California Code of Regulations › Title 8 - Industrial Relations › Division 1 - Department of Industrial Relations › Chapter 4 - Division of Industrial Safety › Subchapter 7 - General Industry Safety Orders › Group 16 - Control of Hazardous Substances › Article 107 - Dusts, Fumes, Mists, Vapors and Gases › Section 5152 - Ventilation and Personal Protective Equipment Requirements for Grinding, Polishing, and Buffing Operations

Current through Register 2024 Notice Reg. No. 28, July 12, 2024
(a) General. Every establishment performing
						dry grinding, dry polishing, or buffing shall provide suitable hoods or
						enclosures that are connected to exhaust systems which are run continuously
						during operations.
EXCEPTION: When the concentration at the operator's
						  breathing zone of any airborne contaminant generated by such an operation is
						  below the applicable limit prescribed in Section
						  5155 or any other section of Title
						  8.
(b) Hood and Branch Duct
						Performance Requirements.
(1) Hoods connected
						to exhaust systems shall be used, and such hoods shall be designed, located,
						and placed so that the dust or dirt particles shall fall or be projected into
						the hoods in the direction of the air flow. No wheels, discs, straps, or belts
						shall be operated in such manner and in such direction as to cause the dust and
						dirt particles to be thrown into the operator's breathing zone.
(2) Wheels and belts shall have not less than
						the minimum exhaust volumes shown in the following tables:
TABLE V-1. GRINDING AND ABRASIVE CUTTING-OFF
						  WHEELS.
Wheel Diameter
								  (Inches)
Wheel Width
								  (Inches)
Minimum Exhaust Volume (Cubic
								  Feet/Min.)
To 9
1 ½
220
Over 9 to 16
2
390
Over 16 to 19
3
500
Over 19 to 24
4
610
Over 24 to 30
5
880
Over 30 to 36
6
1200
NOTE: For any wheel wider than that shown, increase the
						  table exhaust volume by the ratio of the actual width to the table width.
						  Example: For wheel width = 4 ½ inches. Minimum Exhaust Volume = 4.5/4 x
						  610 = 686 (rounded to 690).
TABLE V-2 BUFFING, POLISHING, AND SCRATCH-BRUSH
						  WHEELS
Wheel Diameter
								  (Inches)
Wheel Width
								  (Inches)
Minimum Exhaust Volume (Cubic
								  Feet/Min.)
To 9
2
300
Over 9 to 16
3
500
Over 16 to 19
4
610
Over 19 to 24
5
740
Over 24 to 30
6
1040
Over 30 to 36
6
1200
TABLE V-3 HORIZONTAL SPINDLE DISC
						  GRINDER
Wheel Diameter (Inches)
Minimum Exhaust Volume (Cubic Feet/Min.)
Single
								  Spindle
Double Spindle
Up to 12
220
610
Over 12 to 19
390
610
Over 19 to 25
610
880
Over 25 to 30
610
1200
Over 30 to 53
880
1770
Over 53 to 72
880
6280
TABLE V-4 VERTICAL SPINDLE DISC
						  GRINDER
Disc Diameter
One-half or More of Disc
								  Covered
Disc not
								  Covered
(Inches)
Exhaust Volume
Exhaust
								  Volume
Number1
(Cubic
								  Feet/Min.)
Number1
(Cubic
								  Feet/Min.)
Up to 20
1
500
2
780
Over 20 to 30
2
780
2
1480
Over 30 to
								  53
2
1770
4
3530
Over 53 to
								  72
2
3140
5
6010
NOTE:1 Number of exhaust
						  outlets around periphery of hood, or equal distribution provided by other
						  means.
TABLE V-5 GRINDING AND POLISHING
						  BELTS
Belts Width
								  (Inches)
Exhaust Volume (Cubic
								  Feet/Min.)
Up to 3
220
Over 3 to 5
300
Over 5 to 7
390
Over 7 to 9
500
Over 9 to 11
610
Over 11 to 13
740
(3) Cradles requiring partial enclosures to
						house the complete operation shall be ventilated sufficiently such that a
						minimum air velocity of 150 feet per minute shall be maintained over the entire
						opening of the enclosure.