// CODE SNIPPET
66.21.7 Operation of Storage Tanks
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Facilities with aboveground tanks that receive and transfer Class I liquids from mainline pipelines or marine vessels shall establish and follow formal written procedures to prevent overfilling of tanks utilizing one of the following methods of protection:
- Tanks shall be gauged at intervals in accordance with established procedures by personnel continuously on the premises during product receipt. Acknowledged communication shall be maintained with the supplier so flow can be shut down or diverted in accordance with established procedures.
- Tanks shall be equipped with a high-level detection device that is either independent of any gauging equipment or incorporates a gauging and alarm system that provides electronic self-checking to indicate when the gauging and alarm system has failed. Alarms shall be located where personnel who are on duty throughout product transfer can arrange for flow stoppage or diversion in accordance with established procedures.
- Tanks shall be equipped with an independent high-level detection system that will automatically shut down or divert flow in accordance with established procedures.
System failure shall include but not be limited to the following:
- Loss of main electrical power
- Electrical break, short circuit, or ground fault in the level detection system circuit or the alarm and signal circuit
- Failure or malfunction of the level detection system control equipment or signaling devices
Formal written procedures required by 188.8.131.52.1 shall include the following:
- Instructions covering methods to check for lineup and receipt of initial delivery to tank designated to receive shipment.
- Provision for training and monitoring the performance of operating personnel by supervisors.
- Schedules and procedures for inspection and testing of gauging equipment and high-level instrumentation and related systems. Inspection and testing intervals shall be approved but shall not exceed 1 year.
An underground tank shall be equipped with overfill prevention equipment that will operate as follows either alert the transfer operator when the tank is no more than 90 percent full by triggering an audible and visual high-level alarm or automatically shut off the flow of liquid into the tank when the tank is no more than 95 percent full. [30:184.108.40.206]
Shop-fabricated aboveground atmospheric storage tanks, constructed to the recognized standards of 220.127.116.11.1.1, shall meet the requirements of 18.104.22.168.6.1 through 22.214.171.124.6.4 whenever the vertical length from the tank bottom to the top of the fill, normal vent, or emergency vent exceeds 12 ft (3.7 m). [30:126.96.36.199]
In no case shall these provisions restrict or interfere with the functioning of the normal vent or emergency vent. [30:188.8.131.52.3]
A sign or marking that meets the requirements of NFPA 704 or another approved system, shall be applied to storage tanks containing liquids. The marking shall be located where it can be seen, such as on the side of the tank, the shoulder of an accessway or walkway to the tank or tanks, or on the piping outside of the diked area. If more than one tank is involved, the markings shall be so located that each tank can be identified. [30:184.108.40.206]
Unsupervised, isolated aboveground storage tanks shall be secured and shall be marked to identify the fire hazards of the tank and the tank's contents to the general public. Where necessary to protect the tank from tampering or trespassing, the area where the tank is located shall be secured. [30:220.127.116.11]
The filling of a tank to be protected by water loading shall be started as soon as floodwaters are predicted to reach a dangerous flood stage. [30:18.104.22.168.1]
Personnel responsible for activating and performing flood emergency procedures shall be trained in their implementation and shall be informed of the location and operation of valves and other controls and equipment necessary to effect the intent of these procedures. Personnel shall also be trained in the procedures required to place the facility back into service following a flood emergency. [30:22.214.171.124]
Underground tanks taken out of service or abandoned shall be emptied of liquid, rendered vapor- free, and safeguarded against trespassing in accordance with this section and in accordance with NFPA 326 or the requirements of the AHJ. The procedures outlined in this section shall be followed when taking underground tanks temporarily out of service, closing them in place permanently, or removing them. [30:126.96.36.199.1]
Underground tanks shall be rendered temporarily out of service only when it is planned that they will be returned to active service, closed in place permanently, or removed within an approved period not exceeding 1 year. The following requirements shall be met:
- Corrosion protection and release detection systems shall be maintained in operation.
- The vent line shall be left open and functioning.
- The tank shall be secured against tampering.
- All other lines shall be capped or plugged.
Underground tanks shall be permitted to be permanently closed in place if approved by the AHJ. All of the following requirements shall be met:
- All applicable AHJs shall be notified.
- * A safe workplace shall be maintained throughout the prescribed activities.
- All flammable and combustible liquids and residues shall be removed from the tank, appurtenances, and piping and shall be disposed of in accordance with regulatory requirements and industry practices, using a written procedure.
- The tank, appurtenances, and piping shall be made safe by either purging them of flammable vapors or inerting the potential explosive atmosphere. Confirmation that the atmosphere in the tank is safe shall be by testing of the atmosphere using a combustible gas indicator if purging, or an oxygen meter if inerting, at intervals in accordance with written procedures.
- Access to the tank shall be made by careful excavation to the top of the tank.
- All exposed piping, gauging and tank fixtures, and other appurtenances, except the vent, shall be disconnected and removed.
- The tank shall be completely filled with an inert solid material.
- The tank vent and remaining underground piping shall be capped or removed.
- The tank excavation shall be backfilled.
Underground tanks and piping shall be removed in accordance with the following requirements:
- The steps described in 188.8.131.52.3.3(1) through 184.108.40.206.3.3(5) shall be followed.
- All exposed piping, gauging and tank fixtures, and other appurtenances, including the vent, shall be disconnected and removed.
- All openings shall be plugged, leaving a 1/4 in. (6 mm) opening to avoid buildup of pressure in the tank.
- The tank shall be removed from the excavated site and shall be secured against movement.
- Any corrosion holes shall be plugged.
- The tank shall be labeled with its former contents, present vapor state, vapor-freeing method, and a warning against reuse.
- The tank shall be removed from the site as authorized by the AHJ, preferably the same day.
Disposal of underground tanks shall meet the following requirements:
- Before a tank is cut up for scrap or landfill, the atmosphere in the tank shall be tested in accordance with 220.127.116.11.3.3(4) to ensure that it is safe.
- The tank shall be made unfit for further use by cutting holes in the tank heads and shell.
All necessary documentation shall be prepared and maintained in accordance with all federal, state, and local rules and regulations. [30:18.104.22.168.7]
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