ATCP 93.350(6)(a)8.8. Venting shall be sized to limit the back pressure to less than the maximum pressure allowed by the design of the system. ATCP 93.350(6)(a)9.9. Tanks fitted with relief valves may not be equipped with an isolation valve below the relief valve unless 2 or more relief valves are provided, and isolation valves are interlocked. ATCP 93.350(6)(a)10.10. Cooled tanks with sealed double-wall construction shall have a pressure relief valve on the outer wall in addition to a pressure relief valve or safety disk on the inner tank. ATCP 93.350(6)(b)(b) Normal venting. Closed-roof atmospheric tanks and low-pressure tanks shall be equipped with normal vents designed to accommodate all of the following conditions: ATCP 93.350(6)(b)2.2. Inbreathing resulting from contraction of vapors caused by a decrease in atmospheric temperature. ATCP 93.350(6)(b)3.3. Outbreathing resulting from maximum inflow of liquid into the tank and maximum evaporation caused by the inflow. ATCP 93.350(6)(b)4.4. Outbreathing resulting from expansion and evaporation that result from maximum increase in atmospheric temperature. ATCP 93.350 NoteNote: Examples of normal venting include pilot-operated relief valves, pressure relief valves, pressure-vacuum valves, conservation vents, open vents, or a combination of devices.
ATCP 93.350(6)(c)1.1. Atmospheric, low-pressure and high-pressure aboveground tanks shall have emergency venting to ensure that the maximum pressure for the tank is not exceeded. ATCP 93.350(6)(c)2.2. Emergency venting shall be designed by a qualified engineer in accordance with good engineering practices. ATCP 93.350 NoteNote: Examples of emergency venting include larger or additional open vents, pressure-vacuum valves, pressure relief valves, a gauge hatch that permits the cover to lift under abnormal internal pressure or a manhole cover that lifts when exposed to abnormal internal pressure.
ATCP 93.350(6)(d)1.1. Where safety, pressure relief or vacuum relief valves are used, each valve shall be permanently labeled with all of the following information: ATCP 93.350(6)(d)1.f.f. The capacity at the indicated pressure or full open vacuum, in either cubic feet of gas per minute or cubic feet of gas per hour. ATCP 93.350(6)(d)2.2. The labeling shall be provided either on the valve itself or on a plate securely fastened to the valve. ATCP 93.350(7)(a)(a) Temperature indicators and corresponding alarms shall be provided for storage tanks where heat from a reaction could cause damage to the system or a release to the environment. ATCP 93.350(7)(b)(b) Heated or cooled tanks shall be equipped with appropriate thermal controls and gauges. ATCP 93.350(7)(c)(c) Protection against overheating or overcooling shall be provided for heated or cooled tanks in accordance with generally accepted engineering practices. ATCP 93.350 NoteNote: Means of protection may include temperature controllers, insulation, alarms, cooling systems, and special material selection.
ATCP 93.350(8)(a)(a) Underground storage tank systems that contain federally regulated hazardous substances shall be equipped with a leak detection system which will detect a leak in the primary containment of the tank and piping. ATCP 93.350(8)(c)(c) Other methods of leak detection may be used if approval from the department is obtained before the installation and operation of the new UST system. ATCP 93.350(9)(9) Corrosion protection. Corrosion protection shall be provided in accordance with s. ATCP 93.520 for underground storage tank systems or s. ATCP 93.400 for aboveground storage tank systems. ATCP 93.350(10)(a)(a) Transfer points shall be labeled with the name of the substance transferred. ATCP 93.350(10)(b)(b) Aboveground tanks storing hazardous substances within the scope of this section shall be identified and labeled in accordance with s. ATCP 93.400 (7). ATCP 93.350 NoteNote: Section ATCP 93.400 (7) requires conformance with NFPA 704. ATCP 93.350(10)(c)(c) All tanks on a property shall have a unique tank identification number that is readily visible to emergency response personnel. ATCP 93.350(11)(11) Inspections, changes in service, tank closure, and releases from a tank. ATCP 93.350(11)(a)2.2. Periodic inspections of aboveground tanks may be conducted in accordance with any nationally recognized standard that is more applicable to hazardous tanks than STI SP001. ATCP 93.350(11)(a)3.3. Existing and new aboveground fiberglass storage tanks shall have certified external tank inspections and certified tank integrity inspections in accordance with HIR FTV RP 2007. ATCP 93.350 NoteNote: Aboveground storage tanks which store hazardous substances and which have a capacity of less than 5,000 gallons are exempt from this chapter unless the substance is also flammable or combustible.
ATCP 93.350 NoteNote: Sections ATCP 93.440 to 93.470 address inspections; seldom-used and temporarily out of service tanks; change in service to store a non-regulated substance; tank closures; tank-system site assessment; and confirming and responding to leaks, spills, overfills and releases. ATCP 93.350 NoteNote: The department accepts use of the following standard for performing periodic inspections under this subdivision: HIR FTV RP 2007, In-Service Inspection of Aboveground Atmospheric Fiberglass Reinforced Plastic Tanks and Vessels, as published by HIR Technical Services. This standard is available by contacting FTPI at http://www.storagetanks.info/FTVRP2007.html. ATCP 93.350 NoteNote: Sections ATCP 93.545 to 93.585 address seldom-used and temporarily out of service tanks; change in service to store a non-regulated substance; tank system closures; conditions indicating releases; tank system integrity assessments; tank system site assessments; and responding to leaks, spills, overfills and releases. ATCP 93.350(13)(13) Security at chemical storage facilities. Owners and operators shall be aware of regulations, standards and operating practices that relate to facility security. ATCP 93.350 NoteNote: Information on how to develop a comprehensive site security program is available in the API document Security Guidelines for the Petroleum Industry, or the American Chemistry Council document, Site Security Guidelines for the U.S. Chemical Industry.
