The Circulating System

Pressures in excess of those recommended will NOT increase the resistance capacity of a brake, but will cause rapid wear on the sealing elements.

All of the mechanical energy absorbed in a Hydromatic ® Brake appears as heat in the water inside the brake. The primary function of the brake water circulating system is to supply cool water to the brake inlet, and to dissipate the heat from the brake to prevent steam formation within the brake.

The secondary function of a Hydromatic® Brake water circulating system is to provide controls to permit the driller to vary the brake capacity to meet the rig requirements, The capacity at any speed is adjustable by regulating the quantity of water being circulated between the vaned pockets of the rotor and stators in the working chamber. Depending on the type of installation, infinitely close regulation or regulation in any desired number of steps may be obtained by varying the rate of flow into the brake or varying the level of the water in the circulating system and standpipe, dependent on the type of brake and type of circulating system.

Any circulating system used must include a means for dissipating the heat from the circulating system at the rate at which it is generated in the water by the retardation of the brake. Heat dissipation may be accomplished by the use of heat exchangers, or by providing a sufficient supply of fluid to act as a heat sink.