Hercules Engineering Herculon Type D tank top bearings

Steel, concrete and fibreglass tanks need secure roofs that can withstand the expansion and contraction caused by factors such as climatic and load variations.

Hercules Engineering offers a range of Herculon Type D Tank Top Bearings (HLD/TT), which are custom designed for easy installation under the roof beams of tank tops and other lighter structures including some building roofs. These low-friction easy-slip bearings are particularly useful where loads are relatively small but both lateral and uplift forces need to be accommodated.

HLD/TT bearings are part of a range of Hercules composite slip joints and structural bearings for a wide variety of structures and weights incorporating engineered combinations of engineered thermoplastics and metal facing surfaces.

HLD/TT bearings consist of a thin stainless steel slide plate with two stainless steel studs flash welded to the upper face. The lower face is highly polished and the plate is provided with two slotted holes for uplift through-bolts. This plate slides against a Herculon-coated Hercupad, which has two clearance holes drilled into it.

There are five stock sizes in working loads from 50-70 kN. Larger capacities and different dimensions can be custom-engineered. The coefficient of friction is 0.05 to 0.08, depending on stress, and the expansion capacity is up to ±20 mm, which can be custom designed for larger movements. Maximum rotation is up to 0.01 radians, with a maximum temperature of 80°C.