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Orifice Plates & Orifice Flange Assemblies

Orifice Plate and Flange Assembly by Gulf Oil and Gas

Precision Differential Flow Measurement Solutions

Gulf Oil & Gas International is a premier global distributor and direct supplier of high-precision Orifice Plates, Restriction Orifice Plates, and Orifice Flange Assemblies. Engineered to perform under severe temperature and high-pressure process conditions, our orifice plates strictly adhere to international quality design codes including ISO 5167, AGA 3, BS 1042, DIN 1952, API, and Miller standards.

Our standard plates are crafted using premium Stainless Steel 316L featuring Raised Face (RF) gasket surfaces accompanied by full 3.1 material test certificates. To meet custom Engineering, Procurement, and Construction (EPC) specifications, we supply plates in specialized metallurgy—including Duplex, Super Duplex, Hastelloy, Monel, Inconel, and Titanium—supporting diverse configurations like Flat Face (FF), Ring Type Joint (RTJ Oval & Octagonal), and paddle tab-handles.

We accommodate expedited fast-track project deliveries across global supply hubs. Every custom plate features precise bore stamping on the extended tag-plate to ensure exact parameters are fed into flow computers for optimal custody transfer and backpressure regulation. Structural integrity and strength calculations are provided to verify line thickness against pressure drop requirements.

Specifications

Class
  • ANSI from 150 thru 2500
Rating
  • Din Nom.pressure from NP10 thru NP100
Size
  • from 1/2” thru 24”, 15mm thru 600mm

Why do we use an orifice plate? These are frequently used for measuring the flow rate of gases and liquids (fluids) through pipelines but can also be used to choke the flow and so limit the throughput.

Orifice plates can be designed and calculated in compliance with any required standard. Our standard orifice plates are manufactured from stainless steel 316L, featuring a gasket surface and accompanied by material certificates 3.1. Additionally, other materials and designs are available, including those conforming to standards such as DIN, JIS, and RTJ, with options for oval, octagonal, or grooved configurations.

We ensure precision by stamping the measured orifice diameter onto the tag plate, enabling accurate use of dimensions in flow computation. Strength calculations can also be provided to verify the plate's thickness against pressure loss.

With a stock of base materials in the most common sizes, competitive pricing and quick delivery times are ensured. For urgent requirements, rush deliveries can be accommodated, often on the same day.

Full Engineering & Custom Supply Capabilities

At Gulf Oil & Gas International, we provide Full Engineering design and supply 100% customized Orifice Plates and Flange Assemblies tailored to your exact process application and operational requirements. Whether your project demands complex multi-stage restriction orifice (RO) sizing to prevent cavitation, custom bore calculations per ISO 5167 / AGA Report No. 3, specialized metallurgy for severe sour gas (H2S) environments, or fast-track emergency project deliveries, our engineering team handles end-to-end design, flow calculation verification, finite strength reporting, and precision supply.

Ordering Data & Engineering Specifications

Design Codes
  • ISO 5167, DIN 1952
  • BS 1042, AGA, API
  • Miller, Spink
  • Customers standard
Type of Plate
  • Square edge
  • Conical entrance
  • Quarter circle
  • Restriction
  • Eccentric & Segmental
  • RTJ interchangeable or integral
Gasket Facing
  • RF, FF
  • RTJ oval
  • RTJ octogonal
  • RTJ-grooves
Materials
  • SS304 / 316 / 316L / 316Ti / 321
  • Monel
  • Duplex / Super Duplex
  • Hastelloy C22, C276
  • Alloy 20
  • Titanium, PTFE

Dimensional Data & Engineering Specifications

Dimensional specifications in mm across ASME Class ratings and DIN Nominal Pressure ratings:

Line size A  
ASME Class DIN Nom. -pressure
150 300 600 900 1500 2500 NP10 NP16 NP25 NP40 NP64 NP100 B C W T
½" 15 48 54 54     53 63 102 32 1.5 0.4
¾" 20 57 67 67     63   102 32 1.5 0.4
1" 25 67 73 73 79   73 84 102 32 1.5 0.4
1¼" 32 76 83 83 88   84 89 102 32 1.5 0.6
1½" 40 86 95 95 98   94 104 102 32 2.0 0.8
2" 50 105 111 111 143 146 107 113 119 102 32 2.5 1.0
2½" 65 124 130 130 165 168 127 138 144 102 32 3.0 1.0
3" 80 137 149 149 168 174 196 142 148 154 102 32 3.0 1.5
4" 100 175 181 194 207 209 235 162 168 174 180 114 38 3.0 1.5
5" 125 197 216 241 248 254 279 192 194 210 217 114 38 3.0 1.5
6" 150 222 251 267 289 282 317 218 224 247 257 114 38 3.0 1.5
8" 200 279 308 321 359 353 387 273 284 290 309 324 127 38 6.0 3.5
10" 250 340 362 400 435 435 476 328 329 340 352 364 391 152 44 6.0 3.5
12" 300 410 422 457 498 520 549 378 384 400 417 424 458 152 44 6.0 3.5
14" 350 451 486 492 521 578   438 444 457 474 486 512 152 44 9.0 6.0
16" 400 514 540 565 575 641   489 495 514 546 543 572 152 44 9.0 6.0
18" 450 549 597 613 637 704               152 51 12.0 8.0
20" 500 606 654 682 697 755   594 617 624 628 657 704 152 51 12.0 8.0
24" 550 717 775 790 837 901   695 734 731 747 764 813 152 51 16.0 10.0

* Larger sizes available on request.

