sv_221_to_tk_220_scf, tk_220_scf

sv_221_to_tk_220_scf equals to the estimated flow into the TK-220 directly attributed to the SV_221_OUT flow (but does not include any flow from the SV_221 that is redirected to the cold box via the FCV_207). tk_220_scf is just current Ar content of the tank.

formula

4ft3 is size of TK220 tank ~ 30 gallons

• tk_220_scf = scf(PT222, 4)
• sv_221_to_tk_220_scf computed when greatest(SV_221_OUT, prev(SV_221_OUT)) > 0:
  • ... = scf(sv_205_out_scfm) if prev(PT222) > PT222
  • otherwise ... = scf(PT222 - prev(PT222), 4)