Top 12 Types of Pipe Fittings and Their Functions Explained

Have you ever been under your sink in the kitchen or on the side of a large industry building and wondered how all those pipes could be connected? It appears to be a huge, mechanical jumble. There is no decoration of those connections; they are the joints and the muscles of any piping system.

In this guide we are going to discuss the top 12 types of piping fittings you must know. They can be used when you are simply repairing a leak in your house or are developing a huge factory pipeline; this knowledge of these components is the key to having a successful project.

Quick Comparison Table of the Top 12 Types of Pipe Fittings

The following table provides an overview of the most common types of pipe fittings, their primary functions, and their locations of the commonly used uses in actual piping systems.

Why Pipe Fittings are Essential in Pipe Systems

Imagine a pipe as a translator. A pipe may sometimes be required to make a curve, yet the pipe is straight. On other occasions, a big pipe must share its water with a smaller pipe. You would have no fittings in your plumbing and then the plumbing would be one long straight line running nowhere of use. 

The fittings are important, as they

• Change Direction: They assist the pipes in going around walls and floors.
• Control Flow: They are able to prevent, initiate or separate the liquid or gas that is flowing through the system.
• Connect Different Sizes: They are used in between large and small pipes.

What are Pipe Fittings?

In simple words, a fitting is an important component in a piping system, which is used to connect straight pipe sections. They are the bridges that create a complicated network.

Why We Use Them in Plumbing

Plumbing is not simply about the transportation of water, but it is about the safe movement of water. Fittings give control over the flow of water such that it does not break out of your faucet too fast. They allow adjusting the size of the pipes to sustain pressure and simplify the task of maintenance and repair. When one part of the pipe fails, it is usually possible to replace a fitting only but not to replace the entire line.

Common Materials

Fittings are of many materials depending on what should be flowing inside (water, gas or chemicals):

• Нержавеющая сталь: Powerful and it does not rust.
• Латунь: Is a nice one and suitable for high temperatures.
• PVC: Plastic that is used as a drain.
• Медь: The home water line gold standard.
• Cast Iron: Extra heavy construction of underground waste lines.

How Pipe Fittings Work in a Pipe System

Fittings are attached to pipelines with threads, glue or welding. After installation, they have to keep the system pressure. A failure in a fitting causes the entire process to lose pressure, resulting in bursting leaks or even explosions in industries.

You will have these fittings all about:

• Residential Plumbing: Your shower, your toilet, and your kitchen sink.
• Industrial plants: Plants that manufacture food or medicine.
• Нефти и газа: Massive pipelines through whole nations.
• HVAC: The heating and air conditioning that make your house cozy.

12 Types of Pipe Fittings

Knowledge of the various types of pipe fittings will assist engineers, plumbers and other people associated with construction to create safe and efficient piping systems to be used for residential and industrial purposes.

1. Elbow Pipe Fittings

Elbow fitting is considered to be one of the most widely used parts of any piping system. This fitting, as the name implies, takes the shape of a curved arm that enables a pipe to bend.

What it Does

An elbow alters the flow of the fluid in the pipe. The absence of elbows would only allow piping to be done in straight lines and this would render most of the plumbing and industrial systems impossible to construct.

Types of Elbows

The elbows come in a variety of angles depending on the extent of the direction change required by the pipeline.

• 90 Degree Elbow: Forms a right-angle turn.
• 45 Degree Elbow: Gently turns around and minimizes the loss of pressure.
• 180 Degree Elbow: This is a U-turn that reverses the flow in the opposite direction.

Материалы

Manufacturers make elbows out of stainless steel, PVC, brass, copper and carbon steel.

Приложения

The fittings of the elbow will be met with in numerous places and they are

• Household plumbing systems
• HVAC piping systems
• Industrial pipelines
• Water supply networks

For Example: where a pipe has to turn off the floor and on the wall or even around a beam of the structure, then an elbow fitting can manage that bend.

2. Tee Pipe Fittings

A tee fitting is so named due to its shape since it resembles the letter T perfectly. It joins three pipes to each other and assists in the formation of branch lines on a piping system.

