Hook up condensate line trap, first for steam solutions
For most drain points, sizing the trap to pass twice the running load at the working pressure minus any backpressure will allow it to cope with the start-up load. When this is the case, each discharge line is sized by moving up to the next size on the chart, as previously discussed in this Module.
Although the amount of flash steam produced see Figure The chart Figure Factors having a bearing on two-phase flow inside a pipe, include: Should the rising discharge line be sized on flash steam velocity or the quantity of condensate?
For example, where pipes A and B 20 mm and 50 mm join, the minimum required pipe diameter is shown as 54 mm.
Risers should discharge into the top of overhead return lines. Sizing discharge lines from traps The section of pipeline downstream of the trap will carry both condensate and flash steam at the same pressure and temperature. However, in this instance, the common line rises 15 m and terminates in an overhead non-flooded condensate return main, giving the same backpressure of 1.
To avoid flash steam occurring in long return lines, hot condensate from trap discharge lines should drain into vented receivers or flash vessels where appropriatefrom where it can be pumped on to its final destination, via a flooded line at a lower temperature.
Determine the size of pipe to be used.
Clearly, the user would fit the next largest size of commercial pipe available, unless the calculated bore is close to a nominal bore size pipe.
When the trap is sized in this way, it will also cater for the start-up load.
It is sensible to consider using a slightly larger riser, which will produce a lower flash steam velocity.
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