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Material Specification

Home • Material Specification

MATERIAL USED FOR TRANSMISSION LINE EQUIPMENT

ALUMINIUM

Parts in contact with aluminium alloy conductors should be made of aluminium to prevent fretting corrosing. spension clamp , stain clamps , spacers , parallel grove clamps etc are cast from aluminium or aluminium alloys. Aluminum being a good conductor material, aluminum clamps afford high short circuit resistance and largely eliminate inherent losses, as they are non magnetic.

STEEL

The flowing parts are mainly made of steel.

Drop Forged Steel - All insulator string accessories subject to pull (sag) load such as Ball link, Double Eye Clamps etc.
Sheet Steel - Yoke Plates.
Flat Bar Stock - Suspension are Yoke Shackles Extension Links.
Round Bar or Tubular Stock - Arcing and Guard fittings.
Screw Steel - Rivet head bolts, Thereaded bolts etc.

All steel components are hot dip galvanized conforming to BS-729



MATERIAL GRADES

Forged accessories are manufactured from EN-8 frade steel duly mormalized Rivets threaded bolts and screw are supplied in steel of grade EN-2 special order in grade 8.8 all parts are hot dip galvanized. Soceo threads being of specified sized after galvanizing.

MALLEABLE CAST IRON

Malleable cast iron is used in particular for accessory parts for Earth Wire eg. Suspension Clamps and Tension Clamps and Tension Clamp from Malleable Cast Iron. All Malleable Cast Part are Galvanized confirming to BS.729.

GALVANIZING STEEL AND MALLEABLE IRON CASTINGS

Hot zine galvanizing is considered to be the most effective protective coating for steel and malleable cast iron under normal conditions. That is why we exclusively use hot galvanizing wherever possible. A farther advantage of this protective method that zine remains relatively inert against other metals such as aluminium or copper, so that it can be brought into direct with them without reservation.

To ensure that dimension of bolts, holes eyes, clevises etc. will be accurate after galvanizing, blanks are made accordingly, ie. screw threads are cut undersize, hexagons of socket head fasteners are pressed oversize.

Galvanizing and the corresponding test are carried out according to BS-729 specification and renowned international Standards.



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