Nuflo Orifice Plates

7/21/2019 Nuflo Orifice Plates

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TECHNICAL SPECIFICATIONS

NUFLO Orifice Platesfor Flow Measurement and Flow Restriction

Cameron has decades of experience designing, sizing, and

manufacturing orifice equipment using Computational Fluid

Dynamics (CFS) techniques and other design tools. Cameron

has manufactured measurement orifice plates and restriction

orifice plates under the NUFLO brand, and through the

collaboration of its Measurement Systems and Flow Control

divisions, Cameron’s restriction design capabilities include the

design of multi-orifice/multi-chamber chokes for regulating

flow from high-pressure oil and gas wellheads.

Cameron also offers multiple “holders” for orifice plates.

These include holders that fit in or between ring joint flanges

orifice holding blocks, and single and dual orifice fittings.

Plate Styles

Cameron’s plate styles include:

• Type 500 – A universal plate for use in orifice fittings

and Type 580 and 590 ring-joint flange plate holders.

See Universal Orifice Plates, page 2.

• Type 520 – A paddle-type plate for use with raised-face

orifice flange unions for measurement applications or for

installation between standard ANSI flanges in restriction

applications. Special options for flat-face flanges with

full-face contact are also available. See Paddle Type

Orifice Plates, page 3.

Cameron’s NUFLO™ orifice plates are one of the most popular

devices for the measurement and control of fluid flow. The

shape and manufacturing tolerances of plates used in

measurement applications are defined in the international

standardization publications of ISO, AGA, ASME, and others.

From the formulas and data within these publications, the

relationships and values of flow, differential pressure, and plate

bore are determined.

In flow control applications, orifice plates are used as restriction

devices to regulate fluid flow or reduce the flowing pressure

downstream of the orifice plate. The use of a fixed restriction

orifice can be beneficial and economic by reducing the

demands on other flow system components.

Unlike measurement orifices, the sizing and design of

restriction orifices are not defined by standardization

organizations. Additionally, restriction orifices are often

exposed to severe flow conditions associated with large

pressure reductions and the related fluid conditions caused by

liquids flashing to a gas, cavitation, and sonic (choked) flow. In

torturous applications, mimicking the design of measurement

orifices is not sufficient. Rather, Cameron’s NUFLO orifice plates

offer a variety of solutions involving alternate designs for the

leading edge of the bore, increased plate thickness, alternate

materials of construction, and multi-stage assemblies

embedded with specifically sized orifices.



2

Bore Designs

The bore in the orifice plate can be shaped or positioned to create

advantages for specific measurement applications. Likewise, the

bore design can be customized to enhance the performance of

flow restriction plates. See Special Restriction Orifice Bores, page 5,

for illustrations and detailed descriptions of each bore design.

Restriction plates can be challenging to engineer due to the

extreme conditions to which they are subjected. In applications

where a measurement plate is inadequate, a “thick” restriction

plate or a multi-stage plate may be the answer. A thick plate is as

thick as the diameter of the bore. In large diameter applications,

the appearance is similar to a wafer meter. Where extreme

velocities exist, a thick plate better resists supersonic velocity

and erosion. In installations where high sound levels or reduced

durability should be avoided, a series of orifices can be used. Each

orifice is specifically sized and factory installed in a pipe section,which is supplied as a spool assembly.

Orifice Sizing

Customers also rely on Cameron for expert sizing of orifice

applications. Cameron offers free quotations for measurement

and restriction orifice plates and provides bore dimensions

or calculation results for a nominal charge. The screen image

below shows calculations for a multi-stage orifice assembly. All

calculations are provided for advisement purposes only.

When sizing a restriction orifice plate, it is important to remember

that the orifice plate is a fixed opening that is selected based on

only one set of conditions. Therefore, when a range of conditions

is provided, a determination must be made as to which single

set of conditions should be used for the sizing. Upon request, a

“what-if” analysis for testing the effectiveness of the plate with

other flow conditions can be performed once sizing is completed.

