Protective Strainers
Construction and Manifacturing
Protective strainers are built in or welded into pipes
so as to protect high-quality system parts, especially
pumps, compressors and measuring devices from
damage. Using protective strainers prevents processrelated waste, corrosion residues and other contaminants from penetrating into sensitive system parts.
This ensures the longevity of your machines.
The services provided by Voith Industrial Services with regard
to protective strainers are comprehensive and supplement our
broad portfolio of services in the area of on-site services and
specifically in pipe construction. We ensure outstanding quality, short delivery times and a particular emphasis on implementing special customer requirements.
Our Range of Services
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Design and construction in collaboration with the customer
Manufacturing in our workshops
Documentation
Non-destructive checking
Installation/assembly
In all activities, we observe the relevant specifications and
regulations such as:
• AD-2000 data sheet
• ASME
• DIN EN 13445 and DIN EN 13480
• DGRL 97/23/EC (within the European Union)
• Customer specifications
Strainer Models
Screen Packs
Strainer models differ in their design and thus in their implementable free screen surface. The screen surface and model
are decisive for the dirt take-up capacity and pressure loss.
The calculations of pressure loss are based on measurements
of flow rates on test rigs.
The structure of screen packs is similar in all models. A perforated plate is used as a support beam. The wire fabric is
aligned towards the direction of flow. The machine width for
the wire screen is chosen according to the critical particle size
for the component to be protected.
In order to achieve a longer service life for screen packs, in
particular for protective strainers in front of gas turbines, we
process the support beams (perforated plates) so that there
are no welding seams in the perforated areas.
Selection of the model is done in accordance with the following
parameters:
• Maximum permissible pressure loss
• Space requirement
• Strength requirement
• Material requirement and material availability
• Other customer requirements and specifications
Material for Screen Packs
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Versions of Protective Strainers
T-Y Corner or Strainer Basket Filters
Strainer version with welded ends or flange connection in
accordance with DIN or ANSI. The installation lengths are
oriented toward DIN EN 558-1 and DIN 3202-2. The installation dimensions, nominal screen connection widths and required wall thicknesses are adapted to customer-specific
conditions such as supported loads from the pipe calculation
within the framework of structural possibilities.
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Individual Customer Services
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Dome Filters
Strainer version with single or double cone, with removable
fabric upon request.
Sealing surface:
• B1/2 – C - D, EN1092-1
• RF - RTJ, ASME B16.5
Perforated plates: material 1.4571
Wire fabric: material 1.4401
Other materials on request
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Surface treatment in accordance with customer
specifications
Additional protective or drainage fabric
Additional supports for differential pressure
measurement, etc.
Flange design according to customer specification
Lifting eyes, pivoting mechanisms for blind flanges
Shut-off device for emptying/ventilating
Version with adjustable feet
Materials according to customer specification within the
framework of our authorizations
Double jacket version (with heating jacket)
Special designs
Material for Protective Strainers
In accordance with DIN or ASTM, the following materials
are used:
• Ferritic steel (P265GH, P235GH, 16Mo3,
12CrMo9 10, etc.)
• Austenitic steel (1.4301, 1,4541, 1.4571, etc.)
• Special materials (Hastelloy, Monel, Duplex, Titan, etc.)
Voith Industrial Services GmbH
Jahnstr. 25
63533 Mainhausen, Germany
Tel. +49 6182 939-0
Fax +49 6182 939-105
EnPC-Services@voith.com
www.voith.com/EnPC
Contact
Tel. Sales +49 6182 939-175
Tel. Headquarters +49 6182 939-0
Email EnPC-Services@voith.com