Ordinance on Safety and Health of Work under High Pressure
(Revised in terms of the Title March 19, 1977 by Ministry of Labour Ordinance No. 2)
Ministry of Labour Ordinance No. 40, September 30, 1972

Latest Amendments:
Ministry of Health, Labour and Welfare Ordinance No. 171 of July 16, 2001
In Japanese

Attached Table 1

Pressure (MPa)	Duration of work under high pressure (or in compressed air)	Pressure reducing (decompression) rate (min.)
		0.15 MPa	0.12 MPa	0.09 MPa	0.06 MPa	0.03 MPa
0.10 or more and not more than 0.12	Not more than 30 minutes					1	1.2	30	30	335
	30 min. or more and not more than 60 min.					1	1.4	30	30	305
	60 min. or more and not more than 90 min.					1	1.5	30	30	285
	90 min. or more and not more than 120 min.					1	1.6	30	30	265
	120 min. or more and not more than 150 min.					2	1.7	60	30	270
	150 min. or more and not more than 180 min.					3	1.8	60	30	250
	180 min. or more and not more than 210 min.					4	1.9	60	30	230
	210 min. or more and not more than 240 min.					5	1.9	60	30	230
	240 min. or more and not more than 270 min.					5	2.0	150	45	135
	270 min. or more and not more than 300 min.					6	2.0	150	45	105
	300 min. or more and not more than 330 min.					6	2.0	150	45	75
	330 min. or more and not more than 360 min.					7	2.1	150	45	45
0.12 or more and not more than 0.14	Not more than 30 minutes					1	1.3	30	30	295
	30 min. or more and not more than 60 min.					1	1.5	30	30	270
	60 min. or more and not more than 90 min.					1	1.6	30	30	255
	90 min. or more and not more than 120 min.					3	1.7	60	30	255
	120 min. or more and not more than 150 min.					5	1.8	60	30	240
	150 min. or more and not more than 180 min.					6	1.9	60	30	215
	180 min. or more and not more than 210 min.					8	2.0	60	30	210
	210 min. or more and not more than 240 min.					10	2.0	60	30	210
	240 min. or more and not more than 270 min.					10	2.1	150	45	130
	270 min. or more and not more than 300 min.					10	2.1	150	45	100
	300 min. or more and not more than 330 min.					12	2.2	150	45	70
0.14 or more and not more than 0.16	Not more than 30 minutes					1	1.3	30	30	270
	30 min. or more and not more than 60 min.					1	1.5	30	30	250
	60 min. or more and not more than 90 min.					3	1.7	60	30	235
	90 min. or more and not more than 120 min.					5	1.8	60	30	225
	120 min. or more and not more than 150 min.					7	1.9	60	30	210
	150 min. or more and not more than 180 min.					9	2.0	60	30	200
	180 min. or more and not more than 210 min.					11	2.1	90	45	210
	210 min. or more and not more than 240 min.					15	2.2	150	45	135
	240 min. or more and not more than 270 min.					18	2.2	150	45	115
	270 min. or more and not more than 300 min.					23	2.2	150	45	85
Pressure (MPa)	Duration of work under high pressure (or in compressed air)	Pressure reducing (decompression) rate (min.)
		0.15 MPa	0.12 MPa	0.09 MPa	0.06 MPa	0.03 MPa
0.16 or more and not more than 0.18	Not more than 30 minutes					1	1.3	30	30	275
	30 min. or more and not more than 60 min.					5	1.6	30	30	245
	60 min. or more and not more than 90 min.					9	1.8	60	30	235
	90 min. or more and not more than 120 min.					13	1.9	60	30	225
	120 min. or more and not more than 150 min.				2	15	2.0	60	30	215
	150 min. or more and not more than 180 min.				5	20	2.1	90	45	205
	180 min. or more and not more than 210 min.				8	25	2.1	90	45	170
	210 min. or more and not more than 240 min.				9	30	2.2	150	45	110
	240 min. or more and not more than 270 min.				10	35	2.2	150	45	75
	270 min. or more and not more than 300 min.				17	35	2.2	150	45	50
0.18 or more and not more than 0.20	Not more than 30 minutes					1	1.4	30	30	240
	30 min. or more and not more than 60 min.					8	1.6	30	30	220
	60 min. or more and not more than 90 min.					16	1.8	60	30	215
	90 min. or more and not more than 120 min.				7	15	2.0	90	30	195
	120 min. or more and not more than 150 min.				9	20	2.1	90	45	200
	150 min. or more and not more than 180 min.				11	30	2.1	90	45	170
	180 min. or more and not more than 210 min.				15	35	2.2	150	45	100
	210 min. or more and not more than 240 min.				20	40	2.2	150	45	85
	240 min. or more and not more than 270 min.				25	45	2.2.	150	45	50
0.20 or more and not more than 0.22	Not more than 30 minutes					1	1.4	30	30	240
	30 min. or more and not more than 60 min.					11	1.7	60	30	225
	60 min. or more and not more than 90 min.				8	15	1.9	60	30	210
	90 min. or more and not more than 120 min.				12	20	2.0	90	30	210
	120 min. or more and not more than 150 min.				15	30	2.1	90	45	180
	150 min. or more and not more than 180 min.				23	40	2.1	90	45	145
	180 min. or more and not more than 210 min.				25	45	2.2	150	45	90
	210 min. or more and not more than 240 min.				30	50	2.2	150	45	60
	240 min. or more and not more than 270 min.				31	60	2.2	150	45	30
Pressure (MPa)	Duration of work under high pressure (or in compressed air)	Pressure reducing (decompression) rate (min.)
