Appendix B

Development of Adjusted New, Revised, and 

Deleted Data Element Counts

Petroleum and Natural Gas Systems (Subpart W)
Tables B-1 through B-8 show how the adjusted counts of new, revised, and deleted data 

elements were developed for each of the petroleum and natural gas systems source category 

(subpart W) industry segments. In each table, the data in columns A through D are derived from 

Tables 1 through 4, respectively. The data in columns E through G are calculated by multiplying 

the percentages in column D by the counts in columns A through C, respectively. The totals in 

columns E through G represent the adjusted counts for the industry segment that are presented in 

Tables 5 and 6.

Table B-1. Onshore Petroleum and Natural Gas Production

Data Element Category

Number of 

New Data 

Elements

(A)

Number of 

Revised 

Data 

Elements

(B)

Number of 

Deleted 

Data 

Elements

(C)

Percentage 

of facilities 

reporting 

these data 

elements

(D)

New Data 

Elements 

Adjusted

(E)

Revised 

Data 

Elements 

Adjusted

(F)

Deleted 

Data 

Elements 

Adjusted

(G)

Natural Gas Pneumatic Device Venting 3 0 0 83.50% 2.5 0 0

Natural Gas Pneumatic Pump Venting 2 0 0 69.38% 1.4 0 0

Acid Gas Removal 16 2 0 5.57% 0.9 0.1 0

Dehydrators 18 0 0 51.49% 9.3 0 0

Well Venting for Liquids Unloading 12 1 0 50.30% 6.0 0.5 0

Completions and Workovers with 

Hydraulic Fracturing

7 1 4 39.36% 2.8 0.4 1.6

Completions and Workovers without 

Hydraulic Fracturing

9 2 0 38.17% 3.4 0.8 0

Onshore Production Storage Tanks 10 1 11 83.70% 8.4 0.8 9.2

Well Testing Venting and Flaring 5 0 0 2.19% 0.1 0 0

Associated Natural Gas Venting and 

Flaring

6 0 0 29.82% 1.8 0 0

Flare Stack Emissions 3 0 0 42.74% 1.3 0 0

Equipment Leaks by Population Counts 5 0 0 94.63% 4.7 0 0

EOR Injection Pump Blowdown 5 1 0 1.39% 0.1 0 0

EOR Hydrocarbon Liquid Dissolved 

CO2

2 0 0 2.58% 0.1 0 0

Combustion 5 0 1 91.25% 4.6 0 0.9

Onshore Petroleum and Natural Gas 

Production

13 0 0 100% 13 0 0

Totals 121 8 16 --- 60 3 12

B-2
Table B-2. Offshore Petroleum and Natural Gas Production

Data Element Category

Number of 

New Data 

Elements

(A)

Number of 

Revised 

Data 

Elements

(B)

Number of 

Deleted 

Data 

Elements

(C)

Percentage 

of facilities 

reporting 

these data 

elements

(D)

New Data 

Elements 

Adjusted

(E)

Revised 

Data 

Elements 

Adjusted

(F)

Deleted 

Data 

Elements 

Adjusted

(G)

Offshore Petroleum and Natural Gas 

Production

2 0 0 100% 2 0 0

Totals 2 0 0 --- 2 0 0

Table B-3. Onshore Natural Gas Processing

Data Element Category

Number of 

New Data 

Elements

(A)

Number of 

Revised 

Data 

Elements

(B)

Number of 

Deleted 

Data 

Elements

(C)

Percentage 

of facilities 

reporting 

these data 

elements

(D)

New Data 

Elements 

Adjusted

(E)

Revised 

Data 

Elements 

Adjusted

(F)

Deleted 

Data 

Elements 

Adjusted

(G)

Acid Gas Removal 16 2 0 55.56% 8.9 1.1 0

Dehydrators 18 0 0 72.22% 13.0 0 0

Blowdown Vent Stacks 8 0 7 66.92% 5.4 0 4.7

Flare Stack Emissions 3 0 0 73.99% 2.2 0 0

Centrifugal Compressors 33 1 6 29.04% 9.6 0.3 1.7

Reciprocating Compressors 33 1 3 74.24% 24.5 0.7 2.2

Equipment Leaks by Leak Detection 3 0 2 93.69% 2.8 0 1.9

Onshore Natural Gas Processing 7 0 0 100% 7 0 0

Totals 121 4 18 --- 73 2 11

B-3
Table B-4. Onshore Natural Gas Transmission Compression

Data Element Category

Number of 

New Data 

Elements

(A)

Number of 

Revised 

Data 

Elements

(B)

Number of 

Deleted 

Data 

Elements

(C)

Percentage 

of facilities 

reporting 

these data 

elements

(D)

New Data 

Elements 

Adjusted

(E)

