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reg 4

the lead salt contained in the clear filtrate is then to be precipitated as lead sulphide and weighed as lead sulphate

In force

4 the lead salt contained in the clear filtrate is then to be precipitated as lead sulphide and weighed as lead sulphate

Schedule 7 .

Table 7.1 Decompression—stoppages after exceeding ordinary time limits

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

depthpressuretime from leaving surface to beginning of ascentstoppages at different depths in minutestotal time for ascent
ftfathomslb/in280ft70ft60ft50ft40ft30ft20ft10ftminutes
661129over 3h..................103042
7212322 to 3h
over 3h		...
...		...
...		...
...		...
...		...
...		...
...		10
20		30
30		42
52
7813341/211/2to 21/2h
over 21/2h		...
...		...
...		...
...		...
...		...
...		...
...		20
30		30
30		52
62
84143711/4 to 11/2h
11/2 to 13/4h
13/4 to 2h
2 to 21/2h
21/4 to 21/2h
21/2 to 23/4h
23/4 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
9015401h to 1h 12min
1h 12min to 1hr 20min
1h 20min to 11/2h
11/2h to 1h 44min
1h 44min to 2h
2h to 2h 14min
2h 14min to 21/2h
21/2h 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
9616421/255min to 1h 12min
1h 12min to 11/2h
11/2h to 1h 54mins
1h 54min to 2h 18min
2h 18min to 21/2h
21/2h 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
108184840 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
12020531/235 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
132225930min to 38min
38min to 3/4h
3/4h to 1h
1 to 11/4h
11/4h to 11/2h
11/2h to 13/4h
13/4h to 2h
2 to 21/4h
over 21/4h		...
...
...
...
...
...
...
...
...		...
...
...
...
...
...
...
...
...		...
...
...
...
...
...
...
...
...		...
...
...
...
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
14424641/225 to 32min
32min to 39min
39min to 3/4h
3/4h to 1h
1h to 11/4h
11/4h to 11/2h
11/2h to 13/4h
13/4h to 2h
2 to 21/4h
21/4 to 21/2h
over 21/2h		...
...
...
...
...
...
...
...
...
...
...		...
...
...
...
...
...
...
...
...
...
...		...
...
...
...
...
...
...
...
...
...
...		...
...
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
156267020 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
168287516 to 23min
23 to 30min
30 to 40min
40 to 50min
50 to 60min
1h to 11/4h
11/4 to 11/2h
11/2h 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*30801/214 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*328613 to 20min
20 to 30min
30 to 40min
40 to 50min
50 to 60min
1h to 11/4h
11/4h 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*34911/212 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 11/2h
11/2h 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))

