The existing troublesome problems on title conden sate pumps are as follows: (1) the fastening bolts at movable flange joint of connecting pipe are easy to be brocken; (2) the packing shaft sleeves are easy to be worn-out; (3) large amount of water-leakage from gland packing

etc.. For these problems

retrofit of related parts has been carried out: (1) the movable connecting pipe has been changed into a fixed one; (2) single end-face container type mechanical seal manufactured from UK has been installed. After retrofitting

the said problems are thoroughly solved.