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LEAK DETECTION <br /> 1 E C H N 0 L 0 6 1 E S LLC <br /> Exclusive Providers for MDleak® and PHDleak® Technologies <br /> 1400 East Paseo Pavon • Tucson,AZ 85718 • Phone 855-255-5325 • FAX: 520.990.8965 <br /> Sales@LeakDetect.net • www.LeakDetect.net <br /> Concept: <br /> A Proprietary Chemical Marker or Tracer is added to the containment/s to be tested, such as an <br /> underground storage tank (UST), or pipeline. Once the chemical tracer gas is added to the tank, <br /> product, and vapor piping primary containment any leak in the containment would carry the <br /> chemical tracer out into the surrounding secondary containment and/or soil. By utilizing test <br /> ports vapor samples can be taken from the secondary containments and/or soil and analyzed using <br /> sensitive, sophisticated analytical equipment. If the chemical tracer is detected outside of the <br /> containment, a leak may exist. <br /> Pretesting: <br /> ELD testing has a greater sensitivity than the federal standard which utilizes conventional testing <br /> methods. For example, a 60 psi pneumatic pressure test of a 150 foot 1.5" pipeline with a <br /> leak rate of 1psi per-hour equates to a 8760 gallon per year leak rate. Most 2" diameter <br /> pressure gauges would not detect this leak rate in one hour. <br /> It is highly recommended that a pretest or pre-screening be completed on the components to be <br /> buried before backfilling or permanently covering tanks and piping. For more information review <br /> LDT "Pre-Testing Instructions for Owners and Contractors". <br /> Preparation: <br /> 1. Before testing can begin all permits and site information must be acquired by the <br /> contractor or owner. LDT will supply all documents required as requested. <br /> Setup: <br /> 1. During the setup portion of the test a contractor is required to be present onsite. <br /> a. The contractor is required to be prepared to repair any accessible component at the <br /> facility. <br /> b. Access ports to the secondary containment are required to be installed by the <br /> contractor prior to LDT arriving at the site. <br /> c. Access to the top of the vent risers, tank sumps and UDC's may be required. <br /> Procedure: <br /> 1. A Proprietary Chemical Tracer is added to the airspace within the primary tank, and <br /> piping. <br /> 2. Systems check: <br /> a. Prior to starting the test an evaluation of the accessible system components is <br /> completed. LDT will scan exposed components and identifying any leaks for the <br /> contractor who will make repairs. After the completion of the repairs the contractor <br /> may leave the site. <br /> Author David Rabb 2of 3 <br />