To avoid the direct contact of hot steam through the steam pipe a pigtail shaped curve is made at the impulse line 15 to the pressure gauge 8. where condensed steam (water) will accumulate and act as a liquid barrier to prevent hot steam from reaching the pressure instrument.
The same effect is created when we made a water trap in the line. Water trap is a low spot in the impulse line.
When siphons are installed, it should be filled with water or any other suitable separating liquid.
- Used to protect the pressure gauge from the effect of hot pressure media, temperature above 65°C
- Used to reduce rapid pressure rise, which can affect the gauge.
- Used at the inlet and outlet steam flow measurement of boiler
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