Belzona Repairs Nozzles with Through-wall Defect Online on Offshore Platform

KHIA ID: 8571

Industry: Oil & Gas (OILG)
Application: VPF-Valves, Pipes and Fittings (VPF)
Substrate: Carbon Steel

Customer Location: China
Application Date: 2017

Products:
Belzona 1111 (Super-Metal)

Belzona 1983 (Superwrap II Resin)

Belozna 9381

Belzona 9382

Belzona 9111 (Degreaser)

Belzona 9611

Problem: The nozzles of closed drain drum had developed thin-wall defect and through-wall defect due to CUI.

Photograph Descriptions

1. Nozzle with through-wall defect

2. During Belzona Superwrap II application

3. Complete application of Belzona Superwrap II application

4. View of nozzles after 3 years

Application Situation

Nozzles of closed drain drum on offshore platform suffering from corrosion and significant thickness loss. The design pressure is 0.35MPa, the design temperature is -3℃∽110℃.

Application Method

The repairs were designed in accordance with ISO24817 standard. The application was completed by Belzona trained and validated installers in accordance with Belzona Know-How System Leaflet VPF-11. Belzona supervisor and the on-site representative of BV supervised the whole process. The whole application involved 2 one and half-inch nozzles, 15 two-inch nozzles, 1 three-inch nozzle and 4 four-inch nozzles. One of the 2” nozzles has developed through-wall defect.

Belzona Facts

For conventional welding, the whole closed drain drum need to be shut down and isolated, with thorough cleaning and water injection, which costs at least 15 days of downtime and affects the production. Welding in confined space may also cause hazards. Therefore, the customer has been looking for the solutions with no hot work required but also accepted by classification society. Meeting the standard of ISO24817 and ASME PCC-2, Belzona Superwrap II can repair the nozzles of pressure vessels on-site, with no downtime or hot work required. The application is still in good condition after 3 years.

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