LDAR and SMART LDAR - Fugitive emissions control

LDAR and Smart LDAR programs consist of fugitive emissions monitoring and containing. These are organic and dangerous emissions originated by plants components like valves, flanges, -end-of-line, mixers/compressors/pumps seals. These elements generate growing losses due to materials deterioration. They lead to economic losses, environmental, health and safety risks.
The LDAR (Leak Detection And Repair) program helps to identify critical sources, and it leads to focused maintenance intervention. These operations result in a significant emission reduction with great advantages: money saving, safety improving and environmental protection.


Our LDAR program starts with a preliminary analysis of industrial processes, PFD, P&ID and fluid safety card, in collaboration with plant technicians. After this study, all product lines are identified, characterized and marked on every P&ID. The study provides all the useful information to identify the problem and sets out a tailored solution: device name, diameter, line code, fluid nature, fluid composition, and H350 classification. Then, we create an archive for every source, with all recorded data.

If other societies have previously realized the census and monitoring, GFE offers a data re-codifying service, in which the passage of all the data on a GFE platform is guaranteed. The archive protects all the recorded data and monitoring activities.

All the sources included in LDAR program for fugitive emissions monitoring and containment can be grouped into the following categories:
Mixers ( ring seal)
Compressors (ring seal)
Connectors ( thread type)
End line (samples, bleeding)
Pumps (ring seal)
Safety valves.

For every identified line, we realize a photographic census to organize every single source, associating them with a numeric tag on the picture, and with a device reference. The pictures are linked with all recorded sources data ( diameter, fluids composition and characterization, stage, etc..) to create a complete sources archive.

Tag to identify source - LDAR PROGRAM

After monitoring, identifying, characterizing and organizing all the sources, our specialized technicians realize the fugitive emissions measurement using portable devices. Then, they identify divergent sources, which are out of range.

Accessible sources

Inorganic gases monitoring such as H2, SO2: portable TCD (Micro Thermal Conductivity Detector) with 0-800.000 ppmv measure range.

Strumento TCD - Emissioni Fuggitive
HAP monitoring (High Hazardous Pollution) such as NH3, H2S, HF: portable PID (Photo Ionization Detector), with 0-20.000 ppmv standard range.
Strumento PID - Emissioni Fuggitive
VOC monitoring ( volatile organic compound): portable FID (Flame Ionization Detector), with 0-100.000 ppmv measure range.
Strumento FID - Emissioni Fuggitive
Non accessible sources

If some sources can’t be reached with mobile devices, or in the case of SMART LDAR program, it is possible to use GF320 gas finder (optical gas imaging).

During the monitoring phase, out of range sources are identified. These sources present higher emissions than the leak definition (usually 10.000 ppmv).
The monitoring operator realizes an onsite labeling using signs tags.

Monitoring frequencies, intervention times and recording

The law dictates to intervene on out of range sources, with a precise timing:

  • Within five days for non-cancerous sources
  • Immediately for cancerous sources

Maintenance activities must be recorded, followed by these data:

  • Maintenance start date
  • Maintenance end date
  • Work shift
  • Maintenance type
  • Post-maintenance monitoring

Divergent sources signal

Respecting law timing (ISPRA DOCUMENT N. 18712 OF 01.06.2011- ATTACHED H_ TAB 2), our technicians immediately send a photographic report with all the out of range sources information found.

Current norms and regulations

Our programs agree with the following law ruling:
EPA 453/R-95-017 “Protocol for Equipment Leak Emission Estimates.”
UNI EN 15446 “Measurement of fugitive emission of vapors generating from equipment and piping leaks.”
EPA 6560-50P “Alternative work practice to detect leaks from equipment.”
CONCAWE Report n. 6-2015 “ Techniques for identifying and quantifying fugitive emissions – results of comparative field studies.”
EPA – A Best Practices Guide “ Leak Detection and Repair ”
NTA 8399_2015 “Air quality – Guidelines for detection of diffuse VOC emissions with optical gas imaging.”

Our LDAR and Smart LDAR program has been developed thanks to more than 40 years of on field experience.

Simultaneous Inspection, micro repairing, programmed operations and re-monitoring

According to the timing established by the current norms, GFE offers an inspection service and, in case it’s possible to operate with a start-up plant, the FIRST OPERATION (micro repairs) and simultaneous re-monitoring. These two types of intervention allow to remove the 80% of losses during the monitoring campaigns.
If this isn’t possible, or if micro-repairs produce a negative result, an operation with a start- up or stop plant is provided.


Quality control on maintenance activities: loss monitoring and concurrent maintenance operation guarantee a high success level (loss repair).

GFE organizes information flux and ensures a punctual respect of the intervention timing required by ISPRA Document, Attached H.
I: LDAR Management software is always updated with a maintenance archive. An excel dedicated file is available for consulting and download. 

After every intervention, you will obtain a personalized report which can be presented to control corporations. It will contain every census, monitoring and maintenance data.
You can verify every result: fugitive emissions pre and post maintenance calculation, as well as their abatement, can be realized with all the calculus methods internationally recognized (EPA 453/R-95-017; UNI EN 15446; CONCAWE report n.6-2015, etc.)

I: report custom: reports are tailored to your needs, to offer you a complete document with all the information you require.


To simplify the management and to always keep you informed about the interventions, we’ve developed GFE SOFTWARE 1.4.
This software permits an intuitive LDAR program management, and it facilitates to interact with all the data and processes involved;. In this way, we give you a powerful instrument for internal and external audit (control corporations).
Quick sources research: A punctual research of every source using different filters can easily be accomplished.
Archive: it’s possible to visualize and extract monitoring and maintenance operations archive.
Critical sources: a dedicated window to have a quick critical sources research.
Emissions trend: you can consult every emissions trend
Pdf an excel data export: you can export the data you need in every moment, in pdf and excel format.

Software custom LDAR

We want to offer you the best possible result. For this reason, we follow the EPA procedures guide, in addition to current norms.
You can find it at following link:


  • SAVINGS: an 80% product waste decrease after a year with this program. Maintenance costs are also optimized.
  • SAFETY: Accident risks decrease due to the fire and explosion risks decrease. It also guarantees a healthier work place.
  • ENVIRONMENT: cancerous substance emissions in atmosphere decrease, air quality improvement in plant, long term environmental safety.

CCAC Oil and Gas Methane Partnership (OGMP)

Quantification and monitoring of methane emissions from core emissions sources service.
Information in the following slides slides following (Click to enlarge):


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