// CODE SNIPPET
3406.9 Cargo Tank Loading Rack Systems
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Loading rack systems shall be designed, installed, operated and maintained in accordance with the following requirements:
- Any vapor recovery and processing system used in connection with a loading rack system shall comply with the requirements of FC 3406.8.1 through 3406.8.3.
- Loading racks shall be protected throughout by a fire extinguishing system as set forth in FC3406.4.10.5.1.
- Cargo tanks loaded at bulk plants or terminals shall be compatible with all safety features incorporated into the loading rack.
- Dry-break adapters conforming to API standards shall be provided on the fill and vapor recovery lines. During loading, each cargo tank compartment shall be sealed except for the dry-break fill coupling and vapor recovery line.
- An interlock shall be provided to prevent loading when the cargo tank vehicle motor is running and to prevent start up of the cargo tank vehicle motor during loading. Such interlock device shall further prevent the vehicle motor from starting before the product fill line and vapor return line have been disconnected.
- An interlock device shall be provided so that no loading may take place unless the vapor recovery line is properly connected to the cargo tank.
- Except when loading, protective caps shall cover all dry-break adapters as protection against the elements and physical damage from impact.
- No more than three compartments shall be loaded at a time.
- A two-stage preset meter shall be provided for each loading arm. Loading arms shall be equipped with manual or electronic dead-man control valves.
- All electrical equipment shall be suitable for use in hazardous locations. The design of the electronic sending device shall be such that a source of higher voltage or current cannot be connected to same.
- An approved overfill prevention system shall be provided at the loading rack and shall be designed to ensure at least 1 percent vapor space per compartment. In no event shall the vapor space in a compartment be less than 40 gallons (151 L) in capacity.
- A liquid detector shall be provided in the vapor return line, to automatically shut off the loading system if liquid reaches the vapor line.
- All components of the fill and vapor recovery loading arm assemblies making contact with the cargo tank, including the loading head, shall be constructed of sparkproof material.
- The fill line and the vapor recovery line in loading arm assemblies shall be of the same diameter. The maximum velocity in any liquid line shall not exceed 15 feet per second (4572 mm per second).
- The fill line and vapor recovery line in loading arm assemblies shall be constructed of rigid steel, except that flexible hose may be used for fill or vapor recovery loading assemblies provided that such hose is no longer in length than necessary, has an inner diameter no greater than 4 inches (102 mm), is of steel construction and is rated for not less than 800 pounds per square inch gauge (psig)(5617 kPa).
- Cargo tanks shall not be filled with flammable or combustible liquids unless one or more devices, equipment or systems are provided to immediately shut down the flow of such liquid in the event of cargo tank overfilling, faulty dome seal, cargo tank pressure exceeding 3 pounds per square inch gauge (psig)(21.7 kPa) and electrical grounding fault.
- The loading arm assembly shall be grounded.
- The loading arm assembly shall be designed to break away from the cargo tank without rupture should the cargo tank move with the loading arm still in place.
- All liquid and vapor piping at the loading arm assembly shall be hydrostatically tested to a pressure of 100 pounds per square inch gauge (psig)(690 kPa) or one and one-half (1.5) times the maximum working pressure, whichever is greater, for a period of 2 hours. Such test shall be conducted at the owner's risk by his or her representative before a representative of the department.
- The loading head unit seal against the cargo tank shall not exceed a force of 200 pounds (90.8 kg) or a pressure of 5 pounds per square inch gauge (psig)(34.5 kPa).
- A mist eliminator shall be provided in the vapor line at or adjacent to the loading arm to remove entrained liquid and return same to the cargo tank, or to an approved collection system.
- Cargo tanks containing flammable liquids in any compartment shall not be loaded with combustible liquids unless the loading rack is protected by a fire extinguishing system in accordance with this chapter.
- The loading rate of combustible liquids into cargo tanks shall be such that the initial velocity in the liquid line is 3 feet per second (914 mm per second) and the final rate does not exceed 15 feet per second (4572 mm per second).
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