EnviroTRACE in Action

Case Studies

Power Plant Leak

EnviroSCAN

Challenge:

A closed-loop glycol cooling system inside a power plant was losing 4.5L of coolant per hour. We needed to locate the leak accurately in order to minimize the amount of concrete being removed by the client to conduct repairs.

Constraints

The concrete floor thickness ranged from 1 to 6 feet in depth, and the lines were located inside the live plant. The lines were constructed of high-density poly piping, making line locating impossible.

Solution:

In order to reduce the impact on the concrete floor, the test was done in stages. We set sampling ports at the pipe joints and elbows, identified through the use of ‘As-Built’ drawings. Sampling was conducted at set intervals (24 hour/72 hour/14 day). At the 12 hour sample a leak was detected, and subsequent samplings also verified results.

Result

At the 12 hour sample a leak was detected, and subsequent samples also verified results. We contacted the client and disclosed the exact location of the leak. The client was then able to repair the small section of the coolant system with minimal disruption to operations.

Large Diameter Tank Leak

FlowTRACE

Challenge

A 135-foot wide and 51-foot tall tank had fluid leaking from its base.

Constraints

The tank was imperative to plant operations and could not be taken off-line.

Solution

In order to reduce the impact on production, we set sampling ports under the floor of the tank in a designed array. Flow-through was calculated, and a QTA (Quantifiable Tagging Agent) was injected into the 24 inch inlet pipe upstream of the tank. Sampling was done at 12/24/72 hour intervals, followed by 7 and 10-day intervals.

Result

A leak was detected at the 24-hour mark, with subsequent sampling verifying the initial result. By triangulating the sample port results, the leak location area was determined. Three additional small leaks were found in the suspect area, and one intermittent leak was discovered on the 7 and 10-day data samples.

Multiple Pipeline Leak

FlowTRACE

Challenge

A sump tank located at a facility had multiple underground inlet lines. A leak surfaced on location and the client needed to test and prove all lines were intact prior to recommissioning the facility.

Constraints

Not all inlet lines were owned by the client – a third-party line drained into the sump tank from an adjacent facility. All the lines had to be tested and proven tight prior to putting facility back to normal operations. Due to harsh weather conditions, several sample ports were covered with a thick layer of ice.

Solution

The sump tank was exposed to determine the orientation of a third-party line. We dosed the stagnant drain lines with a QTA (Quantifiable Tagging Agent), installed required monitoring wells, and sampled for the presence of QTA to determine if any line sections were leaking.

Results

Sampling was conducted on all drain lines owned by the client resulting in a pass certification. The third-party line was determined to be the cause of the leak, and the client’s site returned to normal operations.

Stray Gas Leak Detection

EnviroSCAN

Challenge

Air monitor alarms continued to be triggered in a process building, indicating dangerously-high concentrations of H2S. Numerous attempts to locate the source with hand-held devices were unsuccessful.

Constraints

Given a complex system inside the building, piping was obstructive and made access to all areas difficult. Process vessels extended to 20 feet in height, hampering the use of handheld sniffers and exposing staff to potential danger.

Solution

GasFindIR cameras were used to locate the leaks from a safe distance. These cameras used a telephoto lens at a distance, finding and recording a <.8gr/hr leak.

Result

Stray gas emissions were seen at a flange near the top of a vessel and in the process piping. A post-repair scan showed the previous leak was repaired, but two new emission leaks were created when the piping was taken apart.

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