Power Generation

  • CUSTOMER: ELECTRICAL UTILITY, Vancouver Island, BC.
  • APPLICATION DATE: August 1990
  • PROBLEM: Oil was leaking out between the flanges.
  • PRODUCTS:
    Belzona® 2211 MP Hi-Build Elastomer
    Belzona® 2221 MP Fluid Elastomer
  • SUBSTRATE: Mild steel.
  • APPLICATION METHOD: Application carried out in accordance with a modified version of Belzona® Know-How Leaflet TCC-2
  • BELZONA FACTS: Using Belzona® allowed the repair to be completed without having to remove the top from the transformer which would have resulted in many hours of outage time.

  • CUSTOMER: ELECTRICAL UTILITY COMPANY, Vernon, BC
  • APPLICATION DATE: August 2000
  • PROBLEM: Oil was seeping into electrical buss box causing a disruption in electrical supply.
  • PRODUCTS:
    Belzona® 2221 MP Fluid Elastomer.
  • SUBSTRATE: Mild steel and brass electrical connectors.
  • APPLICATION METHOD: Application carried out in accordance with Belzona® Know-How Leaflets GSS-4
  • BELZONA FACTS: Using Belzona® eliminated the need to have the equipment taken out of service for a prolonged period.

  • CUSTOMER: Power Generation Facility, Jordan River, BC
  • APPLICATION DATE: August 2003
  • PROBLEM: Insulators were leaking oil.
  • PRODUCTS:
    Belzona® 2121 D&A Hi-Coat Elastomer
  • SUBSTRATE: Porcelain and Aluminum
  • APPLICATION METHOD: Application carried out in accordance with Belzona® Know-How Leaflet GSS-3
  • BELZONA FACTS: Belzona products have been used for many of theses types of sealing applications over many years with good success.

  • CUSTOMER: Pulp & Paper Operation, Powell River, BC
  • APPLICATION DATE: May 2001
  • PROBLEM: Turbine runner was showing signs of erosion on the leading edges of the vanes
  • PRODUCTS:
    Belzona® 1311 Ceramic R Metal
    Belzona® 1341 Supermetalglide
  • SUBSTRATE: Cast Iron
  • APPLICATION METHOD: Application carried out in accordance with Belzona® Know-How Leaflet CEP-1,3
  • BELZONA FACTS: Using Belzona allowed the operation to deal with the erosion problems before they became a major problem. Coating the runner with Belzona® 1341 Supermetalglide will improve its performance and protect it from corrosion in the future.

  • CUSTOMER: Sawmill, Canoe, BC.
  • APPLICATION DATE: July 2005
  • PROBLEM: The cooling fins of the transformer had been damaged. Previous repairs lasted only a shortwhile
  • PRODUCTS:
    Belzona® 1111 Super Metal
    Belzona® 1221 Super E Metal
  • SUBSTRATE: Mild steel
  • APPLICATION METHOD: Application carried out in accordance with Belzona® Know-How Leaflet VPF-1/2
  • BELZONA FACTS: Rebuilding the damaged area provided a quick and simple solution to a constant problem area and was accomplished with the minimum amount of downtime.

  • CUSTOMER: Power Generating Dam, Mica Creek, BC
  • APPLICATION DATE: 1993
  • PROBLEM: Sulfur Hexafluoride gas was leaking from the joints of the system requiring regular refilling..
  • PRODUCTS:
    Belzona® 2211 MP Hi-Build Elastomer
  • SUBSTRATE: Steel
  • APPLICATION METHOD: Application carried out in accordance with Belzona® Know-How Leaflet GSS-4
  • BELZONA FACTS: This application has been in service for many years with only minor repairs required. TOTAL TIME IN SERVICE - 13 YEARS

BELZONA ELASTOMERS SEAL SF6 GAS LEAKS AT HYDRO ELECTRIC POWER FACILITY

BELZONA FACTS

28 March, 2008 – OVERVIEW OF APPLICATION COMPLETED IN 1993

Sulphur Hexafluoride, or SF6, is an inorganic compound used widely as a gaseous insulator in high voltage breakers, busses and other equipment – referred to as gas insulated switch gear, or GIS. SF6 gas is colorless odorless, non-toxic and non- flammable, but is considered to be 25,000 times more effective as greenhouse gas as CO2 and is therefore considered an environmental hazard and is rigidly controlled. It is also quite expensive with a cost exceeding $ 2500.00 per 100lb bottle.

