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LDAR – Leak Detection And Repair
The primary source of emissions of volatile organic compounds (VOC) from petroleum refineries and chemical manufacturing facilities are leaking equipment, such as valves, pumps, compressors and connectors. VOCs can pose a threat to workers and formulate ground-level ozone, a major component of smog. This secondary pollutant can cause or aggravate respiratory disease, particularly in children. In addition to workers at a facility, the surrounding community can be affected by long-term exposure to toxic air pollutants as a result of leaking equipment. Leaking VOCs will also contribute to higher running costs due to the loss of expensive products.
The US EPA specifies EPA Method 21 to detect VOC leaks from process equipment using portable VOC detection instrumentation. Inspekta Lab employs can help your company design and implement an effective LDAR program, allowing you to comply with EPA Method 21, local regulations and EN 15446.
Our monitoring working methodology
- Project preparation: planning, gathering unit information and structure, mapping streams on P&ID’s, database and LDAR module software setup.
- On-site activities: identification and monitoring of all potential leak sources, labelling of all leaking equipment with leak tag and first repair round.
- Data management and reporting: monitoring data input in LDAR database, data verification, automatic repair orders generation.
- Project handover: analysis & maintenance recommendations for the coming years, project data and reports, as well as digital project presentation.
PWHT – Post Weld Heat Treatment
Inspekta Lab offers post weld heat treatment (PWHT) to improve weld microstructure and reduce residual stresses developed during welding.
Inspekta Lab specialises in performing PWHT for the steel and metal fabrication industries including the construction of pressure vessels, pressure piping, storage tanks, buildings, bridges, offshore platforms, power plants, oil and gas refineries, and petrochemical plants.
There is often a mandatory requirement for PWHT due to compliance with welding codes and specifications on certain materials including but not limited to carbon steels, stainless/high alloy steels and work hardened steels. There may also be PWHT requirements based on the wall thickness of the parts being welded together.
PWHT reduces or redistributes the residual stress introduced by the welding process with a technique that involves heating, soaking, and cooling the weldment/machined surface to controlled temperatures. This improves the properties of the weldment/machined surface. Other benefits of PWHT include:
- Improved ductility of the material
- Improved or reduced hardness
- Reduced risk of brittle fracture
- Relaxed thermal stress
- Removal of diffusible hydrogen
- Improved metallurgical structure
Inspekta Lab can perform PWHT at both our own premises and at our customers’ sites. Inspekta Lab can carry out PWHT at our customers’ sites at any offshore and onshore location utilizing our portable equipment. Our team of highly skilled and trained PWHT technicians ensures that all weldments/machined surfaces brought in for treatment will meet the specified welding code requirements and be fit for purpose.
By partnering with Inspekta Lab for PWHT, you will also benefit from our global services and experience. We can provide the non-destructive inspections that are normally required after PWHT is completed - including hardness testing, magnetic particle inspection and after stress radiography. Our metallurgical laboratories and experienced engineers with metallurgical backgrounds add to the wealth of knowledge and expertise needed to execute any critical PWHT while providing Total Quality Assurance.