You are here: Home » Products » Restrictions and critical flow devices » Multistage pressure reduction » Multi stage restriction, gas

EMCO Multi stage depressurizing unit for gas

SDP-G:  EMCO single hole multi stage depressurizing unit are used to reduce the pressure in a number of stages to a desired pressure. 

MDP-G:  EMCO multi hole multi stage depressurizing unit are used to reduce the pressure in a number of stages to a desired pressure and to secure as low noise development as possible 

Principle:  The gas passes each stage at sonic or critical velocity. When the pressure is reduced so is the density of the gas or steam. In order to maintain a constant velocity the cross sectional area is increased after each stage.
The calculation is based on R.W. Miller and Ward-smith.
Each of the pressure reducing stages are connected and supplied as a unit

Construction
Design and calculation standards
R.W. Miller: Flow Measurement Engineering Handbook, Ward-Smith ISO 5167 etc.
Sizes
1/2" - 24"
Pressure rating
150 - 2500 lbs,
Orifice plate shape
Square edge concentric
Plate thickness
thickness is calculated to handle the differential pressure
Distance between each stage
1 - 2 times inner pipe diameter
Material, plates
AISI 316 (standard), and other erosion resistance materials on request
Material, spool piece
P235GH (A106 Gr. B or C), AISI 316, AISI 321, Duplex Hastelloy, other materials on request.
Mounting style
Between flanges according to ANSI B16.5 or DIN Standards or butt weld ends.
Overall length
Depends on number of stages and pipe size. Each multi stage is calculated individually
Documentation
Material certificate acc. to EN 10204-3.1. Noise calculation
Technical Data
-
-
-
-
-
-