dredges

Pressair International

Pressair dredges are committed to excavating masses of solids such as sand, gravel, and ore. They are the backbone of any processing facility and must perform efficiently and trouble-free over many years or even decades. Efficient energy usage, high solids output, little wear, 100% availability and complete, clean excavation of the deposit are standard features that a Pressair dredge offers.

The time has come for Pressair.

Not "off the shelf"

but as reliable as a machine built in series. Pressair dredges are tailored to the job. Proven components of most reputable suppliers and task-optimized engineering guarantee a reliable service.

As requested, diesel powered or electrical, with dewatering drum, wheel, screen or for direct discharge into barges – all options are possible

High performance as a standard:

Pressair dredge model series:

Values for orientation only and at normal deposit.
Data of other models/ depth on demand.

When is a Pressair the right choice?

There exists no universal machine that is equally well suited for any deposit, granulation and depth. Generally we recommend Pressair dredges when the possible depth exceeds 15 m and where it is not pure sand. However, there are other aspects to consider, such as transport distance, foreign particles and oversize material, and the expected total lifetime of a deposit. You can trust our expertise and that we will consider your project impartially and, if after consideration decide that our own system is not suitable, recommend a conventional technology.
Unlike other traditional dredging methods, in a Pressair dredge there are no mechanical parts directly attacked by abrasive or destroying particles. Solids do not have to pass pump shells, impellers or ellbows. There are no wearing buckets, rods, pins, chains or ropes, and thanks to the vertical position of the dredging pipe, hardly any wear occurs there. The result is lower maintenance and wear costs, and unmatched reliability and productivity.
For more information about Pressair's principle of operation, select technology.

Browse through our picture gallery where we show some typical Pressair dredges and pertinent equipment.


The following pictures show the solids production after separation of water by means of a Pressair drum, screen, wheel or direct discharge into barge. To transport material (in particular sand and silt) hydraulically over long distances, we can offer booster stations for pipeline transport.

The following pictures show the solids production after separation of water by means of a Pressair drum, screen, wheel or direct discharge into barge. To transport material (in particular sand and silt) hydraulically over long distances, we can offer booster stations for pipeline transport.

What counts:

- constant excavation
- from any depth
- most economically !

For material transportation Pressair can supply self-propelled bottom-dump-barges, self-discharging silo-barges and floating conveyors. Floating conveyors are available as 20 m units and as modular catamaran-type units with up to 100 m length.
The following pictures show some Pressair installations around the world, serving our customers to maintain a reliable and economical production and to generate the best return on their investment.

The 2 machines below are DSB 400's with dewatering screens and fine sand processing plants. They produce 400 t/h at 20 resp. 30 m depth.

Beim Einsatz eines Schöpfrades - hier die einstufige Ausführung – erübrigt sich der Einsatz eines Hydrozyklons. Vorteile sind der geringe Energiebedarf und der geringere Verschleiß. Allerdings ist der Investitionsaufwand wegen der großen Setzwanne und der größeren Pontons bedeutend höher.

Der Kiesabbau ist hier gleichzeitig ein Tiefbauprojekt. Ein über 4 m²;; großer See, der als Trinkwasserspeicher dient, soll vertieft werden, um die Speicherkapazität zu erhöhen. Für den Materialtransport kamen nur selbstfahrende Klappschuten in Betracht. Pressair lieferte einen Doppelbagger (mit zwei unabhängig voneinander arbeitenden Fördereinrichtungen) sowie selbstfahrende Bodenklappschuten. Es waren höchste Anforderungen hinsichtlich der verwendeten Technik, der Betriebsmittel, der Schwimmstabilität und der Hygiene zu erfüllen. Zur Beladung fahren die Schuten zwischen dem Katamaran-Ponton in den Bagger ein und werden ohne Vorentwässerung beladen.

Elementar wichtig

für die Funktion und Betriebssicherheit von Pressair-Baggern sind der Förderkopf und die Verdichter-Anlage. Dies betrifft nicht allein die rein mechanische Funktion, sondern insbesondere die Verfahrenstechnik, die Art und Weise, wie wir mit der Luft als Fördermedium umgehen. Dafür wurden uns in allen namhaften Industrieländern Patente erteilt.

Elektrosteuerung

Modern, robust, übersichtlich. Teil- oder Vollautomatik, Ferndiagnose, Fernwartung, automatische Überwachung aller Motore. umfassender Maschinenschutz.

Alles unter Kontrolle

Typical Pressair visual-touch-screen start display. All controls are clearly arranged over several pages. The major operating data such as output capacity, dredging depth, operating hours etc. are shown.

Wartung und Service

Regelmäßige Wartung entfällt. Alle Maschinen sind wartungsfrei (dauergeschmiert oder mit automatischem Schmiersystem). Serviceintervall: 1 x jährlich oder alle 1.600 Betriebsstunden.