depthpressuretime from leaving surface to beginning of ascentstoppages in minutes at different depthstotal time for ascent number of cylinders needed*revolutions of pumpnumber of workers per shift on pumps
ftfathomslb/in260ft50ft40ft30ft20ft10ftminutesper minute*
0-330-51/20-15no limit ..................0 to 1115 to 30†2
33-4251/2-715-181/2up to 3hr
over 3h		...
...		...
...		...
...		...
...		...
...		...
5		1 to 11/2
6		215 to 202
42-487-8181/2-21up to 1h
1 to 3h
over 3h		...
...
...		...
...
...		...
...
...		...
...
...		...
...
...		...
5
10		11/2
61/2
111/2		2202
48-548-921-24up to 1/2h
1/2 to 11/2h
11/2 to 3h
over 3h		...
...
...
...		...
...
...
...		...
...
...
...		...
...
...
...		...
...
...
...		...
5
10
20		2
7
12
22		2202
54-609-1024-261/2up to 20min
20 to 45min
3/4 to 11/2h
11/2 to 2h
2 to 3h
over 3h		...
...
...
...
...
...		...
...
...
...
...
...		...
...
...
...
...
...		...
...
...
...
...
...		...
...
...
4
5
10		...
5
10
10
15
20		2
7
12
16
22
32		2254
60-6610-11261/2-291/2up to 15min
15 to 30min
30 to 48min
48 to 60min
1 to 11/2h
11/2 to 2h
2 to 21/2h
21/2 to 3h		...
...
...
...
...
...
...
...		...
...
...
...
...
...
...
...		...
...
...
...
...
...
...
...		...
...
...
...
...
...
...
...		...
...
2
3
4
5
5
10		...
5
8
10
13
15
20
20		2
7
12
15
19
22
27
32		2254
66-7211-12291/2-32up to 15min
15 to 25min
25 to 30min
30 to 45min
3/4h to 1h
1 to 11/2h
11/2 to 2h		...
...
...
...
...
...
...		...
...
...
...
...
...
...		...
...
...
...
...
...
...		...
...
...
...
...
...
...		...
2
3
4
5
8
10		2
4
5
9
12
16
20		4
8
10
15
19
26
32		2254
72-7812-1332-341/2up to 10min
10 to 20min
20 to 30min
30 to 38min
38 to 45min
3/4 to 1h
1 to 11/4h
11/4 to 11/2h		...
...
...
...
...
...
...
...		...
...
...
...
...
...
...
...		...
...
...
...
...
...
...
...		...
...
...
...
...
...
...
...		...
...
3
4
5
8
9
10		3
5
8
12
15
16
18
20		5
7
13
18
22
26
29
32		2254
78-8413-14341/2-37up 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		230†6
84-9014-1537-40up 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		230†
90-9615-1640-421/2up 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		230†6
98-10816-18421/2-48up 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		4201
108-12018-2048-531/2up 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		42012
120-13220-22531/259up 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		42512
132-14422-2459-641/2up 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		42512
144-15624-26641/2-70up 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		42512
156-16826-2870-75up 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		430†12
168-18028-3075-801/2up 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		430†12
180-192‡30-32801/2-86up 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‡32-3486-911/2up 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 71/2inches, 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/in2reduced at rate of 5 lb/in2/minfurther uniform reduction to zero (gauge pressure)
to gauge pres-sure of lb/in2time in minfor periods of 6h or morefor periods of 4hfor periods of 3hfor periods of 21/4hfor periods of 2hfor periods of 13/4hfor periods of 11/2hfor periods of 11/4hfor periods of 1hfor periods of 3/4hfor periods of 1/2h
time in minmin/lbtime in minmin/lbtime in minmin/lbtime in minmin/lbtime in minmin/lbtime in minmin/lbtime in minmin/lbtime in minmin/lbtime in minmin/lbtime in minmin/lbtime in minmin/lb
18 or 19 2342.031.531.521.021.021.010.510.510.510.510.5
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
60 237..................1466.41416.11345.81255.41124.9914.0693.0512.2

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.

Schedule 8 Medical standards and examination report for compressed air workers

The medical standards required for workers in compressed air are as follows:

(a)

age and physique—

(i)

the worker shall be well-developed and healthy but not above the average weight/height ratio; and

(ii)

the worker shall be intelligent, active and have good sight and hearing; and

(ii)

there shall be no marked development of adipose tissue nor evidence of premature senility.

(b)

respiratory system—

(i)

there shall be no disease of the respiratory system; or

(ii)

there shall be no disease of the middle ear or blockage of the Eustachian tubes; or

(ii)

there shall be no disease of the the pharynx or frontal sinuses.

(c)

circulatory system—

(i)

there shall be no evidence of disease of the heart or the blood vessels; and

(ii)

the arteries shall not be thickened or the blood pressure above a figure normal for the age.

(d)

nervous system—

(i)

there shall be no disease of the nervous system or special senses; and

(ii)

ther shall be no evidence of neurasthenia, neurosis or psychosis.

(e)

renal system—

(i)

there shall be no evidence of disease of the kidneys or bladder; and

(ii)

there shall be no evidence of either albuminuria or glucosuria.

Examination report for compressed air workers

Name of applicant…………………………………………age………….

General physical condition……………………………………………….

……………………………………………………………………………

……………………………………………………………………………

Respiratory system:

lungs……………………………………………………….……..

nose, ears, throat…………………………………………………

sinuses……………………………………………………………

Circulatory system:

blood pressure……………………………………………………

heart………………………………………………………………

Nervous system…………………………………………………………..

Renal system……………………………………………………………...

Urine:

Result of chest X-ray examination……...………………………………..

……………………………………………………………………………

I certify that I have carefully examined…………………………………..

and consider that he/she is fit/not fit to work under compressed air conditions.

(In the event of an unfavourable opinion, please state reasons.)

…………………………………………………………………………….

…………………………………………………………………………….

Signature of medical officer

……………………………..

Dated:

Schedule 9 Symptoms and treatment of compressed air illness

Symptoms of compressed air illness

1 The symptoms of compressed air illness are due to the liberation of bubbles of nitrogen in the blood or tissues and usually occur after the return of a person to normal air pressure.

2 The time of onset is generally a few minutes after decompression has been completed, but may be delayed as much as 4 hours, occasionally a case may occur during decompression.

Forms of compressed air illness

3 The different forms that compressed air illness may assume are very numerous, and any illness or unusual symptoms after compression should be investigated at once with a view to eliminating compressed air illness.

4 If any doubt exists, it is wise to place the person concerned under a small pressure to ascertain if there is any alleviation of the symptoms.

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