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Boiler Tube and Digester Coating Services
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The Pulp and Paper Industry Continues to experience rapid metal wear in their pressure vessels from abrasion, erosion, fretting, cavitation, and oxidation/corrosion mechanisms as a result from various acid and caustic cooking environments. These types of service damage decrease component life, lower equipment reliability and has a negative impact on maintenance budgets and outage durations. If unprotected, excessive reductions in wall thickness can eventually lead to cracking and component failure. Use of electric wire arc spray coatings to prevent corrosion/erosion damage in cooking digester environments can be a cost effective alternative to component replacement or extensive weld overlay, which has proven to have a real potential for thermal distortion of the base metal.
The Arc Spray Process
The Twin Wire Arc Spray process is an automated system for depositing a molten, high performance metal coating on the base metal of pressure vessels, boiler firesides, fan blades, piping, and turbine parts subject to corrosion and erosion. The inconel materials, with high nickel, high chrome matrix content are selected not only for corrosion and erosion properties, but also for thermal expansion, matching it to carbon steel. The resulting coating provides and excellent barrier layer to protect the surface from further deterioration. The table below compares characteristics of the Twin Wire Electric Wire Arc spray process with other field repair technologies including flame spray coatings and weld overlay. The Twin Wire Arc spray process exhibits superior mechanical bond strength and coating density than flame spray and unlike weld overlay has no heat affected zone (HAZ).
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We are prepared to assist you with on-site inspections and a full range of services:
Parts
- Designed and fabricated in accordance to ASME Section VIII Div. 1 and Section 1.
- Speciality parts include Digester attachements, alloy nozzles and fittings, digester dome and heads of 2205SS.
- Cones and Heads
- Digester Inserts and Sleeves
- Alloy Fittings
- ASME Quick Opening Closures
- Spool pieces
- Attachments
- Special Designs and Alloys
Testing and Examination
- Testing and Examinations are made in accordance to ASNTC-1A.
- Liquid Dye Penetrate
- Magnetic Particle
- Thickness Reading and mapping
- Magnetic lift off Reading and mapping
- Out of round
Design and Fabrication of Boiler Components
- P-91 Welding
- ASME Section 1, Boilers
- B31.1 Power Piping
- Water walls
- Tube sheets
- Headers
- Spool Pieces
- Deareators
- Feed Water Systems
- Alloys
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