Overview

A valve on a crude surge tank had developed a through wall defect in one spot and the surrounding area had minimal wall thickness. The nozzle and valve needed to remain operational, the through wall defect area was sealed using walker technical techno putty before the valve and nozzle were wrapped landing on the tank surface. The temperature requirement of the HT resin required a heat tape to provide an elevated temperature (80^oC) cure.

Challenges

The main challenge for this repair was to ensure the Technowrap^TM design was appropriate for the geometry with limited landing areas around the valve and nozzle arrangement. This meant designing for a 150mm circumferential, through wall defect. Other challenge's included high tank surface temp and multiple vacuum applications to the tank surface.

Solution

• Technowrap 2KTM HT system with temperature capability up to 220^oC;
• A start-up design was used to bring the line on live as early as possible (saving two days);
• Heat tape required for elevated temperature cure;
• Design for complex geometry;
• Vacuum application techniques;
• Versatility by delivering by a patch solution rather than a typical wrap repair. This created a more cost effective solution whilst still achieving the desired outcome.