to 3h over 3h	... ... ...	... ... ...	... ... ...	... ... ...	... ... ...	... 5 10	1 1 / 2 6 1 / 2 11 1 / 2	2	20	2
48-54	8-9	21-24	up to 1 / 2 h 1 / 2 to 1 1 / 2 h 1 1 / 2 to 3h over 3h	... ... ... ...	... ... ... ...	... ... ... ...	... ... ... ...	... ... ... ...	... 5 10 20	2 7 12 22	2	20	2
54-60	9-10	24-26 1 / 2	up to 20min 20 to 45min 3 / 4 to 1 1 / 2 h 1 1 / 2 to 2h 2 to 3h over 3h	... ... ... ... ... ...	... ... ... ... ... ...	... ... ... ... ... ...	... ... ... ... ... ...	... ... ... 4 5 10	... 5 10 10 15 20	2 7 12 16 22 32	2	25	4
60-66	10-11	26 1 / 2 -29 1 / 2	up to 15min 15 to 30min 30 to 48min 48 to 60min 1 to 1 1 / 2 h 1 1 / 2 to 2h 2 to 2 1 / 2 h 2 1 / 2 to 3h	... ... ... ... ... ... ... ...	... ... ... ... ... ... ... ...	... ... ... ... ... ... ... ...	... ... ... ... ... ... ... ...	... ... 2 3 4 5 5 10	... 5 8 10 13 15 20 20	2 7 12 15 19 22 27 32	2	25	4
66-72	11-12	29 1 / 2 -32	up to 15min 15 to 25min 25 to 30min 30 to 45min 3 / 4 h to 1h 1 to 1 1 / 2 h 1 1 / 2 to 2h	... ... ... ... ... ... ...	... ... ... ... ... ... ...	... ... ... ... ... ... ...	... ... ... ... ... ... ...	... 2 3 4 5 8 10	2 4 5 9 12 16 20	4 8 10 15 19 26 32	2	25	4
72-78	12-13	32-34 1 / 2	up to 10min 10 to 20min 20 to 30min 30 to 38min 38 to 45min 3 / 4 to 1h 1 to 1 1 / 4 h 1 1 / 4 to 1 1 / 2 h	... ... ... ... ... ... ... ...	... ... ... ... ... ... ... ...	... ... ... ... ... ... ... ...	... ... ... ... ... ... ... ...	... ... 3 4 5 8 9 10	3 5 8 12 15 16 18 20	5 7 13 18 22 26 29 32	2	25	4
78-84	13-14	34 1 / 2 -37	up to 10min 10 to 20min 20 to 30min 30 to 40min 40 to 45min 45 to 55min 55 to 65min 65 to 75min	... ... ... ... ... ... ... ...	... ... ... ... ... ... ... ...	... ... ... ... ... ... ... ...	... ... ... ... ... ... ... ...	... ... 3 4 5 8 9 10	3 5 8 13 15 16 18 20	5 7 13 19 22 26 29 32	2	30†	6
84-90	14-15	37-40	up to 10min 10 to 20min 20 to 30min 30 to 40min 40 to 50min 50 to 60min	... ... ... ... ... ...	... ... ... ... ... ...	... ... ... ... ... ...	... ... ... ... 2 3	1 3 4 5 7 10	3 5 10 15 15 15	6 10 16 22 26 30	2	30†
