The lwn flange is a special flange used for nozzles on pressure vessel. Weld neck flanges are drilled machined with the wall thickness of the flange having the same dimensions of the matching pipe. When do we use slipon flange, a weld neck flange or. The bore of the weld neck flange matches the pipe bore. Outside diameter 12 12 thickness q 1 716 raised face 116. Weld neck flanges a b, stainless steel weld neck flanges a. Long weld neck flanges feature a long tapered hub that goes gradually over to the wall thickness from a pipe. The extreme pressure that is developed in piping applications throughout the industry calls for highpressure resistance. Coastal flange stocks import and domestic ansi b16.
Below you will find a short description and definition of each type, completed with an detailed image. Buffalo flange is dedicated to flange quality and customer. The typical drawing is for weld neck flanges in accordance with asme b16. Email this page download pdf download pdf printable page. Our range weld neck flanges, welding neck flanges are normally used for highpressure, cold or hot. With the largest distributor inventory in the country, we are sure to have what you need, when you need it. The long welding neck flanges proposed in our catalog are made from a selection of different carbon steels, low alloy, low temperature, high yield, alloy and stainless steel.
Forged seamless long welding necks asme class 150 2500 dimensional data 56 robertjames sales, inc. The typical drawing of weld neck flanges mathematical modeling for weight calculation of weld neck flanges. Other than neck, all the dimensions are same as the regular flanges. Weld neck flange is typically provided with a raised facerf, flat faceff, or.
The slip on flange is not approved above class 1500. The lwn or long weld ing neck flange is available through 24 sizes meeting the asme b16. A long weld neck flange has a barrel that provides proper clearance between the nut and neck. Im assuming you are referring to welding neck or weldneck flanges when you say weld on flanges see below welding neck flange welding neck flanges are easy to recognize at the long tapered hub, that goes gradually over to the wall thickne. Where standard weld neck flanges are used extensively for pipes, long weld neck flanges often abbreviated to lwn are used in high pressure and high or fluctuating temperature situations primarily in the oil and gas industry. The long neck guides the pipe into the flange itself and provides reinforcement that a standard weld neck.
Long weld neck flanges are available in following specifications. Equal lwn barrels and heavy barrels are also popular. You can also make your own knife by naming a group theknife. Many industrial businesses use long neck flanges on columns and barrels as nozzles. It is designed to transfer stresses to the pipe, thereby reducing high stress concentrations at the base of the flange. Dimensions in inches of weld neck flanges and stud bolts. Point of weld a hub diameter x bore b number of holes diameter of holes bolt circle c approximate weight lbs 12 3. Long neck flanges are used by many industries because they are strong and resist.
Limited can also meet the specifications of asme b16. Point of weld a hub diameter x bore b number of holes diameter of. Weld neck flanges from buffalo flange, houston have a tapered neck for reinforcing strength. Long weld neck flange dimensions class 150 to class 2500.
Long welding neck flanges can be made according to customers drawings. Browse raised face weld neck flanges din pn6 steel in the world wide metric, inc. The 2 components are manufactured in one piece, and not welded. Carbon steel flanges are available in sizes from 14 to 64 and are manufactured and quality controlled to meet asme, astm, bs and dinwerkstoffe standards.
Weld neck flanges or welding neck flanges can be differentiated from all other types of flange by their long tapered hub. Long weld neck flange manufacturing forged components. Home datasheets flange datasheets standard connection flange datasheets flange long weld neck, ansi class 150, asme b16. Some of the flange materials such as stainless steel are highly resistant to heat. The typical length stocked is 9 and 12 and can be machined to shorter lengths with a quick turnaround. A weld neck flange is drilled with the wall thickness of the flange having equal dimensions to the matching pipe. A long neck flange and a welding neck flange have similar features. Thickness of standard wall is the same as schedule 40 in size nps 10 dn 250 and smaller.
Weldneck flanges or weldingneck flanges can be differentiated from all other types of flange by their long tapered hub. This datasheet is for weld neck flanges that have a raised face connection. Weld neck flanges, welding neck flange, slip on flange, blind flange. Flate face ff, raised face rf, ring type joint rtj ss flange standards types and pressure class. As the name suggests, long neck flange has long neck than regular weld neck flange. Long weld neck flanges are similar to a standard weld neck flange but the a. The strength of a slip on flange under internal pressure is about 40% less than that of a weldneck flange, and the fatigue rate is about 66% less. It is used as a nozzle in the pressure vessel and heat exchanger.
