Natural Gas Pneumatic Devices
This page provides an overview of the natural gas driven pneumatic devices source type reporting requirements for Subpart W.
Please see Reporting Form Instructions on downloading the blank reporting form and uploading the completed reporting form.You may also refer to Optional Calculation Spreadsheet Instructions to download the Subpart W calculation spreadsheet.
The natural gas pneumatic devices source type is applicable to Onshore petroleum and natural gas production (98.236(a)(2)), Onshore natural gas transmission compression (98.236(a)(4)), Underground natural gas storage (98.236(a)(5)), and Onshore petroleum and natural gas gathering and boosting (98.236(a)(9)) facilities.
Indicate if the facility has the source type via the dropdown menu.
If the source type is present, you must report the required elements: 
If the facility has the source type, then indicate whether missing data procedures were used: 
Reporting Requirements
Table B.1.i Pneumatic Devices
Facilities that have any natural gas driven pneumatic devices subject to reporting under 98.232 must report the following data elements for each type of pneumatic device:
Total Number of Natural Gas Pneumatic Devices \[98.236(b)(2)(i)\]
- Total Number Vented Directly to Atmosphere \[98.236(b)(2)(ii)\]
- Total Number Vented Directly to Atmosphere for Which Emissions Were Calculated Using Calculation Method 1 \[98.236(b)(2)(iv)\]
Total Number Vented Directly to Atmosphere for Which Emissions Were Calculated Using Calculation Method 2 \[98.236(b)(2)(v)\]
Total Number Vented Directly to Atmosphere for Which Emissions Were Calculated Using Calculation Method 3 \[98.236(b)(2)(vi)\]
- Total Number Vented Directly to Atmosphere for Which Emissions Were Calculated Using Calculation Method 4 \[98.236(b)(2)(vii)\]
Table B.1.ii Pneumatic Devices Estimated Counts
Facilities in the Onshore petroleum and natural gas production [98.230(a)(2)] or Onshore petroleum and natural gas gathering and boosting [98.230(a)(9)] sectors have the option to estimate the total number of each type of device if it is the facility's first or second year of reporting. The following data elements must be reported:
Are Any of the Device Counts Provided in Table B.1.i Estimated? (Yes / No) [98.236(b)(2)(viii)]
Specify whether the calendar year is the first calendar year of reporting or the second calendar year of reporting (First / Second) [98.236(b)(2)(viii)(C)]
Total Number, Actual Count [98.236(b)(2)(viii)(A)]
Total Number, Estimated Count [98.236(b)(2)(viii)(B)]
Total Number Vented Directly to Atmosphere, Actual Count [98.236(b)(2)(ii)] [98.236(b)(2)(viii)(A)]
Total Number Vented Directly to Atmosphere, Estimated Count [98.236(b)(2)(ii)] [98.236(b)(2)(viii)(B)]
The following data elements must be reported if the associated calculation methods was used in determining emissions. If the associated calculation method was not used by the facility, the data element may be left blank:
Total Number Vented Directly to Atmosphere for Which Emissions Were Calculated Using Calculation Method 1 (Actual Count) [98.236(b)(2)(viii)(A)]
Total Number Vented Directly to Atmosphere for Which Emissions Were Calculated Using Calculation Method 1 (Estimated Count) [98.236(b)(2)(viii)(B)]
Total Number Vented Directly to Atmosphere for Which Emissions Were Calculated Using Calculation Method 2 (Actual Count) [98.236(b)(2)(viii)(A)]
Total Number Vented Directly to Atmosphere for Which Emissions Were Calculated Using Calculation Method 2 Estimated Count)[98.236(b)(2)(viii)(B)]
Total Number Vented Directly to Atmosphere for Which Emissions Were Calculated Using Calculation Method 3 (Actual Count)[98.236(b)(2)(viii)(A)]
Total Number Vented Directly to Atmosphere for Which Emissions Were Calculated Using Calculation Method 3 (Estimated Count)[98.236(b)(2)(viii)(B)]
Total Number Vented Directly to Atmosphere for Which Emissions Were Calculated Using Calculation Method 4 (Actual Count)[98.236(b)(2)(viii)(A)]
