ABB Restriction orifice plates FPD190

Overview

The ABB FPD190 restriction orifice plate is a fundamentally different device from a measuring orifice plate like the FPD150. Its purpose is not to measure flow but to deliberately reduce line pressure or limit flow rate to a target value, protecting downstream equipment and piping from a pressure the system was not designed to see.

Seven Star LLC engineers and supplies the FPD190 as a trusted supplier of ABB products in Oman and the GCC, sizing the bore – or the number of bores in a multi-stage stack – to the exact pressure drop each customer’s process requires.

Operating Principle

A restriction plate works on the same differential-pressure physics as a measuring orifice plate – fluid accelerating through a bore drops in static pressure – but here the bore is sized purely to dissipate a required amount of pressure energy, not to produce a signal for a transmitter. In the single-plate CRN configuration, one calculated bore does the job; where the required pressure drop is too large for a single plate to achieve safely, or would generate excessive noise or cavitation across one restriction, the M-CRN multi-restriction spool stacks several plates in series so the pressure is stepped down gradually.

Distributing the pressure drop across multiple stages in an M-CRN assembly reduces the risk of cavitation damage and audible noise that a single, highly restrictive bore would otherwise produce.

Engineering Design of the FPD190

Each plate’s bore diameter and thickness are calculated specifically for the required pressure reduction or flow restriction while maintaining structural integrity of the plate under the resulting pressure differential – an under-designed restriction plate can deform or fail under sustained high differential pressure, so plate thickness is not a generic figure but an engineered value per application. Sizing follows the R.W. Miller method as standard, with noise calculations to IEC 60534-8-3 and IEC 60534-8-4 to keep acoustic and vibration levels within safe limits, and the design complies with the EU Pressure Equipment Directive and ISO 9001/14001 quality management standards. Plates are manufactured in standard thicknesses of 3, 6, or 10 mm, with alternatives from 1.5 mm to 16 mm, and cover pipeline sizes from DN15 to DN900 (½ to 36 inches) across three configurations: a single concentric plate, a single multi-hole plate for a more gradual pressure step, and a multi-stage M-CRN assembly for the largest pressure drops.

The FPD190 is supplied in a wide range of materials to suit the process fluid and pressure class, and is available for both liquid and gas service where a controlled, fixed pressure letdown is preferable to a control valve – typically where the pressure reduction requirement is constant rather than variable. Multi-hole and multi-stage configurations are specified whenever a single-plate restriction would otherwise generate excessive noise or cavitation, both of which accelerate erosion damage to the downstream pipe wall and shorten the plate’s service life.

Key Features

• Purpose-built for pressure reduction or flow restriction, not flow measurement
• Single-stage CRN design for straightforward restriction requirements
• Multi-stage M-CRN spool for large pressure drops that a single plate cannot safely achieve
• Bore and thickness individually calculated for the specified pressure drop
• Reduces cavitation and noise by stepping the pressure drop across multiple stages
• Wide range of available materials for varied process conditions – 316/316L stainless steel as standard, with 304/310/321 stainless, CrMo, duplex/super duplex, and nickel alloys (400/625/800/825/C276) or titanium available
• Flange ratings from ASME Class 150 through 2500 lb. and DIN PN6 through PN160
• Suitable for both liquid and gas restriction duty
• A lower-maintenance, no-moving-parts alternative to a control valve for fixed pressure letdown

Industrial Applications

The FPD190 is used in chemical processing, oil and gas, and water treatment plants across Muscat, Sohar, Salalah, and the wider GCC wherever a line needs a fixed, reliable pressure reduction ahead of a pressure-sensitive instrument, vessel, or downstream pipe rating – pressure relief system tailpipes and let-down stations among them.

Seven Star LLC, as a trusted ABB supplier, calculates and supplies the correct single- or multi-stage FPD190 configuration for the customer’s specific upstream and downstream pressure conditions rather than offering a generic off-the-shelf bore size.

Technical Specifications

FPD190 Product Design Codes and Ordering Data

ABB identifies each FPD190 by a product design code. R1 is a restriction plate only, R2 and R3 are restriction plates with an integral RTJ carrier in counter-bore or solid form, R4 is a multi-stage restriction assembly and R5 is a single-stage multi-hole plate. A second code states the design standard: ABB standard, Aramco standard or Shell standard. The orifice design is always given as a restriction plate without tappings, because the device is not connected to a differential pressure transmitter.

The remaining code positions define the line nominal bore, pipe schedule, pipe and element material, plate thickness, flange type and flange rating. Listed bore codes run from DN 15 (1/2 in.) to DN 1050 (42 in.), and schedules from 5S to XXS. Flange types cover raised face, oval or octagonal RTJ and two flat-face versions. Options include a drain hole for gas service or a vent hole for liquid service in sizes from 1 mm to 1/2 in., oxygen cleaning, and impact testing at -46 °C or -196 °C.

Testing and Certification Options

Documentation can be matched to the project. ABB lists material certificates to BS EN 10204 3.1 B or 3.1 C, NACE MR0175 and MR0103 material conformity, positive material identification and a 100% dimensional check as order options, with a hardness survey and impact testing also available. Bore calculations and noise calculations can be supplied with the plate. Plates are normally delivered with a data tab welded to the circumference and engraved with details such as tag number and bore size, so the plate can be identified without removing it from the line.

Request a Quote for ABB Restriction orifice plates FPD190

Contact Seven Star LLC to have an ABB FPD190 restriction orifice plate or multi-stage M-CRN assembly engineered for your pressure reduction requirement in Oman and the GCC. As a trusted supplier of ABB products, we provide correctly sized plates with full material traceability, noise and cavitation calculations, and documentation aligned to ISO 9001/14001 and the applicable pressure equipment directive.

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