The technical drawing,dimensional data sheet and weight list of long weld neck flange lwn 300lb according to asme b16. Raised face weld neck flanges din pn6 steel on world wide. The strength of a slip on flange under internal pressure is about 40% less than that of a weld neck flange, and the fatigue rate is about 66% less. The lighter the pipe is the larger the bore is in the weld neck flange. The piping material specifications should not include every flange type in every line class. Browse raised face weld neck flanges din in the world wide metric, inc. Forged carbon steel, dimensions conform to ansi b16. Dimensions, sizes and specification of long welding neck flanges1. However, a long neck flange has a slightly longer neck. Dimensions, sizes and specification of long welding neck. And conversely the heavier the pipe is the smaller the bore is in the weld neck flange. Weld neck flanges houstons flange supplier, buffalo flange. Welding neck flanges weld neck raised face flanges latest.
The weld neck flange is designed to joint a piping system by butt welding. Raised face weld neck flanges din on world wide metric, inc. Weld neck or welding neck flange dimensions, tolerances and required stud bolts, asme b16. Uses of long weld neck flanges forged components, inc.
This type of connection in a pipe flange allows for ease of disassembly and separation for repair and regular maintenance. In pressure classes 150 and 300, the height of raised face is approximately 1. Weld neck flange,welcome to visit cangzhou hengjia pipeline co. Long weld necks 150, 300, 400, 600, 900, 1500, 2500 56 studding. Long weld neck flange dimensions are covered in asme b16. Weld neck flange advantages suitable for high pressure and high heat applications.
The knife is a group you can rotate, change the size of, and even add or remove objects within example add a function curve for an advanced cut. Weld neck flanges a b, stainless steel weld neck flanges. During dimensional inspection of flange, you should check for. Weld neck flanges and stud bolts dimensions asme b16. Technical specification of long weld neck flangelwn flange. Benefits of using weld neck flanges weld neck flanges.
The hub, or neck, transfer the stresses to the pipe to reduce high stress concentrations. The weight calculation of weld neck flanges is based on the geometrical or mathematical modeling of the flange. The length of the flange can be increased if an offset attachment is needed on the heads or vessel shells. Bolt circle diameters are 18 inch larger than bolt diameter. Long weld neck flanges we are manufacturer, supplier and exporter of asme 16. The lighter the pipe is, the larger the bore, conversely, the heavier the pipe, the small the bore. Long welding neck flanges catalogue hydraulic and offshore. Long weld neck flanges, stainless steel long weld neck. North shore steel, your exclusive source for long weld neck flanges from metalfar, italy.
Our carbon steel flanges are available in various formats such as slip on, blind, weldneck, socketweld, threaded, lap joint, orifice, spectacle blinds and long welded neck. For the height measures h and b of all described dimensions of flanges on this website, with exception of the lap joint flange, it is important to understand and remember the following. Flanges specification, standard and identification. Long weld neck flange lwn flange, is used for high pressure situations, integral hub weld neck flanges are used and for very high pressure. Weld neck flanges a b we are manufacturer, supplier and exporter of high quality weld neck flanges series ab. The long neck guides the pipe into the flange itself and provides reinforcement that a standard weld neck flange cannot. Weld neck flange is typically provided with a raised facerf, flat faceff, or ring type joint facertj. Flat face flanges may be provided at full thickness, c, or with raised face removed the latter is nonstandard. Dimensions in inches of weld neck flanges and stud bolts asme. Limited manufacturing sa105 and some inventory of sa350lf2, sa182f11, and sa182f22.
Sizes nps 12 through 312 are same as class 600 flanges. The welding neck flanges is normally referred to as the high hub flange. Technical specification of long weld neck flangelwn. Weights are based on manufacturers data and are approximate. Most commonly used flanges are weld neck flange, slip on flange, blind flange, socket weld flange, threaded flange and lap joint flange rtj flange. The weldoflange and nipoflange is a combination of a welding neck flange and a supposedly weldolet or nipolet. Weld neck flanges are perfect for extremely high and low temperatures. Weld neck flanges series ab are highly durable, corrosion resistant and reliable.
Long weld neck standard connection flanges texas flange. Weld neck flanges houstons flange supplier, buffalo. For other line classes you would normally use only weld neck flanges for all flange situations for 3 nps and larger. Long weld neck flanges are often used as a nozzle for a barrel or column. These flanges can also be manufactured with contoured bottoms.
Welding neck flanges weld neck raised face flanges. Stainless steel pipe fittings and valves are the focus of pipingnow com our large inventory allows for quick shipping. Another feature of the weld neck flange is that the inside diameter of the flange matches that of your pipe. Long weld neck flanges, also called lwn flange, are similar to standard weld neck flanges but the neck is considerably longer. Kerkau can also quote lengths beyond 12 upon request. We are manufacturer, supplier and exporter of high quality weld neck flanges series ab. Click any image above to enlarge it and lock it in place, then scroll to the bottom table for dimensions. The weld neck flange s tapered neck makes it ideal for use in highpressure situations and is, in fact, the most commonly used flange for highpressure applications. Weld neck flanges, weld neck flange manufacturer in china. Most common specification for carbon steel and stainless steel flange is.