Vol.5, No1, 2005, pp. 3-17
UDC 621.791

A premature failure of boilers can be caused by simultaneous effects of a number of technological and metallurgical, design and service factors. Hence, satisfying design solution, which would ensure security and integrity in service states, can be achieved only by a proper choice of materials and a complete knowledge of the behaviour of parent material and welded joints in various operating conditions.

In the paper, the methodological approach has been presented for the state analysis of the boiler pipe system in the case of a hot-water boiler VKL-50 (steam production capacity 50 m³/h). The applied methods for testing the parent metal and welded joints and the test results are presented. The described approach enabled to assess the integrity of boiler in different operation regime.

Keywords: boiler, state analysis, welded joint, integrity assessment