Orifice Flanges to Measure the Fluid Flow Rate (ASME B16.36): Uses, Types, Sizes

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Orifice Flanges to Measure the Fluid Flow Rate (ASME B16.36): Uses, Types, Sizes

ASME B16.36, Special Flanges

An orifice flange is a special type of flange used in piping systems to measure the flow rate of liquids or gases. It is part of an orifice meter setup, which also includes a pair of flanges, an orifice plate, gaskets, and pressure taps. The orifice plate, inserted between the two flanges, has a precisely measured hole through which the fluid flows. The pressure difference is measured before and after the orifice plate using pressure taps that are integrated into the orifice flanges. Orifice flanges are manufactured to ASME B16.36 in multiple sizes and, material grades.

ORIFICE FLANGE

ORIFICE FLANGE DEFINED

What is an Orifice Flange?

An orifice flange is a special type of flange designed for use in measuring the flow rate of fluids through a piping system.

It forms an integral part of an orifice meter, which is a type of flow meter used to determine the velocity of a liquid or gas passing through a pipe. The orifice flange is designed to hold an orifice plate securely in place within the pipeline, creating a restriction through which the fluid flows.

General Assembly and Design

The orifice flange assembly typically consists of a pair of flanges, an orifice plate, gaskets, and bolts. The orifice plate, a thin disk with a precise, centrally located hole, is clamped between the two flanges. This setup is designed to ensure a tight seal and accurate placement of the orifice plate, which is critical for the measurement’s accuracy.

Key Applications

Orifice flanges are used across various industries for fluid measurement, including oil and gas, water treatment, and chemical processing. They are particularly valued for their ability to provide accurate flow measurements without requiring extensive modifications to the existing pipeline.

Standards and Specifications

ASME Specifications for Orifice Flanges:

ASME B16.36 – Orifice Flanges: This standard provides detailed dimensions, tolerances, marking, and material specifications for orifice flanges. It covers flanges in classes 300, 400, 600, 900, 1500, and 2500, accommodating a wide range of operating pressures and temperatures. ASME B16.36 applies to weld neck, slip-on, and threaded orifice flanges, specifying the requirements for flange dimensions, including the diameter of the orifice, bolt circle, and flange thickness, as well as the location and size of pressure-tapping holes.

API Specifications for Orifice Flanges:

While API provides a wide array of standards for various equipment and components used in the oil and gas industry, specific standards directly related to orifice flanges are not as commonly referenced as ASME B16.36. However, API standards that impact the design and use of orifice flanges include:

API 560 – Fired Heaters for General Refinery Service: While not exclusively about orifice flanges, this standard includes considerations for flow measurement and control in the design of fired heaters, where orifice flanges might be utilized.

API 6D – Pipeline Valves: This standard covers the design and specifications of pipeline valves and includes references to auxiliary components (like flanges) that connect valves to the piping system. Though not solely focused on orifice flanges, understanding flange requirements within valve assemblies can be relevant.

Advantages of Orifice Flanges

Accuracy: When installed and calibrated correctly, orifice flanges can provide highly accurate measurements of flow rate.
Durability: Designed to withstand high pressures and temperatures, orifice flanges are suitable for harsh industrial environments.
Versatility: Compatible with a wide range of fluid types and conditions.

Installation Considerations

Proper installation is crucial for the effective operation of an orifice flange. This includes ensuring the orifice plate is centered and aligned correctly, and the pressure taps are appropriately positioned. Regular maintenance and calibration are also necessary to maintain measurement accuracy over time.

In summary, an orifice flange is a key component in the precise measurement of fluid flow within industrial piping systems, offering a reliable method for monitoring and controlling fluid dynamics in various applications.

Material Grades, Dimensions, and Shapes

Orifice flanges are available in all ASTM forged grades (ASTM A105, ASTM A350, ASTM A694, ASTM 182 respectively for carbon, alloy and, stainless steel flanges), dimensions (combinations of nominal sizes and pressure ratings) and, in socket weld, threaded or weld neck shape (WN is the most used). More details about these subjects are given below.

HOW AN ORIFICE FLANGE WORKS

An orifice flange functions as a crucial part of an orifice metering system, which is extensively used to measure the flow rate of fluids in pipelines. This system employs the principle of differential pressure measurement to determine the velocity and volumetric flow rate of the fluid passing through the pipe. Here’s a detailed explanation of how an orifice flange works:

Installation and Setup

The orifice flange is installed in pairs around an orifice plate, which is a precisely machined disk with a sharp-edged hole in the center. This assembly is mounted between two sections of a pipeline. The orifice plate’s diameter is smaller than that of the pipe, creating a constriction in the flow path.

