What Are the Requirements for Flange Fittings During Installation?

What are the requirements for flange fittings from Flange Fitting Manufacturer during installation?

When connecting pipes with flanges from Flange Fitting Supplier, the constructor should perform the following operations on the flange connections. For flange connection, it should be operated in the transport medium, pressure and operating temperature.

1. Where the pipe section and the pipe section are connected by flange or the pipe is connected with the flange valve, the standard flange must be selected according to the design requirements and working pressure. The flange sealing surface and gasket should be inspected before installation, and there should be no defects such as scratches that affect the sealing performance.

2. For flanged pipes, the flange face should be perpendicular and concentric with the pipe centerline. The flanges should be parallel, and the deviation should not be greater than 1.5‰ of the outer diameter and not more than 2mm.

3. The type, thickness and specifications of the flange gasket (liner) should meet the design requirements. The flat flange should be concentric with the pipe diameter, should not be deflected, and should not protrude into the pipe. The outer edge should be evenly close to all bolt holes.

Effective Measures to Prevent Corrosion of Stainless Steel Pipe Fittings

Effective measures to prevent corrosion of stainless steel pipe fittings such as the Galvanized Socket Elbow:

1. Start with the material of the pipeline and strictly control the quality of raw materials.

Strict entry inspection of stainless steel pipe such as the Carbon Steel Reducer Elbow and stainless steel pipe fittings. To ensure that the materials meet the requirements.

When selecting materials, increase the corrosion allowance of pipe and stainless steel tee fittings to meet the service life requirements of the piping system.

2, surface coating protection

At present, in view of the corrosion of stainless steel elbow pipes in the environment, in addition to the selection of materials with strong corrosion resistance, it is also possible to improve the corrosion resistance by coating the surface of stainless steel pipes.

3. Electrochemical protection

Electrochemical protection methods mainly include protection of the protector, cathodic protection and anode protection.

What are the maintenance methods for elbows Pipe Fitting?

Elbow such as the Seamless Elbow maintenance method:

(1) The bolts of the elbow valve packing gland should be tightened evenly and should not be pressed into a smashing state to prevent the trap from hindering the valve stem movement or causing leakage.

(2) Apply the handwheel to the elbow such as the Welded Elbow. Do not use levers or other tools to avoid damage to the valve. The handwheel is twisted clockwise to block, and vice versa.

(3) The elbows for long-term storage of elbows shall be inspected on schedule. The general processing details of the exposed joints shall be cleaned and the roots shall be cleaned. The elbow manufacturers shall be stored neatly in the indoor air-dried premises. It is strictly prohibited to be stacked or stored in the open air.

(4) When the ball valve, globe valve and gate valve of the elbow are used, they are only fully open or fully closed, and are not promised to be used for adjustment, so as to avoid erosion of the sealing surface and accelerate wear. The gate valve and the upper thread stop valve have an inverted sealing device, and the hand wheel is screwed to the uppermost position to prevent the medium from leaking from the packing.

What Are The Types of Bend?

Classification of bend such as the Carbon Steel Bend

(1)the material is divided into carbon steel, cast steel, alloy steel, stainless steel, copper, aluminum alloy such as the Alloy Steel Bend, plastic.

(2)The production method can be divided into pushing, pressing, forging, casting, etc.

(3)According to the manufacturing standards, it can be divided into national, electric, ship, chemical, water, American, German, Japanese and Russian standards.

(4)According to its radius of curvature, it can be divided into long radius elbow and short radius elbow. A long radius elbow has a radius of curvature equal to 1.5 times the outside diameter of the pipe, R=1. 5 d. A short radius elbow has a radius of curvature equal to the outside diameter of the pipe, R= 1.0d. (D is the elbow diameter, R is the radius of curvature).

(5)According to the pressure grade, there are about 17 kinds of pipes, which are the same as the American pipe standards: Sch5s, Sch10s, Sch10, Sch20, Sch30, Sch40s, STD, Sch40, Sch60, Sch80s and XS; Sch80, SCH100, Sch120, Sch140, Sch160, XXS; The two most commonly used are STD and XS.

(6)according to different shapes and USES can be divided into: groove type elbow, bayonet type elbow, double bearing elbow, flange elbow, reducing elbow, base elbow, internal and external tooth elbow, stamping elbow, push elbow, socket elbow, butt welding elbow, wire elbow, etc.

