API PUBL 346-1998

$26.65

Results of Range-Finding Testing of Leak Detection and Leak Location Technologies for Underground Pipelines

Published By	Publication Date	Number of Pages
API	1998	239

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Description

This study reviewed the leak detection and leak location methods for pressurized underground piping. The review selected candidate methods for testing underground piping of diameters of 6 to 18 inches and lengths of 250 feet to about 2 miles. Such underground piping is commonly found at airports, refineries, and fuel terminals. Methods that appeared promising were further reviewed, and four technologies were selected for field demonstration in range-finding tests. The four technologies were constant-pressure volumetric testing, pressure-decay testing, chemical tracer testing, and acoustic emission testing. Range- finding tests were conducted at an operating facility, using pipeline sections of different volumes. The methods were tested on tight lines, lines with induced leaks, and one line with an operational leak. The approximate size of a leak that each method could detect was estimated. Methods that could locate leaks were used to identify the operational leak, which was confirmed by excavation and repair.

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