Lap Joint Flanges
China Lap Joint Flanges
We provide flange products of various standards, such as ASME/ANSI B16.5, EN, DIN, JIS, 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 | ||
| 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 depend on the size of the pipe for which this Lap joint flanges is manufactured.
Carbon steel flanges are commonly used manufacturing materials for Lap joint flanges. You can choose the appropriate material according to the medium of the pipeline. You can choose ASTM A105 for normal temperature, ASTM A350 for low temperature, and ASTM A694 for high temperature.
Flanges are available in a variety of grades, such as ASME B16 5, ASME B16 47 “A” series and “B” series to meet the needs of customers and industries.
In addition to this material, Lap joint flanges are also available in stainless steel and alloy steel, which have material properties such as corrosion resistance, high temperature resistance, and wear resistance. At the same time, we also have duplex steel materials to meet the technical requirements of various pipelines of customers. The following table shows the grades of these common materials:
| Material | Grade |
|---|---|
| Carbon Steel | ASTM A105, 20#, Q235, 16Mn, ASTM A350 LF1, LF2 CL1/CL2, LF3 CL1/CL2, ASTM A694 F42, F46, F48, F50, F52, F56, F60, F65, F70 |
| Alloy Steel | ASTM A182 F1, F5a, F9, F11, F12, F22, F91, A182F12, A182F11, 16MnR, Cr5Mo, 12Cr1MoV, 15CrMo, 12Cr2Mo1, A335P22, St45.8/Ⅲ; |
| Stainless Steel | ASTM A182 F304, 304L, F316, 316L, 1Cr18Ni9Ti, 0Cr18Ni9Ti, 321, 18-8; |
| 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 flange has an inner diameter of 0.90″ and an outer diameter of 3.50″. The raised face thickness is 0.62″ and has 4 bolt holes.
- 3/4″ NPS flange has an inner diameter of 1.11″ and an outer diameter of 3.88″. The raised face thickness is 0.62″ with 4 bolt holes.
- 1″ NPS flange has an inner diameter of 1.38″ and an outer diameter of 4.25″. The raised face thickness is 0.69″ and the standard bolt holes are 4 numbers.
- 2″ NPS flange has an inner diameter of 2.46″ and an outer diameter of 6.00″. The raised face thickness is 1.00″ and the flange has 4 bolt holes.
- 5″ NPS flange has an inner diameter of 5.69″ and an outer diameter of 10.00″. The raised face thickness is 1.44″, and it has 8 bolt holes.
- 6″ NPS flange has an inner diameter of 6.75″ and an outer diameter of 11.00″. The raised face thickness is 1.56″, and it has 8 bolt holes.
- 10″ NPS flange has an inner diameter of 10.92″ and an outer diameter of 16.00″. The raised face thickness is 1.94″, and it has 12 bolt holes.
- 20″ NPS flange has an inner diameter of 20.25″ and an outer diameter of 27.50″. The raised face thickness is 4.06″, and it has 20 bolt holes.
- 24″ NPS flange has an inner diameter of 24.25″ and an outer diameter of 32.00″. The raised face thickness is 4.38″, and it has 20 bolt holes.
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
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).
About YANHAO
YANHAO is a China 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
Yes, we are a flange pipe fittings manufacturer located in Cangzhou, Hebei, China. Founded in 2000, we cover an area of 150,000 square meters, with a building area of 30,000 square meters. We currently have more than 300 employees and are a relatively large and powerful Chinese flange manufacturer.
The company has 8 pipe fittings production lines and 5 flange production lines. It has a full set of medium-frequency elbow hot push machines, reducer hot mold presses, tee cold extrusion hydraulic presses, forging hammers, vertical lathes, drilling machines and other processing and machining equipment. Among them, the φ1020 mm large-diameter medium-frequency hydraulic push machine, φ1420 mm large-diameter medium-frequency bending machine, and φ2438 mm 4,000-ton large-scale hot mold press have an annual production capacity of more than 80,000 tons.
For standard models, our factory has a large inventory, and the delivery time is usually only a few days. For non-standard parts, we also have a large reserve of raw materials and multiple production lines, which will save one-third of the time compared to other manufacturers and ship them to you as soon as possible.
We have our own testing system. Each batch of goods will have a corresponding product certificate and quality inspection report. At the same time, we have ISO9001 product quality certification, classification society certificate, ASNE quality certificate and other international authoritative quality certification certificates. We will never ship out unqualified products. In addition, we support customers to entrust third-party inspection companies for inspection and acceptance.
Of course, you can provide us with drawings or samples for customization, or you can ask us to design and customize your exclusive flange pipe fittings for you. Learn More>>
Our products are used in oil, gas, chemical industry, machinery, shipbuilding, aerospace, electricity, pharmaceuticals, construction engineering, water conservancy engineering, and marine engineering. Don’t worry about some special fields with high requirements. We have strong production capacity and rich production experience and can provide you with professional solutions. You can send us your working conditions and we can give you a solution for free.
Our company can provide you with samples for free, you can contact sales to request samples.
Of course, you are very welcome to visit our factory. We will also arrange meals and accommodation for you. If you have enough time, we can also take you to visit China’s famous mountains and historical sites, so that you can better understand China and our culture. It will be worthwhile and we look forward to seeing you.
Middle Eastern customers visit Yanhao pipe fittings factory
We are the source manufacturer. If you have the strength, you will get more favorable prices, faster delivery and more guarantees if you purchase directly from us. We will have professional sales staff to track customers’ orders throughout the process, update the order status in real time, and let customers know their order progress and product quality in real time.
We support payments in over 40 currencies worldwide.
We have a long-term logistics transportation company that supports sea, land and air transportation to ensure that customers receive the goods on time. At the same time, if customers have a cooperative logistics company, we will still fully cooperate with your logistics company to ensure that customers can receive the goods as soon as possible.
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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