Flange Knowledge
Flange Knowledge
Pipe Fittings Knowledge

Flange Knowledge

Types of steel pipe flanges

Types of Carbon Steel Pipe Flanges The most used flange types 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, completed with an detailed image. MOST COMMON FLANGE TYPES Welding Neck Flange Welding Neck Flanges are easy to recognize at the long tapered hub, that goes gradually over to the wall thickness from a pipe or fitting.The long tapered hub provides an important reinforcement for use in several applications involving high pressure, sub-zero and / or elevated temperatures. The smooth transition from flange thickness to pipe or fitting wall thickness effected by the taper is extremely beneficial, under conditions of repeated bending, caused by line expansion or other variable forces.These flanges are bored to match the inside diameter of the mating pipe or fitting so there will be no restriction of product flow. This prevents turbulence at the joint and reduces erosion. They also provide excellent stress distribution through the tapered hub and are easily radiographed for flaw detection.This flange type will be welded to a pipe or fitting with a single full penetration, V weld (Buttweld). Slip on Flange The calculated strength from a Slip On flange under internal pressure is of the order of two-thirds that of Welding Neck flanges, and their life under fatigue is about one-third that of the latter.The connection with the pipe is done with 2 fillet welds, as well at the outside as also at the inside of the flange.The X measure on the image, are approximately:Wall thickness of pipe + 3 mm.This space is necessary, to do not damage the flange face, during the welding process.A disadvantage of the flange is, that principle always firstly a pipe must be welded and then just a fitting. A combination of flange and elbow or flange and tee is not possible, because named fittings have not a straight end, that complete slid in the Slip On flange. Socket Welding Flange Socket Weld flanges were initially developed for use on small-size high pressure piping. Their static strength is equal to Slip On flanges, but their fatigue strength 50% greater than double-welded Slip On flanges.The connection with the pipe is done with 1 fillet weld, at the outside of the flange. But before welding, a space must be created between flange or fitting and pipe.ASME B31.1 1998 127.3 Preparation for Welding (E) Socket Weld Assembly says:In assembly of the joint before welding, the pipe or tube shall be inserted into the socket to the maximum depth and then withdrawn approximately 1/16" (1.6 mm) away from contact between the end of the pipe and the shoulder of the socket.The purpose for the bottoming clearance in a Socket Weld is usually to reduce the residual stress at the root of the weld that could occur during solidification of the weld metal. The image shows you the X measure for the expansion gap.The disadvantage of this flange is right the gap, that must be made. By corrosive products, and mainly in stainless steel pipe systems, the crack between pipe and flange can give corrosion problems. In some processes this flange is also not allowed. I am not an expert in this matter, but on the internet, you will find a lot of information about forms of corrosion.Also for this flange counts, that principle always firstly a pipe must be welded and then just a fitting.

Steel Pipe Dimensons - Schedule 40

Steel Pipe Dimensons - Schedule 40 ANSI schedule 40 steel pipes' internal and external diameters, areas, weights, volumes and number of threads. Based on ASTM A53 - Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless. ASTM A53 pipe - also referred to as ASME SA53 pipe - is intended for mechanical and pressure applications. Can be used in steam, water, gas and air lines. Suitable for welding and forming like coiling, bending and flanging.· 1 in2 = 645.2 mm2 = 6.452 cm2 = 6.452x10-4 m2· 1 ft (foot) = 0.3048 m Related RFQS Steel Pipe Dimensions - Schedule 80About JS FITTINGS MS/CS pipe fittingsWhat is the most effective inspection method for seam pipe elbow?How to get the samples of pipe fittings?

ASME/ANSI B16.5 flange and bolt demisions

ASME/ANSI B16.5 Flange and Bolt Demisions Flange dimensions are determined by the pipe size and the pressure class required for the application. Flanges are standardized according publications from organizations like ASME, MSS, API and others. ASME/ANSI B16.5 provides· weld neck flanegs· slip-on flanges· socket weld flanges· threaded flanges· lap joint flanges· blind flangesFlange dimensions for pipes ranging 1/2" to 24" - in classes ranging 150 to 2500. · Steel Pipe Dimensons - Schedule 40· Steel Pipe Dimensions - Schedule 80

