Overview 

Purpose:

Sensitivity analysis on how scale accuracies effect the relative uncertainty of emission estimates in the electric power equipment manufacture sector (Subpart SS of the MRR)

Developed by: Mollie Averyt, ICF International, maveryt@icfi.com Developed for: U.S. EPAContract: EP-W-07-068, Task Order 68Date: Last major modifications on 07/6/2010
Switch manufacturer (i.e., low and 

medium voltage) Value

Relative Uncertainty

Absolute Uncertainty Accuracy: 

Decreases in SF6 Inventory 5000 0.6% 29.2

SF6 in containers at begin 45000 0.05% 21.2 Inventory weights (incremental) 

SF6 in containers at end 40000 0.05% 20.0 acquisition weights (incremental) 

Acquisitions of SF6 48000 0.44% 210.3 acquisition-cylinders per scale 

SF6 from producers 47000 0.45% 210.2 dispursement weights, all but supplier SF6 returned with equipment 0 1.00% - dispursement weights, return to suppli

SF6 returned after recycling 1000 0.71% 7.1 dispursements-cylinders per scale 

Disbursements of SF6 37600 0.1% 21.2

SF6 in new equipment delivered to customers 37000 0.06% 20.6 Number of scales used by suppliers to 

SF6 returned to suppliers 100 0.58% 0.6

SF6 sent off site for recycling 500 1.00% 5.0SF6 destroyed 0 1.00% -

Emissions 15400 1.4% 213.4

Emission Rate 32%

High Voltage OEM (138KV breakers) Value Uncertainty

Absolute Uncertainty

Decreases in SF6 Inventory -3000 1.3% 39.1

SF6 in containers at begin 75,000 0.04% 27.4

SF6 in containers at end 78,000 0.04% 27.9

Acquisitions of SF6 12,000 0.24% 29.1

SF6 from producers 6,000 0.45% 26.8

SF6 returned with equipment 2,500 0.45% 11.2

SF6 returned after recycling - 1.00% 0.0

Disbursements of SF6 8,400 0.1% 10.9

SF6 in new equipment delivered to customers 7,500 0.12% 9.3

SF6 returned to suppliers 100 0.58% 0.6

SF6 sent off site for recycling 800 0.71% 5.7

SF6 destroyed - 1.00% 0.0

Emissions 600 8.3% 49.9

Emission Rate 5%
Switch manufacturer (i.e., low and 

medium voltage) Value

Relative Uncertainty

Absolute Uncertainty Accuracy: 

Decreases in SF6 Inventory 5000 2.9% 145.8

SF6 in containers at begin 45000 0.24% 106.1 Inventory weights (incremental) SF6 in containers at end 40000 0.25% 100.0 acquisition weights (incremental) 

Acquisitions of SF6 48000 2.19% 1,051.5 acquisition-cylinders per scale 

SF6 from producers 47000 2.24% 1,051.0 dispursement weights, all but supplier SF6 returned with equipment 0 5.00% - dispursement weights, return to suppli

SF6 returned after recycling 1000 3.54% 35.4 dispursements-cylinders per scale 

Disbursements of SF6 37600 0.3% 106.2

SF6 in new equipment delivered to customers 37000 0.28% 103.1 Number of scales used by suppliers to 

SF6 returned to suppliers 100 2.89% 2.9

SF6 sent off site for recycling 500 5.00% 25.0

SF6 destroyed 0 5.00% -

Emissions 15400 6.9% 1,066.9

Emission Rate 32%

High Voltage OEM (138KV breakers) Value Uncertainty

Absolute Uncertainty

Decreases in SF6 Inventory -3000 6.5% 195.6

SF6 in containers at begin 75,000 0.18% 136.9

SF6 in containers at end 78,000 0.18% 139.6

Acquisitions of SF6 12,000 1.21% 145.3

SF6 from producers 6,000 2.24% 134.2

SF6 returned with equipment 2,500 2.24% 55.9

SF6 returned after recycling - 5.00% 0.0

Disbursements of SF6 8,400 0.6% 54.4

SF6 in new equipment delivered to customers 7,500 0.62% 46.4

SF6 returned to suppliers 100 2.89% 2.9

SF6 sent off site for recycling 800 3.54% 28.3

SF6 destroyed - 5.00% 0.0

Emissions 600 41.6% 249.7

Emission Rate 5%
Switch manufacturer (i.e., low and 

medium voltage) Value

Relative Uncertainty

Absolute Uncertainty Accuracy: 

Decreases in SF6 Inventory 5000 0.6% 29.2

SF6 in containers at begin 45000 0.05% 21.2 Inventory weights (incremental) 

SF6 in containers at end 40000 0.05% 20.0 acquisition weights (incremental) 

Acquisitions of SF6 48000 0.38% 182.9 acquisition-cylinders per scale 

SF6 from producers 47000 0.39% 182.8 dispursement weights, all but supplier SF6 returned with equipment 0 0.87% - dispursement weights, return to suppli

SF6 returned after recycling 1000 0.61% 6.1 dispursements-cylinders per scale 

Disbursements of SF6 37600 0.0% 18.5

SF6 in new equipment delivered to customers 37000 0.05% 17.9 Number of scales used by suppliers to 

