| Client | Location |
|---|---|
| Major Middle East Operator | Oman |
Scope
An isolation joint (as part of the cathodic protection system) of a 36” pipeline was leaking through the internal sealing mechanism of the joint. It was not possible to isolate this joint so the repair had to be applied live. Therefore, one of the critical aspects of this repair application was the associated safety aspects of diverting the leaking gas from the joint while the repair was being applied.
Solution
The installation procedure for the clamp and composite repair consisted of the following steps;
1. Clean surface of joint and seal leak
2. Apply temporary clamp and gas diversion system
3. Prepare surface of pipeline
4. Apply composite repair
5. Perform QA/QC checks
The proposed solution involved first applying a temporary clamp over the leaking part of the joint and then applying a composite repair over the clamp to ensure longevity of the repair solution. ICR project managed the complete activity of this repair including surface preparation, clamp design and installation and composite repair design and installation.
The repair design was performed according to ISO/TS 24817. Due to live nature of the repair, the repair design was split into two parts. The first part involved the design of a temporary clamp and gas diversion system. The second part was the design of the composite repair to ensure the leak sealing capability of the repair. The solution was 15 layers of Technowrap™ 2K in the form of a fully circumferential wrap over the temporary clamp and extending along the axial length of the pipeline beyond the clamp by 300 mm.
Results & Benefits
- The application of the Technowrap™ 2K HA went as planned and without delays
- The repair was designed with a lifetime of 5 years.
- Repair was applied whilst line was live, meaning no shut down for client
| Client | Location |
|---|---|
| Major African Operator | Nigeria |
Scope
A 48” Main Oil Export line in Africa had sustained patches of external corrosion over a number of areas on the line. The client required an engineered composite repair to reinstate the integrity of the line.
The scope of work was to provide an engineered design, with 20 year repair lifetime, personnel & Technowrap ™ 2K HA materials to affect repair. Design pressure of the line was 19.6 bar g, with design temperature of 49ºC
Solution
The engineered design for the Technowrap™ 2K HA repair was performed according to ISO 24817.
Surface preparation to Sa2.5 was carried out by the client to ensure best bond of repair to substrate. The Technowrap™ repair was then installed according to ICR Installation Guidelines.
Existing concrete pipe supports were destructed and new concrete pipe supports cast and constructed to accommodate repair sites.
The client was also required to excavate trenches to allow the Technowrap™ personnel full access to the pipeline & allow the repair to be applied around the full circumference of the pipeline.
Results & Benefits
- Integrity of line was reinstated by repair
- 20 year design life
Date: January 2023
Client: Enerpro
Location: UKCS
Client challenge
In collaboration with Enerpro Group, a construction service company specialising in the repair and maintenance of Upstream Mobile Offshore Drilling Units, we were tasked with addressing a critical issue. Our expertise was sought to rectify a connection failure on an 8″ GRP Seawater Line for an offshore drilling contractor.
What we did
Technowrap™ is internationally recognised and all engineering is bespoke and completed in-house, in accordance with the latest issues of ISO 24817 and ASME PCC-2. In addition, our engineering designs are carried out to current code requirements and are validated by a range of testing.
Our team implemented a design using Technowrap™ with the following criteria:
- A 10-year lifetime
- Pressure of 4.5 bar
- Temperature of 90°C
It was specifically engineered to withstand the full applied load, considering the defect as a fully circumferential slot with an axial extent of 50mm. To complete the scope of work, we deployed one composite repair supervisor. Before installing the composite repair, we performed a live leak seal on the joint to ensure proper sealing. Once the defect had been sealed, eight layers of Technowrap™ 2K were meticulously applied to the defective area, improving its strength and durability.
Results
- The seamless installation of a Technowrap™ composite repair not only ensured an extended lifetime of 10 years but also marked the successful completion of the project within the allocated timeframe and budget, prioritising safety at every step. These expert repairs facilitated comprehensive rehabilitation without causing significant operational disruptions, resulting in substantial cost savings compared to a complete replacement. Furthermore, the absence of any hot work requirement significantly mitigated safety risks, further enhancing the overall project safety.
