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Operating and maintenance instructions Section 4: Maintenance
3-9008-701 Rev J January 2015
Calculations 51
Td is the Sensor Mounting Temperature recorded from the water draw procedure.
Eir is the linear coefficient of expansion for the Invar Rods. This value is based on the
temperature units used and will be 0.0000008/ F or 0.00000144/ C.
5. Cpl: This is the compressibility reduction factor for water. This factor is determined by
the following formula:
Where P is the pressure recorded at P1 during the water draw procedure in psig,
or
Where P is the pressure recorded at P1 during the water draw procedure in kPa.
6. Cps: This is the correction factor for the expansion of the flow tube due to pressure.
This factor is determined by the following formula:
Where:
P is the pressure recorded at P1 during the water draw procedure.
D is the inside diameter of the flow tube.
E is the Modulus of elasticity for the material of the flow tube. If pressure is measured in psi,
this value will be 28,500,000 for stainless steel and 30,000,000 for carbon steel. If pressure is
°F °C
Carbon steel 0.0000124 0.0000223
17-4 Stainless steel 0.0000120 0.0000216
Cast 304 Stainless Steel 0.0000177 0.0000319
304 Stainless Steel 0.0000192 0.0000346
32205 Duplex 0.0000152 0.0000274