Any job in which the hammer casing comes into contact with the water surface is deemed an underwater application as, without protective equipment, the piston action of the breaker would pump water into the unit, causing serious damage.
To allow reliable operation in such conditions, an underwater connector kit with protective equipment, is used which feeds compressed air from a compressor to the breakers percussion chamber (the area between the cylinder and lower breaker section) to prevent water ingression and the problems of “water hammer”.
The converter kit developed by Atlas Copco, which can also be retrofitted, has enjoyed great success for many years.
An automatic switch prevents the breaker from being started up without ventilation so as to reliably avoid damage.
Underwater jobs are classified as special applications. Please consult your Atlas Copco customer advisor for tips on how to proceed.
Atlas Copco hydraulic breakers are suitable for tunnel heading, scaling, extension and demolition work. When working underground, abrasive dust in the air can enter the percussion chamber, the oil circuit between the attachment and the carrier can become contaminated, and rust can form on the piston from water sprinkling on the breaker. All these factors can cause considerable wear on the breaker.
To avoid these problems, an additional air source can be supplied by means of a carrier-integrated breaker ventilation. The system is easy to install by a simple hydraulic connection to the breaker installation of the carrier, while the electronic system of the carrier is not touched. The new breaker ventilation requires no separate ground space, and no extra person is needed for the air hose. It is synchronized with the hydraulic breaker and operates without emissions.
To allow the application in hot surroundings, like steel production, special kits are available.