Revised 

Data 

Elements 

Adjusted

(F)

Deleted 

Data 

Elements 

Adjusted

(G)

Natural Gas Pneumatic Device Venting 3 0 0 70.84% 2.1 0 0

Blowdown Vent Stacks 8 0 7 93.52% 7.5 0 6.5

Transmission Storage Tanks 10 0 0 23.11% 2.3 0 0

Flare Stack Emissions 3 0 0 0% 0 0 0

Centrifugal Compressors 33 1 6 64.15% 21.2 0.6 3.8

Reciprocating Compressors 33 1 3 60.69% 20.0 0.6 1.8

Equipment Leaks by Leak Detection 3 0 0 93.52% 2.8 0 0

Onshore Natural Gas Transmission 

Compression

5 0 0 100% 5 0 0

Totals 98 2 16 --- 61 1 12

Table B-5. Underground Natural Gas Storage

Data Element Category

Number of 

New Data 

Elements

(A)

Number of 

Revised 

Data 

Elements

(B)

Number of 

Deleted 

Data 

Elements

(C)

Percentage 

of facilities 

reporting 

these data 

elements

(D)

New Data 

Elements 

Adjusted

(E)

Revised 

Data 

Elements 

Adjusted

(F)

Deleted 

Data 

Elements 

Adjusted

(G)

Natural Gas Pneumatic Device Venting 3 0 0 77.55% 2.3 0 0

Flare Stack Emissions 3 0 0 0% 0 0 0

Centrifugal Compressors 33 1 6 18.37% 6.1 0.2 1.1

Reciprocating Compressors 33 2 3 95.92% 31.7 1.0 2.9

Equipment Leaks by Leak Detection 3 0 0 83.67% 2.5 0 0

Equipment Leaks by Population Count 3 0 0 79.59% 2.4 0 0

Underground Natural Gas Storage 3 0 0 100% 3 0 0

Totals 81 3 9 --- 48 1 4

B-4
Table B-6. Natural Gas Distribution

Data Element Category

Number of 

New Data 

Elements

(A)

Number of 

Revised 

Data 

Elements

(B)

Number of 

Deleted 

Data 

Elements

(C)

Percentage 

of facilities 

reporting 

these data 

elements

(D)

New Data 

Elements 

Adjusted

(E)

Revised 

Data 

Elements 

Adjusted

(F)

Deleted 

Data 

Elements 

Adjusted

(G)

Equipment Leaks by Leak Detection 9 1 0 56.04% 5 0.5 0

Equipment Leaks by Population Counts 7 0 0 0.00% 0 0 0

Combustion 5 2 1 46.70% 2 0.9 0

Natural Gas Distribution 7 0 0 100.00% 7 0 0

Totals 28 3 1 --- 14 1 0

Table B-7. LNG Import and Export Equipment

Data Element Category

Number of 

New Data 

Elements

(A)

Number of 

Revised 

Data 

Elements

(B)

Number of 

Deleted 

Data 

Elements

(C)

Percentage 

of facilities 

reporting 

these data 

elements

(D)

New Data 

Elements 

Adjusted

(E)

Revised 

Data 

Elements 

Adjusted

(F)

Deleted 

Data 

Elements 

Adjusted

(G)

Blowdown Vent Stacks 8 0 7 87.5% 7 0 6.1

Flare Stack Emissions 3 0 0 0% 0 0 0

Centrifugal Compressors 33 1 6 37.5% 12.4 0.4 2.3

Reciprocating Compressors 33 1 3 87.5% 28.9 0.9 2.6

Equipment Leaks by Leak Detection 3 0 0 100% 3 0 0

Equipment Leaks by Population Counts 3 0 0 62.5% 1.9 0 0

LNG Import and Export Equipment 2 0 0 100.00% 2 0 0

Totals 85 2 16 --- 55 1 11

B-5
Table B-8. LNG Storage

Data Element Category

Number of 

New Data 

Elements

(A)

Number of 

Revised 

Data 

Elements

(B)

Number of 

Deleted

Data 

Elements

(C)

Percentage 

of facilities 

reporting 

these data 

elements

(D)

New Data 

Elements 

Adjusted

(E)

Revised 

Data 

Elements 

Adjusted

(F)

Deleted 

Data 

Elements 

Adjusted

(G)

Flare Stack Emissions 3 0 0 0% 0 0 0

Centrifugal Compressors 33 1 6 0% 0 0 0

Reciprocating Compressors 33 1 3 40.0% 13.2 0.4 1.2

Equipment Leaks by Leak Detection 3 0 0 60.0% 1.8 0 0

Equipment Leaks by Population Count 3 0 0 0% 0 0 0

LNG Storage 3 0 0 100% 3 0 0

Totals 78 2 9 --- 18 0 1

B-6