External Corrosion High Temperature (HT) Repair

Overview

Corrosion under insulation resulted in significant external wall loss on an onshore hydrocarbon processing line.

A rapid repair with high temperature and complex geometry capabilities was required immediately to bring the line back into service.

Scope

The line had the following specifications:

Structure	Demethaniser pipework
Surface Preparation	Sa 2.5
Design Pressure	3,790 kPa
Design Temperature	1210C
Application Temperature	200C
Design Life	2 years
Wrap Length	1,300 mm
Pipe Diameter	200 mm NB
Corrosion Type	External
Defect Details	Circumferential wall loss
Post Cure	Yes - heat tapes

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Solution

The solution to this project was:

• Technowrap™ 2K HT system with temperature capability up to 220°C
• Heat tapes used to provided post cure temperature of 60°C-80°C
• Heat tapes were used around the clock, to meet rapid delivery requirements of client

Benefits

The benefits of executing this solution were:

• Repair completed with rapid engineering and site delivery, within 24 hours
• No impact on production, line remained live
• Documented QA/QC procedures provide a complete record of the repair materials and application process for future reference