bids are invited for servicing overhauling and maintenance of swas field equipments and wet panel changing spindle gland of root valves , cleaning and blowing by air of impulse pipelines , attending of leakage from steam water air lines , replacement of pressure temperature gauges and switches , servicing testing and calibration of pressure gauges , 2x4 ton chiller unit overhauling , servicing testing and calibration of temperature gauges , servicing testing calibration of temperature switches , cleaning spray painting repair of swas station , replacement changing of ss root valves s le relief valve , servicing of valve 10mm size high pressure low pressure , replacement of valves 10mm size high pressure low pressure , removal choking replacement of impulse line , servicing of s ling cooler dhx18sco , servicing of cooler dhx12 sco , servicing of cooler dhx06 sco , mechanical fabrication , overhauling reconditioning of 3ton ac unit