Design Specifications

NUFLO orifice plates offer the following features, options, and

capabilities:

• Edges – Square and sharp, measurement plates will not

reflect a beam of light when viewed without magnification.

Non-counter-bored plates are available on request for bi-

directional flow measurement or for restriction applications at

no additional charge.

• Finish – 20 micro-inch roughness. Polish technique is variable.

Other or specific finishes are optional. Restriction plates may

not be polished.

• Flatness – Measurement plates are flat within 0.010 of an inch

per inch of dam height (dam height = pipe diameter minus orifice

diameter, divided by 2).

• Material Grade – 316 stainless steel. Other alloys are optional.

• CRN – All plates and the ring joint flange plate holder have a

Canadian Registration Number confirming compliance with

ASME B16.48 and other piping codes. All NUFLO orifice plates

are traceable to a mill test report.

• Markings – All plates are marked with the line size, material

of construction, bore size, reference temperature, and heat lot

number. As an option, the customer’s tag information can also

be included.

• Plate Size and Thickness – Orifice plates are available in line

sizes from 1/2" to 24"; standard line sizes, from 2" to 12",

are commonly available in both 1/8" and 1/4" thicknesses.

Restriction plates are offered in various thicknesses according

to calculation results based on line size, bore size, pressure

drop, material, and flowing temperature.

• Vent or Drain Holes – Vent or drain holes are an option.

Customers must specify diameter and location or pipe schedule.

Universal Orifice Plates

Type 500

The Type 500 orifice plate is a standard design used in most

brands of single and dual chamber orifice fittings. Non-NUFLO

brand dual chamber fittings may require a seal ring.

Type 500 plates also fit Type 580 and Type 590 ring joint orifice

plate holders. When ordering, please specify:

1. Type number

2. Line size

3. Plate OD (Dimension A) if not as listed on page 3

4. Material

5. Plate thickness (Dimension B) if not as listed on page 3

6. Orifice bore type



Paddle Type Orifice Plates

Type 520

NUFLO Type 520 orifice plates are used with raised-face orifice flange

unions for measurement applications and installed between standard

ANSI flanges for restriction applications. Cameron also supplies

special versions for installation between flat-face flanges with

full-face contact.

The plate and handle are a one-piece seamless design on 1/8" thick

orifice plates for line sizes 2" to 6" and ANSI classes less than 900.

On all other plates, the handle is welded to the plate as standard;

one-piece construction is available as an option. The flange ANSI

class and other standard information is stamped on the handle. Each

handle includes a hole as indicated in the table below.

When ordering, please specify:

1. Type number

2. Line size and ANSI class

3. Plate OD (Dimension A) if not as listed

4. Material

5. Plate thickness (Dimension B) if not as listed


7. Measurement type or restriction type (no bevel or polish)

8. Any special requirements

Type 500 Dimensions

Diameter of bore to bespecified by purchaser

B

A Dia.

FLOW

LineSize1

PlateODA

PlateThickness2

B

BlankWeight3

(lb)

3/4 1.125 1/8 0.06

1 1.312 1/8 0.06

1-1/2 2.000 1/8 0.11

2 2.437 1/8 0.17

2-1/2 2.812 1/8 0.25

3 3.437 1/8 0.34

4 4.406 1/8 0.55

6 6.437 1/8 1.18

8 8.437 1/4 4.06

10 10.687 1/4 6.41

12 12.593 1/4 9.61

1 All dimensions in inches.2 Other thicknesses available.3 Weight for thickness shown.

Diameter of bore to bespecified by purchaser

D

B

A Dia.

C

FLOW

Line Size Handle Hole Diameter

1/2 to 2 1/4

2-1/2 to 12 3/8

14 to 24 1/2

All dimensions in inches.



4

Measurement Orifice Bore Profiles

Square Edge (Standard) Bore

For the common square edge concentric bore orifice, the bore and

bevel is the standard method of limiting the plate edge thickness.

Unless otherwise specified, plates will be beveled to the current

accepted AGA standards.