Engineering Profile Diagrams & Edge Configurations

Orifice Plate High-Resolution Dimensional Drawing Profile - Square Edge, Quarter Circle R<T, Quarter Circle R=T, and Conical Entrance Configurations

Drawing Technical Schematic: Detailed dimensional layout showing paddle dimensions (A, B, C, W, T) and edge profiles including Square Edge, Quarter Circle (R<T, R=T), and Conical Entrance.

Industrial Applications of Orifice Plates in Oil and Gas
Target Industry Sectors & Applications

Our orifice plates and flange metering assemblies are engineered for critical industrial applications across energy and manufacturing infrastructure:

  • Upstream Oil & Gas: Offshore platform wellhead flow metering, subsea tie-backs, and gas gathering networks.
  • Refining & Petrochemical: Hydrocracker flow measurement, backpressure control, flare lines, and custody transfer skids.
  • Natural Gas & LNG Processing: High-pressure gas transmission pipelines, cryogenic gas metering, and LNG liquefaction plants.
  • Power Generation: Thermal steam lines, high-pressure boiler feed pump recirculation loops, and geothermal flow control.
  • Water Desalination & Utilities: High-volume seawater intake regulation, potable water transmission metering, and wastewater DP monitoring.

Frequently Asked Questions (FAQ)

Does Gulf Oil & Gas provide full custom engineering support for Orifice Plates?

Yes. Gulf Oil & Gas International delivers end-to-end full engineering services, including precise sizing calculations to ISO 5167 and AGA standards, differential pressure modeling, and custom solutions tailored to your specific fluid medium, line size, and operational pressure.

What specialized materials are available for severe service and sour gas?

We supply orifice plates in exotic alloys including Stainless Steel (316L, 316Ti, 321), Duplex & Super Duplex (2205/2507), Monel 400, Hastelloy C22/C276, Inconel 625, Titanium, and PTFE to resist severe corrosion and sour gas (H2S) environments.

What design standards are used for Orifice Flange Assemblies?

Our products comply with international design codes such as ISO 5167-1 & 2, AGA Report No. 3, API 14.3, BS 1042, DIN 1952, ASME B16.36, and Miller flow codes, accompanied by full 3.1 material test certificates.

Which geographic regions does Gulf Oil & Gas supply?

We export and distribute directly to key industrial hubs across the Middle East (Dubai, Abu Dhabi, Riyadh, Jubail, Doha, Muscat, Kuwait), Africa (Nigeria, Algeria, Egypt, Angola, South Africa), and the CIS region (Kazakhstan, Azerbaijan, Turkmenistan) with fast-track shipping.

Can structural strength and pressure drop reports be generated?

Yes. Every customized plate or restriction orifice assembly can be supplied with complete strength calculations to verify plate thickness against maximum pressure loss and flow velocity.

Do you supply Restriction Orifice (RO) plates for pump protection?

Yes. We supply single-stage and multi-stage Restriction Orifice Plates designed to create controlled backpressure, preventing pump cavitation and maintaining optimal Net Positive Suction Head (NPSH).

We offer both standard and customized solutions for high quality Orifice plate at best price. We are serving Worldwide Clients based in Dubai, United Arab Emirates UAE, Saudi Arabia, Oman, Qatar, Kuwait, Bahrain, Iraq, Kurdistan, Yemen, Lebanon, Jordan, Sudan, Egypt, Nigeria, Algeria, Angola, Kenya, Tanzania, South Africa, Morocco, Libya, Kazakhstan, Armenia, Azerbaijan, Turkmenistan. We are Looking forward to fulfilling your expectations with the best of our product range. Our Excellent Logistics setup supports shipping of goods to major Cities Such As Dubai, Abu Dhabi, Al Ain, Sharjah, Ajman, Ras Al Khaimah, Fujairah, Doha, Muscat, Kuwait, Riyadh, Jeddah, Dhahran, Jubail And Yanbu, Baghdad, Basra, Mosul, Erbil, Sulaymaniyah, Manama, Beirut, Amman, Sanaa, Aden, Mukalla, Khartoum, Abuja, Algiers, Luanda, Nairobi, Dar es salaam, cape town, Durban, Johannesburg, Rabat, Tripoli, Benghazi, Misrata, Ashgabat, Almaty, Aktau, Yerevan, Baku. We will be pleased to serve your requirements with the best of our products.
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