SF6 returned to suppliers 100 0.50% 0.5

SF6 sent off site for recycling 500 0.87% 4.3SF6 destroyed 0 0.87% -

Emissions 15400 1.2% 186.1

Emission Rate 32%

High Voltage OEM (138KV breakers) Value Uncertainty

Absolute Uncertainty

Decreases in SF6 Inventory -3000 1.3% 39.1

SF6 in containers at begin 75,000 0.04% 27.4

SF6 in containers at end 78,000 0.04% 27.9

Acquisitions of SF6 12,000 0.21% 25.3

SF6 from producers 6,000 0.39% 23.3

SF6 returned with equipment 2,500 0.39% 9.7

SF6 returned after recycling - 0.87% 0.0

Disbursements of SF6 8,400 0.1% 9.5

SF6 in new equipment delivered to customers 7,500 0.11% 8.1

SF6 returned to suppliers 100 0.50% 0.5

SF6 sent off site for recycling 800 0.61% 4.9

SF6 destroyed - 0.87% 0.0

Emissions 600 7.9% 47.5

Emission Rate 5%
Switch manufacturer (i.e., low and 

medium voltage) Value

Relative Uncertainty

Absolute Uncertainty Accuracy: 

Decreases in SF6 Inventory 5000 1.2% 58.3

SF6 in containers at begin 45000 0.09% 42.4 Inventory weights (incremental) 

SF6 in containers at end 40000 0.10% 40.0 acquisition weights (incremental) 

Acquisitions of SF6 48000 0.76% 365.8 acquisition-cylinders per scale 

SF6 from producers 47000 0.78% 365.5 dispursement weights, all but supplier SF6 returned with equipment 0 1.74% - dispursement weights, return to suppli

SF6 returned after recycling 1000 1.23% 12.3 dispursements-cylinders per scale 

Disbursements of SF6 37600 0.1% 36.9

SF6 in new equipment delivered to customers 37000 0.10% 35.9 Number of scales used by suppliers to 

SF6 returned to suppliers 100 1.00% 1.0

SF6 sent off site for recycling 500 1.74% 8.7SF6 destroyed 0 1.74% -

Emissions 15400 2.4% 372.2

Emission Rate 32%

High Voltage OEM (138KV breakers) Value Uncertainty

Absolute Uncertainty

Decreases in SF6 Inventory -3000 2.6% 78.2

SF6 in containers at begin 75,000 0.07% 54.8

SF6 in containers at end 78,000 0.07% 55.9

Acquisitions of SF6 12,000 0.42% 50.6

SF6 from producers 6,000 0.78% 46.7

SF6 returned with equipment 2,500 0.78% 19.4

SF6 returned after recycling - 1.74% 0.0

Disbursements of SF6 8,400 0.2% 18.9

SF6 in new equipment delivered to customers 7,500 0.22% 16.2

SF6 returned to suppliers 100 1.00% 1.0

SF6 sent off site for recycling 800 1.23% 9.8

SF6 destroyed - 1.74% 0.0

Emissions 600 15.8% 95.0

Emission Rate 5%
Switch manufacturer (i.e., low and 

medium voltage) Value

Relative Uncertainty

Absolute Uncertainty Accuracy: 3.30 

Decreases in SF6 Inventory 5000 1.9% 96.2

SF6 in containers at begin 45000 0.16% 70.0 Inventory weights (incremental) 100

SF6 in containers at end 40000 0.17% 66.0 acquisition weights (incremental) 115

Acquisitions of SF6 48000 1.26% 603.5 acquisition-cylinders per scale 5

SF6 from producers 47000 1.28% 603.2 dispursement weights, all but supplier (incremental) 115

SF6 returned with equipment 0 2.87% - dispursement weights, return to supplier (incremental) 10SF6 returned after recycling 1000 2.03% 20.3 dispursements-cylinders per scale 5

Disbursements of SF6 37600 0.2% 60.9

SF6 in new equipment delivered to customers 37000 0.16% 59.2 Number of scales used by suppliers to OEMs 5

SF6 returned to suppliers 100 1.66% 1.7SF6 sent off site for recycling 500 2.87% 14.3SF6 destroyed 0 2.87% -Emissions 15400 4.0% 614.1

Emission Rate 32%

High Voltage OEM (138KV breakers) Value Uncertainty

Absolute Uncertainty

Decreases in SF6 Inventory -3000 4.3% 129.1

SF6 in containers at begin 75,000 0.12% 90.4

SF6 in containers at end 78,000 0.12% 92.2

Acquisitions of SF6 12,000 0.70% 83.4

SF6 from producers 6,000 1.28% 77.0SF6 returned with equipment 2,500 1.28% 32.1

SF6 returned after recycling - 2.87% 0.0

Disbursements of SF6 8,400 0.4% 31.2

SF6 in new equipment delivered to customers 7,500 0.36% 26.6

SF6 returned to suppliers 100 1.66% 1.7SF6 sent off site for recycling 800 2.03% 16.2

SF6 destroyed - 2.87% 0.0

Emissions 600 26.1% 156.8

Emission Rate 5%