Hydrastep Pressure Parts | Unit Description |
4.3WATER 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 ΙΧ 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.
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