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Hydrastep Pressure Parts Unit Description
24675030 4-5
4.3 WATER COLUMN (L.P.)
The low pressure water column is manufactured from carbon steel, extruded rectangular
hollow bar. The electrode ports are drilled and fitted with ‘helicoil’ inserts to accept the
electrodes. This thread system gives greater strength than if the electrodes were mounted
directly into tapped ports. Corrosion of the threads is minimised since the ‘helicoil’ inserts are
made of stainless steel.
The top cap and the drain components of the water column are manufactured from forged
carbon steel bar, the drain components being available in ¾" and 1" sizes. A lug is machined
on the top cap to accept a vertical forked member for support of the water column when in
situ.
The steam and water connections are made from 1” N.B SCH 80 carbon steel pipe with weld
preps already machined to weld the water column to the steam system.
The electrode covers are fabricated from stainless steel with support blocks attached to the
column body. The covers are held in place by screw fasteners.
The complete assembly is of welded construction, with the welding to ASME
requirements. The materials and design are to ASME B31.1.
The completed water column undergoes pressure proof tests at 150% of duty pressure after
manufacture.
For further details on the water column dimensions, etc., refer to Figure 1.2 in Chapter 1, part
two of the manual.