Flow Through the Orifice Plate

As fluid (either liquid or gas) flows through the pipeline, it must pass through the smaller opening of the orifice plate. This causes the fluid to accelerate at the orifice, leading to a decrease in pressure across the plate. The pressure is higher upstream of the orifice plate (at the inlet side) and lower downstream (at the outlet side). This pressure drop is created by the energy conversion that occurs when the fluid’s velocity increases at the constriction, by the Bernoulli Principle.

Pressure Measurement

The orifice flanges are equipped with pressure taps, which are small openings that allow the system to measure the fluid pressure at two points: immediately before and after the orifice plate. These taps are connected to a differential pressure measuring instrument, such as a manometer, pressure transducer, or differential pressure transmitter. The difference in pressure readings, known as the differential pressure, is directly related to the flow rate of the fluid through the pipeline.

Calculating Flow Rate

The flow rate of the fluid can be calculated using the differential pressure measurement along with the orifice plate’s dimensions and the fluid’s properties. The calculation employs a formula derived from the Bernoulli Equation and the Continuity Equation, incorporating factors such as the orifice coefficient (which accounts for losses and deviations from ideal flow conditions) and the fluid density. The result provides an accurate measurement of the fluid’s flow rate through the pipe.

TYPES OF ORIFICE FLANGES

As discussed, orifice flanges are specialized flanges used in conjunction with orifice meters to measure the flow rate of fluids through pipelines. These flanges facilitate the installation of an orifice plate, which is a primary flow element that creates a pressure drop to determine the flow rate.

The design and type of orifice flanges play a crucial role in ensuring accurate measurements, ease of maintenance, and reliable operation of the flow metering system. Here’s an in-depth look at the main types of orifice flanges:

1. Weld Neck Orifice Flanges

Weld neck orifice flanges are characterized by their long, tapered neck that gradually transitions into the diameter of the pipeline. This design provides a strong, durable connection that can withstand high stresses, making weld neck orifice flanges suitable for high-pressure and high-temperature applications.

Features: The neck provides reinforcement that reduces stress concentrations at the base of the flange. The bore of the flange matches the inside diameter of the pipe, ensuring smooth flow and minimizing turbulence at the orifice plate.

Applications: Commonly used in critical and severe service applications where reliability and performance are paramount, such as in petrochemical plants, refineries, and power generation facilities.

2. Slip-On Orifice Flanges

Slip-on orifice flanges are designed to slide over the pipe and then be welded at the flange’s hub to secure it in place. They are simpler in design and lighter in weight compared to weld neck orifice flanges, making them a cost-effective option for lower-pressure applications.

Features: The installation of slip-on flanges is relatively easier due to their simple slip-on design. However, their strength under high pressure and temperature is not as robust as that of weld neck flanges.

Applications: Suitable for moderate conditions where ease of installation and cost are significant considerations, such as water distribution systems and non-critical process lines.

3. Socket Weld Orifice Flanges

Socket weld orifice flanges are intended for smaller pipe diameters and high-pressure applications. The pipe is inserted into the socket end of the flange and welded, providing a smooth bore and enhanced fluid flow.

Features: These flanges offer good strength and are less prone to leakage than slip-on flanges, making them ideal for smaller, high-pressure pipelines.

Applications: Frequently used in chemical processing, small-diameter high-pressure lines, and steam distribution systems.

4. Threaded Orifice Flanges

Threaded orifice flanges, also known as screwed orifice flanges, are designed for applications where welding is not suitable. The pipe threads directly into the flange, facilitating a quick and easy connection without the need for welding.

Features: These flanges can be easily installed and removed, offering a convenient solution for maintenance and assembly. However, their pressure and temperature capabilities are limited compared to welded flanges.

Applications: Ideal for low-pressure and non-critical applications, especially in areas where welding poses safety risks, such as explosive environments.

5. Ring-Type Joint (RTJ) Orifice Flanges

RTJ orifice flanges are used in high-pressure and high-temperature applications. They feature a grooved face that accommodates a metal ring gasket for a tight, leak-proof seal.