The GIS Technology was first used in North America at BC Hydro’s MICA Generating Station, a large power dam on the Columbia River in central British Columbia, completed in 1973 and brought on line over the next few years. It formed the Kin Basket Reservoir and was the highest earth filled dam in the world at that time.

Gas insulated switchgear manufactured by ITE, considered state of the art at that time, was imported from Europe and installed. The GIS installed at Mica GS use SF6 pressured to about 45psi as an insulator. Pressure is monitored and fresh SF6 is added if any loss is detected. Unfortunately Mica GS immediately began to loose significant amounts of SF6 gas. Newer installations using GIS did not experience similar losses due to advances in design, manufacturing and installation. Various efforts were made to seal the buss work but leaks persisted.

Meanwhile during the early 1990’s Belzona Elastomers were being used to seal oil filled transformers for BC Hydro and one of the senior technologists believed that these materials might work to seal GIS leaks at Mica GS.

Over the course of 2 maintenance outages in 1993 the identified problem areas were sealed with Belzona 2211 and 2221 MP Elastomers and in some cases Belzona 1321 Ceramic S Metal. The two types of leaks addressed were flanged joints – by far the most common and also the most difficult to seal – and pin holes in welds.

SF6 leaks can only be located by electronic “sniffers” and since it is heavier than air it tends to flow along the switchgear and drip from any low point so pinpointing the actual leak is difficult. Since the gas can flow beneath a suspect spot the entire joint should be encapsulated.

PERFORMANCE AND COST EFFECTIVENESS

The Belzona materials applied in 1993 have proven completely effective for more than a decade now. SF6 consumption had dropped from more than 50 bottles per year to a mere 2-3 – a savings of more than $1 million over 10 years. More important SF6 gas was kept out of the atmosphere.

The switchgear at Mica GS is currently being replaced with more up to date equipment as spare parts are no longer available. However, should leaks develop in the new equipment Belzona Elastomers will be the product of choice, based on its past history and performance.

  • CUSTOMER: Power Supply Company
  • APPLICATION DATE: September 1992
  • PROBLEM: The gasket seal had failed and needed replacement. This would have required draining the tank so that the valve could be removed.
  • PRODUCTS:
    Belzona® 2211 MP Hi-Build Elastomer
  • SUBSTRATE: Steel
  • APPLICATION METHOD: Application carried out in accordance with a modified version of Belzona® Know-How Leaflet VPF-1
  • BELZONA FACTS: Repair Completed in Just 2 Hours using Belzona Elastomers. A Conventional repair would have cost many thousands of dollars to drain, store and re-fill the transformer oil tank.

  • CUSTOMER: Power Supply Company
  • APPLICATION DATE: June 1998
  • PROBLEM: SF6 Gas was leaking through the porcelain bushing seals .
  • PRODUCTS:
    Belzona® 2211 MP Hi-Build Elastomer
  • SUBSTRATE: Porcelain
  • APPLICATION METHOD: Application carried out in accordance with a modified version of Belzona® Know-How Leaflet VPF-11
  • BELZONA FACTS: A fast and economical repair.

  • CUSTOMER: Electricity supply company
  • APPLICATION DATE: May 1997
  • PROBLEM: SF6 gas leaking from the joint between the metal base and the porcelain insulator
  • PRODUCTS:
    Belzona® 2221 MP Fluid Elastomer
  • SUBSTRATE: Steel and Porcelain
  • APPLICATION METHOD: Application carried out in accordance with a modified version of Belzona® Know-How Leaflet VPF-5
  • BELZONA FACTS: The high di-electric strength of Belzona Elastomers and its ability to bond to a wide range of substrates ensures a good and long lasting seal between the 2 surfaces.