Installation Procedures | Hydrastep Pressure Parts |
45°
1.5mm
For HP (210 bar) | Material: SA106B | |
| Size: | 1" N.B, Sch. 160 pipe dim. |
For HP (300 bar) | Material: SA479 - 316 | |
| Size: | 1" N.B, Sch. XXS PPE |
For LP | Material: SA106B | |
| Size: | 1" N.B, Sch. 80 pipe dim. |
Figure 2.1 - Universal weld profile
The Steam and Water connections on the water column must be set to position the water column at the correct level before they are welded in place, Figure 2.2 gives an example of the water column installation. Normally, the water level of the drum will be between electrodes 6 and 7 for a twelve port water column. However, due to the physical or operating conditions, this could be offset. The steam leg must slope downwards to the water column with a minimum gradient of 1 in 50 to ensure condensate circulation. The water leg must slope downwards to the drum to prevent water from being trapped at the bottom of the water column.
Caution: Care must be exercised to ensure that the pipework is not allowed to take the unsupported weight of a standard water column. The weight of the column and its associated pipework are fully supported - there must not be any load on the welded pipework attachment points.
Installation should commence with the support of the column, see Figure 2.3. The water column is attached to the supports which will carry the weight of the water column and allow it to be accurately aligned with the drum steam and water connections before and during the welding operation.
After the welding to the connecting pipework, valves and the fitting of the drain pipework is complete, a further check on the level alignment must be carried out and adjustments made, if necessary.
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