6 Commissioning – Recommended Practice
Before commissioning and putting into service, the valve tightness must be verified.
6.1 Flushing and Pressure Testing the Pipework
Flushing, "hydro testing" and drying are necessary steps before commissioning or placing the unit in service:
Thorough flushing cleans pipework, valves and fittings from dirt and foreign particles.
To avoid damage to the seat elements during rinsing, the ball valve must
be in the open position.
After cleaning, the flange connections must be checked again.
If necessary, tighten the bolts again.
The ball valve must be operated after flushing.
To prevent damage, the valve must be operated to fully open or to fully closed
position (90°) without intermediate position.
The pressure test of the pipework system confirms the tightness and strength of the system section.
DANGER at Pressure Testing
The operating and test limits of the ball valve according to the
design standard may never be exceeded!
6.2 Positions of the Ball Valve
The ball valve is open when the flat flanks of the 2 flat stem head or the groove on the square stem head are in parallel
to the flow direction.
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