SDP-L: EMCO single hole multi stage pressure reducing units are used to prevent critical/high pressure drops in continuous liquid flow pipe
lines
MDP-L: EMCO multi hole multi stage pressure reducing units are used to prevent critical/high pressure drops in continuous liquid flow pipe lines. Multi hole plates can handle higher pressure drops than single hole plates
Principle: By reducing the pressure in stages the damaging cavitation is
avoided. This secures long life time of the equipment.
Cavitation occurs during pressure reduction when the pressure in the
Vena Contracta (the bore of the plate) is lower than the vapour
pressure. Cavitation generates noise, erosion and vibrations.
The calculation is based on ISO 5167, and a critical flow factor or
cavitation factor for determining allowed pressure loss across each
stage. Each of the pressure reducing stages are connected and
supplied as a unit.
![MDP-L1-Main[2]](https://www.emcocontrols.com/wp-content/uploads/2022/05/MDP-L1-Main2.png)
![SDP-L_3-Main[1]](https://www.emcocontrols.com/wp-content/uploads/2022/05/SDP-L_3-Main1.png)
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Design and calculation standards
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ISO 5167, Handbook, R.W. Miller: Flow Measurement Engineering Handbook, etc., ASME
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Sizes
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DN 15 – 300, 1/2" - 12", larger sizes on request
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Pressure rating
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PN 16 – 400, 150 - 2500 lbs
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Multi stage design
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Constant cavitation factor
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Orifice plate shape
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Square edge concentric
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Plate thickness
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thickness is calculated to handle the differential pressure
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Distance between each stage
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2 - 3 times inner pipe diameter
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Material, plates
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AISI 316 (standard), and other erosion resistance materials on request
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Material, spool piece
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P235GH (A106 Gr. B or C), 16Mo3 (F1), other materials on request
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Mounting style
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Between flanges according to ANSI B16.5 or DIN Standards or butt weld ends.
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Overall length
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Depends on number of stages and pipe size. Each multi stage unit is calculated individually
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Documentation
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Material certificate acc. to EN 10204-3.1. Noise calculation
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