The Ultrasonic Phased Array Inspection Technology Used in Tubular Joint Welds of Offshore Platform Structures
Aimed at the practical requirement of tubular joint wel ds inspection of offshore platform structures, the ultrasonic phased array inspection algorit hm for offshore platform structures is proposed in this paper, and the ultrasonic phased array inspec tion system for offshore platform structures is developed. The experiment of tubula r joint model is performed with the ultrasonic phased array inspection system for offshore platform structures, the flaws characteristic could be exactly estimated and the flaw s size could be measured through ultrasonic phased array inspection software system. Expe riment results show that the ultrasonic phased array inspection algorithm for offshor e platform structures is feasible, the ultrasonic phased array inspection system could detect fl aws in tubular joint model, the whole development trend of flaws is factually imaging by the ul trasonic phased array inspection technology of offshore platform structures.
Groundwork for Rail Flaw Detection Using Ultrasonic Phased Array Inspection
An apparent increase in the detectability of certain flaws results when the ultrasonic inspection beam was oriented off the longitudinal axis of railroad rail. Here, artificial reflectors were used to better define the extent of material “seen” by inspection beams, and determine how surface curvature might affect the inspection. Presumably, such information could be useful for suggesting optimum positioning of linear array probes in testing, and help determine the validity of simulation models of this inspection for various cases.
Comparison between Two Chemicals for Reducing Scale Formation in Reverse Osmosis Systems
In this present research was transacted with the calcium carbonate scale inhibition on the membrane surface of the reverse osmosis desalination system. Influence of changing feed solution flow rate (10-25)l/h, pH of the feed solution (6-10) on the recovery ,penetrate flow rate and total dissolved solid in (RO) system by using solution of calcium carbonate as feed solution was investigated, furthermore the effect of adding two types of scale inhibitor ,zinc chloride and polyamino polyether methylene phosphonate with difference concentration (2-8)mg/l for zinc chloride and (8-15) mg/l for polyamino polyether methylene phosphonate was calculated. The results showed that the permeate rate increases as the feed flow rate augmentation ,while it reducing with time, the total dissolved solids decreases as the feed flow rate increases while it increases with time and recovery rate decreases as the feed flow rate increases and it also decreases with time. It was concluded that the permeate rate decreases as the feed solution pH value increases and it cause high scale forming thus decrease the permeate TDS.By adding the scale inhibitor, it was found that the permeate rate and recovery rates increases as the concentration of inhibitor increases while the total dissolved solids decreases in the permeate with increasing the concentration of both inhibitors .It was discovered that Polyamino polyether methylene phosphonate more sturdy than zinc chloride as scale inhibitor for reverse osmosis desalination system in all concentrations was studied in this article.