Ys = Qs for all vent stream categories listed in Table 1 except for Category E vent streams where Ys = (Qs) (HT)/3.6 for metric units and Ys = (Qs)(HT)/97 for English units
ETOC is the hourly emissions of TOC, kg/hr (lb/hr)
a, b, c, d, e and f are coefficients
The set of coefficients which apply to a vent stream shall be obtained from Table 1.
NR 440.675(5)(f)1.b.b. Where for a vent stream flow rate that is less than 14.2 scm/min (501 scf/min) at a standard temperature of 20°C (68°F): TRE is the TRE index value
Qs is 14.2 scm/min (501 scf/min)
HT is (FLOW) (HVAL) / Qs
where the following inputs are used:
FLOW is the vent stream flow rate (scm/min) (scf/min), at a standard temperature of 20°C (68°F)
HVAL is the vent stream net heating value MJ/scm (Btu/scf), where the net enthalpy per mole of vent stream is based on combustion at 25°C and 760 mm Hg (77°F and 30 in Hg), but the standard temperature for determining the volume corresponding to 1 mole is 20°C (68°F) as in the definition of Qs
Ys = Qs for all vent stream categories listed in Table 1 except for Category E vent streams, where Ys = QsHT/3.6 for metric units and Ys = QsHT/97 for English units.
ETOC is the hourly emissions of TOC reported in kg/hr (lb/hr)
a,b,c,d,e and f are coefficients
The set of coefficients that apply to a vent stream shall be obtained from Table 1.
NR 440.675(5)(f)2.2. The equation for calculating the TRE index value of a vent stream controlled by a flare is as follows: where:
TRE is the TRE index value
ETOC is the hourly emissions of TOC, kg/hr (lb/hr)
Qs is the vent stream flow rate, scm/min (scf/min) at a standard temperature of 20°C (68°F)
HT is the vent stream net heating value, MJ/scm (Btu/scf), where the net enthalpy per mole of vent stream is based on combustion at 25°C and 760 mm Hg (77°F and 30 in Hg), but the standard temperature for determining the volume corresponding to 1 mole is 20°C (68°F) as in the definition of Qs
a,b,c,d and e are coefficients