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Why a Siphon Tube Is Used in a Pressure Gauge❓



Why a Siphon Tube Is Used in a Pressure Gauge❓
???? In industrial settings where pressure measurement involves high-temperature fluids—especially steam—siphon tubes play a critical role in protecting pressure gauges. Though they may seem like a simple coil of pipe, their purpose is essential for ensuring both accuracy and longevity of the instrumentation.
???? What Is a Siphon Tube?
A siphon tube is a curved or coiled metal tube installed between a pressure gauge and a pipeline carrying hot vapor (usually steam). It’s commonly seen in the form of a pigtail (circular coil) or U-shape, made from materials like stainless steel, brass, or carbon steel.
???? Purpose of a Siphon Tube in Pressure Gauges
1. Protects the Gauge from High Temperature
Steam, especially in boiler systems, can reach very high temperatures. If this steam enters the pressure gauge directly, it can damage internal components, affect readings, or even cause gauge failure.
✅ Siphon tubes act as thermal barriers, allowing steam to condense into water before reaching the gauge.
2. Creates a Water Seal
The coiled portion of the siphon tube holds a small amount of water (condensate), which forms a protective liquid barrier between the hot steam and the gauge.
This trapped water absorbs the heat and prevents direct contact of steam with the sensitive parts of the gauge.
3. Ensures Accurate Readings
Exposing a gauge directly to high-temperature steam can alter pressure readings due to thermal expansion or deformation of parts.
✅ The siphon ensures temperature stabilization, helping the gauge maintain accurate pressure measurements over time.
4. Increases Lifespan of the Gauge
Constant exposure to high heat and pressure can shorten the operational life of a pressure gauge.
✅ Siphon tubes minimize thermal stress, extending the life of the gauge and reducing maintenance and replacement costs.
???? Where Are Siphon Tubes Used?
◾ Steam boilers and turbines
◾ Power plants
◾ Refineries and chemical processing units
◾ Heating systems
◾ High-pressure steam pipelines
???? Types of Siphon Tubes
1️⃣ Pigtail Siphon – Circular coil, ideal for vertical mounting.
2️⃣ U-type Siphon – U-shaped curve, suitable for horizontal mounting.
3️⃣ Straight Siphon with Loop – Used in tight spaces or where custom geometry is needed.
Each type serves the same purpose but is selected based on orientation, pressure rating, and space constraints.