Quadrant Edge Bore

The quadrant edge bore is an orifice with the inlet edge rounded.

Instead of beveling, the plate is counter-bored to the desired edgethickness. The radius of the quarter circle bore is a function of

the orifice-to-pipe ratio (d/D). Thickness at the throat is equal to

the radius. This bore is specifically designed for viscous fluids such

as heavy crudes, syrups, and slurries with Reynolds Numbers

below 100,000.

Type 520 Dimensions

Line Size

125 lb& 150 lb

ANSI

250 lb& 300 lb

ANSI

400 lbANSI

600 lbANSI

900 lbANSI

1500 lbANSI

2500 lbANSI

For AllPressure Ratings

125 to 2500 lb ANSI

A A A A A A A B C D

1/2 1-7/8 2-1/8 2-1/8 2-1/8 2-1/2 2-1/2 2-3/4 1/8 4 1

3/4 2-1/4 2-5/8 2-5/8 2-5/8 2-3/4 2-3/4 3 1/8 4 1

1 2-5/8 2-7/8 2-7/8 2-7/8 3-1/8 3-1/8 3-3/8 1/8 4 1

1-1/4 3 3-1/4 3-1/4 3-1/4 3-1/2 3-1/2 4-1/8 1/8 4 1

1-1/2 3-3/8 3-3/4 3-3/4 3-3/4 3-7/8 3-7/8 4-5/8 1/8 4 1

2 4-1/8 4-3/8 4-3/8 4-3/8 5-5/8 5-5/8 5-3/4 1/8 4 1

2-1/2 4-7/8 5-1/8 5-1/8 5-1/8 6-1/2 6-1/2 6-5/8 1/8 4 1-1/4

3 5-3/8 5-7/8 5-7/8 5-7/8 6-5/8 6-7/8 7-3/4 1/8 4 1-1/4

4 6-7/8 7-1/8 7 7-5/8 8-1/8 8-1/4 9-1/4 1/8 4 1-1/4

5 7-3/4 8-1/2 8-3/8 9-1/2 9-3/4 10 11 1/8 5 1-1/2

6 8-3/4 9-7/8 9-3/4 10-1/2 11-3/8 11-1/8 12-1/2 1/8 5 1-1/2

8 11 12-1/8 12 12-5/8 14-1/8 13-7/8 15-1/4 1/8 5 1-1/2

10 13-3/8 14-1/4 14-1/8 15-3/4 17-1/8 17-/18 18-3/4 1/4 6 1-1/2

12 16-1/8 16-5/8 16-1/2 18 19-5/8 20-1/2 21-5/8 1/4 6 1-1/2

14 17-3/4 19-1/8 19 19-3/8 20-1/2 22-3/4 n/a 1/4 6 1-1/2

16 20-1/4 21-1/4 21-1/8 22-1/4 22-5/8 25-1/4 n/a 3/8 6 1-1/2

18 21-1/2 23-3/8 23-1/4 24 25 27-5/8 n/a 3/8 6 1-1/2

20 23-3/4 25-5/8 25-3/8 26-3/4 27-3/8 29-5/8 n/a 3/8 6 1-1/2

22 26 27-3/4 27-1/2 28-7/8 n/a n/a n/a 3/8 6 1-1/2

24 28-1/8 30-3/8 30-1/8 31 32-7/8 35-1/2 n/a 3/8 6 1-1/2

All dimensions in inches.

D d

R = d 0.734

1 4

0.638

min 1/8" thick

R 45 ϒ

c =1.5 d but less than D

c

D d



Eccentric Bore

Eccentric bore orifice plates are plates with the orifice off-center, or

eccentric, as opposed to concentric. The bore of the eccentric

orifice normally is inscribed in a circle that is 98% of the pipediameter, so that solids or slurries may pass through. Eccentric bore

orifice plates are used in many industries including heavy and light

chemicals, steel, paper, nuclear, and petrochemicals.