We supply all kinds of bend such as the Mitre Bend with 3LPE. If you have demand, welcome to contact us.

Note on The Use of Flat Welded Flange Pipe Fitting

Note on the use of Welded Flange Tee products:

(1) In order to prevent the corrosion of the eye due to the heating of the flange cover, the welding current should not be too large, less than 20% than the carbon steel electrode, the arc should not be too long, the layer is fast cold, and the narrow weld bead is suitable. 

(2) The electrode should be kept dry when it is used. The titanium calcium type should be kept at 150 °C for 1 hour. The low a hydrogen type should be kept at 200-250 °C for 1 hour to prevent the electrode coating from sticking to oil and other dirt to avoid welding. The seam increases the carbon content and affects the quality of the weldment.

(3) When welding Stainless Steel Flange, it is repeatedly heated to precipitate carbides, which reduces corrosion resistance and mechanical properties of the product.

(4) The chrome flat welded flange pipe fittings have a large hardened American standard flange and are prone to cracks. If welding of the same type of chrome stainless steel electrode (G202, G207) is used, preheating at 300 °C or higher and slow cooling at around 700 °C after welding are performed. If the weldment cannot be post-weld heat treated, the flat welded flange pipe welding rod (A107, A207) should be used.

(5) Flat welding flange, in order to improve corrosion resistance and weldability, appropriately increase the appropriate amount of stability elements Ti, Nb, Mo, etc., and the weldability is better than that of the chrome flat welded flange.

We supply all kinds of pipe fitting such as the Integral Flange. If you have demand, welcome to contact us.

Stainless Steel Flange Pipe Fitting Installation and Maintenance Method

First of all, when installing the Stainless Steel Flange Pipe Fitting, you can pay attention to:

(1) The aluminum flange shall have a satisfactory strength and shall not be deformed when tightened. The tightening force should be uniform and the amount of pad tightening should be controlled at 1/3 left. The carbon steel flange sealing surface should be flat and clean, and the oil and rust should be carefully arranged during the installation.

(2) The apron of the aluminum flange from the Flange Manufacturer and the specification are placed in the receiving high and low grooves in any direction and the big head, and the device that is not to be distorted should be neglected to reflect, and if the result is formed and the mouth is formed, the refined steel must be carried out. The ladle will be injected into the center bag by verifying that it is applied above the bag inlet.

(3) The gasket should have excellent oil and aging resistance, as well as good elasticity and mechanical strength.

The device should be replaced with a gasket of different cross-section and size according to the shape of the joint and placed correctly. The maintenance of the aluminum flange shall be kept clean, the dirt shall be removed, and if it is corroded or contaminated, it may be wiped with a soft cloth with alcohol, washed with water, and not cleaned with acid or alkaline. The agent should be cleaned with warm water with a lubricant or a neutral detergent. This will ensure its normal use.

I hope this helps you. We offer a variety of plumbing fittings, such as the Straight Tee , Weld Bend, ect. If you are interested, please feel free to contact us!

Steel Pipe Manufacturing Process

Steel pipe such as the Carbon Steel Tee manufacturing process: 

(1) Forming (welding)

Forming is an indispensable process for the manufacturing process of all pipe fittings.

(2) Heat treatment

Through the heat treatment steps of heating, heat preservation and cooling, the work hardening, residual stress, metal deformation defects, etc. generated during the forming process are eliminated, and the metal structure and properties of the formed pipe are changed, and the state before the deformation process or the performance can be restored. Improve and improve.

(3) Surface treatment

The surface treatment of the pipe such as the Stainless Steel Elbow is usually carried out by sand blasting, shot blasting, sanding, pickling, etc. to remove rust, scratches, etc. on the surface of the product to achieve a smooth surface.

(4) Cutting processing

The cutting process is a process of completing the welding end portion, the structural size, and the shape tolerance of the pipe such as the Weld Neck Flange.

(5) Non-destructive testing

Non-destructive testing is an important process for testing defects in materials and fittings.

(6) Surface protection

For the surface protection of carbon steel and alloy steel pipe parts, the method of painting is usually adopted, and the method of passivation after pickling is applied to stainless steel.

(7) logo

Marks are an integral part of the product and are the basis for achieving traceability requirements.