bids are invited for custom bid for services - lumpsum amount including gst for eddy current testing of non-ferrous/stainless steel exchanger tubes by conventional eddy current testing technique as applicable, as per relevant astm standard along with mobilization/demobil.. , custom bid for services - lumpsum amount including gst for eddy current testing of ferrous exchangers tubes by remote field eddy current testing technique as per relevant astm standard along with mobilization/demobilization cost , custom bid for services - lumpsum amount including gst for providing services for helium leak detection survey using helium mass spectrometer (detector probe technique) in exchangers/coolers (102-ee-402a/b) as per the instructions of engineer-in-char.. , custom bid for services - lumpsum amount including gst for providing services for helium leak detection survey using helium mass spectrometer (detector probe technique) in surface condensers system of steam turbine of 09-25 mw, as per the instruction..