where:
Decrease in SF6 Inventory = (Pounds of SF6 stored in containers at the beginning of the year) - (Pounds of SF6 stored in containers at the end of the year).
Acquisitions of SF6 = (Pounds of SF6 purchased from chemical producers or suppliers in bulk) + (Pounds of SF6 returned by equipment users) + (Pounds of SF6 returned to site after off-site recycling).
Disbursements of SF6 = (Pounds of SF6 contained in new equipment delivered to customers) + (Pounds of SF6 delivered to equipment users in containers) + (Pounds of SF6 returned to suppliers) + (Pounds of SF6 sent off site for recycling) + (Pounds of SF6 sent off-site for destruction).
where:
DGHG = The annual disbursement of SF6 or PFCs sent to customers in new equipment or cylinders or sent off-site for other purposes including for recycling, for destruction or to be returned to suppliers.
Qp = The mass of the SF6 or PFCs charged into equipment or containers over the period p sent to customers or sent off-site for other purposes including for recycling, for destruction or to be returned to suppliers.
n = The number of periods in the year.
where:
Qp = The mass of SF6 or the PFC charged into equipment or containers over the period p sent to customers or sent off-site for other purposes including for recycling, for destruction or to be returned to suppliers.
MB = The mass of the contents of the containers used to fill equipment or cylinders at the beginning of period p.
ME = The mass of the contents of the containers used to fill equipment or cylinders at the end of period p.
EL = The mass of SF6 or the PFC emitted during the period p downstream of the containers used to fill equipment or cylinders and in cases where a flowmeter is used, downstream of the flowmeter during the period p (e.g., emissions from hoses or other flow lines that connect the container to the equipment or cylinder that is being filled).
where:
Qp = The mass of SF6 or the PFC charged into equipment or containers over the period p sent to customers or sent off-site for other purposes including for recycling, for destruction or to be returned to suppliers.
Mmr = The mass of the SF6 or the PFC that has flowed through the flowmeter during the period p.
EL = The mass of SF6 or the PFC emitted during the period p downstream of the containers used to fill equipment or cylinders and in cases where a flowmeter is used, downstream of the flowmeter during the period p (e.g., emissions from hoses or other flow lines that connect the container to the equipment that is being filled).
where:
EL = The mass of SF6 or the PFC emitted during the period p downstream of the containers used to fill equipment or cylinders and in cases where a flowmeter is used, downstream of the flowmeter during the period p (e.g., emissions from hoses or other flow lines that connect the container to the equipment or cylinder that is being filled)
FCi = The total number of fill operations over the period p for the valve-hose combination Ci.
EFCi = The emission factor for the valve-hose combination Ci.
n = The number of different valve-hose combinations C used during the period p.
where:
EI = Total annual SF6 or PFC emissions from equipment installation at electric transmission or distribution facilities.
MF = The total annual mass of the SF6 or PFCs, in pounds, used to fill equipment during equipment installation at electric transmission or distribution facilities.
MC = The total annual mass of the SF6 or PFCs, in pounds, used to charge the equipment prior to leaving the electrical equipment manufacturer facility.
NI = The total annual nameplate capacity of the equipment, in pounds, installed at electric transmission or distribution facilities.
40 C.F.R. §98.453