FABRICATORS AND MANUFACTURERS

Welcome to IRISNDT's QUALITY NONDESTRUCTIVE TESTING AND MATERIALS ENGINEERING SERVICES.

The inspection of as-fabricated piping and pressure vessels has been at the core of our company's services since its creation in 1953. Then, the industry required us to perform radiography using isotopes and film. Today, while radiography continues to be the staple technology for as-fabricated vessels, we also inspect piping and pressure vessels using time of flight diffraction (ASME Code Case 2235). As well, we perform computed radiography which based on the ASME Code Case 2476 can be used in lieu of traditional radiography.

Our showcase of services to this industry are:

ASME PRESSURE VESSEL AND PIPING AS-BUILT INSPECTIONS

The inspection of as-fabricated piping and pressure vessels has been at the core of our company's services since its creation in 1953. Then, the industry required us to perform radiography using isotopes and film. Today, while radiography continues to be the staple technology for as-fabricated vessels, we also inspect piping and pressure vessels using time of flight diffraction (ASME Code Case 2235). As well, we perform computed radiography which based on the ASME Code Case 2476 can be used in lieu of traditional radiography.

Inspecting nondestructively as-fabricated pressure vessels and piping built to meet ASME requirements requires skill, and an extensive quality assurance and safety program. In essence, the local pressure vessel safety authority must approve IRISNDT personnel as the fabricator's NDT Level III personnel. IRISNDT fulfills this role for over 50 fabrication shops within Alberta.

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CASTING AND FORGINGS INSPECTION

Cast and forged parts are often inspected after manufacturing to verify that they:

  • Are free of significant porosity, inclusions and internal flaws.

  • Are free of non-fused and/or cracked areas.

  • Meet the chemical composition specified.

  • Meet the mechanical properties specified.

IRISNDT personnel inspect castings and forged parts used as valve and pump parts, pump casings, and fittings in process equipment, aerospace, naval and nuclear components. The main inspections that we perform are:

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MODULAR FABRICATION - INSPECTIONS

Many of our more recent plant construction projects have required inspection of modules. This construction maximizes the inspection required at modular fabrication yards and minimizes the field welding and field radiography required during installation. In the field, our services must be available at all times to insure that critical examinations such as those of root passes and tie-ins are timely. Material verification tests and their documentation are also critical in modular fabrication.

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NACE SOUR SERVICE MATERIAL TESTING

The fabricators and manufacturers of oil and gas production components used in H2S containing environments supply equipment in accordance with the international standard NACE MR0175/ISO 15156. To verify compliance with the specified hardness requirements and chemical composition requirements, IRISNDT performs:

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HEAVY WALL VESSEL INSPECTION

The welds of heavy wall vessels are often inspected with Time Of Flight Diffraction (TOFD) or phased array instead of radiography. This is due to:

  • Heavy wall vessels being susceptible to having in-bound cracks and lack of fusion (depending on the weld configuration).


  • TOFD or phased array being well suited to identify these flaws.


  • Radiography being less adept than TOFD in identifying cracks and non-fused areas with an orientation that is not parallel to that of the radiography beams.


  • Radiography requiring long exposure times for heavy wall vessels.

IRISNDT personnel have extensive experience in this technique. See Matrix Website for further details.

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ELECTRONIC REQUISITIONING, REPORTING AND TRACKING - NDT-TRAC

Between 2000 and 2003, IRISNDT was the sole NDT inspection and materials engineering supplier for one of the largest petrochemical plant construction projects ever undertaken in Canada. The daily volume of inspections, equipment, and personnel required planning and made billing a daily challenge. To streamline the work processes, IRISNDT personnel developed NDT-TRAC - Non destructive Testing Construction Management Software for large fabrication facilities. As a minimum, the software allows welding inspection specialists to:

  • Electronically submit NDT requests.


  • Standardize and streamline the reporting and costing process.


  • Track welder qualifications, welders who are qualified in specific processes and those who have passed area specific tests.

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ALLOY IDENTIFICATION

Substituting with a different alloy a small piping section has resulted in piping ruptures, fires and costly refinery production losses. After one of these expensive incidents in the early 1980's, pressure equipment owners began performing chemical analyses of every industrial plant component immediately before and after welding. These examinations would not have been possible prior to the creation of portable, simple to operate and accurate instruments that were ideal for these applications. As a result, today we use X-Ray Fluorescence based instruments for Material Verifications daily. IRISNDT has been performing these examinations for the last 20 years.

We also offer Field Chemical Analysis Spectroscopy services. X-ray fluorescence allows one to know the approximate content of heavier elements such as Cr, Ni, Mo, and others, but not of lighter elements such as C, P, and S. Until the 1980's, the carbon content of a steel alloy was often measured with wet-chemical analyses; these required filings to be removed, shipped and digested for several days to obtain a carbon measurement. Instead, mobile Field Chemical Analysis Spectroscopy instruments allow us to measure C, P, and S in multiple areas in a component, quickly and simply.

Low alloy steel pressure vessels are often clad with stainless steel plate. The plate gives the process side of the vessel the required chemical resistance while the low alloy steel keeps the vessel cost down. Around vessel openings and where different overlaid plates intersect, stainless steel weld is overlaid to seal the corrosion resistant surface. In the process, some of the carbon steel can be diluted into the deposited weld metal. The overlay carbon content being too high. IRISNDT personnel use Field Chemical Analysis Spectroscopy to verify that the welding procedure has resulted in acceptable carbon and chromium contents in the deposited weld metal. For more details see Power Point presentation.

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