		0.15 MPa	0.12 MPa	0.09 MPa	0.06 MPa	0.03 MPa
0.22 or more and not more than 0.24	Not more than 30 minutes					1	1.4	30	30	215
	30 min. or more and not more than 60 min.					14	1.7	60	30	200
	60 min. or more and not more than 90 min.				9	20	1.9	60	30	185
	90 min. or more and not more than 120 min.				18	30	2.0	90	30	180
	120 min. or more and not more than 150 min.				26	35	2.1	120	45	135
	150 min. or more and not more than 180 min.			5	30	40	2.2	150	45	95
	180 min. or more and not more than 210 min.			10	30	50	2.2	150	45	65
	210 min. or more and not more than 240 min.			14	30	60	2.2	150	45	40
0.24 or more and not more than 0.25	Not more than 30 minutes					1	1.5	30	30	210
	30 min. or more and not more than 60 min.					20	1.8	60	30	195
	60 min. or more and not more than 90 min.				13	25	2.0	90	30	180
	90 min. or more and not more than 120 min.				19	35	2.1	120	45	150
	120 min. or more and not more than 150 min.				33	45	2.1	120	45	110
	150 min. or more and not more than 180 min.			6	35	50	2.2	150	45	70
	180 min. or more and not more than 210 min.			15	35	55	2.2	150	45	50
	210 min. or more and not more than 240 min.			18	35	65	2.2	150	45	20
0.25 or more and not more than 0.27	Not more than 30 minutes					2	1.5	30	30	180
	30 min. or more and not more than 60 min.				10	15	1.8	60	30	170
	60 min. or more and not more than 90 min.				17	30	2.0	90	30	150
	90 min. or more and not more than 120 min.			9	25	35	2.1	120	45	120
	120 min. or more and not more than 150 min.			15	30	45	2.2	150	45	85
	150 min. or more and not more than 180 min.			16	35	55	2.2	150	45	55
	180 min. or more and not more than 210 min.			21	40	60	2.2	150	45	30
Pressure (MPa)	Duration of work under high pressure (or in compressed air)	Pressure reducing (decompression) rate (min.)
		0.15 MPa	0.12 MPa	0.09 MPa	0.06 MPa	0.03 MPa
0.27 or more and not more than 0.29	Not more than 15 minutes						1.3	30	30	195
	15 min. or more and not more than 30 min.					2	1.5	30	30	180
	30 min. or more and not more than 45 min.				3	5	1.7	60	45	165
	45 min. or more and not more than 60 min.				13	15	1.9	60	45	150
	60 min. or more and not more than 75 min.				18	20	2.0	90	45	135
	75 min. or more and not more than 90 min.			4	20	30	2.0	90	45	120
	90 min. or more and not more than 105 min.			11	25	40	2.1	120	45	105
	105 min. or more and not more than 120 min.			13	30	40	2.1	120	45	90
	120 min. or more and not more than135 min.			15	35	45	2.2	150	60	75
	135 min. or more and not more than 150 min.			18	35	45	2.2	150	60	60
	150 min. or more and not more than165 min.			23	35	50	2.2	150	60	45
	165 min. or more and not more than 180 min.			20	40	55	2.2	150	60	30
	180 min. or more and not more than 195 min.			24	40	60	2.2	150	60	15
	195 min. or more and not more than 210 min.			26	40	75	2.2		60	0
0.29 or more and not more than 0.31	Not more than 15 minutes					2	1.3	30	30	180
	15 min. or more and not more than 30 min.					9	1.6	30	30	165
	30 min. or more and not more than 45 min.				11	15	1.8	60	45	150
	45 min. or more and not more than 60 min.				18	25	1.9	60	45	135
	60 min. or more and not more than 75 min.				25	35	2.0	90	45	120
	75 min. or more and not more than 90 min.			10	25	40	2.0	90	45	105
	90 min. or more and not more than 105 min.			12	30	45	2.1	120	45	90
	105 min. or more and not more than 120 min.			15	35	50	2.1	150	60	75
	120 min. or more and not more than135 min.			20	40	50	2.2	150	60	60
