Checking Flanges Regularly

Flange connection refers to the two pipe, pipe fittings or equipment, the first of their fixed in a flange plate, the two flange, with the pad, with bolts to fasten them together, complete the connection. Some pipe products and equipment have own flange plate, also belong to the

flange connection. Flange is divided into threaded flange and welding flange, it is a kind of disk shaped parts, in the pipeline project is the most common, the flange is used in pairs. In the pipeline project, the flange is mainly used for the connection of the pipe. In the need to connect the pipe, a variety of installation of a flange plate, low pressure pipe can be used wire connection flange, 4 kg or more pressure on the use of welding flange. Low voltage and small diameter wire connecting flange, high pressure and low pressure and large diameter are welded flange, the thickness of the flange plate of different pressure and the connecting bolt diameter and the number is different. Flange is not produced corrosion, pitting, corrosion or wear, and is one of the highest strength of the materials used in building materials. Because the stainless steel has good corrosion resistance, so it can make structural components to maintain the integrity of Engineering design.

Flanges can not be stored for a long time, should be regularly inspected, often on the exposed machined surfaces shall be maintained in a clean, remove dirt, neatly stored in indoor and ventilated and dry place, stacked or open storage is prohibited. Flange of the ball valve, globe valve, gate valve is used, only for fully open or fully closed, do not agree to do to adjust the flow, so as to avoid the sealing surface by erosion, accelerated wear and tear. Materials of the flange is convenient, simple manufacture, low cost, wide use; but less rigid. Therefore, it cannot be used for supply and demand, flammable, explosive and high vacuum degree requirements of chemical process piping system and height, is extremely harmful to the occasions. Seal type plane and surface process. The flange has the advantages of simple structure, small volume, light weight, compact and reliable, the current valve sealing surface material widely used plastic, sealing, in the vacuum system has also been widely used; easy maintenance, valve structure is simple, seals are generally activities, the removal of the replacement is more convenient; in the fully open or fully closed, the ball and seat sealing surface and the dielectric isolation.

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Usage Notes for Flange Product

Notes for flange product use:

1. In order to prevent corrosion of eye is generated due to a flange cover heating, welding current should keep shoulds not be too big, than carbon steel electrode less than 20%, arc shoulds not be too long, interlayer fast cooling, a narrow weld bead is appropriate.

2. The use of the electrode should be keep the drying, titanium calcium type should keep drying 150 DEG C for 1 hour and a low hydrogen type should be kept between 200 and 250 DEG C and dried for 1 hour, prevent electrode viscous oil and other dirt, so as not to cause the weld increase with carbon content, and the influence of welding quality.

3.  Flat welding flange pipe welding by repeated heating and carbide precipitation and reduce the resistance and the mechanical properties of the corrosion properties of the product.

4.  Chrome flange pipe after welding of flange American Standard hardening is large, easy to crack. If the same type of chromium stainless steel welding rod (G202, G207) welding, must be more than 300 degrees above the preheat and 700 degrees after the cooling treatment. If can not carry out welding welding after heat treatment, should use the flange pipe electrode (A107, A207).

5.  Flat welding flange, in order to improve the corrosion resistance and welding and appropriate to increase the amount of stability of Ti, Nb, Mo, better than chromium flat welding flange welding. Using the same type of chromium welding flange welding rod (G302, G307), after more than 200 DEG C of preheating and welding 800 DEG C tempering treatment. If the welding conditions can not be heat treatment, should use the flange pipe electrode (A107, A207).

The main function of flange:

1. Connect the line and keep the sealing performance;

2. To facilitate the replacement of a section of the pipeline;

3. Easy to open and check the pipeline situation;

4. To facilitate the closure of a certain section of the pipeline.

How to make the pipe fittings more resistant

When a piping project not works well, the steel pipes and pipe fittings are always facing the wear resistant problem ,especially when some impurity, sands,slurry in the flowing liquid .  Some technical measures should be taken to reduce wear and tear about pipe and fittings .

1.We should assess the liquid condition when choose the steel material of the pipe fittings . Should we use the common steel material?  or the wear resistant steel ? or should we arrange the wear resistant coating or lining materials? cement lining or ceramic lining?

2. The special treatment for pipes or pipe fittings. For example , the steel elbows. The outer radius of the elbow is grinded most seriously,  we can add some thickness to this part of the elbows.  This is also happened to other pipe fittings, like tees , reducers.

3. To the steel pipes , concentric reducers and caps ,  they can rotate in any degree and piping system . When they are in the horizontal direction ,  due to wear of the maximum bottom, on both sides, followed by the top of the minimum, therefore, the pipes an fittings could periodically inverted, it will extend the life of the piping system .

4.The position, direction and the angle of the pipe fittings also will effect the abrasion situation . If the position is not suitable , the flowing liquid will cause cavitation. The cavitation will speed up the abrasion of the pipings