Wika CPB3800 Manuale Utente Scaricare il pdf (Pagina 31)

WIKA operating instructions model CPB3800

14062232.03 12/2013 GB/D

6. Commissioning, operation

6.7 Completion

1. After the test is nished 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 dene 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 certicate supplied with the piston unit.

Cylinder datum

Zero buoyancy datum

▲P due to head eects

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

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Wika CPB3800 Manuale Utente Pagina 31