Total Number Vented Directly to Atmosphere for Which Emissions Were Calculated Using Calculation Method 4 (Estimated Count) [98.236(b)(2)(viii)(B)]
Table B.2 Calculation Method 1 Pneumatic Device Vented Emissions
Facilities that use Calculation Method 1 when calculating emissions from natural gas driven pneumatic devices are required to report the following data elements:
Measurement Location ID Number \[98.236(b)(3)(i)\]
Flow Monitor Type [98.236(b)(3)(ii)]
Number of Continuous High Bleed Natural Gas Pneumatic Devices Downstream of the Flow Monitor [98.236(b)(3)(iii)]
Number of Intermittent Bleed Devices Natural Gas Pneumatic Downstream of the Flow Monitor [98.236(b)(3)(iii)]
Number of Continuous Low Bleed Natural Gas Pneumatic Devices Downstream of the Flow Monitor [98.236(b)(3)(iii)]
Is there a Natural Gas Driven Pneumatic Pump Downstream of the Flow Monitor? [98.236(b)(3)(iv)]
Total CO2 Emissions Using Calculation Method 1 (mt CO2) [98.236(b)(3)(v)]
Total CH4 Emissions Using Calculation Method 1 (mt CH4) [98.236(b)(3)(vi)]
Table B.3 Calculation Method 2 Pneumatic Device Vented Emissions
Facilities that use Calculation Method 2 when calculating emissions from natural gas driven pneumatic devices are required to report the following data elements:
Primary Measurement Method Used \[98.236(b)(4)(i)(A)\] \[98.236(b)(4)(ii)(B)\]
Number of Years Used in Current Measurement Cycle [98.236(b)(4)(ii)(A)]
Were Emissions from Any Natural Gas Pneumatic Devices at this Facility Calculated Using Equation W-1B? [98.236(b)(4)(ii)(C)]
Emissions Factor Calculated Using Equation W-1A (scf/hour/device) [98.236(b)(4)(ii)(D)(1)]
Total Number of Natural Gas Pneumatic Devices Measured Across All Years Upon Which the Emission Factor is Based [98.236(b)(4)(ii)(D)(2)]
Total Number of Natural Gas Pneumatic Devices that Vent Directly to the Atmosphere that Were Not Directly Measured (Countt in Equation W-1B) [98.236(b)(4)(ii)(D)(3)]
Total CO2 Emissions Using Calculation Method 2 from Devices that Were Not Directly Measured (mt CO2)[98.236(b)(4)(ii)(G)]
Total CH4 Emissions Using Calculation Method 2 from Devices that Were Not Directly Measured (mt CH4)[98.236(b)(4)(ii)(H)]
Facilities in the Onshore Petroleum and Natural Gas Production [98.230(a)(2)], or Onshore petroleum and natural gas gathering and boosting [98.230(a)(9)] sectors must report additional inputs for the following data elements:
- Estimated Average Number of Hours in the Calendar Year that the Pneumatic Devices Were In Service, Tt (hours) [98.236(b)(4)(i)(B)] [98.236(b)(4)(ii)(D)(4)]
- Total Measured CO2 Emissions Using Calculation Method 2 (mt CO2) [98.236(b)(4)(i)(C)] [98.236(b)(4)(ii)(E)]
- Total Measured CH4 Emissions Using Calculation Method 2 (mt CH4) [98.236(b)(4)(i)(D)] [98.236(b)(4)(ii)(F)]
Table B.4 Calculation Method 3 Pneumatic Device Vented Emissions
Facilities that use Calculation Method 3 when calculating emissions from pneumatic devices, and have continuous high bleed and/or continuous low bleed pneumatic devices, are required to report the following data elements, depending upon whether emissions were measured or default emission factors were used:
o To Calculate Emissions, Did You Measure According to 98.233(a)(3)(i)(A) or Use Default Emission Factors According to 98.233(a)(3)(i)(B)? [98.236(b)(5)(i)(A)]
o Primary Measurement Method Used [98.236(b)(5)(i)(B)]
o Total Number of Natural Gas Pneumatic Devices that Vent Directly to the Atmosphere and Measured Using Default Factor [98.236(b)(5)(i)(C)(1)]
o Average Estimated Number of Hours in the Calendar Year that the Pneumatic Devices Were In Service, Tt (hours) [98.236(b)(5)(i)(C)(2)]
o Total CO2 Emissions Using Calculation Method 3 (mt CO2)[98.236(b)(5)(iii)]
o Total CH4 Emissions Using Calculation Method 3 (mt CH4) [98.236(b)(5)(iv)]
Facilities that use Calculation Method 3 when calculating emissions from pneumatic devices, and have intermittent bleed pneumatic devices, are required to report the following data elements:
