Lance Tube

A lance tube is the critical tubular component within soot blower systems that extends into boiler flue gas passages to deliver high-pressure steam, air, or water for removing ash, soot, and deposits from heat exchange surfaces. It serves as the conduit and delivery mechanism for the cleaning medium. The lance tube is connected to the soot blower's rotating mechanism and cleaning medium supply. During operation, it extends into the boiler, rotates to cover specific areas, and delivers high-pressure cleaning medium through nozzles at its tip to dislodge deposits from heat exchange surfaces. Materials on file include stainless steel and heat-resistant alloy steel. Standard parameters include outer diameter from 60.3 to 114.3 mm (ISO 4200), wall thickness from 4.0 to 8.8 mm (ISO 4200), length from 3000 to 12000 mm (custom up to 12 m), operating temperature from -20 to 200 °C, surface roughness Ra 3.2 to 6.3 µm (ISO 4287), straightness ≤1.5 mm/m (ISO 1101), material grade SA-213 T22 (ASTM A213), and weight from 15 to 60 kg/m. These values are directory references and must be verified for the specific model and application. The lance tube is a component used in soot blowers for boiler maintenance. Selection requires consideration of boiler dimensions, flue gas temperature, deposit characteristics, and cleaning medium type. Interfaces include the soot blower rotating mechanism, medium supply piping, and nozzle attachments. Verification questions include confirming material grade, dimensional tolerances, and compliance with applicable standards. Maintenance signals include wear, corrosion, or deformation affecting straightness or nozzle alignment. Failure boundaries include material fatigue, thermal stress, or pressure limits. Always verify model-specific values and standards with the legal manufacturer or supplier.

The lance tube is connected to a soot blower's rotating mechanism and cleaning medium supply. During operation, it extends into the boiler, rotates to cover specific areas, and delivers high-pressure cleaning medium through nozzles at its tip to dislodge deposits from heat exchange surfaces. The tube must withstand high temperatures and pressures while maintaining straightness for proper insertion and retraction. The cleaning medium, typically steam, air, or water, is directed at deposits to remove them without damaging boiler tubes. The lance tube's design and material selection are critical for reliable operation and longevity.