Pennsylvania Code › Title 34 - LABOR AND INDUSTRY › Part I - Department of Labor and Industry › Chapter 23 - LAUNDERING AND DYEING ESTABLISHMENTS › Subchapter B - DRYCLEANING AND DYEING › SOLVENT TANKS › Section 23.141 - General requirements

Current through Register Vol. 54, No. 28, July 13, 2024
(a)
Underground solvent storage tanks.
Underground storage tanks
					 for Class II and Class III solvents shall be placed at least 2 feet apart, not
					 less than 2 feet below the surface, not less than 2 feet from foundations and
					 footings, and entirely surrounded by clean earth or sand well tamped in place.
					 All tanks shall rest on a 6 inch concrete pad. The limit of individual tank
					 capacity as shown in the table under subsection (b) may not be exceeded without
					 the approval of the Department.
(b)
Construction.
Horizontal tanks used for the storage of
					 volatile or flammable solvents shall be made of galvanized steel, open hearth
					 steel or wrought iron of a minimum gauge United States Standard, depending upon
					 the capacity as given in the following table:
Minimum Thickness
								  Material
Capacity
Gauge
Gauage
								  Equivalent
Pounds per
(in gallons)
(in
								  inches)
Square Foot
1 to 560
15
5/64
3.125
561 to
								  1,000
12
7/64
4.375
1,101 to 4,000
7
3/16
7.50
(c)
Joints.
All joints of
					 tanks shall be riveted and caulked, welded or brazed, and shall be thoroughly
					 and effectively covered with asphaltum or other nonrusting paint or
					 coating.
(d)
Ventilation.
All storage tanks for Class II, III and IV solvents shall have at
					 least a 1 1/4 inch vent pipe and not less than 1 1/2 inches for tanks over
					 3,000 gallons, run from the top of the tank to a point terminating in the
					 atmosphere, without trap, which shall end at least 12 feet above level or
					 source of supply, suitably supported and in a location remote from fire escapes
					 and not nearer than 3 feet measured horizontally and vertically from any window
					 or other opening. The tank vent pipe shall terminate in a gooseneck or other
					 approved vent protected in the outer end by a 30 by 30 mesh brass or equivalent
					 wire screen.
(e)
Filling
					 pipes.
The end of the filling pipe for all underground storage tanks
					 shall be carried to a suitable location outside of any building, and shall be
					 provided with a lock, or equivalent protection, which shall be kept securely
					 locked or closed except during filling operations. This filling pipe shall be
					 closed by an approved cap or plug and, if it is located in a driveway or other
					 places subject to vehicular traffic, set in an approved steel box with cover or
					 otherwise suitably protected to prevent damage to it. A self-closing liquid
					 tight cover shall be required on all inside gauge openings. No gauge opening
					 shall be located below the grade floor but shall be at least one foot higher
					 than the point of fill.
(f)
Inside above ground tanks.
Class II, inside above ground tanks
					 may not exceed 550 gallons and the individual tank capacity may not exceed 275
					 gallons except that treatment tanks or purifiers may not exceed an individual
					 capacity of 350 gallons and shall in no event exceed in capacity any individual
					 storage tank to which they may be connected. Class III clean solvent tanks,
					 dirty solvent tanks, extractor drain tanks, fillers and other such containers
					 shall have an individual capacity not in excess of 275 gallons.