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Danieli Centro Combustion Wins Revamp Order from Vallourec

06/14/2012 - Danieli Centro Combustion has been awarded a new order from Vallourec & Mannesmann for the revamp of a tube heat treatment line.

Danieli Centro Combustion has been awarded a new order from Vallourec & Mannesmann for the revamp of a tube heat treatment line.
The order includes the supply and installation of two new furnaces and the revamp of two existing ones geared towards expanding and optimizing current quenching and tempering processes for pipes with dimensions ranging between 114,3 and 370 mm, widths between 5 and 38 mm and with the following API grades: L80, P110, C95, VM110HC, VM125HC, VM110SS, L8013Cr, X52, X60, X65.
Production of reference pipes will be increased from approximately 44 tonnes per hour to 64 tonnes per hour thanks to a reduction in the cycle time from the current 86 seconds to the future 60 seconds.
The reheating furnace, installed upstream of the actual austenizing furnace, will result in a decrease in power consumption of more than 20% thanks to the use of thermal energy contained in the HF Furnace combustion waste gas. This waste gas will be pumped by an exhauster fan situated between the two furnaces and then injected into the PHF Combustion chamber to maximize heat exchange with the pipes and thus allowing waste gas evacuation to the stack at temperatures well below 200°C.
The new equalizing furnace situated at the end of the tempering process immediately downstream of the existing furnace (TF), will allow not only an increase in productivity but also an improvement in temperature uniformity both during and at the end of treatment.
Equalizing heat will be supplied using an important amount of waste gas which is kept in circulation and injected onto the tubes via eight fans. Maintaining the correct recirculating temperature shall be made possible through the use of eight burners positioned in the combustion chamber outside of the recirculating chamber.
This process will guarantee temperature uniformity equal to +-3° during heating and +-2.5°C on the product exiting the furnace.