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The Best Flange Manufacture!

 

 

Tianjin baode steel co.,ltd we mainly produce seamless steel pipes, erw steel pipes,lsaw steel pipe and ssaw steel pipe,stainless steel, alloy steel elbows, tees, reducers, flanges and other pipe fittings.

 

Why Choose Us

Product Application

Pipe fittings are widely used in pipeline connections in industries such as chemical, petroleum, power, and steam.

Our Certificate

ISO9001,ISO14001,ISO45001,AAA Credit Enterprise.

Production Market

Our company's pipe fittings are exported to more than 40 countries and regions including North America, South America, Southeast Asia, the Middle East, and Africa, and have received unanimous praise from domestic and foreign customers.

Our Service

Product explanation, answering questions, providing solutions, product quotation. Update production progress in a timely manner, provide multiple payment methods, logistics delivery. Shipping schedule updates, pre arrival reminders, customer follow-up tracking services.

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Flange Types Overview
 

Flange Type

NPS (inch)

ASME Class

Faces

Joint Integrity

Weld

ASME Standards

Welding Neck Flange

All

All

All

High

One butt weld.

B16.5, B31.3

Slip-on Flange

Many

Generally, ≤ 600

FF, RF

Medium

One or two fillet welds.

B16.5, B31.3

Socket Weld Flange

Generally,
≤ ½ to 2.

Max ≤ 4

≤ 600

FF, RF

Medium

One fillet weld.

B16.5, B31.3

Lap Joint Ring Flange

Not used for small sizes.

NA

FF

NA

None

B16.5, B31.3

Stub End of Lap Joint Flange

150 to 2500

FF, RF, RTJ

High

One butt weld.

B16.9, B31.3

Threaded Flange

Generally,
≤ ½ to 2.

Max ≤ 4

≤ 300

FF, RF

Low

None

B1.20.1, B31.3

Blind Flange

All

All

All

NA

None

B16.5, B31.3

 

 

 
Flange Specification and Identification
 
01/

Type and Facing. The flange is specified according to whether it is, for example, ‘‘weld-neck RTJ’’ or ‘‘socket-weld RF.’’ Ring joint facing and RTJ gasket dimensions for ASME B16.5.

02/

Nominal Pipe Size (NPS). This is a dimensionless designation to define the nominal pipe size (NPS) of the connecting pipe, fitting, or nozzle. Examples include NPS 4 and NPS 6.

03/

Flange Pressure Class. This designates the pressure temperature rating of the flange, which is required for all flanges. Examples include Classes 150, 300, 900, and 1500.

04/

Standard. Basic flange dimensions for ASME B16.5. Examples include ASME B16.5, BS 1560, DIN or API 6A.

05/

Material. A material specification for flanges must be specified and be compatible to the piping material specifications.

06/

Pipe Schedule. This is only for WN, composite lap-joint and swivel-ring flanges where the flange bore must match that of the pipe, such as schedule 40, 80, 120, and 160.

 

What are the 5 basic flange face finishes

 

The stock flange finish

The stock flange finish is a continuous groove produced by using a 1/16” Radius round nosed tool with a feed of 1/32” Per revolution.
This is the standard flange finish unless otherwise specified by the purchaser.

01

The spiral serrated finish

The spiral serrated finish is also a continuous groove like the standard stock finish in that the groove is generated with a 90° included angle “v” Tool. The groove is 1/64″ deep and the feed is 1/32″ for all sizes.

02

The concentric serrated finish

As the name suggests this surface finish is made up of concentric grooves. A 90° included angle “v” Tool is used and the grooves are 1/64″ deep and 1/32″ apart.

03

The smooth finish

The smooth finish can be produced using several different shaped tools. This finish shows no visible serrations and has a 63-125 aa. This finish in the past was commonly known as “smooth plane.” This term, however, should be avoided as it can be confused with “flat faced” Which applies to the flange facing and not to the gasket surface finish.

04

The cold water finish

The cold water finish is made by using a wide tool at high speed, it has a mirror like appearance and this finish is generally used without a gasket with a 32-62 aa.

05

 

Inspection standards and methods for flanges
A105 WNRF Flange
 

Flange inspection standards:

1. International standards: Including ISO, DIN, ANSI/ASME, JIS and other standards.
2. Industry standards: Including petrochemical, electric power, steel, mining and other industry standards.
3. National standards: Including GB, JB, HG and other standards.

A105 WNRF Flange
 

Flange inspection items:

1. Dimensional inspection: Including inspection of dimensional parameters such as the inner diameter, outer diameter, and thickness of the flange.
2. Compatibility test: Test the compatibility of flange connection materials to ensure that there will be no corrosion or oxidation reaction between the connection parts.
3. Friction coefficient inspection: Check whether the friction coefficient between flange connectors meets the standard requirements.
4. Leak detection inspection: Check whether there is leakage in the flange connection to ensure safety and reliability.

A105 WNRF Flange
 

Flange inspection method:

1. Visual inspection method: Visually inspect the flange connections for surface defects, oxidation, deformation, etc.
2. Metrological inspection method: Use measuring tools to detect various dimensions of flange connections.
3. Mechanical property testing method: Including testing of mechanical properties such as tensile, impact, hardness, etc.
4. Leak detection method: Leak detection of flange connectors through various leak detection methods.

