When Do We Use Slip-On Flange, A Weld Neck Flange Or A Lap Joint Flange

There are few types of flanges, but the most used types by ASME B16.5 are weld neck, slip-on, and lap joint flange.

Weld Neck Flange



These are easy to recognize at the long tapered hub. It goes gradually over to the thickness of the wall from a fitting or pipe. The long tapered hub provides an essential reinforcement for use in several applications that involve elevated, sub-zero temperatures or high pressure. The smooth transition from fitting or pipe wall thickness to flange thickness gets affected by the taper and is extremely beneficial under the conditions of repeated bending caused by the line expansion or other variable forces.
 

Slip-on Flange



The calculated strength from a slip-on flange under internal pressure is of around two-thirds of the Welding Neck flanges, and their life under fatigue is about one-third that of the latter.

The connection with the pipe is about 2 fillet welds, as well at the outside as also at the inside of the flange.

Lap Joint Flange

Lap Joint Flanges have all the same common dimensions as other flanges. They are used in conjunction with a ‘Lap joint stub end’. Lap joint flanges are nearly identical to the Slip-on flange with an exception of the radius at the intersection of the flange face and the bore to accommodate the flanged portion of the Stub end.


If you are thinking about when to use a lap joint, weld neck, or a slip-on flange, the answer to this question is mixed. First, the piping material engineer must make it clear about the type of flanges to be included in each line class specification.

The piping material specifications must not include every flange type in every line class. If lap joints are the flanges called for by the line class, you may only use lap joint flanges. For other line classes, you would usually use only weld neck flanges for all flange situations for 3” (NPS) and larger. The usage of a slip-on flange could be the only exception here when there is a space limitation problem.

Comments

Post a Comment

Popular posts from this blog

Importance of AWWA Flanges in Piping Systems

Image
AWWA flanges, also known as American Water Works Association flanges, play a very important function in piping systems used for water supply and treatment. These specialized flanges are designed to meet the high quality standards and requirements set by the American Water Works Association, that ensure the safety and reliable conveyance of water in municipal, industrial, and commercial applications. The importance of  AWWA flanges  lies in their ability to provide secure connections between pipes, valves, pumps, and other components, preventing leaks and ensuring the integrity of the water distribution network. By following and meeting the strictly established manufacturing standards and quality control measures, AWWA flanges help maintain the safety, efficiency, as well as sustainability of water supply networks, which helps in protecting or safeguarding public health, environmental protection, and economic development. 8 key points to understanding the importance of AWWA Flanges Unde
Read more

Stepping Into Flanges

Image
  The flange is one of the essential components required to connect two pipes. It helps in connecting the ends of two pipes through welding or threading. Flanges are classified into two main categories as per the attended modes: welded and  threaded flanges .  When you want to connect two pipes, you’ll need a pair of flanges, a gasket, and several nuts and bolts to complete the flange joint. First, put the gasket between the two sealing faces and then tighten the bolt. When the gasket surface pressure reaches a certain level, it deforms to fill the uneven parts of the sealing surface to achieve the perfect leak tightness. A flange joint   is usually a detachable link. It means the detachable components are divided into tube flanges and containers. If we look from the perspective of structure types, they are threaded, loose, and integral flanges. Butt and flat  welding flanges  are two general types of integral flanges. Flat welding flanges are applicable for working pressure with l
Read more

5 Common Valve Types Every Oil and Gas Engineer Should Know About

Image
A valve is a mechanical device in a piping system used to control the flow and pressure of contents – liquid, oil, vapors, or gas. Here is a list of 5  standard valves that every oil and gas engineer should know: #1. Ball valves It's a rotary motion quarter-turn valve. It uses a ball-shaped disk to control the flow of components flowing in the piping system. When you open the valve, the ball's holes come in line with the body inlet, allowing contents to pass. The ball valves can withstand a temperature between - 200 deg C and as high as 500 deg C. the best thing about this valve is that it’s a quick-acting type. Some of the different types of ball valves include: ·           Floating ·          Trunnion Mounted ·          3 Way ·          Top entry ·          Side entry or split body ·          Three-piece body #2. ARV or ARC valves 'Automatic Recirculation Valve' and 'Automatic Recirculation Control', are multifunctional valves. These v
Read more