Features: The metal ring gasket provides a highly reliable seal under extreme conditions, ensuring the integrity of the flange connection.

Applications: Commonly used in the oil and gas industry, particularly in high-pressure pipelines and offshore platforms.

5. Corner-Tap Orifice Flanges

A corner tap orifice flange is a specific configuration used in the flow measurement of fluids, where the pressure taps are located directly at the orifice plate’s edges.

This arrangement involves positioning the pressure-sensing points immediately upstream and downstream of the orifice plate, essentially at the very corner where the orifice plate and the flange meet.

The corner tap setup is one of several pressure tap configurations used in conjunction with orifice plates and flanges to measure fluid flow through a pipe.

Key Characteristics:

Pressure Tap Placement: The distinctive feature of corner tap orifice flanges is the placement of pressure taps. Unlike flange taps, which are drilled through the flange some distance away from the orifice plate, or vena contracta and pipe taps, which are placed at specific locations along the pipe, corner taps are located at the corners of the orifice plate, providing an immediate pressure differential reading.
Orifice Plate Interface: The pressure taps in a corner tap arrangement closely interface with the orifice plate, intended to measure the pressure drop across the plate accurately.

Applications and Considerations:

Fluid Characteristics: Corner tap orifice flanges are typically used for clean liquids or gases. The proximity of the taps to the orifice plate makes this configuration less suitable for slurries or fluids with particulate matter that might clog the taps.
Measurement Accuracy: The corner tap configuration can offer high accuracy for flow measurement under certain conditions, particularly in smaller pipe sizes where the flow profile is well-developed and predictable.
Installation and Maintenance: Due to their placement, corner taps may be more challenging to install and maintain compared to other tap configurations. It’s crucial to ensure that the taps do not become clogged and that they accurately reflect the pressure differential across the orifice plate.

Advantages and Limitations:

Advantages: Corner taps can provide accurate measurements for certain applications and are particularly effective in systems with well-characterized fluid dynamics and in pipes with smaller diameters.
Limitations: Their application is generally limited by the fluid type and by operational conditions that favor other tap configurations for better accuracy or ease of maintenance. The risk of tap blockage by particulates in the fluid can also be a concern.

Each type of orifice flange serves specific operational needs and applications, offering solutions that balance performance, ease of installation, and cost. Selecting the appropriate orifice flange type is crucial for achieving accurate flow measurements and ensuring the safety and efficiency of piping systems across various industries.

ORIFICE FLANGE DIMENSIONS ASME B16.36

Notes for data shown in tables:

Dimensions are in millimeters (excluding bolts and bolt holes).
Different NPT sizes than 1/2 are available
Bolt lengths for RF flanges include an allowance for orifice and gasket thickness of 6 mm (0.25 in.) for NPS 1 to NPS 12. Bolt lengths for ring-type joint flanges include the allowance of 15 mm (0.62 in.) for NPS 1 to NPS 3.
Bore (B) has to be specified by the buyer
Stud Bolt lengths excl. the height of the chamfers

WELD NECK RF, CLASS 300

NPS	A	R	O	T	H	X	Tg
1	33.4	50.8	125	36.6	81	54	6.4
1½	48.3	73	155	36.6	84	70	6.4
2	60.3	92.1	165	36.6	84	84	6.4
2½	73	104.8	190	36.6	87	100	6.4
3	88.9	127	210	36.6	87	117	9.5
4	114.3	157.2	255	36.6	90	146	12.7
6	168.3	215.9	320	36.6	98	206	12.7
8	219.1	269.9	380	39.7	110	260	12.7
10	273	323.8	445	46.1	116	321	12.7
12	323.8	381	520	49.3	129	375	12.7
14	355.6	412.8	585	52.4	141	425	12.7
16	406.4	469.9	650	55.6	144	483	12.7
18	457	533.4	710	58.8	157	533	12.7
20	508	584.2	775	62	160	587	12.7
24	610	692.2	915	68.3	167	702	12.7

NPS	Bolt Diameter	# Bolts	Bolt holes diameter	Bolts Diameter	Bolts length mm.
1	88.9	4	11/16	5/8	125
1½	114.3	4	13/16	3/4	135
2	127	8	11/16	5/8	125
2½	149.2	8	13/16	3/4	135
3	168.3	8	13/16	3/4	135
4	200	8	13/16	3/4	135
6	269.9	12	7/8	3/4	135
8	330.2	12	1	7/8	145
10	387.4	16	1 1/8	1	165
12	450.8	16	1¼	1 1/8	180
14	514.4	20	1¼	1 1/8	185
16	571.5	20	1 3/8	1¼	195
18	628.6	24	1 3/8	1¼	205
20	685.8	24	1 3/8	1¼	215
24	812.8	24	1 3/8	1½	240