The key step in the production of butt flanges - annealing

The key step in the production of butt flanges - annealing 5 STEPS 1. Whether the annealing temperature reaches the specified temperature. The welding flange treatment is generally a solution heat treatment, which is commonly called "annealing", and the temperature range is 1040~1120 °C. You can also observe through the observation hole of the annealing furnace. The flanged pipe fittings in the annealing zone should be in an incandescent state, but there is no softening and sagging.Second, the welding flange is used to process the water vapor in the casting furnace. On the one hand, check whether the material of the furnace body is dry. When the furnace is installed for the first time, the material of the furnace body must be dried. Second, if there are too many water stains on the flanged pipe fittings entering the furnace, if there is a hole on the flange pipe fittings, do not leak water. Go in, or else destroy the atmosphere of the stove.Third, the furnace body sealability. The soldering flange bright annealing furnace should be closed and isolated from the outside air; if hydrogen is used as the shielding gas, only one exhaust port is open (used to ignite the discharged hydrogen). The method of inspection can be applied to the joint gap of the annealing furnace with soapy water to see if it runs. The place where the gas is easy to run is the place where the annealing furnace enters the pipe and the place where the pipe is discharged. The sealing ring in this place is particularly easy to wear, and often Check frequently.Fourth, protect the gas pressure. In order to prevent micro-leakage on the welding flange, the protective gas in the furnace should maintain a certain positive pressure. If it is hydrogen shielding gas, it generally requires more than 20kBar.Fifth, the annealing atmosphere. For the welding flange, pure hydrogen is generally used as the annealing atmosphere, and the purity of the atmosphere is preferably 99.99% or more. If another part of the atmosphere is an inert gas, the purity can be lower, but it cannot contain too much oxygen or water vapor.

General application of pipe flanges

Application of JS flanges Carbon steel Flanges Carbon Steel Flanges are required for making tight, secure, & leak-free connections to an existing piping system according to need. JS Flanges have pre-drilled holes for hassle-free bolting using appropriate fasteners. JS flanges are also suitable for making fire pipe fitting in a reliable manner and during building & construction work. This category offered by JS FITTINGS includes Carbon Steel Welding Neck Flanges, Carbon Steel Slip-on Flanges, Carbon Steel Threaded Flanges, Carbon Steel Plate Flanges, Blind Flanges, Socket Welding Flanges, Ring Type Joint Flanges, Carbon Steel Reducing Flanges, and Carbon Steel Long Weld Neck Flange. They have a robust structural configuration with Anti-rust oil surface or galvanized surface thus assure good corrosion resistance. These steel flanges are highly durable in nature and do not require any special maintenance.

what's the standard weight of ASME B 16.47 SER.B (API 605) HG 20625?

Standard weight of ASME B 16.47 SER.B welding neck flanges and blind flanges SIZEWeight of Class 150Weight of Class 300Weight of Class 600 Weight of Class 900 DNNPSWN FLANGEBLIND FLANGEWN FLANGEBLIND FLANGEWN FLANGE BLIND FLANGE WN FLANGE BLIND FLANGE 65026"54.5169.4181.6411.8249.7 512.1 476.7 991.6 70028"63.6206.2204.3464.5295.1 647.9 620.1 1254.0 75030"68.1246.6249.7567.1367.8818.2826.31513.780032"77.2294.2311706.5431.3980.2937.61754.885034"95.4355.5340.5780.5547.11200.91112.32077.690036"109.0404.1381.4872.2608.41368.01144.12253.395038"131.7494.5415.51024.7////100040"140.8566.2449.51157.3////105042"156.7632.5515.31305.8////110044"168716.9560.71500.2////115046"197.5828.1667.41709.8////120048"218928.5715.11899.1////125050"236.11037.0776.42101.6////130052"249.71168.6835.42313.6////135054"281.51293.08992577.9////140056"295.11427.41178.23015.5////145058"354.21616.31257.63335.6////150060"386.91776.613033623.0//// Large-caliber flange ASME B 16.47 is one kind of the flanges. It is widely used and popularized in mechanical industry, chemical industry, wind power industry and sewage treatment industry. Forged flanges in large size have been praised and favored by users. Large-caliber flanges are widely used. The production process is divided into rolling and forging, and the extra large flanges can only be rolled. Material is carbon steel, stainless steel and alloy steel, etc.