api liquid
TRANSCRIPT
API Liquid Hydrocarbon Measurement Standards Update
David Johnson, Senior Business Analyst - Enterprise Upstream VolumesNovember 2, 2010
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API Liquid Hydrocarbon Measurement Standards Update
API 11.1 and 11.2 - Liquid Hydrocarbon Volume Correction Factors
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Learning Objectives• Review the physical principles underlying EU liquid
hydrocarbon volume correction factor computations API gravity correction for temperature CTL - volume correction for temperature CPL - volume correction for pressure CTPL - combined correction for temperature and pressure
• Understand API 11.1 / 11.2 volume correction factor terminology
• Review API 11.1 - 2004 changes vs. API 11.1 - 1980• Perform Enterprise Upstream (EU) form operations and
computations - tank inventories, run tickets, oil meter readings
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Liquid Hydrocarbon Volume Correction Factors
• Observed (sample) conditions• Standard conditions (60°F, 1 atm)• Liquid (stock tank) conditions• EU first corrects API gravity from observed
(sample) conditions to standard conditions• Volume correction factor is then computed based
on liquid (stock tank) conditions
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Liquid Hydrocarbon Volume Correction Factors
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API 11.1 - 2004 summary of changes
• Increased supported range of API gravity and liquid temperature API gravity range -10 to 100°API (was 0 to 100°API) Temperature range -58 to 302°F (was 0 to 300°F) Pressure range unchanged at 0 to 1500 psi
• Standard density of water 999.016 kg/m3 (was 999.012 kg/m3)
• ITS-90 temperature scale (was ITS-68 temp scale)• VCF rounding is now 5 digits globally• Floating point mathematics instead of integer (fixed-point)
mathematics
API Liquid Hydrocarbon Measurement Standards Update
API 12.1.1 - CTSh correction / FRA adjustment
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Learning Objectives• Review the underlying physical principles of the
CTSh correction and the FRA adjustment• Learn how to perform EU tank details setup
necessary for EU to apply the CTSh correction and the FRA adjustment
• Demonstrate how EU tank inventories and run tickets forms use CTSh and FRA within liquid hydrocarbon volume computations
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Physical Principles and Nomenclature
• NSV = {[(TOV – FW) * CTSh] + FRA} * CTL * BSW NSV - net standard liquid volume (60 degF, 1 atm) TOV - total observed volume (tank top gauge) FW - free water (tank bottoms) CTSh - tank steel shell temperature correction factor FRA - floating roof displacement adjustment CTL - volume correction factor due to temperature BSW - basic sediment and water (%)
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CTSh correction factor• CTSh is the correction factor for the effect of the
temperature, both ambient and liquid, on the shell of the tank
• CTSh = 1 + 2aΔT + a2ΔT2
a - coefficient of thermal expansion per steel type• ΔT = Tsh - Tb
Tsh - temperature of tank shell Tb - base temperature (60 degF)
• Tsh = (7*Tl + Ta) / 8 (non-insulated tanks) Tl - tank liquid temperature Ta - ambient temperature
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CTSh - tank details setup
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FRA adjustment
• NSV = {[(TOV – FW) * CTSh] + FRA} * CTL * BSW • FRA is a positive or negative volume adjustment to
account for displacement of the floating roof• FRA units are barrels• FRA adjustment is not a ‘correction factor• FRA = weight (apparent mass of roof)/(density*CTL)• Two distinct FRA computation methods
Method A - tank strapping includes FRA Method B - tank strapping does not include FRA
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FRA - tank details setup / method A
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FRA - tank details setup / method B
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FRA - EU form examples
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David Johnson, Senior Business Analyst - Enterprise Upstream VolumesNovember 2, 2010