COMMENTS: The height of Raised Face (RF) in CLASS 300 is 2 mm

WELD NECK RF, CLASS 600

NPS	A	R	O	T	H	X	Tg
1	33.5	50.8	125	36.6	81	54	6.4
1½	48.3	73	155	36.6	84	70	6.4
2	60.3	92.1	165	36.6	84	84	6.4
2½	73	104.8	190	36.6	87	100	6.4
3	88.9	127	210	36.6	87	117	9.5
4	114.3	157.2	275	38.1	102	152	12.7
6	168.3	215.9	355	47.7	117	222	12.7
8	219.1	269.9	420	55.6	133	273	12.7
10	273	323.8	510	63.5	152	343	12.7
12	323.8	381	560	66.7	156	400	12.7
14	355.6	412.8	605	69.9	165	432	12.7
16	406.4	469.9	685	76.2	178	495	12.7
18	457.2	533.4	745	82.6	184	546	12.7
20	508	584.2	815	88.9	190	610	12.7
24	609.6	692.2	940	101.6	203	718	12.7

NPS	BOLT CIRCLE DIAM.	BOLTS #	HOLES DIAM.	BOLTS DIAMETER	BOLTS LENGTH
1	88.9	4	11/16	5/8	125
1½	114.3	4	13/16	3/4	135
2	127	8	11/16	5/8	125
2½	149.2	8	13/16	3/4	135
3	168.3	8	13/16	3/4	135
4	215.9	8	1	7/8	150
6	292.1	12	1 1/8	1	180
8	349.2	12	1¼	1 1/8	195
10	431.8	16	1 3/8	1¼	220
12	489	20	1 3/8	1¼	230
14	527	20	1½	1 3/8	240
16	603.2	20	1 5/8	1½	260
18	654	20	1 3/4	1 5/8	280
20	723.9	24	1 3/4	1 5/8	300
24	838.2	24	2	1 5/8	335

COMMENTS: The height of Raised Face (RF) in CLASS 600 is 2 mm at NPS 1 – NPS 3, and 7 mm at NPS 4 – NPS 24.

WELD NECK RF, CLASS 900

NPS	R	O	T	H	X	A	Tg
1	50.8	125	36.6	81	54	33.5	6.4
1½	73	155	36.6	84	70	48.3	6.4
2	92.1	165	36.6	84	84	60.3	6.4
2½	104.8	190	36.6	87	100	73	6.4
3	127	240	38.1	102	127	88.9	9.5
4	157.2	290	44.5	114	159	114.3	12.7
6	215.9	380	55.6	140	235	168.3	12.7
8	269.9	470	63.5	162	298	219.1	12.7
10	323.8	545	69.9	184	368	273	12.7
12	381	610	79.4	200	419	323.8	12.7
14	412.8	640	85.8	213	451	355.6	12.7
16	469.9	705	88.9	216	508	406.4	12.7
18	533.4	785	101.6	229	565	457.2	12.7
20	584.2	855	108	248	622	508	12.7
24	692.2	1040	139.7	292	749	609.6	12.7

NPS	BOLT CIRCLE DIAM.	BOLTS #	HOLES DIAM.	BOLTS DIAMETER	BOLTS LENGTH
1	88.9	4	11/16	5/8	125
1½	114.3	4	13/16	3/4	135
2	127	8	11/16	5/8	125
2½	149.2	8	13/16	3/4	135
3	190.5	8	1	7/8	150
4	235	8	1¼	1 1/8	180
6	317.5	12	1¼	1 1/8	195
8	393.7	12	1½	1 3/8	230
10	469.9	16	1½	1 3/8	240
12	533.4	20	1½	1 3/8	260
14	558.8	20	1 5/8	1½	280
16	616	20	1 3/4	1 5/8	290
18	685.8	20	2	1 7/8	330
20	749.3	20	2 1/8	2	355
24	901.7	20	2 1/8	2½	445

COMMENTS: The height of Raised Face (RF) in CLASS 900 is 7 mm.

