COMPLIANCE INFO_PRE 2019 - Laserfiche WebLink

Home Browse Search

CONTAINMENT CALCULATIONS Name of Facility:McDonald Island Underground Natural Gas Storage Facility Containment Calculations:Based on Dimensions Obtained on 1 June 2012 : Containment around Production Fluid Storaae Tank C-30 Measured Heights within Containment(inch) 25.5 26.375 26.375 26.25 26.75 26.75 26.5 25.625 Piping with 0.25 feet outside diameter 29 28.5 60 ft h l 25 feet length Conduit with 0.11 feet outside di X 2. 29.375 28.75 X 22.58 feet length(inclduing riser) 28.5 27.375 0 27.375 26 m 26 25.75 Piping with 0.28 feet outsidediameer Average Height availabel for 27.04 inches X 17.25 feet length(inclduing riser) Piping with 0.29 feet outside diameter containment 2.25 feet X 3.5 feet length Height available for oil retention=2.25feet Heights measured for pedestal for tank(inches) Piping with 0.36 feet outside diameter Width of footing=1.5 feet 20.5 X 17.5 feet length(inclduing riser) Length of footing=12.17 feet 21.5 21.75 Capacity of production fluid storage tank = 26,700 gallons Average Height= 21.25 inches Volume not available for containment 1.77 feet Pedestal for Conduit 0.83 feet outside diameter X 0.17 feet Length 0.21 feet outside diameter X 2.08 Height Volume=(pio X(0.8312 X 0.17)+(0.21^2X2.08))X 7.48 = 4.91 gallons Volume of Piping and Conduits within Containment (pi()X((0.11)^2 X 22.58)+((0.28)^2 X 17.25)+((0.36)^2 X 17.5)+ ((0.25)^2 X 2.25)+((0.29)^2 X 3.5))X 7.48 = 101.718 gallons Volume of Pedestal for Tank 2 X 1.77 X12.17 X 1.5 X 7.48 = 483.378 gallons Therefore total volume not available for containment = 590.00 gallons Volume available for oil retention = [(30.04 X 60 X 2.25)X 7 48-590 = 29,744 gallons > 26,700 gallons (Sufficient for 100%of container) Voulme of 25-year,24-hour precipitation(2.6 inches) = 2,921.1 gallons Volume required to contain capacity of production fluid storage tank and 25-year,24-hour storm precipitation = 29,621 gallons Therefore,the containment is adequate to contain the volume of the oil-filled container in containment and volume of precipitation of a 25-year 24-hour storm in the containment.