Multistage Restriction Orifice Assembly

Multi-Stage & Multi-Hole Restriction Orifice Assemblies

Aditya Steel Engineering Co. is widely recognized as a world leader in the design and manufacturers with qualified engineers team of restriction orifice assemblies and flow control systems with more than 10 years’ experience. We are Manufacturer, suppliers and exporters of Multi-Stage & Multi-Hole Restriction Orifice Assemblies for Gas Blowdown, Gas Blow-by Cooling Water Recycling Lines.

Manufacturer of Multi-Stage & Multi-Hole Restriction Orifice Assemblies

Aditya Steel has built up significant experience and expertise within this area, and have a vast array of installations worldwide on offshore platforms, FPSOs, LNG plants, and mines. Users have selected us based on our design and application knowledge, uncompromising quality, proven project delivery, and industry leading machining and welding capability. Many of the world’s leading users within oil & gas production, LNG production and mining, come to Aditya steel to ensure the right solution is supplied first time.

Manufacturer, fabricators and exporters of Square edge bore or standard bore orifice plate, Quadrant edge bore, Eccentric bore orifice plate, Segmental bore orifice plate. RTJ-type orifice plate with an integral gasket, Paddle-type orifice plates, Restriction orifice assembly in India, Maharashtra, Mumbai.

Restriction orifice plates are widely used for managing pressure drops and to control flow rates by restricting flow, regardless of downstream conditions. For high pressure and/or high noise applications, multi-stage restriction orifice assemblies are becoming increasingly common as a proven solution, demonstrating their ability to prevent cavitation, critical flow and flashing from occurring.

Different types of Assembly of Products

Aditya Steel is widely recognized as a world leader in the design and manufacturers with qualified engineers manufacturer, suppliers and exporters of Multistage Restriction Orifice Assembly, Orifice plate multi-stage multi-holes, Cavitation and Flashing in Liquid flows, Choked flow in gases, Excessive Noise / Vibration, Integral Orifice Assembly, carrier ring plate Assembly meter run Assembly, Assembly between flanges / Montage entre brides, Single hole restriction orifice, Multi-hole restriction orifice, Multi-stage restriction orifice, Complete multi-stages system, Single hole restriction orifice, Orifice de restriction simple trou, Single hole and multi-holes multi-stages restriction orifice, Orifice de restriction simple trou et multi-trous multi-étages, Ring Type Joint orifice plates, Concentric Orifice Plate,Eccentric Orifice Plate, Quadrant Edge Orifice Plate, Universal Orifice Plate, Restrictioin Orfice Plate, Single Stage Restriction Plate, Multi Hole Restriction Plate, Multi Stage Restriction Orifice Plate Assembly, Ring Type Joint Orifice Plate, Orifice Plate Flow Meters, Differential Pressure Flowmeters, orifice plate flow meter, segmental wedge flow meter, V-cone flow meter, and venturi tube flow meter, meter run flow meter, flow nozzle in Mumbai, Maharshtra, India


Gas Blowdown

Required typically to reduce pressure down to atmospheric. Increasingly common on offshore platforms where higher pressure drops and flow rates exist and control valves are expensive to install & maintain.

Gas Blow-by

Typical case is flow of hydrocarbon condensate from high pressure separator. Usually a level control valve controls the level of the high pressure separator. In case of valve failure, the valve needs to open fully to stop separator from overflowing. To stop the downstream systems from overloading due to gas flow, Similar application is seen in the heating medium flow in.

Cooling Water Recycling Lines

Common in mining and LNG producing plants, a multi-stage restriction orifice is a cost effective method for managing pressure within the water system. For example, a multistage restriction orifice assembly is used to manage a constant re-circulation flow. The recirculation ensures that cavitation and starvation cannot happen in the pump.

Restriction orifice plates are traditionally used to reduce pressure by forcing the flow through a restricted bore. The precise pressure drop is produced by accurately calculating the orifice bore and plate thickness required. For high pressure drops (especially high flow), restriction orifice plates are usually unable to meet the pressure drop without issues arising in relation to cavitation, flashing, high noise and vibration.

In these instances, users have two main choices:

  1. A control valve, which although has the flexibility of potentially varying flow conditions, is expensive to purchase and maintain due to various moving parts.
  2. A multistage restriction orifice assembly which is cost effective and free from maintenance.

Aditya Steel Engg. co. has become a world leader in the niche area of multistage restriction orifice assemblies, which requires great amount of technical understanding and experience within specific applications to ensure the “right” solution is designed and manufactured to meet the pressure drop requirements.

Typically multi-stages are poorly understood due to a lack of understanding of the application, lack of understanding of design requirements for both ISO5167 and limitations of pressure drops in multiple steps.

With significant experience in designing and manufacturing multi-stages for numerous applications such as blow down and water cooling re-cycling systems we have seen pitfalls of poor designs and lack of understanding of process and application. This can lead to costly shutdowns (sometimes unexpectedly) as equipment is replaced due to cavitation/flushing, excessive noise/vibration, or choked flow occurring.

What is Cavitation?

Cavitation is an erosive condition which occurs when the internal pressure of the liquid passing through the orifice falls below its vapour pressure and vapour bubbles form. Further downstream from the orifice the pressure recovers sufficiently to collapse the bubbles with extreme violence. Cavitation calculations are performed during the design stage of a MSRO to calculate cavitation factors at each stage in the orifice assembly.

What is Flashing?

This is similar to cavitation except that the process pressure never recovers sufficiently to collapse the gas bubbles resulting in two phase flow – liquid and gas – downstream of the orifice. Erosion of the pipe work and valves and other instrumentation can occur due to the impact of liquid droplets arrived at high speed in the vapour flow.