Primary Monitoring Method Used [98.236(b)(5)(ii)(A)]
Number of Complete Monitoring Surveys Conducted [98.236(b)(5)(ii)(A)]
Total Number of Intermittent Bleed Natural Gas Pneumatic Devices Detected as Malfunctioning in Any Pneumatic Device Monitoring Survey During the Calendar Year [98.236(b)(5)(ii)(B)]
Average Time in the Calendar Year that the Pneumatic Devices Were in Service and Assumed Malfunctioning, Average of Tmal,z (hours) [98.236(b)(5)(ii)(C)]
Total Number of Intermittent Bleed Natural Gas Pneumatic Devices NOT Detected as Malfunctioning in Any Pneumatic Device Monitoring Survey During the Calendar Year [98.236(b)(5)(ii)(D)]
Average Time in the Calendar Year that the Pneumatic Devices Were in Service and Not Malfunctioning, Tavg (hours)[98.236(b)(5)(ii)(E)]
Total CO2 Emissions Using Calculation Method 3 (mt CO2)[98.236(b)(5)(iii)]
Total CH4 Emissions Using Calculation Method 3 (mt CH4) [98.236(b)(5)(iv)]
Table B.5 Calculation Method 4 Pneumatic Device Vented Emissions
Facilities that use Calculation Method 4 when calculating emissions from natural gas driven pneumatic devices are required to report the following data elements:
Estimated Average Number of Hours in the Operating Year that the Pneumatic Devices Were in Service, Tt (hours) [98.236(b)(6)(ii)]
Total CO2 Emissions Using Calculation Method 4 (mt CO2) [98.236(b)(6)(iii)]
Total CH4 Emissions Using Calculation Method 4 (mt CH4) [98.236(b)(6)(iv)]
Table B.6.i Missing Data Procedures Used for Pneumatic Device Emission Calculations Using Method 1
Facilities that use missing data procedures for natural gas driven pneumatic device emission calculations using Calculation Method 1 must report the following:
- Measurement Location ID
Parameters for Calculation Method 1 Emissions [Table B.2]
- Measurement Frequency
Number of quarters missing data procedures were used [98.236(bb)(1)]
Total number of hours in the year missing data procedure was used [98.3(c)(8)] [98.236(bb)(2)]
Procedures used [98.235(h)]
Table B.6.ii Missing Data Procedures Used for Pneumatic Device Emission Calculations Using Method 2
Facilities that use missing data procedures for natural gas driven pneumatic device emission calculations using Calculation Method 2 must report the following:
- Type of Pneumatic Device
Parameters for Calculation Method 2 Emissions [Table B.3]
- Measurement Frequency
Number of quarters missing data procedures were used [98.236(bb)(1)]
Total number of hours in the year missing data procedure was used [98.3(c)(8)] [98.236(bb)(2)]
Procedures used [98.235(h)]
Table B.6.iii Missing Data Procedures Used for Pneumatic Device Emission Calculations Using Method 3
Facilities that use missing data procedures for natural gas driven pneumatic device emission calculations using Calculation Method 3 must report the following:
- Type of Pneumatic Device
Parameters for Calculation Method 3 Emissions [Table B.4]
- Measurement Frequency
Number of quarters missing data procedures were used [98.236(bb)(1)]
Total number of hours in the year missing data procedure was used [98.3(c)(8)]
[98.236(bb)(2)]
Procedures used [98.235(h)]
Table B.6.iv Missing Data Procedures Used for Pneumatic Device Emission Calculations Using Method 4
Facilities that use missing data procedures for natural gas driven pneumatic device emission calculations using Calculation Method 4 must report the following:
- Type of Pneumatic Device
Parameters for Calculation Method 4 Emissions [Table B.5]
- Measurement Frequency
Number of quarters missing data procedures were used [98.236(bb)(1)]
Total number of hours in the year missing data procedure was used [98.3(c)(8)] [98.236(bb)(2)]
Procedures used [98.235(h)]
Total Emissions
The total emissions roll-up at the top of the sheet reflects the sum of each gas emission reported for the source type. These summations are calculated automatically by the Smart Form and tabulated on the Introduction tab.