	135 min. or more and not more than 150 min.			20	40	60	2.2	150	60	45
	150 min. or more and not more than165 min.			22	40	65	2.2	150	60	30
	165 min. or more and not more than 180 min.			25	40	70	2.2	150	60	15
	180 min. or more and not more than 195 min.		5	25	40	75	2.2		60	0
0.31 or more and not more than 0.33	Not more than 15 minutes					2	1.4	60	30	165
	15 min. or more and not more than 30 min.					13	1.6	60	30	150
	30 min. or more and not more than 45 min.				14	20	1.8	90	45	135
	45 min. or more and not more than 60 min.				21	30	1.9	90	45	120
	60 min. or more and not more than 75 min.			13	25	35	2.0	120	45	105
	75 min. or more and not more than 90 min.			15	35	45	2.1	120	45	90
	90 min. or more and not more than 105 min.		5	15	35	55	2.1	120	45	75
	105 min. or more and not more than 120 min.		9	15	40	60	2.1	150	60	60
	120 min. or more and not more than135 min.		10	20	40	65	2.1	150	60	45
	135 min. or more and not more than 150 min.		12	25	40	65	2.2	150	60	30
	150 min. or more and not more than165 min.		14	25	40	70	2.2	150	60	10
	165 min. or more and not more than 180 min.		16	25	40	75	2.2		60	0
Pressure (MPa)	Duration of work under high pressure (or in compressed air)	Pressure reducing (decompression) rate (min.)
		0.15 MPa	0.12 MPa	0.09 MPa	0.06 MPa	0.03 MPa
0.33 or more and not more than 0.35	Not more than 15 minutes					2	1.4	60	30	150
	15 min. or more and not more than 30 min.					17	1.6	60	30	135
	30 min. or more and not more than 45 min.				15	25	1.8	90	45	120
	45 min. or more and not more than 60 min.			5	20	35	2.0	120	45	105
	60 min. or more and not more than 75 min.			11	25	50	2.0	120	45	90
	75 min. or more and not more than 90 min.			18	30	60	2.0	120	45	75
	90 min. or more and not more than 105 min.			25	35	65	2.1	150	60	60
	105 min. or more and not more than 120 min.		9	25	40	65	2.1	150	60	45
	120 min. or more and not more than135 min.		14	25	40	70	2.2	150	60	30
	135 min. or more and not more than 150 min.		16	25	40	75	2.2	150	60	15
	150 min. or more and not more than165 min.		18	25	40	80	2.2		60	0
0.35 or more and not more than 0.37	Not more than 15 minutes					2	1.4	60	30	135
	15 min. or more and not more than 30 min.					21	1.7	60	45	120
	30 min. or more and not more than 45 min.				20	25	1.9	90	45	105
	45 min. or more and not more than 60 min.			9	25	35	2.0	120	45	90
	60 min. or more and not more than 75 min.		5	15	30	50	2.0	120	45	75
	75 min. or more and not more than 90 min.		12	20	30	60	2.1	120	45	60
	90 min. or more and not more than 105 min.		14	25	35	65	2.1	150	60	45
	105 min. or more and not more than 120 min.	5	15	25	35	70	2.1	150	60	30
	120 min. or more and not more than135 min.	8	20	25	35	70	2.2	150	60	15
	135 min. or more and not more than 150 min.	11	20	25	40	70	2.2	150	60	0
0.37 or more and not more than 0.4	Not more than 15 minutes					2	1.4	60	30	120
	15 min. or more and not more than 30 min.					25	1.7	90	45	105
	30 min. or more and not more than 45 min.				15	35	1.9	90	45	90
	45 min. or more and not more than 60 min.			12	20	45	2.0	120	45	75
	60 min. or more and not more than 75 min.		7	20	30	55	2.0	120	45	60
	75 min. or more and not more than 90 min.		15	20	35	65	2.1	150	60	45
	90 min. or more and not more than 105 min.	7	15	20	35	70	2.1	150	60	30
	105 min. or more and not more than 120 min.	11	15	25	35	70	2.2	150	60	15
	120 min. or more and not more than135 min.	11	20	25	40	70	2.2		60	0

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