Housing and handling
Instead of individual components that have to come together on site, we supply the filtration stage as a ready-made unit: strainer, valves and pipe connections mounted on a frame of their own. You set up the unit and connect two flanges.
various industrial strainers
Pre-strainer and fine mesh screen
Carbon steel or stainless steel
mobile design
A filtration stage rarely consists of the strainer alone. It also includes isolation valves upstream and downstream of the housing, vent and drain, often a differential pressure gauge and, for heavily loaded media, a pre-strainer. If these parts are supplied individually, a dozen interfaces arise on site – each with its own gasket, its own dimensions and its own responsibility.
Pre-assembled on a frame, all this is eliminated. The piping is made in the workshop, the dimensions are on one drawing, and the unit can be lifted and aligned as a whole. Two connections remain on the plant. Where the filtration stage does not stay in one place permanently, the frame is made mobile and moves to wherever filtering is currently needed.
What goes on the frame depends on the task of the filtration stage.
The housing stands on a welded frame instead of individual legs. The frame takes the operating weight, carries the connecting pipework and is fitted with lifting lugs or forklift pockets so that the unit can be moved as a whole. Shown in the picture: a duplex changeover strainer in stainless steel, skid-mounted, with automated ball valve, pneumatic actuator and position indicator.
Coarse particles are caught in a first stage before the medium reaches the fine mesh screen. A witch hat strainer serves as the pre-strainer. As a result, the fine mesh screen clogs more slowly, the service life increases and screen changes are needed less often – the actual reason why a station is built in two stages.
A frame on castors turns the filtration stage into a movable unit, with push handle, drip tray and forklift pockets. This makes sense wherever filtering takes place at changing locations: as a test strainer in the pilot plant, as a rental strainer for a limited period or for media such as oil and bitumen that only occur from time to time.
Every station is engineered individually. The following details show the scope within which we design.
| Component or feature | Design | Note |
|---|---|---|
Example: basket strainer | ||
| Basket strainer | e.g. DN250 PN16 | on mounting frame with lifting lugs |
| Pre-strainer | Witch hat strainer | against coarse particles |
| Fine mesh screen | second stage | mesh size according to medium |
| Butterfly valves | upstream and downstream of the strainer | control the media flow |
| Ball valve, vent | at the highest point | during filling |
| Ball valve, drain | at the bottom | before opening |
| Differential pressure gauge | across the screen | shows the degree of contamination |
Frame | ||
| Material | Carbon steel or stainless steel | same as the housing or different |
| Stainless steel | 1.4301 | from our own frame fabrication |
| Frame dimensions | 2,200 × 1,200 to 3,240 × 2,300 mm | in combination with skid fabrication |
| Surface | pickled and passivated | for stainless steel |
| Coating | up to C5-M, 320 µm | for carbon steel, for outdoor installation |
| Lifting lugs | on the frame | for attaching slings to the whole unit |
| Castors | mobile design | for changing places of use |
Available for | ||
| Basket strainer | possible | e.g. as basket strainer DN250 or mobile design |
| Simplex strainer | possible | also as a twin station with changeover |
| Duplex strainer | possible | changeover is part of the design |
A strainer station is built as a whole and delivered as a whole. That is why the transport route and installation site often limit the design more than the filtration task does. Door width, ceiling height, load-bearing floor and access for crane or forklift are part of the design.
Tell us these dimensions early. They determine whether the station comes in one piece, is delivered in two parts and assembled on site, or whether a mobile design makes more sense.
Yes. Before production starts, you receive the design draft for approval – with frame dimensions, valve positions, connection points and installation dimensions. Only once you have confirmed the drawing does the order go into production.
Gladly. Layout plans, P&I diagrams, parts lists or the data sheet of the existing plant are the best basis. Our design engineers adopt your requirements and adapt them where manufacturing or the applicable code requires it – we agree any deviations with you in advance.
The limit is usually set not by manufacturing but by transport and the route to the installation site. Frames with edge lengths from just over two to more than three metres are feasible. Tell us the access route, door dimensions and ceiling height, and we will decide whether the unit comes in one piece or is split.
Because coarse particles quickly clog a fine mesh screen. An upstream witch hat strainer catches them and can be pulled in seconds. The fine mesh screen behind it works longer before the differential pressure rises – screen changes become less frequent and easier.
Yes, that is common. We install customer-supplied valves in the station and include them in the piping. Tell us the type, face-to-face length and connection so that the geometry on the drawing is correct.
Yes. Piping and strainer are tested before delivery; for pressure-bearing assemblies with a pressure test and report. We agree the scope and test pressure with you, as well as the required certificates.
Support legs carry the housing. A frame carries the entire filtration stage with valves and piping and turns it into a unit that is moved in one piece. If you are only concerned with support, the page on support legs and mounting points is the right one.
Yes. A frame on castors is possible – for example as a test or rental strainer, with push handle, drip tray and forklift pockets. With mobile units we also make sure they are stable against tipping when filled.
All topics at a glance: Strainer options
Tell us the medium, flow rate, the required valves and the dimensions at the installation site – from this we create the draft design for your station.
