Inspection of Piping Systems

( In-Service)

API 570 Code

API: American Petroleum Institute Code: Means that it is a mandatory (Jurisdictional requirement) to be followed (in USA & CANADA)Inspection: QC Functions performed by the owners inspector or inspectors delegatesRepair: The work necessary to restore a piping system to a condition suitable for safe operation at the design condition.Alteration: A physical change in any component that has design implications affecting the pressure containing capability or flexibility of a piping system beyond the scope of its design.Rerating: A change in either or both the design temperature or the maximum allowable working pressure of a piping system. A rerating may consist of an increase, a decrease, or a combination of both. Rerating below original design conditions is a means to provide increased corrosion allowance.

Position Measurements

On-Stream: Piping Containing any amount of process fluidOff-Stream: Piping While in Shut-Down ( No process fluid contained in the piping )Reasons For Inspection:The primary purpose of inspection is to identify active deterioration mechanisms & causes of deterioration to specify repair, replacement or future inspections to prevent or retard further damage.

Piping System: An assembly of interconnected piping, subject to the same design

conditions .

Proximity TransducerInspection of Piping Systems

When Could API 570 Be applied??

Objectives of Inspection

What to Inspect For & Where ??Each owner/User should provide specific attention to the need for inspection of piping systems that are susceptible to specific types & area of deterioration.

Areas & Types of Deterioration

Areas & Types of Deterioration

Areas & Types of Deterioration

*Areas of Deterioration

Prepared By: Eng. Osama Elsaadawy * Areas of Deterioration Cont.

Prepared By: Eng. Osama Elsaadawy

*Areas of Deterioration Cont.

*Areas of Deterioration Cont.

*Areas of Deterioration Cont.

When to Inspect ??

*Piping Service Classes Acc. API 570

Piping Service Classes Acc. API 570 Cont.

Piping Service Classes Acc. API 570 Cont.

How to Inspect for Deteriorations ??

Types of Inspection &Surveillance Cont.

*Types of Inspection & Surveillance Cont.

*Notes

For more information about the detailed inspection for piping systems components & deteriorations mechanisms, Ref. to API RP 574 & API RP 579.

Pressure tests not normally conducted as part of a routine inspection, But when conducted this will be after completing a repair, alteration OR rerating.

Recommended Max. Intervals For Inspection

Recommended Max. Intervals For Inspection

Recommended Max. Intervals For Inspection

Inspection Data Evaluation & AnalysisAPI 570 Recognize fitness -For- Service concepts foe Evaluating In-service Degradations .API RP 579 provides general requirements & detailed assessment for specific types of degradation that are referenced in API 570.How To Use The Inspection Findings ??

*Inspection Data Evaluation & Analysis

LTCR (mm) = t initial - t actual Time (years) between them

STCR (mm) = t previous - t actual Time (years) between them

RL (years) = t actual - t required Corrosion Rate (mm)

MAWP = 2SET/D >= Design Pressure

Calculations Of CR, RL & MAWP

*Repair, Alteration & Rerating

Repair, Alteration & Rerating

*ReratingRating: Design Pressure & Temperature Ranges As well As Operating Pressure & temperature

Inspection Of Buried piping Inspection of Buried Process Piping is deferent from other process piping because significant external deterioration can be caused by corrosive soil condition.

Types & Methods of Inspection

Frequency Of Inspection For Buried Piping Without Effective Cathodic protection

Frequency Of Inspection For Buried Piping Without Effective Cathodic protection

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