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INDUSTRY, LABOR AND HUMAN RELATIONS 33 Ind 8 pressure at not less than 3 pounds per square inch and not more than 5 pounds per square inch. (d) In the case of field erected tanks,the strength test may be consid- ered to be the test for tank tightness. (6) REPAIR OF LEAKS OR DEFORMATIONS.All leaks Or deformations shall be repaired before the tank is placed in service. Mechanical caulking is not permitted for correcting leaks in welded tanks,except pin hole leaks in the roof. (7) TANKS OPERATED AT BELOW DESIGN PRESSURE.Tanks to be operated at pressures below their design pressure may be tested by the applicable provisions of subs. (1) to (4) based upon the pressure developed under full emergency venting of the tank. History:Cr.Register,March, 1982,No.315,elf.4-1-82. Ind 8.19 [2-2] Installation of outside aboveground tanks. (1) IN- STALLATION OF OUTSIDE ABOVEGROUND TANKS WITH RESPECT TO ELECTRICAL LINES. Location of outside aboveground tanks with respect to electrical lines shall conform with the provisions of ch.ILHR 16,Wis.Adm.Code. (2) [2-2.1] LOCATION WITH RESPECT TO PROPERTY LINES, PUBLIC WAYS AND LOCATION WITH RESPECT TO PROPERTY LINES,PUBLIC WAYS AND IMPOR- TANT BUILDINGS ON THE SAME PROPERTY. (a) [2-2.1.1] Every aboveground tank for the storage of Class I. Class II, or Class IIIA liquids,except as provided in par. (b),and of those liquids with boil-over characteristics and unstable liquids,operating at pressures not in excess of 2.5 psig and designed with a weak roof-to-shell seam or equipped with emergency venting devices which will not permit pressures to exceed 2.5 psig,shall be located in accordance with Table 8.19-1. 1.For the purpose of this section,a floating roof tank is defined as one which incorporates either: a.A pontoon or double deck metal floating roof in an open top tank in accordance with nationally recognized standards,or b.A fixed metal roof with ventilation at the top and roof eaves in ac- cordance with nationally recognized standards and containing a metal floating roof or cover meeting any one of the following requirements:A pontoon or double deck metal floating roof meeting nationally recog- nized standards, or, a metal floating cover supported by liquid-tight metal pontoons or floats which provide sufficient buoyancy to prevent sinking of the cover when half of the pontoons or floats are punctured. 2. An internal metal floating pan, roof or cover which does not meet the requirements of subd. 1.,or one which uses plastic foam,except for • seals, for flotation even if encapsulated in metal or fiberglass shall be considered as being a fixed roof tank. (b) [2-2.1.2] Vertical tanks having a weak roof-to-shell seam and storing Class IIIA liquids may be located at one-half the distances speci- fied in Table 8.19-1, provided the tanks are not within a diked area or drainage path for a tank storing a Class I or Class II liquid. (c) [2-2.1.3] Every aboveground tank for the storage of Class I,Class II or Class IIIA liquids,except those liquids with boil-over characteris- tics and unstable liquids, operating at pressures exceeding 2.5 psig or Register,March,1982,No.315