Design and servo control of a leak tightness machine working based on hydrostatic pressure aging method

Abstract

The leakage problem, which occurs due to the high hydrostatic pressure values of the fluid inside the pipes, is a serious issue in most of the pipeline systems. Therefore, the leak tightness test is required in different standards for verification of almost every kind of pipes used in both academic researches and industrial applications. The behavior of the hydrostatic pressure parameter in the test pipe has to be as smooth as possible during the leak tightness test. The conventional control loops of the servo mechanisms used for pumping the test fluid into the test pipe are weak to provide the minimum overshoot, the rise time and the steady-state error. In this situation, hydrostatic pressure tests are not capable of giving meaningful results. In this study, a leak tightness test machine working with a servo control loop to provide the optimum hydrostatic pressure pattern is designed. The efficacy of the designed leak tightness test machine and proposed optimized servo control loop have been shown with both simulation and experimental results.

Mechanical Properties and Leak-Tightness of Polymeric Pipe Adhesive Joints

“…Often, such installations also include the hybrid joints using adhesive, mechanical (e.g., threaded joints), welded and other types of the joints (e.g., soldered). Various types of pipe constructions (with fabricated joints), such as drainage pipes or pipelines, require leakage testing (both water and air, and also others) prior to operation [6,11,[13][14][15]. Yalçin et al [13] pointed out the need to undertake the issues of the pipe tightness control, due to the leakage problem in such systems.…”

“…Various types of pipe constructions (with fabricated joints), such as drainage pipes or pipelines, require leakage testing (both water and air, and also others) prior to operation [6,11,[13][14][15]. Yalçin et al [13] pointed out the need to undertake the issues of the pipe tightness control, due to the leakage problem in such systems. An important and at the same time potentially sensitive area is the pipe joints, in this case presented in this paper by means of the bonding.…”

“…It was observed that the longer the seasoning time of the adhesive joint samples was, the more negative effects on the adhesive joints (decreased strength regardless of the adhesive type or the material). Some publications have also addressed the problem of assessing the tightness of the pipes and the pipe joints using both water and air tests [6,7,13]. Jensen and Agnone [7] presented a leak detection method for metal or plastic piping systems and a variety of joint types.…”

Linear matrix inequality-based model matching H2 output feedback control of a new leak tightness machine working based on hydrostatic pressure aging method

“…Yalçın et al (2016) have designed a leak tightness machine that can reach 700 bar during the test. A servo motor coupled with a rack and pinion mechanism limits the maximum pressure value around 700 bar .…”