Conical Reverse Bevel Restriction Bore

The conical orifice is a measurement orifice installed in the flow line

with the bevel facing upstream. It is applied in low Reynolds Number

applications. Due to reduced machining, this style is more economical

than the quadrant bore typically used for measurement of viscous

fluids, and is sufficiently accurate for most restriction applications.

Some restriction applications are designed with the assumption that

the fluids will reach sonic velocity through the bore of the restriction

(critical flow). It is more predictable to achieve sonic velocity through

the bore of a thick plate, and a thick plate can withstand the

mechanical wear associated with sonic velocity.

Special Restriction Orifice Bores

Quadrant Edge Bore Thin Restriction Bore

D d

Tap angle

D

d

180 ϒ

90 ϒ

D d

small D D > 2"

d d

dD

In a restriction application the thin plate is advantageous over the

thick plate in situations where the bore would be large. Since the

thick plate requires the thickness of the plate and the bore to be

equal the thin plate alternative will be lighter, easier to handle, and

less expensive. Although the thin plate may be less durable than a

thick plate they are suitable for most applications. Attention should

be paid when sizing thick versus thin plates as the sizing results will

differ between the two styles. To avoid thin plate acting like a thick

plate a bevel may be incorporated during manufacture to reducethe thickness through the bore cylindrical to at least one third the

thickness of the plate.

As a rugged economical device a restriction plate does not require

the same stringent machining tolerances and surface finish as a

measurement plate.



6

Multi-Stage Restriction Assembly

A multi-stage restriction assembly reduces the flowing pressure in stages as a means of reducing noise pollution or improving the durability

of the restriction element. Flow is kept subsonic and non-cavitating at each stage by adding stages. Each assembly is custom engineered by

Cameron for specific operating parameters. These assemblies are commonly used in “blowdown” applications in which gases are vented to

atmospheric pressure with minimal emitted sound. Each plate is typically held between standard ANSI flanges (not shown).

Cameron offers the Type 560 orifice plate to holders that fit between

ring joint flanges.

In conformance with ASME B16.2, Type 560 plate holders feature an

oval gasket ring. Octagonal rings are available on request. Standard

materials are carbon steel and 316 stainless steel; however, NUFLO

plate holders can be manufactured from nearly any alloy.

Type 560 plate holders are available in all sizes and ring numbers.

Please note that 2" to 12" sizes have 1/4" thick plates as standard; for

restriction applications additional thickness may be required. Confer

with sizing results. Additional thickness will increase the Approx. Gap

shown on page 7.

Other sizes, materials, ANSI, and special flange ratings are available on

special order.

When ordering, please specify:

1. Type number

2. Line size

3. API ring number or ANSI flange pressure rating

4. Material

5. Quantity


7. Plate thickness (inches)

8. Measurement or restriction application

Orifice Plate Alloys Available

304 321 Hastelloy B, C

316 347 Inconel 600

316 L Duplex Inconel 625

317 Monel

d

D

4D

Ring Joint Orifice Plate Holders

Other materials available on request.



Orifice Plates for RTJ Flanges

300 – 600 lb ANSI 900 lb ANSI 1500 lb ANSI 2500 lb ANSI

LineSize

APIRing #

A B Approx.

Gap*API

Ring # A B

Approx.Gap*

APIRing #

A B Approx.

