Optional Calculation Spreadsheet Instructions

Subpart W All Onshore Equations Calculation Spreadsheet for RY17 to RY23 (Updated February 2023)

Subpart W Calculation Tool for RY24_v6.xlsx (Updated 5/29/2025)

Changes to RY24 Subpart W Calculation Tool for RY24 v5 compared to v1

• Introduction: Corrected error in the applicability cells for the Flare Stacks source for the onshore natural gas transmission compression, underground natural gas storage, LNG storage, and LNG import and export equipment industry segments
• Pneumatic Devices: Corrected issues with Calculation Method 2 where T_t was being improperly factored in the volumetric calculations and updated the column headings
• Pneumatic Pumps: Unlocked the C31 and D31 entry cells that were preventing entry
• Centrifugal and Reciprocating Compressors: Corrected a calculation error in the table for Production and G&B facilities that do NOT use volumetric measurements where all rows of volume calculation were referring to only the first row of input data
• Centrifugal and Reciprocating Compressors: Updated column headings for time and GHG concentrations to include default values
• Centrifugal and Reciprocating Compressors: Added a column to the table for Production and G&B facilities that do NOT use volumetric measurements allowing for entering a count of compressors that use the same conditions to ease data entry and modified the calculations to suit
• Equipment Leaks (Leaks-1): Corrected logic errors in the Equation W-30 calculations that would always result in 0s
• Leaks-1: Removed errant input values left over from testing
• Leaks-2, Leaks-3, and Leaks-4: Editorial changes to text and labels, corrections to conditional formatting, and added jump links to Calculation Method 2 input tables
• Leaks-2 and Leaks-4: Added clarification and more direction to the instructions and contextual error message for the Individual Leaker Table for Calculation Method 1
• Leaks-2 and Leaks-4: Revised per-component mole fraction inputs to no longer be inputs and refer to the facility-level mole fraction inputs
• Leaks-4: Corrected multiple erroneous formulaic references in the calculations for Calculation Method 2

Additional changes from v5 to v6

• (f) Liquids Unloading: Revised the language of the instructive note in the "HRp,q" column heading of the Calculation Methods 2 & 3 table to instruct users to follow a weighted average approach rather than an arithmetic average approach.
• (p) Reciprocating Compressors: Corrected an issue in which the sum of compressors column was referencing the wrong column
• (q) Leaks-2: Updated text alignment of some cells in the first component input table

Equation Y-18 Calculation Spreadsheet.xls

(applicable to RY2017 and prior years)