Intermountain Gas 251210 Rexburg LNG Truck Offload

IPUC Pipeline Safety Inspection
Inspector(s): Perkins, Green Date(s): 251210
Company/Owner: Intermountain Gas Company Unit/OPID: 08160
(IGC)
Standard: ® Training: ❑ TIMP/DIMP: ❑ OQ: ❑
Incident: ❑ Damage Prevention: ❑ Drug & Alcohol: ❑ Inspection Days: 3.0
Inspection Summary
December 10, 2025: (2.0)
Traveled from Idaho Falls to Rexburg, Idaho, to observe the annual LNG vaporization test run and the
off-loading of a 9,000-gallon LNG transport truck.
IGC Vapor Tech(VAP) personnel arrived on site at approximately 0530 hours to perform operational
checks on the vaporization trailer, pump cart, emergency shutdown systems (ESDs), and generator.
Coordination was conducted with the meter inspector and gas measurement personnel to reduce pressure
on the distribution system in preparation for testing.
During the pre-test inspection, the only issue identified was inadequate air pressure on the pump cart,
which was determined to be caused by a plugged port.
Upon our arrival, we were escorted to the control room, where we received a safety briefing, reviewed and
acknowledged the Job Safety Analysis (JSA), and were instructed to leave all electronic devices in the
control room in accordance with site safety protocols.
Vaporization-0800 hours, the vaporization trailer temperature was increased to 140°F and the distribution
system pressure was reduced to 280 PSI to facilitate the introduction of vaporized natural gas. Liquefied
Natural Gas (LNG)was then introduced into the pump trailer.
Once all systems were confirmed to be operating within established parameters, vaporization commenced,
resulting in approximately 5,000 gallons of LNG being successfully vaporized over a 30-minute period.
The vaporization operation concluded at 0930 hours.
Minor issues were observed during the run, including a temporary vapor lock on the supply pump trailer
and a brief flameout on the burner assembly. Both occurrences were quickly resolved and did not impact
the overall operation. The test run was completed successfully and demonstrated effective system
performance.
Offload-0730 hours, the LNG tanker truck arrived on site. Prior to authorizing entry into the facility, VAP
technical personnel performed a comprehensive series of verification and safety checks. All pre-entry
inspections were completed successfully, confirming compliance with established site safety protocols
before the tanker was admitted.
IPUC Form 1 Rev. 12/11/2024

IPUC Pipeline Safety Inspection
Following entry, the driver was escorted to the control room, where a safety briefing was conducted. The
driver reviewed and acknowledged all items outlined in the Job Safety Analysis (JSA) and was informed
of the operational expectations for the offloading process.
At 0815 hours, all Prior to Beginning Offloading checklist items were completed.
At 0830 hours, the Begin Offloading checklist items were verified, and the truck off-loading process
commenced. VAP technical personnel remained in the control building throughout the operation to monitor
gauges, sensors, and system performance, ensuring all equipment operated within established parameters.
At 0930 hours, the off-loading process was completed. All post-offload checklist items were reviewed and
verified by both VAP technicians and the driver, confirming the operation was conducted safely and in
full compliance with procedural requirements.
December 11, 2025: (1.0)
Completed all forms and IA question sets.
Corrective Action Required: ❑ Yes ® No Compliance Letter#: NA
Follow Up Required: ❑ Yes ® No By Date: NA
Lead Inspector: Perkins Date: Reviewer: Brooks Date:
251211
Signature: Signature:
IPUC Form 1 Rev. 12/11/2024