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Commission approves conditional use for two 90,000‑gallon LPG tanks at Casper industrial lot
Summary
The commission approved Midstream Energy Partners’ conditional‑use permit to place two 90,000‑gallon LPG tanks at a heavy‑industrial site after staff review and a third‑party fire‑safety analysis; applicants said the operation will be closed‑loop and will meet NFPA/NFPA‑58 standards and other federal/state requirements.
The Natrona County Commission on March 4 approved a conditional‑use permit (CUP26‑01) allowing Midstream Energy Partners to install two 90,000‑gallon liquefied petroleum gas (LPG) tanks at a heavy‑industrial lot on North Six Mile Road.
Planning staff briefed the commission that the application met the county’s CUP criteria for the heavy‑industrial district and that internal reviewers (county fire, road and GIS) raised no blocking concerns. The proposal required a CUP because the proposed storage exceeds the 12,000‑gallon threshold set in the zoning code.
Applicant representatives described the operation as a closed‑loop blending and transfer system: butane will be moved by truck from nearby rail facilities into the tanks, then injected into the operator’s pipeline for blending activities. The company said it has applied for required air permits with the Wyoming Department of Environmental Quality and will implement Process Safety Management (OSHA) and a Risk Management Plan (EPA) as required for operations of this type.
A third‑party fire‑safety analysis included in the application evaluated hydrant capacity, emergency‑response distances and potential fire/explosion scenarios; the report found nearby hydrants capable of delivering 1,500 gallons per minute and a county fire response time of about 19 minutes. Applicants said tanks and piping include pressure‑safety valves, breakaway connections and remote fail‑close shutdowns.
A neighboring property owner submitted a letter with concerns but did not ask for denial; the county also received an informational comment from the airport saying it had no concerns. After public comment and questions, the commission voted to approve the CUP with staff findings incorporated.
The approval requires applicants to meet all applicable international fire code, WDEQ and federal requirements during construction and operation, and staff will track permit conditions and follow‑up reviews.
