tk_1000a/b_scf, tk_1000a/b_scf_diff for HRS18006

Estimation of helium SCF in the two buffer tube setups on the HRS backend TK_1000A and TK_1000B. These tanks contain only high pressure gas.

To calculate the gas volume, the density of the helium is calculated according to the pressure PT_1000A or PT_1000B and this is multipled by the empty tank volume to get a mass of helium in lbs, which is converted to SCF.

tk_1000a/b_scf_diff` metrics are way of estimation of how much of the gas was pulled from us by customer during the heat.

The empty volume of TK1000A&B = 182.4 ft3

formula

• tk_1000a/b_scf = scf(density_he(PT1000A/B) * 182.4)
• ft_1002_active_scfm = FT1002 if (XV_1002A_OUT or XV_1002B_OUT) and active_tower_120s where active_tower_120s is positive if for given moment of time there is active tower in time range (-120s, +120s); In RT active_tower_120s checks only if tower is active and current time. Metric is refined at daily recomputing