Lap Joint Flanges
China Lap Joint Flanges
We provide flange products of various standards, such as ASME/ANSI B16.5, EN standards, etc. We also provide customized Lap Joint flange products.
As a company with 25 years of flange production experience, we support all types of flanges, and we can give you the best product quality, the most reasonable price.
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Lap Joint Flange Specifications
| Standard | Type | Class | Size |
|---|---|---|---|
| ASME B16.5 | WN/LWN/SO/Blind/Lap Joint | 150#-2500# | 1/2″-24″ |
| ASME B16.47 Series A | WN/blind flange | 150# -900# | 22″-60″ |
| ASME B16.47 Series B | WN/blind flange | 75# 400# 600# | 26″-60″ |
| 900# | 26″-48″ | ||
| EN1092-1:2002 | Plate flange for welding/loose plate | PN2.5-PN100 | DN10-DN4000 |
| flange with weld-on plate collar or | |||
| for lapped pipe end/Blind/WN flange | |||
| JIS B2220 | Welding Flange, Lap joint flange, threaded flange | PN6-PN100 | DN10-DN1500 |
| BS4504 BS10 TableD/E | Plate Flange for welding/WN flange/Blank Flange | PN6-PN100 | DN10-DN1500 |
| Sealing Surface | RF, FF, MFM, TG, RJ | ||
| Flange Face Finish | 125-250 AARH (it is called smooth finish) | ||
| 125-250 AARH(it is called smooth finish) | |||
| Vanish, yellow paint, anti-rust oil, galvanizing, etc | |||
| Coating | Vanish, yellow paint, anti-rust oil, galvanizing etc | ||
Lap Joint Flange Materials & Grades
Lap Joint flanges are available in a variety of materials. These materials must meet the standards. The material should also meet the quality specified by ASTM or ASME standards. The thickness and inner diameter of the flange will depend on the size of the pipe for which this Lap Joint flange is manufactured.
Carbon alloys are common manufacturing materials for Lap Joint flanges as they are resistant to extreme temperatures. It is available in two materials, ASTM A 181 and ASTM A 105. The flanges are available in a variety of grades, such as ASME B16 47 ‘A’ series and ‘B’ series, to meet the needs of customers and industries.
Apart from this material, Lap Joint flanges are also available in stainless steel. Flanges are made of ASTM A182, F304, 316L, 347H, 310S, ASME B16 5, and with duplex steel facing. The following table is the grade of these common materials:
| Material | Grade |
|---|---|
| Carbon Steel | ASTM/ASME B/SB160 UNS N02201 (NICKEL 201), ASTM B/SB472 UNS N08020 (Alloy 20) |
| Alloy Steel | ASTM/ASME A/SA 182 F5, F9, F11, F22, F91 |
| Stainless Steel | ASTM/ASME A/SA 182 F304, 304L, 304H, 310H, 316, 316H, |
| 316L, 316LN, 316Ti, 317, 317L, 321, 321H, 347, 347H, 904L | |
| Duplex and Super Duplex | ASTM/ASME A/SA 182 F44, F45, F51, F53, F55, F60, F61, S31803, S32205, S32550, S31254, SMO254, S32750, S32760, S32950 |
| Nickel Alloy Steel | ASTM/ASME B/SB151 UNS N07060, 71500, C70600 (CuNi 90/10), C71500 (CuNi 70/30) |
| UNS N08825( INCOLOY 825), UNS N06600(INCONEL 600), UNS N06601(INCONEL 601), | |
| UNS N06625(INCONEL 625), UNS N10276(HASTELLOY C276) | |
| ASTM/ASME B/SB151 UNS N07060, 71500, C70600 (CuNi 90/10), C71500(CuNi 70/30) | |
| Copper Alloy | ASTM/ASME B/SB151 UNS N07060, 71500, C70600 (CuNi 90/10), C71500 (CuNi 70/30) |
| Titanium | ASTM/ASME B/SB381 Grade 2, Grade 5, Grade 7 |
Lap Joint Dimensions
Below we have listed some sizes of Lap Joint Flanges (Class 150) under ASME B16.5 (1/2″ to 24″)
- 1/2″ NPS Lap Joint flange has an inner diameter of 0.62″ and an outer diameter of 3.50″. The raised face thickness is 1.88″ and has four bolt holes.
