Attachment_B_Tank_Inventory_1.pdf

This is a Technical Specifications Report for propane tank sizes prepared by the United States Department of the Interior National Park Service for Mount Rainier National Park, dated March 29, 2025, and prepared by Frances Holmgren, Facilities Operations Specialist.

The report provides detailed technical specifications for four standard propane tank sizes commonly used for residential, commercial, and industrial applications: 120 gallons, 250 gallons, 500 gallons, and 1000 gallons. The 120-gallon tank has a capacity of 120 gallons (usable capacity approximately 96 gallons at 80% fill), dimensions of 4 feet length by 30 inches diameter, empty weight of 200-300 lbs, and full weight of 600-700 lbs, with typical applications in small residential heating, water heaters, stoves, and small-scale propane needs. The 250-gallon tank holds 250 gallons (usable capacity approximately 200 gallons at 80% fill), measures 5 feet by 30 inches diameter, weighs 300-400 lbs empty and 1,000-1,200 lbs full, and is suitable for medium-sized residential homes and small businesses with propane-powered appliances. The 500-gallon tank contains 500 gallons (usable capacity approximately 400 gallons at 80% fill), measures 8 feet by 37-40 inches diameter, weighs 600-700 lbs empty and 2,000-2,200 lbs full, and serves larger residential properties, multi-appliance homes, and small commercial properties. The 1000-gallon tank holds 1000 gallons (usable capacity approximately 800 gallons at 80% fill), measures 10 feet by 41-48 inches diameter, weighs 1,200-1,500 lbs empty and 4,500-5,000 lbs full, and is primarily used for commercial, agricultural, or industrial applications and large residential estates. All tanks are steel construction.

The report establishes installation, safety, and regulatory requirements including horizontal installation orientation, clearance requirements per local, state, and federal regulations, compliance with NFPA 58 standards for propane storage and handling, and adequate pressure relief valves and venting systems. Inspection and maintenance protocols require routine inspections by licensed professionals to assess for leaks, corrosion, and mechanical defects. Environmental and safety protocols specific to Mount Rainier National Park mandate careful site selection to minimize environmental impact, appropriate spill containment measures with secondary containment systems, and established emergency response plans with trained personnel for leak detection, containment, and evacuation procedures. The document is intended for use by National Park Service personnel and contractors involved in propane system installation, inspection, and maintenance at Mount Rainier National Park.