Applying Washers

EXCELLENT ASSISTANCE, WITHOUT CONTRAINDICATIONS

What types of damage have been observed during the maintenance of bolted flange joints?

It is common for the nut to generate a more or less deep pit on the flange surface due to friction during the tightening process. In such cases, the linear relationship between tightening torque and tension on the rod is compromised.

This phenomenon is more pronounced on smaller-sized bolts.

As bolt size increases, the phenomenon is less frequent, but the use of appropriate washers is still a highly effective precaution.

It has been proven that the use of hard material washers improves the load transmission on the rods.

The washers protect the flange surfaces from the frictional actions of the nuts during rotation and reduce relaxation phenomena due to the effects of the nut seating on the flange surface, even in the case of bolt tensioning (localized deformation on the flange that increases over time).

A WASHER AND NUT IMPROVEMENTS TO PREVENT DAMAGE TO BOLTS AND FLANGES DURING MAINTENANCE.

Download the complete document published in coworking with INAIL and presented at SAFAP.

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Advantages of VED Washers

Specific pressure differences trigger galling between the nut and flange surface, resulting in material tearing.

The use of washers with adequate thickness and outer diameter will reduce the specific pressure on the flange, minimizing seating effects (localized deformation on the flange that increases over time), particularly in high-temperature conditions.