Condensate Return Systems: How to Size Drain Lines to Traps

Condition, pressure, and quantity are three major variables considered when you need to size all condensate lines (to and from traps). And when it comes to sizing the piping to traps, know that the drain line (as well as trap) are not always of equal size to the plant outlet piping. Particularly when the plant is on temperature control, various operating pressures and flow rates may apply. But after correct sizing of the trap, the drain piping is typically of equal size to the trap inlet connection. See the best information about  boiler feed system .

Concerning the drain line's interior conditions, pressure between the plant and the trap does not decline substantially, so, the pipe has no flash steam in it, and you may size it to contain only condensate. As you size the drain line to trap, take the following into account:

1. The full-load condensing rate of the system to be drained

2. The system's start-up condensing rate: When the plant is being fired up, it can hit condensing rates as high as three times the operating load. That's the point of maximum difference between the steam and colder substance temperatures. At the same point, the in-flowing steam displaces air that must be conveyed by the discharge and drain lines as well as trap. However, these variables need to be generally taken into account when sizing the steam trap. Learn more about  water booster systems .

3. When it comes to steam mains outlet, every single drain trap has a condensate load that's usually 1% of the mains steam capacity on the basis of 50 m-interval drain points, and with excellent insulation. The trap should be sized such that it carries double the running load at the working pressure (excluding any backpressure) to match the start-up load for the majority of drain points.

4. For plants requiring temperature control, it's important to conduct a detail assessment of steam pressure and plant turndown. The designated temperature and the steam trap position do require thorough consideration too. Likewise, size the traps such that they can accommodate full and maximum load requirements. If you don't know what these requirements are, it's best to size the steam trap based on thrice the differential pressure running load. Such sizing ensures that the equipment start-up conditions are addressed, and excellent drainage is supported at minimum loads. Seek more info about air pump .

Drain lines to traps should be sized properly to ensure your condensate return system functions optimally. Hopefully, you can follow the measures above and any other relevant ones to get your plant set up correctly.