KHIA headerKnow-How in Action

VOL XXXIII, NO 3

Belzona® Repairs A Gate Valve Crack

 
 

Industry:

 
 

Application:

Valves, Pipes and Fittings (VPF)

 
 

Customer Location:

Oregon, USA

 
 

Application Date:

October, 2017

 
 

Application Situation:

36" gate valve on a crane ship.

 
 

Problem:

The disk of the gate valve had a large crack extending from the seat rings on the edge to the center of the disk.

 
 

Products:

Belzona 1111 (Super Metal)

Belzona 9341 (Reinforcement Sheet)

 

Substrate:

Ductile Iron

 
 

Application Method:

The application was carried out in accordance with Belzona Know-How System Leaflet VPF-8. Procedure was followed out on both sides of the disk.

 
 

Belzona Facts:

Due to the composition of the ductile iron welding would have been difficult. Welding also would have introduced heat stresses as well as the potential for galvanic corrosion. ABS approved this method to get the vessel back in water with minimal downtime.

 
 

Photographs Description

1. Crack in disk of gate valve

2. Holes drilled, tapped and studs inserted. Crack terminated.

3. Reinforcement sheet incorporated to add strength.

4. Completed application.

 
Case study pic one

 

 
 Case study pic two

 

 
 Case study pic three

 

 
 Case study pic four

 

 
 
For more information about Belzona visit: www.belzona.com