What is Choked Flow?

Otherwise known as critical flow, this occurs when too large a pressure drop is attempted across a single orifice plate. When the downstream pressure is less than 53% of the upstream pressure, the flow through the orifice will become sonic, at which point no further increase in flow can be achieved by either increasing the upstream pressure or lowering the downstream pressure. A MSRO will enable staged reductions in pressure to prevent choking from occurring.


Design and Calculation

Each multistage restriction orifice assembly is a bespoke design. We work closely with process engineers to advise what limitations there are in the design of such equipment so that this can be considered as part of the overall system in the plant.

Design & calculations standards : ISO 5167, RW Miller (Flow Measurement Engineering Handbook), ASME
Noise Calculations : BS EN 60534-8-4.
Sizes : Up to 30”
Pressure Rating : +2500lbs
Distance between each stage : 2-4 times inner pipe diameter

Applications – standards

StandardsISO5167-1, BS1042, ASME.MFC.3M
Manufacturing & welding : ASME9, ASME5, EN288
Fluid temperatureAccording specifications
Type of fluidGas, steam, liquid
Nominal diametersND15 to ND1000 (from ½ up to 30 inches) – and beyond
according specifications
Maximum operating pressureLimited by the flange rating – from 150# to 2500#


Plates assemblyComplete multi-stages system including several plates
welded in series in the pipe
Process connectionProcess connection to existing pipe work, between flanges
(RF or RTJ) or butt welding

Technical description

Number of platesCalculation depending on the process conditions and on the
application requirements 
Distance between platesMultiple restriction orifice plates separated by a distance of 1
pipe diameter (nominal diameter of the pipe)
Number of orifice boresDepending on the application, multi-bores restriction orifices
are used to reduce the noise level (limited to 85dB(A)
according to international noise standards)
TraceabilityDirect laser marking with a flow direction indicator

Manufacture & Assembly

Manufacture, Assembly & Fabrication.

Our in-house machinists and welders are trained to industry leading quality standards, and have experience across a vast array of exotic materials such as hastelloy, monel, duplex stainless steel, Inconel, and others. We are approved suppliers to all leading Oil & Gas producers, miners, and EPCs and our facilities and operators are regularly audited by such users. We are also an approved supplier to the Defense Industry.

Other Material grades also available :
Stainless Steel :
Grade: 304, 304L, 304H, 309, 309S, 316, 316L, 316H, 310, 310S, 317, 317L, 321, 347, 904L
Monel :
Grade: Monel 400, Monel K500, Monel R-405
Nickel :
Grade: Nickel 200, Nickel 201
Inconel :
Grade: Inconel 600, Inconel 601, Inconel 625, Inconel 718
Incoloy :
Grade: Incoloy 800, Incoloy 800H, INCOLOY 800HT
Hastalloy :
Grade: Hastalloy B2, Hastalloy B3, Hastalloy C22, Hastalloy C276, Hastalloy X
Titanium :
Grade: Gr1, Gr2, Gr3, Gr5, Gr7, Gr11
Duplex Steel:
Grade: UNS F44, F45, F51, F53, F55, F60, F61
Alloy Steel:
Grade : WP 1, WP 5, WP 9, WP 11, WP 12, WP 22, WP 91
Carbon Steel:
Grade : ASTM A106, A105, A333, A335, A53, A387, A860, A516.

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Quality System, Inspection & Testing

ISO : 9001 : 2015
Approved 3rd party endorsed manufacturing and weld procedures Stringent project quality plans Experienced project engineers well versed in the high requirements.

Testing Services:

  • Hydrostatic Pressure Test
  • X-Ray (Welds)
  • PMI
  • Dye Penetrant Inspection
  • Ultrasonic examination
  • Magnetic Particle Inspection
  • Charpy Impact Testing
  • Hardness Survey
  • Independent 3rd Party Inspection

Typical Documentation Package:

  • Bore Calculations
  • GA Drawing
  • Material Certificate (3.1B, 3,1C)
  • Test Certificates (for ITP items)
  • Weld Procedures
  • PED Statement
  • CE Marking
  • Certificate of Conformity
  • Quality Plan & ITP

Aditya Steel Engg. co. Manufacturer, Stock, Supply and export to :

Saudi Arabia, Bangladesh, United States, UAE, Canada, Angola, Argentina, Austria, Azerbaijan, Pakistan, Peru, Chile, Spain, France, United Kingdom, Indonesia, Israel, Iran, Kuwait, Mexico,Malaysia, Nigeria, Serbia, Singapore, Taiwan, Chile , Venezuela, Ecuador, Netherlands, Brazil, Colombia, Ghana, Iran, Denmark, Poland, Australia, Afghanistan, Bahrain, Costa Rica, Egypt, Iraq, Jordan, South Korea, Kazakhstan, Sri Lanka, Lithuania, Norway, Oman, Philippines, Poland, Qatar, Russia, Vietnam, South Africa, Nigeria Mexico, Turkey, Hungary, Algeria, Belarus, Belgium, Bhutan, Bolivia, Bulgaria,Croatia, Czech Republic, Estonia, Finland,Greece, Italy, Japan, Libya, Romania, Thailand, Trinidad, Tobago,Tunisia, Ukraine, Yemen, Hong Kong, Gabon, China, Portugal, Switzerland, New Zealand, Sweden, Slovakia, Kenya, Lebanon, Morocco, Mongolia, Europe, Japan, Korea, Germany, Spain, China, India
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