Hydrastep Pressure Parts | Fault Repair and Commissioning |
3.2.2WATER COLUMN TRANSIENT RESPONSE
Starting with the water level at or below
The measured times should be similar to those obtained when the Hydrastep was first commissioned, provided that the drum operating conditions are similar. The usual times are in the region of 60 seconds for the rising levels and 5 to 15 seconds for the falling levels. Any serious variation from these times for a ‘standard length column’ suggests either a partial blockage or the water valve failing to seal properly.
Note: A ‘standard length column’ is 550mm (22 inches) sight range. Larger sight ranges will proportionally extend the water level rise and fall times.
3.2.3WATER COLUMN OR PIPEWORK BLOCKAGE
If a blockage, either partial or complete, is diagnosed from the response times, isolate the column as described in ‘Water Column Isolation’,
Note: Ensure that all valves are left correctly set and locked.
3.2.4WATER COLUMN LIFE
The water column life may be reduced if the water quality is not monitored and kept chemically inert and pure. The end user is advised to pay particular attention to this water quality requirement to safeguard the longevity of the Hydrastep pressure parts.
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