90-96	15-16	40-42 1 / 2	up to 10min 10 to 20min 20 to 30min 30 to 35min 35 to 45min 45 to 55min	... ... ... ... ... ...	... ... ... ... ... ...	... ... ... ... ... ...	... ... ... ... 2 5	1 3 5 5 8 10	3 5 11 15 15 15	7 11 18 22 27 32	2	30†	6
98-108	16-18	42 1 / 2 -48	up to 5min 5 to 10min 10 to 15min 15 to 20min 20 to 25min 25 to 30min 30 to 35min 35 to 40min	... ... ... ... ... ... ... ...	... ... ... ... ... ... ... ...	... ... ... ... ... ... ... ...	... ... ... ... 1 3 4 5	... ... 3 4 5 7 8 10	3 5 5 8 10 10 15 15	6 8 11 15 19 23 28 33	4	20	1
108-120	18-20	48-53 1 / 2	up to 5min 5 to 10min 10 to 15min 15 to 20min 20 to 25min 25 to 30min 30 to 35min	... ... ... ... ... ... ...	... ... ... ... ... ... ...	... ... ... ... ... ... ...	... ... 2 3 5 5 5	... 2 3 5 5 8 10	4 6 7 8 10 12 15	7 11 15 19 23 28 33	4	20	12
120-132	20-22	53 1 / 2 59	up to 5min 5 to 10min 10 to 15min 15 to 20min 20 to 25min 25 to 30min	... ... ... ... ... ...	... ... ... ... ... ...	... ... ... ... ... ...	... ... 2 3 4 5	... 3 5 7 8 10	5 7 7 10 13 15	8 13 17 23 28 33	4	25	12
132-144	22-24	59-64 1 / 2	up to 6min 6 to 12min 12 to 16min 16 to 20min 20 to 25min	... ... ... ... ...	... ... ... ... ...	... ... ... 1 2	... 3 4 4 5	2 5 7 8 10	5 5 7 10 12	10 16 21 26 32	4	25	12
144-156	24-26	64 1 / 2 -70	up to 5min 5 to 10min 10 to 15min 15 to 20min	... ... ... ...	... ... ... 2	... ... 1 3	... 3 4 5	2 5 7 8	5 5 8 10	10 16 23 31	4	25	12
156-168	26-28	70-75	up to 5min 5 to 10min 10 to 13min 13 to 16min	... ... ... ...	... ... 1 2	... 2 2 3	... 3 4 5	2 5 6 7	5 5 8 10	10 18 24 30	4	30†	12
168-180	28-30	75-80 1 / 2	up to 5min 5 to 9min 9 to 12min 12 to 14min	... ... ... ...	... ... ... 2	... 2 3 3	... 3 4 5	3 5 6 7	5 5 8 10	11 18 24 30	4	30†	12
180-192‡	30-32	80 1 / 2 -86	up to 5min 5 to 10min 10 to 13min	... ... ...	... 1 2	... 2 3	1 3 5	3 6 7	5 8 10	12 23 30	...	...	...
192-204‡	32-34	86-91 1 / 2	up to 7min 7 to 12min	... 2	2 2	2 3	3 5	5 7	5 10	20 32	... ...	... ...	... ...

