FORUM ON NON DESTRUCTIVE TESTING QA/QC /QC WORKIN ING COMM - - PowerPoint PPT Presentation

S.K. Babu

Director WENS Quality Assurance (SIN) Pte Ltd Hon Secretary – NDTSS, Singapore

FORUM ON NON DESTRUCTIVE TESTING

QA/QC /QC WORKIN ING COMM MMITTE ITTEE - ASPRI RI

• Non Destructive Testing plays a vital role in the process

industry either is petrochemical, Oil & gas. The talk will cover the introduction of basic NDT Methods & how the qualification of NDT operators affect the quality of workmanship in testing & inspection of weldments & associated components.

• Advancement in NDT test methods & Interpretation
• Available personnel certification programs in Singapore
• QA/QC program for NDT subcontractors

A procedur dure, which h covers rs the inspection tion and/or r testin ting g of any materi rial, l, component t or assembly bly by means, s, which h do not affect t its ultimate te serviceab ceabili lity ty.

Visual

• Material Receiving Inspection
• Fabrication of Piping, Equipment's (Welding Inspection – Before,

During After)

• Installation /Erection of Equipment's
• Line Testing, Commissioning
• Maintenance
• Dismantling

Sherlock Holmes when he wrote: “ I see no more than you but I have trained myself to notice what I see

OPEN TO SURFACE/ SURFACE BREAKING SUBSURFACE INTERNAL

Penetrant Testing can only detect surface breaking defects Penetrant must be able to enter the defect to form indication

Cannot be detected by Penetrant Testing Maybe detected by Penetrant Testing

Basic Steps

• Penetrant application
• Removal of excess

penetrant

• Pre-cleaning
• Application of

Developer

• Inspection
• Post-cleaning

• Penetrating fluid (penetrant) applied to

component and drawn into defect by capillary action

• Removal of excess penetrant
• Apply Developer

Penetrant drawn back out of the defect by reverse capillary action

Penetrant which pulled out from the defect by the developer forms indication of the defect Indications

• Applicable to non-ferromagnetics
• Able to test large parts with a portable kit
• Batch testing
• Applicable to small parts with complex geometry
• Simple,cheap easy to interpret
• Sensitivity

• Will only detect defects open to the surface
• Careful surface preparation required
• Not applicable to porous materials
• Temperature dependant
• Cannot retest indefinitely
• Compatibility of chemicals

Ferromagnetic Material

Surface Defect Subsurface Internal

MT MT

CANNOT BE DETECTED BY Magnetic Particle Testing

Magnetic Particle Testing

Basic Steps

• Magnetic field induced in

component

• Defects disrupt the magnetic

flux

• Defects revealed by

applying ferromagnetic particles

How to detect the ones missed?

Relevant/ True Indications

Indications caused by defects