Schünemann SAB - Since 1937 - New Ideas - New Horizons


Emergency blowing system

Emergency blowing system

The emergency deballasting system is used to perform the emergency blowing process completely automatically using the on-board compressed air.

Standard Version
Nominal width: DN 32 to DN 100
Compressed air rated pressure: Up to PN 300 bar
Sea water rated pressure: Up to PN 60 bar
Operating temperature: -150 to +80 °C
Operating medium: Compressed air and sea water
Installation position: Any
Connections: Flanges acc. to DIN
Body: 2.0967
Internal parts: 2.0967 / 2.0958 / 1.4571 / 2.1504
Seals: NBR / PA6.6 / PTFE
Impact Resistance
according to BV 043/95:

Emergency Deballasting System - Explanation

If a problem occurs on a submarine whilst submerged a fast and secure surfacing of the boat is required. To achieve this every submarine is fitted with an emergency blow system (EBS). By activating the EBS large amounts of air/ gas will be transferred into the Main Ballast Tank (MBT) forcing the water out of the tank thus lowering the weight of the submarine and bringing it quickly to surface.

Over the years two different concepts have been used for emergency deballasting. They use either the on board HP air system or rocket boosters running on solid and liquid fuels.

Although EBS driven by means of rocket boosters theoretically offer a higher emerging speed, SAB believes that the use of HP air is the inexpensive, safe and tested alternative. Testing and operating the system are inexpensive and easily achieved throughout the life of the boat eliminating the need for extremely costly refurbishments. 

SABs decades of experience enable us to provide different types of EBS including single stage slow opening blow valve, single stage fast opening regulator and two stage controlled blow valve.

Depending on the customers needs and in cooperation with the competent shipyard technicians and engineers, SAB will adapt the principle, the location, the nominal diameters, opening and closing times as well as the actuation of the EBS.

SABs EBS supplied can be either mounted on the hull of the submarine or if requested inside the main ballast tanks. It can be actuated with low pressure air, with high pressure air, electrically or hyrdaulically. It can be equipped with diverse features such as a manual system override or a blocking mechanism of the second stage for emergency blow in shallow dephts.