Tenova LOI Italimpianti supplied a heat-treatment furnace to Vallourec & Mannesmann Tubes Deutschland. The hardening furnace has a nominal capacity of 50 tons/hour of pipes with different diameters and thicknesses heated up to approximately 1742°F (950°C). The combustion system has been modernized by installing low-NOx, high-speed burners, designed for running with natural gas and preheated air, above and below the charge.

Tenova LOI Italimpianti also supplied a pit furnace to Vallourec & Mannesmann Tubes Deutschland. The furnace has a load capacity of 220 tons of round pieces, having different steel qualities, heated up to 2408°F (1320°C). It is equipped with low-NOx, high-speed burners designed for running with natural gas and controlled in on/off sequential mode.