- 3/4″ NPS flange has an inner diameter of 0.82″ and an outer diameter of 3.88″. The raised face thickness is 2.06″ with four bolt holes.
- 1″ NPS Lap Joint flange has an inner diameter of 1.05″ and an outer diameter of 4.25″. The raised face thickness is 2.19″ and the standard bolt holes are four numbers.
- 2″ NPS Lap Joint flange has an inner diameter of 2.07″ and an outer diameter of 6.00″ and a raised face thickness of 2.50″. · The 5″ NPS flange has an ID of 5.05″ and an OD of 10.00″. The raised face thickness is 3.50″.
- The 6″ NPS flange has an ID of 6.065″ and an OD of 11.00″. The raised face thickness is 3.50″.
- The 10″ NPS flange has an ID of 10.02″ and an OD of 16″. The raised face thickness is 4.00″.
- The 20″ NPS flange has an ID of 19.25″ and an OD of 27.50″. The raised face thickness is 5.69″.
- The 24″ NPS Lap Joint flange has an ID of 23.25″ and an OD of 32.00″.
Standardized Lap Joint Flanges
- Lap Joint Flanges are commonly standardized as ASME B16.5 and ASME B16.47, with sizes ranging from 1/2 inch to 60 inch.
- Sealing surface types include raised face (RF), flat face (FF), dimpled face (MFM), tongue and groove (TG), ring joint (RJ), and so on.
- Applicable pressure classes include Class 150, 300, 400, 600, 900, 1500, 2500.
| ASME B16.5 Lap Joint Flanges | |
| Class 150 | Class 900 |
| Class 300 | Class 1500 |
| Class 400 | Class 2500 |
| Class 600 | |
Customized Lap Joint Flanges Process
The following options are for you to customize. If you don’t have a design drawing, you can also consult our engineers and let us help you draw it.
size
Specified pipeline size, including flange ID and OD, thickness, bolt hole diameter, bolt hole distance, etc.
Material
Using specified material suitable for pipeline engineering according to your requirements.
Shape
can be customized with irregular flanges such as square flanges and conical flanges, etc.
Connection
Threaded connection, welding connection, Lap Joint connection, etc., which can be selected.
Special Treatment
Special treatments such as surface coatings and anti-corrosion can be made according to your needs.
The customization process for flanges is generally as follows:
requirements
Confirmation
Communicate in detail to determine the requirements for flange size, material, pressure, connection method, etc.
Design drawings
Our professional engineers will design flange drawings for you. The drawings will specify the size, shape, thickness, etc. of the flange in detail.
Choose materials
Select suitable flange materials according to the requirements of the engineering project.
Customer confirmation
Send detailed information, such as the designed drawings and materials, to the customer for confirmation.
Processing sample
To ensure accuracy, first produce a sample according to the drawings and selected materials and send it to the customer for trial confirmation.
Production of bulk goods
After confirming the accuracy of the samples, proceed with mass production.
More reading:
Image Gallery
Here are various Lap Joint flanges produced by YANHAO. You can click on the pictures to enlarge them. As a company with 25 years of flange production experience, YANHAO supports all types of flange production.
Lap Joint Flange Product Image Gallery
YANHAO Factory Image Gallery
About YANHAO
YANHAO is a flange manufacturer located in Hebei Province, China. It is one of the few professional Flange suppliers in China.
We have many years of experience in flange production and have multiple flange production lines. We have sufficient stock of raw materials, rich inventory, fast delivery, and can ship within three days. At the same time, the price is affordable. You are welcome to consult and purchase!
In addition, we can provide a variety of customized flanges and pipe fittings. Customers can give drawings or samples, and our company will produce them to fit your specific requirements.
Our company was founded in 2000 and has more than 300+ employees, including 85+ middle and senior engineering and technical personnel. Our company has a number of production lines and covers an area of 150,000 square meters and a building area of 30,000 square meters.
