NHDES rules that apply to Diesel Generator Aboveground Storage Tank (AST) Installations and Replacements

NHDES rules that apply to Diesel Generator Aboveground Storage Tank (AST) Installations and Replacements

The New Hampshire Department of Environmental Services (NHDES) has updated the applications process for Aboveground Storage Tank (AST) installations (capacity of 660-gallons or larger) connected to backup generators.

Use of fuel from AST storage can power a generator and maintain a choice level of consistent uninterrupted support for customers’ technology and a range of other business needs and functions.

Diesel Generator Aboveground Storage Tank

One important part of the process is that before a new or replacement AST equipment is installed, complete plans and specifications must be submitted for approval to NHDES at least 45 days prior to construction.  The rules can be found in sections 307.01 through 307.06 of the NH Administrative Rules for Aboveground Storage Tanks.

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Summary of the steps that must take place before a new/replacement AST is brought online:

  • DES must approve all use applications and tank equipment plans.
  • The AST and generator connections must pass inspection by the DES
  • The ICC certified “U5” installer must submit a letter confirming the installation meets Env-Or 307.09(b).
  • If storage size of more than 1,320 gallons of fuel (excluding heating oil) is requested, an updated SPCC plan must be submitted.

Diesel Generator Storage Tank Plans

In order to standardize the plan submittal process, DES has provided example project plans. The goal is to speed up the approval process for ASTs connected to diesel generators.

The AST application and example plans can be found here:

Standards that apply to Emergency Standby Generators:

  • NFPA 30 Flammable and Combustible Liquids
  • NFPA 37 Standard for the Installation and Use of Stationary
  • Combustion Engines and Gas Turbines, and NFPA 110 Standard for Emergency and Standby Power Systems.
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