WELD NECK RF, CLASS 1500

NPS	R	O	T	H	X	A	Tg
1	50.8	150	38.1	83	52	33.5	6.4
1½	73	180	38.1	89	70	48.3	6.4
2	92.1	215	38.1	102	105	60.3	6.4
2½	104.8	245	41.3	105	124	73	6.4
3	127	265	47.7	117	133	88.9	9.5
4	157.2	310	54	124	162	114.3	12.7
6	215.9	395	82.6	171	229	168.3	12.7
8	269.9	485	92.1	213	292	219.1	12.7
10	323.8	585	108	254	368	273	12.7
12	381	675	123.9	283	451	323.8	12.7
14	412.8	750	133.4	298	495	355.6	12.7
16	469.9	825	146.1	311	552	406.4	12.7
18	533.4	915	162	327	597	457.2	12.7
20	584.2	985	177.8	356	641	508	12.7
24	692.2	1170	203.2	406	762	609.6	12.7

NPS	BOLT CIRCLE DIAM.	BOLTS #	HOLES DIAM.	BOLTS DIAMETER	BOLTS LENGTH
1	101.6	4	1	7/8	150
1½	123.8	4	1 1/8	1¼	160
2	165.1	8	1	7/8	150
2½	190.5	8	1 1/8	1	165
3	203.2	8	1¼	1 1/8	185
4	241.3	8	1 3/8	1¼	205
6	317.5	12	1½	1 3/8	265
8	393.7	12	1 3/4	1 5/8	300
10	482.6	12	2	1 7/8	345
12	571.6	16	2 1/8	2	380
14	635	16	2 3/8	2¼	415
16	704.8	16	2 5/8	2½	450
18	774.7	16	2 7/8	2 3/4	500
20	831.8	16	3 1/8	3	545
24	990.6	16	3 5/8	3½	620

COMMENTS: The height of Raised Face (RF) in CLASS 1500 is 7 mm

WELD NECK RF, CLASS 2500

NPS	R	O	T	H	X	A	Tg
1	50.8	160	38.1	92	57	33.5	6.4
1½	73	205	44.5	111	79	48.3	6.4
2	92.1	235	50.8	127	95	60.3	6.4
2½	104.8	265	57.2	143	114	73	6.4
3	127	305	66.7	168	133	88.9	9.5
4	157.2	355	76.2	190	165	114.3	12.7
6	215.9	485	108	273	235	168.3	12.7
8	269.9	550	127	318	305	219.1	12.7
10	323.8	675	165.1	419	375	273	12.7
12	381	760	184.2	464	441	323.8	12.7

NPS	BOLT CIRCLE DIAM.	BOLTS #	HOLES DIAM.	BOLTS DIAMETER	BOLTS LENGTH
1	108	4	1	7/8	150
1½	146	4	1¼	1 1/8	180
2	171.4	8	1 1/8	1	185
2½	196.8	8	1¼	1 1/8	205
3	228.6	8	1 3/8	1¼	230
4	273	8	1 5/8	1½	260
6	368.3	8	2 1/8	2	350
8	438.2	12	2 1/8	2	385
10	539.8	12	2 5/8	2½	490
12	619.1	12	2 7/8	2 3/4	540

COMMENTS: The height of Raised Face (RF) in CLASS 2500 is 7 mm.

WELD NECK RTJ, CLASS 600

NPS	O	T	H	GROOVE #	P	E
1	125	36.6	81	R16	50.8	6.35
1½	155	36.6	84	R20	68.27	6.35
2	165	36.6	84	R23	82.55	7.92
2½	190	36.6	87	R26	101.6	7.92
3	210	36.6	87	R31	123.83	7.92
4	275	38.1	102	R37	149.23	7.92
6	355	47.7	117	R45	211.12	7.92
8	420	55.6	133	R49	269.88	7.92
10	510	63.5	152	R53	323.85	7.92
12	560	66.7	156	R57	381	7.92
14	605	69.9	165	R61	419.1	7.92
16	685	76.2	178	R65	469.9	7.92
18	745	82.6	184	R69	533.4	7.92
20	815	88.9	190	R73	584.2	9.53
24	940	101.6	203	R77	692.15	11.13

