Hydrastep Pressure Parts | Fault Repair and Commissioning |
3.1BACKGROUND
With any steam/water detection gauge, a partial blockage or leak within the pressurised system may result in incorrect water level indication. The Hydrastep water column design is such that density errors in water level indication (due to the water temperature in the column being lower than the water temperature in the boiler drum) are minimised for the temperatures and pressures specified. This is achieved by stimulating condensate flow in the upper part of the column by omitting lagging on the column steam pipe. The flow of condensate maintains the temperature of the water column close to that of the boiler drum.
Caution: If a serious “blow” occurs, immediate attention is required. Ensure that the column or manifold is VALVED OFF AS SOON AS POSSIBLE otherwise any resulting electrode seat erosion may require the removal of the column or manifold for
3.1.1SAFETY PRECAUTIONS 
a)Ensure that tripping, where fitted, is disabled and that the operators are briefed to expect erroneous indications or alarms.
b)Ensure that you know the valve positions and other procedures BEFORE working on the water column.
c)Allow the water column to cool before changing electrodes and check for signs of steam at the drain to ensure complete isolation.
d)Wear industrial gloves to change electrodes.
e)On
f)Refit the electrode covers before pressurising the column.
g)It is strongly recommended that a ‘HOT’ notice is attached to the water column in a prominent position.
h)Ensure that all safe working practices for the media and processes concerned are followed during the installation and maintenance of the equipment.
i)If the equipment is likely to come into contact with aggressive substances, it is the responsibility of the user to take suitable precautions that prevent it from being adversely affected, thus ensuring that the type of protection both mechanical and electrical are not compromised.
j)The equipment, both mechanical and electrical, must not be used as a support for other equipment or personnel.
k)Both mechanical and electrical content of the system must be protected from impact.
l)The Hydrastep installation is not protected by integral over pressure relief valves. Where fitted directly to a boiler installation, ensure the Hydrastep water column and associated pipework are protected from over pressurisation by the boiler safety valves.
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