*     These figures are based on a double-acting pump with cylinder diameter 4 inches, stroke 7 ¹ /2inches, working at 80% efficiency.

†     If 30 revolutions per minute cannot be maintained, another cylinder may be used instead.

‡     Handworked pumps are unsuitable at this depth.

Table 7.3     Decompression times for different periods of exposure to working pressure

(see s 100 (31) and s 101 (31))

gauge in the working chamber lb/in 2	reduced at rate of 5 lb/in 2 /min		further uniform reduction to zero (gauge pressure)
	to gauge pres-sure of lb/in 2	time in min	for periods of 6h or more			for periods of 4h			for periods of 3h			for periods of 2 1 /4h			for periods of 2h		for periods of 1 3 /4h		for periods of 1 1 /2h			for periods of 1 1 /4h		for periods of 1h			for periods of 3 /4h			for periods of 1 /2h
			time in min	min/lb	time in min		min/lb	time in min		min/lb	time in min		min/lb	time in min		min/lb	time in min	min/lb		time in min	min/lb	time in min	min/lb		time in min	min/lb		time in min	min/lb		time in min	min/lb

18 or 19	2	3	4	2.0		3	1.5		3		1.5		2		1.0		2	1.0	2	1.0		1		0.5		1	0.5		1	0.5	1	0.5	1	0.5
20 or 21 22 or 23 24 or 25 26 or 27 28 or 29	3 4 5 6 7	4 4 4 4 4	12 23 34 45 55		4.0 5.7 6.8 7.5 7.9	7 15 25 36 46	2.3 3.7 5.0 6.0 6.6	6 12 19 27 35		2.0 3.0 3.8 4.5 5.0		5 9 14 20 26		1.7 2.2 2.8 3.3 3.7		4 8 12 17 22		1.3 2.0 2.4 2.8 3.1	3 6 10 14 19	1.0 1.5 2.0 2.3 2.7	3 6 9 13 17		1.0 1.5 1.8 2.2 2.4		2 4 7 10 13		0.7 1.0 1.4 1.7 1.9	2 3 5 8 11		0.7 0.7 1.0 1.3 1.6	1 2 4 6 8	0.3 0.5 0.8 1.0 1.1	1 1 2 3 5	0.3 0.2 0.4 0.5 0.7
30 or 31 32 or 33 34 or 35 36 or 37 38 or 39	8 9 10 11 12	5 5 5 5 5	64 73 82 90 99		8.0 8.1 8.2 8.2 8.2	54 63 72 82 91	6.8 7.0 7.2 7.4 7.6	43 52 61 70 79		5.4 5.8 6.1 6.4 6.6		32 39 46 54 63		4.0 4.3 4.6 4.9 5.2		27 34 41 48 56		3.4 3.8 4.1 4.4 4.7	24 30 36 42 49	3.0 3.3 3.6 3.8 4.1	21 26 31 37 43		2.6 2.9 3.1 3.4 3.6		17 21 26 31 36		2.1 2.3 2.6 2.8 3.0	14 17 21 25 29		1.7 1.9 2.1 2.3 2.4	10 12 15 19 22	1.2 1.3 1.5 1.7 1.8	6 8 10 12 14	0.8 0.9 1.0 1.1 1.2
40 to 41 42 or 43 44 or 45 46 or 47 48 or 49	13 14 15 16 17	6 6 6 6 6	106 ... ... ... ...		8.2 ... ... ... ...	98 106 114 121 129	7.6 7.6 7.6 7.6 7.6	87 94 102 110 117		6.7 6.7 6.8 6.9 6.9		71 80 89 97 105		5.5 5.7 5.9 6.1 6.2		64 73 81 90 98		4.9 5.2 5.4 5.6 5.8	56 64 72 80 88	4.3 4.6 4.8 5.0 5.2	48 55 62 69 76		3.7 3.9 4.1 4.3 4.5		40 45 50 56 63		3.1 3.2 3.3 3.5 3.7	32 37 42 47 52		2.5 2.6 2.8 2.9 3.1	25 29 33 37 41	1.9 2.1 2.2 2.3 2.4	16 18 21 24 28	1.2 1.3 1.4 1.5 1.6

50 or 51     52 or 53     54 or 55     56 or 57     58 or 59	18 19 20 21 22	7 7 7 7 7	... ... ... ... ...	... ... ... ... ...	136 ... ... ... ...	7.6 ... ... ... ...	124 131 138 ... ...	6.9 6.9 6.9 ... ...	112 119 127 134 140	6.2 6.3 6.3 6.4 6.4	106 114 120 128 135	5.9 6.0 6.0 6.1 6.1	95 103 110 118 126	5.3 5.4 5.5 5.6 5.7	83 92 100 109 117	4.6 4.8 5.0 5.2 5.3	70 78 87 96 104	3.9 4.1 4.3 4.6 4.7	57 62 68 75 83	3.2 3.3 3.4 3.6 3.8	45 49 54 58 63	2.5 2.6 2.7 2.8 2.9	30 34 38 43 47	1.7 1.8 1.9 2.0 2.1
60	23	7	...	...	...	...	...	...	146	6.4	141	6.1	134	5.8	125	5.4	112	4.9	91	4.0	69	3.0	51	2.2

Note     ‘Periods' referred to in column headings are periods of exposure to working pressure, and should not be confused with working periods at the face.