NPS	F	R	W	X	A	Tg
1	8.74	0.8	25.4	54	33.5	6.4
1½	8.74	0.8	25.4	70	48.3	6.4
2	11.91	0.8	27	84	60.3	6.4
2½	11.91	0.8	27	100	73	6.4
3	11.91	0.8	27	117	88.9	9.5
4	11.91	0.8	27	152	114.3	12.7
6	11.91	0.8	27	222	168.3	12.7
8	11.91	0.8	27	273	219.1	12.7
10	11.91	0.8	27	343	273	12.7
12	11.91	0.8	27	400	323.8	12.7
14	11.91	0.8	27	432	355.6	12.7
16	11.91	0.8	30.2	495	406.4	12.7
18	11.91	0.8	30.2	546	457.2	12.7
20	13.49	1.5	31.8	610	508	12.7
24	16.66	1.5	36.5	718	609.6	12.7

WELD NECK RTJ, CLASS 900

NPS	O	T	H	GROOVE #	P	E
1	125	36.6	81	R16	50.8	6.35
1½	155	36.6	84	R20	68.27	6.35
2	165	36.6	84	R23	82.55	7.92
2½	190	36.6	87	R26	101.6	7.92
3	240	38.1	102	R31	123.83	7.92
4	290	44.5	114	R37	149.23	7.92
6	380	55.6	140	R45	211.12	7.92
8	470	63.5	162	R49	269.88	7.92
10	545	69.9	184	R53	323.85	7.92
12	610	79.4	200	R57	381	7.92
14	640	85.8	213	R62	419.1	11.13
16	705	88.9	216	R66	469.9	11.13
18	785	101.6	229	R70	533.4	12.7
20	855	108	248	R74	584.2	12.7
24	1040	139.7	292	R78	692.15	15.88

NPS	F	R	W	X	A	Tg
1	8.74	0.8	25.4	54	33.5	6.4
1½	8.74	0.8	25.4	70	48.3	6.4
2	11.91	0.8	27	84	60.3	6.4
2½	11.91	0.8	27	100	73	6.4
3	11.91	0.8	27	127	88.9	9.5
4	11.91	0.8	27	159	114.3	12.7
6	11.91	0.8	27	235	168.3	12.7
8	11.91	0.8	27	298	219.1	12.7
10	11.91	0.8	27	368	273	12.7
12	11.91	0.8	27	419	323.8	12.7
14	16.66	1.5	33.3	451	355.6	12.7
16	16.66	1.5	36.5	508	406.4	12.7
18	19.84	1.5	39.7	565	457.2	12.7
20	19.84	1.5	39.7	622	508	12.7
24	26.97	2.4	47.6	749	609.6	12.7

WELD NECK RTJ, CLASS 1500

NPS	O	T	H	GROOVE #	P	E
1	150	38.1	83	R16	50.8	6.35
1½	180	38.1	89	R20	68.27	6.35
2	215	38.1	102	R24	95.25	7.92
2½	245	41.3	105	R27	107.95	7.92
3	265	47.7	117	R35	136.53	7.92
4	310	54	124	R39	161.93	7.92
6	395	82.6	171	R46	211.14	9.52
8	485	92.1	213	R50	269.88	11.13
10	585	108	254	R54	323.85	11.13
12	675	123.9	283	R58	381	14.27
14	750	133.4	298	R63	419.1	15.88
16	825	146.1	311	R67	469.9	17.48
18	915	162	327	R71	533.4	17.48
20	985	177.8	356	R75	584.2	17.48
24	1170	203.2	406	R79	692.15	20.62

NPS	F	R	W	X	A	Tg
1	8.74	0.8	25.4	52	33.5	6.4
1½	8.74	0.8	25.4	70	48.3	6.4
2	11.91	0.8	27	105	60.3	6.4
2½	11.91	0.8	27	124	73	6.4
3	11.91	0.8	27	133	88.9	9.5
4	11.91	0.8	27	162	114.3	12.7
6	13.49	1.5	28.6	229	168.3	12.7
8	16.66	1.5	33.3	292	219.1	12.7
10	16.66	1.5	33.3	368	273	12.7
12	23.01	1.5	39.7	451	323.8	12.7
14	26.97	2.4	44.4	495	355.6	12.7
16	30.18	2.4	50.8	552	406.4	12.7
18	30.18	2.4	50.8	597	457.2	12.7
20	33.32	2.4	54	641	508	12.7
24	36.53	2.4	58.7	762	609.6	12.7

