Based on the successful experience of multi-orifice technical retrofit for measuring water-level in the drum of boiler no.1 in Huaneng Pingliang Power Generation Co Ltd

the principle for measuring water-level in boiler drum and the method for enhancing the precision of measurement have been analysed.It isn't necessary to bore holes on the wall of drum

the measurement of each water-level indicater can not mutually interfered

decreasing the deviation of measurement

enhancing the reliability of protection control for water-level in the boiler drum.