recovered_from_customer_process_scfm_<variant>

It defines how much of the frontend gas flow was recovered. It’s computed during the heat only.

formulas for variant

All those formulas are computed only during tower activity (heat).

ft202

ft_202_scfm - sv_205_out_scfm_cb - fcv_204_scfm

ft202_corrected

ft_202_scfm_corrected - sv_205_out_scfm_cb - fcv_204_scfm

fcv202

fcv_202 - sv_205_out_scfm_cb - fcv_207_scfm

ft501

FT501 - sv_205_out_scfm_cb - fcv_207_scfm - xv_208_scfm

ft1002

• ARS16006: process_flow_from_customer_scfm_ft1002 * (1 - FCV204 / FCV202)
• ARS15002: process_flow_from_customer_scfm_ft1002 * (1 - (0.75 * FCV204 + 0.25 * FCV204B + fcv102) / FCV202)
• ARS14002: FT1002 - xv_1005_scfm - fcv_207_scfm + diff(internal_inventory_scf) * 6 (6 converts SCF to SCFM)
• ARS15008: ft1002 - xv_1005_scfm + if_negative(diff(internal_inventory_scf) * 6) (6 converts SCF to SCFM)
• others: ft1002 - xv_1005_scfm + diff(internal_inventory_scf) * 6 (6 converts SCF to SCFM)

ARS15008 requires FCV202 >= 15 to be computed

zt_ft202

Same as ft202, but computed ONLY if FCV_202_ZT > 5

zt_ft501

Same as ft501, but computed ONLY if FCV_202_ZT > 5

pct_fcv_202

process_flow_from_customer_scfm_fcv202 * collection_pct_fcv

pct_fcv_501

process_flow_from_customer_scfm_ft501 * collection_pct_fcv

pct_fcv_1002

process_flow_from_customer_scfm_ft1002 * collection_pct_fcv

cust_ft only for ARS19004

SMC_ATB_SUPPLY_FLOW(if_BAYB_active) + SMC_ATC_SUPPLY_FLOW(if_BAYC_active) - sv_205_out_scfm_cb - fcv_204_scfm

steady_state only for ARS16006

• FT1002 - sv_205_out_scfm_cb(FT1002) - fcv_204_scfm(FT1002) if fcv202 > 5 && fcv204 < 5
• otherwise fallback to variant ft202

sv_205_out_scfm_cb, fcv_204_scfm are based on FT1002 flow when conditions are met

ft_101a only for HRS18006

min(FT_101A - fcv_102_scfm, FT_100)

tk700 only for ARS20009

recovered_from_customer_process_scfm_ft202_corrected + 
    v(tk_700_scf, +10m) - v(tk_700_scf, -20m) + 
    v(hxr_600_ar_scf, +10m) - v(hxr_600_ar_scf, -20m) if !XV1123OUT and !ctx(XV1123OUT, 3m) 
    else recovered_from_customer_process_scfm_ft202_corrected

If XV-1123 is open AND XV-703 is open, then it means virgin gas is coming into the TK-700, which means we’d need to adjust the TK-700 net change. However, this circumstance is expected to be very rare and only possible via manual intervention, so it is fine to omit this condition for now.

tk1101 only for ARS20009

recovered_from_customer_process_scfm_ft202_corrected + 
    v(tk1101_scf, -1m) - tk1101_scf if !XV1123OUT and !ctx(XV1123OUT, 3m) 
    else recovered_from_customer_process_scfm_ft202_corrected