Pulp and Paper Industry Solutions 

Engineered Equipment for Pulp and Paper Mills 

The pulp and paper industry faces some of the harshest operating conditions of any process sector. Mills run continuously, requiring equipment that can withstand high temperatures, extreme pressures, corrosive chemicals, and abrasive slurries while maintaining reliable performance. 

Since 1885, Harris Thermal has been designing and fabricating custom-engineered process equipment for pulp, paper, and wood product facilities across North America. We specialize in ASME pressure vessels, TEMA heat exchangers, evaporators, tanks, and cyclones — all built to deliver efficiency, compliance, and long service life. 

Core Processing Equipment 

Harris Thermal supports the full pulping process, from chemical digestion to recovery: 

• Digesters and Pressure Vessels – Custom-built vessels for kraft, sulfite, and chemical pulping, designed to ASME Section VIII standards. 

• Evaporators – Multi-effect and falling film evaporators for black liquor concentration and recovery. 

• Columns and Towers – Tall process columns for bleaching, washing, and chemical absorption steps. 

• Crystallizers – For efficient recovery of process chemicals and by-products. 

Heat Transfer and Energy Recovery 

Energy efficiency is essential in mill operations. Harris Thermal provides: 

• Shell and Tube Heat Exchangers – TEMA exchangers for pulp heating, condensate cooling, bleaching, and liquor recovery. 

• Condensers – Designed for high-efficiency steam recovery and emissions control. 

• Chillers – For precise cooling in pulp preparation and chemical processing. 

Separation and Washing 

Clean separation and washing processes are critical for pulp quality and mill performance: 

• Cyclones – Robust units for gas or fiber separation in pulping and recovery. 

• Washer Vessels and Tanks – Engineered tanks for pulp washing, slurry handling, and continuous service. 

Storage and Handling Solutions 

Safe storage and precise mixing are at the heart of mill operations: 

• Custom Tanks – Designed for black liquor, white liquor, bleach, and process slurry storage. 

• Mixing Tanks – For blending pulp, additives, and process chemicals in stock preparation. 

Materials and Fabrication Expertise 

Every pulp and paper application demands durability. Harris Thermal fabricates in: 

• Stainless steels for corrosion resistance 

• Duplex stainless steels for strength and chloride resistance 

• High-nickel alloys including Hastelloy, Inconel, Monel, and AL-6XN for the most aggressive chemical services 

All equipment is designed and built to ASME Code and TEMA standards, with proven capability in large-scale, high-specification equipment for leading industrial clients. 

Why Mills and EPCs Choose Harris Thermal 

• Trusted Legacy Since 1885 – over a century of custom fabrication experience 

• North American Focus – supporting pulp, paper, and wood product mills across the U.S. and Canada 

• Proven Quality – stringent welding qualifications, hydrotesting, and non-destructive examination (NDE) 

• Scalable Capability – from single vessels to complex multi-unit mill projects 

• EPC Partnerships – collaborating directly with engineers and project managers to deliver on time and on spec 

Let’s Build Together 

Harris Thermal is a proven partner for pulp and paper mills seeking reliable, engineered process equipment. From ASME digesters and black liquor evaporators to heat exchangers, cyclones, and custom tanks, our solutions are built for efficiency and long service life. 

Contact Harris Thermal today to learn how we can support your next pulp and paper project with custom-fabricated equipment designed for the toughest mill environments.