Laserfiche WebLink
o% LEAK DETECTION <br /> TECH NOLOGIESLLC <br /> 1400 East Paseo Pavon • Tucson,AZ 85718 • Phone 520.207.4878 • FAX: 520.990.8965 <br /> www.LeakDetect.net <br /> Concept: <br /> A Proprietary Chemical Marker or Tracer is added to the containments to be tested, such as an <br /> underground storage tank (UST), or pipeline. Once the chemical tracer gas is added to the tank, product, <br /> and vapor piping primary containment any leak in the containment would carry the chemical tracer out <br /> into the surrounding secondary containment and/or soil. By utilizing test ports vapor samples can be <br /> taken from the secondary containments and/or soil and analyzed using sensitive, sophisticated analytical <br /> equipment. If the chemical tracer is detected outside of the 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 leak rate <br /> of ipsi per-hour equates to a 8760 gallon per year leak rate. Most 2" diameter pressure gauges <br /> 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 buried <br /> before backfilling or permanently covering tanks and piping. For more information review LDT "Pre- <br /> Testing Instructions for Owners and Contractors". <br /> Preparation: <br /> 1. Before testing can begin all permits and site information must be acquired by the contractor or <br /> 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 facility. <br /> b. Access ports to the secondary containment are required to be installed by the contractor <br /> 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 piping. <br /> 2. Systems check: <br /> a. Prior to starting the test an evaluation of the accessible system components is completed. <br /> LDT will scan exposed components and identifying any leaks for the contractor who will <br /> make repairs. After the completion of the repairs the contractor may leave the site. <br /> b. Once all the accessible components with leaks are repaired, LDT can begin testing the <br /> underground portion of the system. <br /> 3. Testing: <br /> a. A different chemical Tracer is introduced into the tank and piping. <br /> b. This second chemical tracer is then pumped throughout the systems product, vent, and <br /> vapor return piping as applicable. <br /> c. Each component is tested at the working pressure of the individual component. <br /> Author David Rabb 2of 3 <br />