The cause resulting in weld joint fracture on comb-shaped sealing structure of wall-penetrating pipe on the ceiling of reheater for 2008 t/h boiler have been analyzed

it is believed that the main causes leading to weld joint fracture are improper structure of the ceiling's sealing plate

and poor weld quality of the said plate

etc..For these

structural retrofit

such as additionally installing casing pipe in the transition section on sealing plate

and outside the rear-platen reheater and final-stage reheater

and measures for enhancing weld quality

etc.

have been put forward.After implementation

fracture has not occurred again at these locations.