Spirax-Sarco 51313 Trap

The Spirax Sarco 51313 is a heavy-duty FT-15 Float and Thermostatic Steam Trap engineered for high-capacity condensate removal in low-pressure steam systems. Featuring a 1-1/4 inch NPT connection, this mechanical steam trap utilizes a robust stainless steel float mechanism and a balanced pressure thermostatic air vent to ensure immediate discharge of air and non-condensable gases during start-up. Designed for a maximum operating pressure of 15 psig, the FT-15 series maintains a continuous condensate discharge rate, making it an ideal choice for heat exchangers, unit heaters, and steam coils where gravity drainage is essential. The horizontal flow alignment and durable cast iron body construction facilitate streamlined steam trap installation and maintenance for commercial boiler rooms and industrial process lines. By preventing condensate backup, this unit optimizes thermal efficiency and protects downstream piping from water hammer and corrosion.

Key Technical Benefits

• Integral Air Vent: The thermostatic air vent allows for rapid air removal during system start-up, preventing air binding.
• Continuous Discharge: Modulating float mechanism ensures instantaneous condensate removal under varying loads.
• Rugged Build: Cast iron body with all stainless steel internal components provides resistance to erosion and water hammer.
• Serviceability: Inline design allows for simplified inspection and internal component replacement without disturbing piping.
• High Flow Capacity: Specifically sized for 1-1/4" steam lines requiring efficient drainage of large condensate volumes at 15 psi.

Common Questions

How do I troubleshoot a Spirax Sarco FT-15 trap blowing live steam?
Usually, this indicates dirt or scale is preventing the valve head from seating. Inspect the stainless steel seat and valve for debris or pitting. If the float is damaged or "waterlogged," the trap may fail closed; if the seat is worn, it will fail open.

Can the FT-15 be installed in a vertical orientation?
No, Float and Thermostatic traps like the 51313 must be installed horizontally with the flow in the direction of the arrow to ensure the float mechanism operates correctly via gravity.

Is this trap suitable for high-pressure main drips?
The Spirax Sarco 51313 is strictly rated for low-pressure steam up to 15 psig. For higher pressure applications, you must select the appropriate FT series rated for your specific operating pressure (e.g., FT-30 or FT-125).

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.