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Fire And Gas Mapping

Fire and gas detector mapping study provides an objective analysis of detector layouts to support the design method and optimize the amount of detectors required to satisfy coverage targets.

Significance of undertaking F & G Mapping?

  • F&G Mapping permits the designer to position flame and gas detection devices at intervals within the facility and assess the coverage afforded by the system. This can be mechanically correlative against pre-specified targets that the system should achieve.
  • F&G Mapping provides designers with the methodology and tools to review detection coverage against pre-determined targets, and guarantee that an appropriate and optimized system is commissioned.

When it ought to be done??

  • F&G mapping study ought to be conducted during design stage to assure that the detector coverage targets square measure are met and the current F&G arrangement is effective to satisfy its supposed design performance.
  • Moreover, throughout the traditional operation, the F&G mapping study ought to be performed once major changes or modifications take place within the facilities. As a result, the study shall ensures whether or not this arrangement remains appropriate for continuous operation. If it's not the case, a collection of recommendations shall be provided and regarded to enhance the FGS performance.
  • A 3D simulation software (e.g Detect 3D) is usually used to perform this F&G mapping study taking into account the obstruction of equipment and structure. An F&G mapping study is especially supported by the comparison of detector coverage versus the coverage target.
  • Detector Geographic Coverage – is generally defined as fraction of the geometric area of a defined monitored process area that would be detected by the detector considering the defined voting arrangement (if a release were to occur) at a given geographic location.
  • Detector (Scenario) Coverage – For each defined release scenario, a part of gas dispersion is outlined. Detector Scenario Coverage is defined as fraction of the area that can be detected by the detector considering the defined voting arrangement in the area of gas dispersion.
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Approach / Methodology

A typical F&G mapping study is conducted as per the following steps:

Step 1: Identification of leak scenario;

Step 2: HC dispersion modelling using in-house spreadsheet or software;

Step 3: Evaluation of HC gas detector arrangement;

Step 4: Optimization of HC gas detector quantity and arrangement (the coverage targets to be achieved with minimum number of detectors);

Step 5: Modification of the detector arrangement as per step 4.

iFluids Engineering with our subject matter expertise ensures our CLIENTs, competent experts & resources for carrying out the step by step approach for F&G Mapping study.

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