pratim49
We have medium pressure steam supply to a plant with two parallel orifice flow meters installed side by side, say FT-101 and FT-102. Both lines are insulated upto impulse tubes.
Usually 101 is kept in line and shows flow around 40-45 T/H. Recently we have replaced orifice of FT-102, removed its insulation, and took it in line. For seven days, the meter shows correct readings, reconciled by other meters. Yesterday, the insulation was replaced. Immediately, FT-102 starts showing reduction in flow readings in the tune of almost 10%. As we again remove the insulation, FT-102 starts showing correct readings.
We fail to understand the relation between insulation and flow reading. Could you please provide any feasible cause for this?
Usually 101 is kept in line and shows flow around 40-45 T/H. Recently we have replaced orifice of FT-102, removed its insulation, and took it in line. For seven days, the meter shows correct readings, reconciled by other meters. Yesterday, the insulation was replaced. Immediately, FT-102 starts showing reduction in flow readings in the tune of almost 10%. As we again remove the insulation, FT-102 starts showing correct readings.
We fail to understand the relation between insulation and flow reading. Could you please provide any feasible cause for this?