Piping API 570

API 570 PIPING INSPECTION

© Matthews Engineering Training Ltd

API 570 Piping Inspection Code

570 © Matthews Engineering Training Ltd

API 570 COVERS IN-SERVICE INSPECTION OF PIPING To fit in with the philosophy of ANSI B31.3 ‘DESIGN CODE FOR PROCESS PIPING’

© Matthews Engineering Training Ltd

THE SCOPE OF API 570 Mandatory:Almost any metallic piping system: •Raw and finished oil products •Raw and finished chemical products •Hydrogen/fuel/flare gas systems •Sour/waste systems etc

Optional: •Water,steam and condensate •Piping related to mechanical equipment •(pumps/compressors etc) •Pressure vessels •Domestic sewers etc •Everything< ½ in dia •Non-metallic piping

© Matthews Engineering Training Ltd

API 570 INSPECTION PRACTICES Checks are needed for specific types of corrosion and cracking: 1. Injection points 2. Dead legs 3. CUI 4. Soil /Air(S/A) interfaces 5. Erosion and erosion/corrosion 6. SCC 7. Corrosion under linings 8. Fatigue cracking 9. Creep cracking 10. Brittle fracture 11. Freeze damage

© Matthews Engineering Training Ltd

We’ll look at some of these in more detail

INJECTION POINTS

Why is particular inspection attention (and TMLs) needed at injection points ?

….and what are TMLs anyway © Matthews Engineering Training Ltd

INJECTION POINT INSPECTION AREAS 12in or 3D upstream

This area is known as:The IPC(‘injectio n point circuit’) © Matthews Engineering Training Ltd

2nd change of flow direction downstream (or 7.6m after the first change)

API 570 INSPECTION METHODS External visual

Intern al visual s

TMLs (4 quadrants)

© Matthews Engineering Training Ltd

DEADLEGS Corrosion rates are higher around deadlegs

Redundant deadlegs should be removed

Deadleg

© Matthews Engineering Training Ltd

CORROSION UNDER INSULATION (CUI)

© Matthews Engineering Training Ltd

CORROSION UNDER INSULATION (CUI)

© Matthews Engineering Training Ltd

CORROSION UNDER INSULATION (CUI)

© Matthews Engineering Training Ltd

CORROSION UNDER INSULATION (CUI) Almost total wastage of bolts

© Matthews Engineering Training Ltd

CORROSION UNDER INSULATION (CUI)

API identifies the areas that are most susceptible to CUI Near steam vents and deluge systems Mist from cooling towers

Acid vapours

© Matthews Engineering Training Ltd

CORROSION UNDER INSULATION (CUI)

•All LCS pipework operating continually

at –4