Inspection And Replacement Of Pipe With Urea Factory NH Risk Based Inspection Method

With the RBI, could be risk based inspection program is happening. In this stage, POF and COF are expressed qualitatively low and high. POF COF low x low = low risk, the risk of this equipment with suitable corrective maintenance. POF COF high x low = high risk, then appropriate corrective maintenance applied. POF COF high x high = high risk, it must be done to determine the detailed analysis of the inspection plan or mitigation action. Equipment with high risk were brought to stage II for detailed analysis. Suppose the pipe with a new coating. POF COF low x high = high risk. If the area of this coating cover off the POF were getting up so the risk was high.

There are three main manufacturers of utility plants, ammonia, and urea.Objek research in writing this final task is to pipe NH in urea plant that is connected directly to the reactor section. Inspection activities should be done on this pipe to monitor the thickness of the pipe. To do an analysis to provide an effective proposal is supported by an acceptable reason and has a scientific explanation.
Has determined that the minimum allowable thickness is 0.504 "and the probability of failure of the maximum permitted is 0.01%. Both of these conditions represent a pipe failure at NH. Risk control is done by controlling the maximum probability of failure. While eta parameter indicates the average thickness of the pipe which must be controlled in NH until the lowest limit is called the "critical eta". At this time there will be replacement of pipes NH. Further examination of the determination interval composed of the rest of the available age until the end of the age limit.
Weibull distribution obtained with a beta value that represents. This must be controlled must not exceed the maximum permitted limit. The selection of different beta parameters give different effects on the critical value and the final delimitation of age.
With some consideration the schedule of the proposed examination performed at 1 / 2 of remaining life that is in year 27, 33, 36, and 38.