ATCP 93.350 HistoryHistory: CR 17-092: cr. Register October 2019 No. 766, eff. 11-1-19; correction in (1) (b) 5., (4) (b) made under s. 35.17, Stats., Register October 2019 No. 766. ATCP 93.360ATCP 93.360 Storage of Class IA flammable liquids. ATCP 93.360(1)(1) All storage, whether new or existing, of Class IA flammable liquids with a Reid vapor pressure not exceeding 25.3 psig (40 psia) and a boiling point of less than 100o F shall comply with the applicable requirements of NFPA 30 and this chapter, except as provided in sub. (2). ATCP 93.360(2)(2) Design standards for new tank systems do not apply to existing tank systems unless specified otherwise. ATCP 93.360 NoteNote: See ch. SPS 341 for additional requirements that may apply to flammable liquid storage in pressure vessels at pressures greater than 15 psig. ATCP 93.360 HistoryHistory: CR 17-092: cr. Register October 2019 No. 766, eff. 11-1-19. ATCP 93.370ATCP 93.370 Emergency shutoff for transfers. ATCP 93.370(1)(1) An emergency electrical shutoff shall be installed in accordance with NFPA 30A section 6.7 on any new or existing system that provides for the transfer of product from a fixed storage tank system to a tank vehicle rail tank car or vehicle fuel tank. ATCP 93.370(2)(2) The emergency electrical shutoff shall be tested annually. Annual testing for UST systems shall be documented on the functionality verification form, TR-WM-139. ATCP 93.370 HistoryHistory: CR 17-092: cr. Register October 2019 No. 766, eff. 11-1-19. Subch. IV of ch. ATCP 93 NoteNote: The requirements in this subchapter are general requirements. Under s. ATCP 93.020 (7) (b), wherever subchapter III prescribes a specific or more detailed requirement regarding the same subject, that subchapter III requirement governs instead of the requirement in this subchapter. ATCP 93.400(1)(a)(a) General. Tanks designed and built for underground use may not be used aboveground. ATCP 93.400(1)(b)(b) Tanks for Class I, II, or IIIA liquids. Tanks used for aboveground storage of Class I, II, or IIIA liquids shall comply with the tank construction and marking requirements in s. ATCP 93.250. ATCP 93.400(1)(c)(c) Tanks for Class IIIB liquids. Tanks which have a capacity of 1,100 gallons or more and which are used for aboveground storage of Class IIIB liquids shall be listed or shall be acceptable to the department. ATCP 93.400 NoteNote: See s. ATCP 93.130 (5) for listing and labeling requirements for aboveground tanks. ATCP 93.400(1)(d)(d) Tank foundations. Tank foundations shall be designed to prevent uneven settling of the tank. Tank supports shall be placed on a prepared, flat, smooth, and solid surface. ATCP 93.400(2)(a)(a) General. Aboveground storage tank systems shall be protected from excessive external corrosion through the use of paint, protective coatings, or corrosion resistant materials that are applied after the surface has been prepared in accordance with the manufacturer’s recommendations. ATCP 93.400(2)(b)(b) Tank systems. Any portion of an aboveground tank system that is in contact with the ground shall be protected from corrosion by one of the following methods: ATCP 93.400(2)(b)1.1. The tank system is constructed of an inherently corrosion-resistant material. ATCP 93.400(2)(b)2.2. The tank system is isolated from the ground by a method acceptable to the department. ATCP 93.400 NoteNote: Methods of isolation acceptable to the department include dielectric coating, placement on clean concrete, placement on an elevated ring wall, or mounting on listed saddles.
ATCP 93.400(2)(b)3.3. The tank system is protected by a sacrificial anode or impressed current system. ATCP 93.400(2)(b)4.a.a. Single- or double-wall tanks which are constructed of material subject to corrosion and which are supported on runners or tank supports shall be constructed such that the bottom of the tank shell is at least 3 inches but no more than 12 inches above grade, as measured from the lowest point of the tank shell, except the 12-inch maximum does not apply where subd. 4. b. is met. ATCP 93.400(2)(b)4.b.b. The 12-inch maximum in subd. 4. a. may be exceeded where structural fire resistance is provided that complies with NFPA 30 section 22.5.2.4. ATCP 93.400(2)(c)(c) Underground piping. All new and existing underground piping connected to an aboveground tank shall be protected from corrosion using one of the methods in s. ATCP 93.520 (1). ATCP 93.400(2)(d)1.1. Aboveground tank systems equipped with a new sacrificial anode or impressed current corrosion protection system shall follow the installation, operation, maintenance and testing requirements in s. ATCP 93.520. ATCP 93.400(2)(d)2.2. Existing sacrificial anode or impressed current corrosion protection systems shall follow the operation, maintenance and testing requirements in s. ATCP 93.520. ATCP 93.400(3)(a)(a) When any underground piping is installed as part of a new tank system or when 50 percent or more of a run is replaced, the piping shall be provided with approved secondary containment with approved non-discriminating interstitial monitoring, except as specified in par. (g). ATCP 93.400(3)(b)1.1. The material used for fabricating both the primary and secondary containment shall be listed in accordance with a standard that assures liquid- and vapor-tightness. ATCP 93.400(3)(b)2.2. Secondary containment sumps shall be fabricated and installed in a manner that prevents release of liquids. These sumps shall be tested for leaks hydrostatically at installation, in accordance with the manufacturer’s instructions and the adopted standard PEI RP 1200.