 

 

 

Flange Attachment Methods and Applications

Flanges can be welded or screwed on, depending on the type of flange and the piping system specifications. When choosing a flange type, consider pressure capability, pipe size, and intended application.
Ring or slip-on flanges feature a central hole and slide onto the pipe end. The flange face extends beyond the pipe end and will be welded into place.
Ring or slip-on flanges feature a central hole and slide onto the pipe end. The flange face extends beyond the pipe end and will be welded into place.
Socket weld flanges are designed for tiny, high-pressure applications. The pipe is placed into one end, and a fillet weld is done to the exterior of the flange. To reduce weld stress, an expansion gap is necessary between the flange and the pipe.
Weld neck flanges have a long, tapered hub that provides strength and enhanced stress distribution for use in high-pressure, sub-zero, or elevated-temperature environments.
Blind flanges are flat, without a bore, and are used to complete a piping system.
Lap-joint flanges are similar to slip-on flanges, but they are used in combination, meaning that the flange does not come into touch with the medium in the pipe. These flanges do not require welding, thus they can spin freely to align with the matching flange.
Threaded flanges are commonly used for smaller pipe sizes and do not require welding, making them a practical choice; nevertheless, they are not appropriate for piping systems with thin walls.

RF Blind Flanges

 

Threaded Welded Flange

 

Packaging, Freight And Transportation

We transport our finished products by road, rail, sea and air. Our packaging is conducted as per the customer requirements and we undertake procedures such as application of vapour corrosion inhibitor, silica gel packs and corrosion resistant oil as per customer requirements. We also undertake fumigation of wooden boxes as per ISPM-15 (for cases which are being sent to our overseas customers). Our packaging facility has the ability to dispatch more than 250 containers per month and has the capacity to handle consignments of sizes up to 24 meters x 5.5 meters x 4.5 meters.
We sell some of our products on a cost, insurance and freight basis, on a consignee basis and on a door delivery basis.we may have to pay for transportation costs in relation to the delivery of some of the raw materials and other inputs to our Manufacturing Facilities. We do not own any vehicles for the transportation of our products and raw materials; we therefore rely on third party transportation and logistics providers for delivery of our raw materials and products.we do not have any long-term contractual arrangements with such third-party transportation and logistics providers. Disruptions of logistics could impair our ability to procure raw materials and deliver our products on time.

 

 
Our Factory
 

The company currently has 3 elbow pushing machines and various types of molds. Capable of producing 1/2 "-24" seamless and slotted elbows through push production, with 6 sets of tee forming machines capable of producing tees of various wall thicknesses from 1/2 "-24". 10 sets of various types of press machines to meet the production of different types of reducer and pipe caps.

 

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Certifications
 

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FAQ
 

Q: How are flange ratings affected by temperature?

A: Flange ratings are temperature-dependent. As the temperature increases, the pressure-handling capacity of the flange decreases.

Q: What are the most common flange ratings used in industrial applications?

A: In industrial applications, flange ratings such as Class 150, Class 300, and Class 600 are commonly used.

Q: What is flange pressure range?

A: ASME B16. 5 provides seven pressure classes for flanges. They are Classes 150, 300, 400, 600, 900, 1500, and 2500.

Q: How to calculate flange size?

A: Measure across the base of your nipple, where your nipple meets the areola. Do not measure your areola, just the width of your nipple. Add 4mm to your measurement. These extra millimeters allow for a little space between your nipple and the flange tunnel, as well as for a bit of nipple expansion while pumping.

Q: How does a flange fail?

A: Dirty or Damaged Flange Faces. Dirt, scale, scratches, protrusions, weld spatter on gasket seating surfaces, and warped seating surfaces provide leakage paths or can cause uneven gasket compression that can result in flange leakage.

Q: What is flange grade?

A: A flange rating is also referred to as a flange class or pressure class. Flange ratings are typically designated by a numerical value, such as Class 150, Class 300, and Class 600; the higher numbers indicate greater pressure and temperature resistance.

Q: How do you test for leaks in flanges?

A: This involves filling the piping system with water, which is then pressurized to a specified test pressure that is higher than the system's normal operating pressure. Observations are made for any water leakage around the flange.

Q: Are flange sizes universal?

A: Women's bodies and breasts are all different, so it makes sense that flanges come in different sizes too. But choosing the right flange size is less about your bra size and more about making sure it allows your nipple to move the way it should. Basically, larger nipples call for larger flanges.

Q: What is the correct flange position?

A: When displayed either horizontally or vertically against a wall, the union should be uppermost and to the flag's own right, that is, to the observer's left. When displayed in a window, the flag should be displayed in the same way, with the union or blue field to the left of the observer in the street.

Q: How do flanges seal?

A: Placing a flange gasket between the two pipes will seal them. The flanged gasket will fill the space of the flanged collars so that the joined pipes don't leak. Flanged gaskets are simply flared mechanical seals that fill the space in the mating surfaces where multiple sections of pipe come together.

As one of the leading flange manufacturers and suppliers in China, we warmly welcome you to buy high quality flange made in China here and get pricelist from our factory. For price consultation, contact us.

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