Gap*API

Ring # A B

ApproxGap*

1/2 R-11 29/32 4-1/4 19/32 R-12 1 4-1/4 19/32 R-12 1 4-1/4 19/32 R-13 1 4-1/4 19/32

3/4 R-13 1 4-1/4 19/32 R-14 1 4-1/4 19/32 R-14 1 4-1/4 19/32 R-16 1 4-1/4 19/32

1 R-16 1 4-1/4 19/32 R-16 1 4-1/4 19/32 R-16 1 4-1/4 19/32 R-18 1 4-1/4 19/32

1-1/2 R-20 1 4-1/4 19/32 R-20 1 4-1/4 19/32 R-20 1 4-1/4 19/32 R-23 1-1/16 5-1/4 1/2

2 R-23 1-1/16 4-1/4 23/32 R-24 1-1/16 5-1/4 3/4 R-24 1-1/16 5-1/4 5/8 R-26 1-1/16 5-1/4 5/8

2-1/2 R-26 1-1/16 5-1/4 23/32 R-27 1-1/16 5-1/4 3/4 R-27 1-1/16 5-1/4 5/8 R-28 1-13/16 5-1/4 11/16

3 R-31 1-1/16 5-1/4 23/32 R-31 1-1/16 5-1/4 21/32 R-35 1-1/16 5-1/4 5/8 R-32 1-3/16 6-1/4 11/16

3-1/2 R-34 1-1/16 4-1/4 23/32 n/a n/a n/a 21/32 n/a n/a n/a 5/8 n/a n/a n/a n/a

4 R-37 1-1/16 5-1/4 23/32 R-37 1-1/16 5-1/4 21/32 R-39 1-1/16 5-1/4 5/8 R-38 1-5/16 6-1/4 21/32

5 R-41 1-1/16 6-1/4 23/32 R-41 1-1/16 6-1/4 21/32 R-44 1-1/16 6-1/4 5/8 R-42 1-7/16 7-1/4 21/32

6 R-45 1-1/16 6-1/4 23/32 R-45 1-1/16 6-1/4 21/32 R-46 1-3/16 6-1/4 11/16 R-47 1-7/16 7-1/4 21/32

8 R-49 1-1/16 6-1/4 23/32 R-49 1-1/16 6-1/4 21/32 R-50 1-35/16 6-1/4 11/16 R-51 1-9/16 8-1/4 3/4

10 R-53 1-3/16 7-1/4 23/32 R-53 1-3/16 7-1/4 21/32 R-54 1-7/16 7-1/4 23/32 R-55 2 8-1/4 7/8

12 R-57 1-3/16 7-1/4 23/32 R-57 1-3/16 7-1/4 21/32 R-58 1-11/16 8-1/4 3/4 R-60 2-1/8 9-1/4 7/8

14 R-61 1-3/16 7-1/4 23/32 R-62 1-7/16 7-1/4 23/32 R-63 1-7/8 8-1/4 25/32 n/a n/a n/a n/a

16 R-65 1-5/16 7-1/4 23/32 R-66 1-9/16 7-1/4 27/32 R-67 2-1/8 9-1/4 1 n/a n/a n/a n/a

18 R-69 1-5/16 7-1/4 23/32 R-70 1-11/16 7-1/4 3/4 R-71 2-1/8 9-1/4 1 n/a n/a n/a n/a

20 R-73 1-3/8 7-1/4 23/32 R-74 1-9/16 7-1/4 3/4 R-75 2-1/8 10-1/4 7/8 n/a n/a n/a n/a

24 R-77 1-7/16 7-1/4 13/16 R-78 1-7/8 9-1/4 25/32 R-79 2-5/16 11-1/4 1 n/a n/a n/a n/a

All dimensions in inches.* Approximate distance between flanges.

2"

1-1/4"

Type 560

Integral Plate Seal

i i li

"

"

A

1/8""

B

Single and Dual Orifice Chamber Fittings

Orifice fittings provide an alternative to holding an orifice plate between flanges.They allow for easier and faster inspection or replacement of the orifice plate.

Measurement accuracy is assured by centering the orifice plate in the pipe bore.

A dual chamber fitting allows the plate to be changed without depressurizing

the flow line or interrupting the flow. Fittings are available for line sizes ranging

from 2" to 6". See NUFLO Single and Dual Orifice Fit ting Models 4055 and 4042

and CLIF MOCK™ Model 5030 Orifice Fitting technical data sheets and related

accessory data sheets for details.

Disclaimer: This information is being provided for marketing purposes only.

Exact specifications should be confirmed with the factory at time of order.



© 2014 Cameron | CLIF MOCK and NUFLO are trademarks of Cameron | SWP 2M 09/14 AD01221M

www.c-a-m.com/measurement

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Nuflo Orifice Plates