WIKA CPB3800 - Handbuch (Seite 31)

31 WIKA operating instructions model CPB3800
14062232.03 12/2013 GB/D
GB
6. Commissioning, operation
6.7 Completion
1. After the test is finished wind spindle pump handle anti-clockwise to lower pressure.
2. Gently open valve A or B to release residual pressure.
3. Ensure that both valves A and B are fully open.
The system is now ready for another test and any residual pressure is relieved.
6.8 Pressure calculation computer software standard accuracy program
This software enables the user to define his equipment and local conditions (gravity,
temperature), so that when nominal pressures are entered, actual achieved pressures
are displayed
These actual pressures will then be to the standard accuracy of the pressure balance.
To achieve the improved standard accuracy the user must enter the correction factor
given on the improved accuracy certificate supplied with the piston unit.
Cylinder datum
Zero buoyancy datum
▲P due to head effects
Pressure (Pa) = σ • H • g
Where
σ = density (kg/m³)
H = height (in metres)
g = gravity (m/s²)
Density of VG 22 oil = 885 kg/cm³