Regulation .04 Performance Standards for Vaulted Shop-Fabricated ASTs.
Regulation .04 Performance Standards for Vaulted Shop-Fabricated ASTs.LinkCopy Citation
An owner, an operator, and a person in charge of an AST system that installs a shop-fabricated AST in a vault shall:
A.
Construct a UL listed vault;
B.
Ensure the vault and the vaulted AST comply with the design, construction, installation, and operation requirements of:
(1)
This regulation;
(2)
NFPA 30 “Flammable and Combustible Liquids Code”;
(3)
If the vaulted AST is used as part of a motor fuel dispensing facility, NFPA 30A “Code for Motor Fuel Dispensing Facilities and Repair Garages”; and
(4)
NFPA 70 “National Electrical Code” for all electrical wiring;
C.
Ensure the vaulted AST is:
(1)
UL listed for aboveground use and for the type of product being stored;
(2)
Completely enclosed in the vault; and
(3)
Not partially or entirely covered by backfill;
D.
Provide venting for the vault and the vaulted AST according to the following requirements:
(1)
If the AST stores a Class I liquid, vent the vault in accordance with NFPA 30 “Flammable and Combustible Liquids Code”;
(2)
Terminate a normal vent for the vaulted AST:
(a)
Outside of the vault;
(b)
At least 12 feet above ground level; and
(c)
At least 5 feet from a building opening;
(3)
A normal vent for the vaulted AST may not terminate in a location that allows vapors to be trapped by the eaves of a building;
(4)
Ensure that an emergency vent for the vaulted AST is vapor-tight and allows for the venting of vapors inside of the vault; and
(5)
Do not use a long-bolt manhole cover as an emergency vent for the vaulted AST;
E.
Install vapor and liquid detection systems in the vault that meet the following requirements:
(1)
The vapor detection system:
(a)
Is equipped with an on-site alarm that has a battery backup;
(b)
Has vapor detectors located not higher than 12 inches above the lowest point in the vault; and
(c)
Is set to alarm when vapors reach or exceed 25 percent of the lower flammable limit of the oil stored;
(2)
The liquid detection system is:
(a)
Set to alarm upon detection of a liquid; and
(b)
Located in accordance with the liquid detection system manufacturer’s instructions; and
(3)
The vapor and liquid detection systems required under §E(1) and (2) of this regulation are designed so that if either system alarms, a signal alerts the owner, the operator, and the person in charge of the AST system:
(a)
At a constantly attended location where the vaulted AST is located; or
(b)
At another location that is continually monitored; and
F.
Ensure the vaulted shop-fabricated AST complies with the spill and overfill prevention requirements in Regulation .08 of this chapter.