WELD NECK RTJ, CLASS 2500 RTJ

2500#	T	H	GROOVE #	P	E
1	160	38.1	92	R18	60.33	6.35
1½	205	44.5	111	R23	82.55	7.92
2	235	50.8	127	R26	101.6	7.92
2½	265	57.2	143	R28	111.13	9.53
3	305	66.7	168	R32	127	9.53
4	355	76.2	190	R38	157.18	11.13
6	485	108	273	R47	228.6	12.7
8	550	127	318	R51	279.4	14.27
10	675	165.1	419	R55	342.9	17.48
12	760	184.2	464	R60	406.4	17.48

2500#	F	R	W	X	A	Tg
1	8.74	0.8	25.4	57	33.5	6.4
1½	11.91	0.8	27	79	48.3	6.4
2	11.91	0.8	27	95	60.3	6.4
2½	13.49	1.5	30.2	114	73	6.4
3	13.49	1.5	30.2	133	88.9	9.5
4	16.66	1.5	33.3	165	114.3	12.7
6	19.84	1.5	36.5	235	168.3	12.7
8	23.01	1.5	39.7	305	219.1	12.7
10	30.18	2.4	47.6	375	273	12.7
12	33.32	2.4	50.8	441	323.8	12.7

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Projectmaterials Team

Blog.projectmaterials.com is an online resource dedicated to providing in-depth information, analysis, and educational content related to the fields of project materials management, engineering, and procurement, particularly within the oil & gas, construction, shipbuilding, energy, and renewable energy sectors. It aims to serve professionals and enthusiasts in these industries by offering valuable insights into materials, equipment, and techniques used in various projects, focusing on the selection, application, and maintenance of these resources. Key features of the blog include: * Educational Articles: Comprehensive posts that cover topics ranging from the technical aspects of piping products (pipes, valves, fittings, flanges, gaskets, bolts, instrumentation) to structural steel and process equipment (including oil extraction systems, drilling rigs, wellheads, pumps, compressors, and separation systems). * Industry Insights: Updates on the latest trends, technologies, and regulatory changes affecting the industries covered. * Guides and How-Tos: Practical advice on selecting the right materials and equipment for specific applications, as well as tips on installation, maintenance, and troubleshooting. * Safety and Standards: Information on safety equipment for production sites, risk mitigation procedures, and an overview of relevant industry standards and regulatory frameworks. The website is designed to support the professional development of engineers, procurement specialists, project managers, and other stakeholders involved in project plant businesses, by disseminating critical know-how and best practices. Whether readers are new to the field or seasoned professionals, blog.projectmaterials.com offers resources to enhance their understanding and performance in managing project materials effectively.

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One Response

Mina medhat says:

March 30, 2023 at 11:17 am

Dear Sir

Good day.
Kindly quote your best price for supplying orifice flange shown in attached file CIF Alexandria, Egypt. Quotation due date Apr 6.

Reply

Orifice Flanges to Measure the Fluid Flow Rate (ASME B16.36): Uses, Types, Sizes

Orifice Flanges to Measure the Fluid Flow Rate (ASME B16.36): Uses, Types, Sizes

ORIFICE FLANGE

ORIFICE FLANGE DEFINED

What is an Orifice Flange?

General Assembly and Design

Key Applications

Standards and Specifications

Advantages of Orifice Flanges

Installation Considerations

Material Grades, Dimensions, and Shapes

HOW AN ORIFICE FLANGE WORKS

Installation and Setup

Flow Through the Orifice Plate

Pressure Measurement

Calculating Flow Rate

TYPES OF ORIFICE FLANGES

1. Weld Neck Orifice Flanges

2. Slip-On Orifice Flanges

3. Socket Weld Orifice Flanges

4. Threaded Orifice Flanges

5. Ring-Type Joint (RTJ) Orifice Flanges

5. Corner-Tap Orifice Flanges

ORIFICE FLANGE DIMENSIONS ASME B16.36

WELD NECK RF, CLASS 300

WELD NECK RF, CLASS 600

WELD NECK RF, CLASS 900

WELD NECK RF, CLASS 1500

WELD NECK RF, CLASS 2500

WELD NECK RTJ, CLASS 600

WELD NECK RTJ, CLASS 900

WELD NECK RTJ, CLASS 1500

WELD NECK RTJ, CLASS 2500 RTJ

Projectmaterials Team

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