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Who we are

Welcome to Wenzhou F&D flange limited company

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Wenzhou F&D flange limited company was established in 2004 and is a professional stainless steel flange manufacturer. It is located in the national development zone - Wenzhou Binhai Industrial Park, near the East China Sea, adjacent to Longwan International Airport. Besides, there is Yongqiang road connected upward, and Yongtaiwen Expressway connected downward, which gives us great convenience of transportation. The historical background of Wenzhou, the spring breeze of reform, the opening up, and the unique hydrological climate have made us occupy the “Good timing, geographical convenience and harmonious human relation”.

 

Rome was not built in a day. More than ten years of business development, more than ten years of experience, have developed the deep company background of F&D Adhering to the "quality as the root, reputation-based" business philosophy, the F&D has established a good corporate image of commitment...

 

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  • 2004

  • 600

  • 200

company be established

course of company(year)

Number of employees

Ten years of experience

F&D flange Product

Welding Neck Flange or Welded Flange or Butt Weld Flange(WN)

Welding Neck Flange or Welded Flange or Butt Weld Flange(WN)

A welding neck flange (“WN”)features a long tapered hub that can be welded with a pipe.
This flange type is used, normally, in high-pressure and high/low temperatures applications that require an unrestricted flow of the fluid conveyed by the piping system (the bore of the flange matches with the bore of the pipe).
The absence of pressure drops prevents negative effects as turbulence and erosion/corrosion of the metals in the proximity of the flanged joints.
The tapered hub allows a smooth distribution of the mechanical stress between the pipe and the weld neck flange and facilitates the execution of radiographic inspections to detect possible leakages and welding defects.
The dimension of the flange (NPS and the pipe schedule) shall match the dimension of the connecting pipe.
A welding neck flange is connected to a pipe by a single full penetration V-shaped butt weld.
Threaded Flange or Screwed Flange

Threaded Flange or Screwed Flange

Threaded flanges are joined to pipes by screwing the pipe (which has a male thread, generally NPT per ASME B1.20.1) onto the flange, without seam welds (in certain cases, though, small welds are applied to increase the strength of the connection).
Threaded flanges are available in sizes up to 4 inches and multiple pressure ratings, however, they are used, mostly, small size piping in low pressure and low-temperature applications, like water and air utility services.
Threaded flanges are also a mandatory requirement in explosive areas, such as gas stations and plants, as the execution of welded connections in such environments would be dangerous.
Slip-on Flange or Flat Welding Flange(SO)

Slip-on Flange or Flat Welding Flange(SO)

A slip-on flange is connected to the pipe or the fittings by two fillet welds, one executed inside and one outside the cavity of the flange.
The bore size of a slip-on flange is larger than the outside diameter of the connecting pipe, as the pipe has to slide inside the flange to be connected by the execution of a fillet weld.
Slip-on flanges are also defined “Hubbed Flanges” and they are easy to recognize due to their slim and compact shape.
Slip-on Flange or Flat Welding Flange(SO)

Slip-on Flange or Flat Welding Flange(SO)

A slip-on flange is connected to the pipe or the fittings by two fillet welds, one executed inside and one outside the cavity of the flange.
The bore size of a slip-on flange is larger than the outside diameter of the connecting pipe, as the pipe has to slide inside the flange to be connected by the execution of a fillet weld.
Slip-on flanges are also defined “Hubbed Flanges” and they are easy to recognize due to their slim and compact shape.
Long Weld Neck Flange

Long Weld Neck Flange

Long weld neck flanges (“LWN”) are similar to weld neck flanges, with the exception that the neck (tapered hub) is extended and acts like a boring extension.
Long weld neck flanges are generally used on vessels, columns or barrels. These flange types are available also in the heavy barrel (HB) and equal barrel (E) types.
Lap Joint Flange or Loose Flange

Lap Joint Flange or Loose Flange

Lap joint flanges feature a flat face and are always used in conjunction with a stub end.
Lap joint flanges resemble, in shape, slip-on flanges except for the radius at the crossing of the flange face and the bore to accommodate the flanged portion of the stub end.
A lap joint flange slips over the pipe and seats on the back of the stub end and the two are kept together by the pressure of the bolts.
The use of lap joint flanges in combination with stub ends is a cost-effective solution for stainless steel or nickel alloy pipelines, as the material of the lap joint flange can be of a lower grade (generally carbon steel) than the material of the stub end (which has to match the pipe grade, as in contact with the conveyed fluid).
This arrangement, therefore, has these two advantages:
reduces the overall cost of the pipeline’s flanged joints, as the use of higher grade materials is minimized; bolting operations are simplified, as the lap joint flange can be rotated around the pipe to help with bolts alignment.
Blind Flange(BL)

Blind Flange(BL)

Contrary to all the flange types seen above, blind flanges do not have a center hole, and are used to blind or seal a pipeline, a valve/pressure vessel and block the flow of the fluid.
Blind flanges have to withstand remarkable mechanical stress due to the system pressure and the required bolting forces.
Blind flanges allow easy access to the pipeline, as they can be easily unbolted to let the operator execute activities inside the terminal end of the pipe (this is also the reason why the blind flange type is used as manhole for pressure vessels, at times).
It is maybe interesting to observe that, while this flanges type is easier to manufacture, they are sold at a premium average cost per kilogram compared to the other flange types.
Lap Joint Flange or Loose Flange

Lap Joint Flange or Loose Flange

Lap joint flanges feature a flat face and are always used in conjunction with a stub end.
Lap joint flanges resemble, in shape, slip-on flanges except for the radius at the crossing of the flange face and the bore to accommodate the flanged portion of the stub end.
A lap joint flange slips over the pipe and seats on the back of the stub end and the two are kept together by the pressure of the bolts.
The use of lap joint flanges in combination with stub ends is a cost-effective solution for stainless steel or nickel alloy pipelines, as the material of the lap joint flange can be of a lower grade (generally carbon steel) than the material of the stub end (which has to match the pipe grade, as in contact with the conveyed fluid).
This arrangement, therefore, has these two advantages:
reduces the overall cost of the pipeline’s flanged joints, as the use of higher grade materials is minimized; bolting operations are simplified, as the lap joint flange can be rotated around the pipe to help with bolts alignment.

Quality Field

Adhering to the "quality as the root, reputation-based" business philosophy

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News Center

Adhering to the "quality as the root, reputation-based" business philosophy

Congratulations!We got the certificate of CE and ISO9001
2020-07-08

Congratulations!We got the certificate of CE and ISO9001

Congratulations!We got the certificate of CE and ISO9001.Our mission is and has been to provide the highest quality material with superior service at a competitive price. 
Read More >
Polishing Method of Dual Phase Steel Flange
2019-09-03

Polishing Method of Dual Phase Steel Flange

Do you know the common polishing methods of dual-phase steel flange? Today Xiaobian will take you to know the common polishing methods of this kind of flange, follow Xiaobian down to see.
Read More >
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F&D flange quality as the root

If you want to make the connection with us, either have any suggestions or proposes to our company, Please call us. Your problem will be solved more effectively.

 

Contact  F&D Flange

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Contact person:Sally

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86-15088565935

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86-15088565935

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chenchaoqunsunsheng

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No.27 Gangqiang Road,Konggang Economic Zone,Yongxing Street,Longwan District,Wenzhou,China

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