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Description

Usage of an unmeasured site fuel device presents the risk of an inaccurate estimate being used, resulting in an audit challenge and probable rework. If your company does not use a standardised process for calculating estimated site fuel gas amounts, Facility Studio provides an option, further outlined below. A check can also be performed to compare the actual metered fuel gas usage per month with the theoretical volume. The actual usage for a compressor should be between 45% and 110% of the base usage of roughly 500m3 /day per 100 HP. This is because a compressor generally runs near full time, and cannot be idled below a certain RPM. The actual measured usage for a fired vessel should be between 10% and 110% of the base usage of 500m3 /day per 600,000 BTU’s of firing capacity. The percentage of time that a fired vessel fires is highly variable as it turns on and off frequently. This makes it more difficult to validate the actual usage rates. This is part of the reason why it is currently not a requirement to put the fired vessel rating on measurement schematics. This type of crosscheck can reveal significant errors, such as broken meters or positive displacement meters in gas services that are not being compensated by the pressure and temperature. Refer to Value Add #5 “Positive Displacement – Fuel Gas Measurement” (Page 9) for more information on this.

How Facility Studio provides value

The  following  formulas  will  generate  consistent  estimated  fuel  gas  usage  values  for  monthly  allocation  calculations.  When  assessing  the   calculations,  keep  in  mind  that  Catadyne  Heaters  are  typically  turned  on  at  all  times  during  the  winter  months  only.
These  calculations  are  comprised  of  the  Canadian  Association  of  Petroleum  Producers  recommended  practice  (refer  to  module  11)  and  additional   information  for  Catadyne  heaters  and  a  small  modification  to  the  total  engine  HP  calculation  that  improves  the  compressor  fuel  usage  curve.

Facility Studio  provides  six  attributes  for  site  fuel  gas  allowing  you  to  manually  calculate  these  values
FS Attribute Multiplied By Fixed Usage Factors Equal Eastimate Site Fuel Based On Maximum Production Hours
FS: Total Engine (HP) 8 for HP between 0-50
+ 2 for HP between 50-100 + 5 for HP over 100
{ } m3 /day
FS: Total Capacity (MMBTU/hr) 900 { } m3 /day
FS: Total Catadyne Heaters Sq. Ft. 2.7 { } m3 /day
FS: Total High Bleed Loops (#) 48 { } m3 /day
FS: Total Low Bleed Loops (#) 12 { } m3 /day
FS: Total Pneumatic Pumps (gallons/day) 1.4 { } m3 /day
FS Attribute Multiplied By Fixed Usage Factors Equal Estimate Site Fuel Based On Maximum Production Hours
FS:Total Engine(HP) If HP is 300 (50  x  8  =  400)
+
  (100  x  2  =  200)
+
  (150  x  5  =  750)

400+200+750=1,350
1,350 m3 /day
FS:TotalCapacity(MMBTU/hr)=0   0X900= 0 m3/day
FS: Total Catadyne Heaters Sq. Ft.=4 4X2.7= 10.8 m3/day
FS: Total High Bleed Loops (#)=1 1x48 { } m3 /day
FS: Total Low Bleed Loops (#)=1 1X12 12 m3/day
FS: Total Pneumatic Pumps (gallons/day)=1.5 1.5X1.4 2.1 m3 /day