TQIS – Pressure Equipment & Industrial InspectionsSafety. Quality. Compliance.

Introductie
Safe and reliable pressure equipment starts with thorough inspection and metallurgical assessment.
TQIS specializes in the inspection of pressure equipment and industrial installations. We ensure full compliance with the highest safety and quality standards, including ASME and PED.

Our Expertise
With in-depth knowledge in materials science, failure analysis, and Test & Inspection Plans (TIP), we help industrial companies optimize their installations and minimize risks.

Services We Offer
• Inspection and certification of pressure equipment according to PED, ASME, and EN standards
• Failure analysis and root cause investigations
• Compliance & certification support – Guidance on legal and regulatory matters
• Development of TIPs for both new builds and repairs
• Long-term inspection planning and optimization
• Reassessment studies for safety and lifetime extension
• Qualification and validation of piping systems and pressure vessels
• Inspection coordination with NL-CBI and third-party bodies
• Metallurgical assessments and damage evaluations

Who We Are
With over 35 years of experience in the chemical, petrochemical, and energy sectors, our strength lies in independent, thorough, and standards-based evaluation.
Core Focus:
Quality assurance, asset integrity, risk-based inspection (RBI), lifecycle analysis, and weld failure investigations.

Let’s Connect
Have a question or project in mind?
Connect with us on LinkedIn or send a message, we’re always open to knowledge exchange and collaboration.

Suggested Categories:
• Category: Inspection Services
• Tags: PED, ASME, ITP, RBI, Pressure Equipment, Industrial Inspections, Metallurgy, Compliance

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Every Weld Tells a Story and Sometimes It Whispers Before It Breaks

A silent threat in a pressurized recirculation line.
Inspection is not a snapshot.
Sometimes, you read the life story of a weld… and uncover a ticking time bomb.

This case involves a WB36 pipe (⌀ 298.6 × 23 mm), operating at 375 °C and 346 kgf/cm².

During a routine inspection, I detected a subtle MT indication in one of the welds.

Further investigation revealed:
A transgranular crack propagating from the inside, initiated at a notch in the root pass.

Causes & Findings

  • Crack initiated at a sharp angle caused by excessive root penetration
  • Partially filled with oxides, likely formed during or shortly after welding
  • No anomalies in hardness or microstructure (200 HV10, compliant with WB36)
  • Mechanism: Thermal stress, not pressure-induced

Lesson:

Even with properly stress-relieved weld metal, geometric stress concentrations combined with thermal cycling can initiate critical cracking.

Inspection means understanding.
It’s not just about what you see, but what it’s becoming.

Your Turn

In your experience, which geometries deserve special attention in weld design or inspection?

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