![]() Defect depth is estimated only by signal amplitude (signal amplitude and phase values if defect is ID in nature) Difficulty of interpretation if different defect types are present (OD pitting and baffle cutting) areas of inadequate saturation near and under the tube sheets (up to 0.500” from tube sheet for Carbon Steel tubing) areas of inadequate saturation or false indication near and under support plates or tube sheets (up to 0.500” from support plates or tube sheet for Sea-Cure, SS-400 series, Duplex S/S) areas of inadequate saturation (up to 1.250” from the ends of a tube) wall thickness (depending on OD and magnetic permeability of inspected tube) Currently, for carbon steel tubing:ġ.000” OD – up to 0.120” Wall (0.134” for fin-fan tubing) Report includes color-coded tube sheet maps so that problem areas can be immediately identified Preliminary report is issued immediately after testing is completed Cleanliness requirements are less stringent than for IRIS (providing that 75 – 85% Fill Factor Probe can propagate through the tubes) If defect type is known in advance, defect sizing is more accurate the defect areas can be detected regardless Multiple frequencies allow mixing capability to be utilized to suppress unwanted signals and / or noise Cracks (circumferential and longitudinal) can be detected Hand pull average speed (30 – 50 tubes per hour) High speed air assist technique (60 – 100 tubes per hour) Defects near and / or under support plates can be detected (for Carbon Steel tubing only) Suitable for internal / external corrosion detection (can differentiate between ID & OD defects) Suitable for fin-fan (air cooler) tubing
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |