Page 5 - Bosch The basis for production excellence

Quality, precision and a sense of responsibility | 5

For Bosch’s industrial boilers (formerly Loos) the
construction principle has been developed further and
the use of stud bolts has been discontinued. The flame
tube is fixed at both ends of the boiler body and occur-
ring tensions can be passed on via diagonal stays
(corner anchors). To prevent additional radiation of
heat, the boiler’s inspection door is filled in with a
special Bosch composite material with extremely high
insulation qualities. It is designed to be maintenance-
free during the entire service life when commissioned
and operated correctly. This UL-S design method has
proved itself for more than 60 years in more than
80,000 boiler systems. Some of the first boilers of this
kind from the early 1950s are verifiably still in daily In contrast to tie rods, diagonal stays enable uniform tension
operation today. distribution and a long service life.

Proper welding of flame tube and smoke tube

for more safety and stability

The connections between flame and smoke tubes and Burner passages however are made without water
the boiler’s ends are amongst the most important parts cooling in order to increase the boiler’s durability.
in a high-pressure boiler. These connections must resist Complicated and costly repairs including a complete
high tensions and temperatures. This is why for Bosch hydraulic pressure test are thus prevented. Thanks to
boilers the smoke tubes are welded in by modern robots Bosch’s special insulation concept in the burner pas-
and the flame tubes by semi-automatic welding plants. sage, heat emission losses and heat input of our indus-
Semi-automatic or fully automatic welding processes trial boilers can be minimised. Furthermore, it
enable homogeneous and especially robust connections. increases the robustness and maintainability of the
In addition, special grooves are used to enable better boilers because the insulation material is designed for
cooling of thermally highly stressed weldseams. Partic- the entire service life of the boiler when commissioned
ularly for thicker sheet metal this provides excellent and operated correctly.
cooling even in high load condition.