300+
Number Of Workers
85+
Mid&Senior Engineers
150,000
Square Meters of Area
25+
Years of Experience
Our Production Line
Our company has 8 pipe fitting production lines and 5 flange production lines. It has a full set of medium-frequency elbow hot-pushing machines, hot-die presses for reducers, cold-extrusion hydraulic presses for tees, forging hammers, vertical lathes, drilling machines, and other process-forming and mechanical processing equipment.
Among them, the Φ1020 mm large-diameter medium-frequency hydraulic pushing machine, Φ1420 mm large-diameter medium-frequency bending machine, and Φ2438 mm 4,000-ton large hot-die press have an annual production capacity of more than 80,000 tons.
8
Pipe Fitting Production Lines
5
Flange Production Lines
80,000 tons
Annual Production Capacity
Quality Testing & Certificates
Our company is also equipped with a full set of physical and chemical testing, including spectrometer direct reading, non-destructive testing, heat treatment, water pressure testing, and other product quality testing equipment, providing a reliable guarantee for the production of high-quality products.
Check Our Certificates
FAQs About Lap Joint Flange
What is Lap Joint Flanges
A lap joint flange is a flange that is loosely attached to the flange of a container or pipe. It is characterized by being movable on the pipe end. The flange is usually placed at the end of the pipe using a flange, a steel ring, etc., and the flange can be movable on the pipe end.
This design prevents the flange from generating additional torque on the container or pipe when deformed. It is also easy to manufacture and can be made of materials different from those of the container or pipe, thereby saving precious metals. The flange of a lap joint flange can be made by flanging, direct turning, or welding a ring.
Its advantages include not generating additional torque on the container or pipe, being easy to manufacture, and being able to be made of different materials. However, the disadvantage of a lap joint is that the flange is relatively thick and is suitable for occasions where the container or pipe is lined with brittle materials and the pressure is not high.
ASME B16. 5 Lap Joint Flanges are mostly used with stub end fittings. This is usually welded and is free to rotate around the stub end. This consists of various dimensions and it includes factors like nominal size, outside diameter, thickness, and many more.
Freedom to swivel around the pipe facilitates the lining up of opposing flange bolt holes. Lack of contact with the fluid in the pipe often permits the use of inexpensive carbon steel flanges with the corrosion-resistant pipe.
5 are. Welding Neck, Slip On, Socket Weld, Lap Joint, Threaded and Blind flange. Below you will find a short description and definition of each type, complete with a detailed image.
Lap joint flanges are extremely similar to slip-on flanges, with the primary difference being that the bore and face have a curved radius to accommodate a lap joint stub-end. Lap joint flanges and stub-end assemblies are commonly employed in circumstances where regular disassembly for inspection is necessary.
The flanged joint design means that pipes are secured by external screws, providing additional joint support for the transportation of substances at high pressure.
To assemble a lap joint ring flange and stub end, the stub end must slide into the bore of the flange ring and then be butt welded to the pipe. One side of the stub end forms the sealing face, whilst the opposite/back side of the stub end presses against the lap joint flange ring (when the flange is assembled).
More Types of Flanges
Weld Neck Flanges (WN)
WN flange, also known as a trapped hub flange or high-hub flange, is a high-stress-containing flange. Its circular fitting component, the rim, is fitted around the circumference.
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Slip-on Flanges (SO)
Slip-on flanges, as the name shows, can be easily slipped onto the end of a pipe or fitting and then welded in place. It usually has a flat face and a protruding face.
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Socket Weld Flanges (SW)
Socket Weld Flanges (SW) are similar to Slip-on Flanges (SO). The difference is that there is an extra piece in the middle.
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Blind Flanges (BF)
Blind flange is also called flange cover. It is a flat, circular plate used to cover the ends of pipes, valves, or joints.
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Lap joint flange (LJ)
Consisting of two components: a stub end and a lap joint ring flange. The respective stub end is slid into the flange’s bore, and the stub end is joined to the pipe through butt welding.
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Threaded Flanges (TF)
Threaded flanges are pipe flanges with internal threading to match external threads on a pipe. The installation does not involve welding
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