What it Does

A tee fitting is designed with an inlet and two outlets or it may be designed as a combination of two flows in a single line depending on the direction of the fluid.

Functions

There are two significant functions of this fitting.

• Breaks one composite flow into two pipes.
• Conjugates two fluid streams to a single pipeline.

Types

• Equal Tee: The diameter of all the openings is equal.
• Reducing Tee: This is a branch outlet that is smaller than the main pipe.

Приложения

Tee fittings are very important in water distribution systems.

For Example: here is that one major water pipe that leads to a house and a tee fitting is used to divide the water supply and they include a pipe to the kitchen and another to the bathroom. Tee fittings are also prevalent in irrigation systems, chemical plants and industrial piping systems.

3. Coupling Pipe Fittings

One of the simplest types of pipe fittings is a coupling, which, however, holds a very significant role in the connection of pipelines.

What it Does

A coupling is a pipe connection between two pipes of identical sizes in a linear form. It is a sheath that grips the two ends of the pipe.

Types

Couplings are of two major types:

• Full Coupling: Connects two pipes fully.
• Half Coupling: This is welded on a large pipe to form a smaller outlet.

Functions

Couplings are useful in a number of tasks:

• Prolonging the duration of a pipeline.
• Replacing broken pieces of pipes.
• Permanent connection of pipes.

Приложения

The common uses of couplings are

• Household plumbing services.
• Water supply systems.
• Industrial pipelines.

In the case of a pipe that is short and damaged, another section of the pipe can be attached using a coupling and the system can be restored in a short time.

4. Union Pipe Fittings

A fitting that is a union resembles a coupling but has an important added feature: easy disassembly.

What it Does

The union is used to connect two pipes; however, in the center of the union, there is a special nut. It is possible to separate the pipes without cutting them by unscrewing this nut.

Преимущества

Union fittings have a number of benefits:

• Easy installation.
• Quick pipe removal.
• Basic service and repairs.

Компоненты 

A normal union fitting comprises three components:

• A nut
• A female end
• A male end

Приложения

Union fittings are normally fitted in the places where there might be a need for maintenance, including:

• Water pumps
• Industrial machines
• Filtration systems

As an Example: when a pump requires cleaning or changing, the union fitting would enable the technicians to easily remove the pipe without breaking the system.

5. Reducer Pipe Fittings

All piping systems do not have the same size of pipes across the whole system. Here there comes the necessity of reducers.

What it Does

A reducer is used for bridging pipes of varying diameter. It gradually reduces the size of the pipes to ensure that fluid flows smoothly.

Types

A: Concentric Reducer

• Cone-shaped design.
• Maintain the alignment of the two pipe centers.
• Applied in the vertical piping system.

B: Eccentric Reducer

• One side is flat.
• Opposes trapping of air bubbles.
• Commonly applied in the horizontal pipelines.

Functions

Reducers help:

• Control fluid velocity.
• It is important to maintain the appropriate pressure levels.
• Connects pipelines to machines having smaller inlets.

Приложения

The reducers are usually employed with:

• Processing implants in industries.
• Chemical pipelines.
• Pump systems.
• Oil and gas facilities.

6. Bushing Pipe Fittings

A bushing fitting is similar to a reducer except that it is in a smaller form.

What it Does

A screw is replaced with a bushing that will fit into a bigger pipe and shrink the opening.

Functions

Bushing allows you to:

• Link minor pipes with the larger pipes.
• Adjust pipe size quickly.
• Reduce the space in narrow installations.

Преимущества

Bushings are smaller in size compared to the reducers; hence, they can be used in space-limited areas.

Приложения

Bushings are found commonly in 

• Plumbing systems in residential buildings.
• Water filtration equipment.
• Industrial piping setup.

They offer an inexpensive and easy way of changing the size of the pipes.

7. Cross Pipe Fittings

The cross fitting resembles a plus sign (+) and joins four pipes.

What it Does

A cross fitting contains an inlet and three outlets; thus, the fluid may flow in a variety of directions.

Functions

This fitting supplies the flow of fluid in four pipeline branches.

Преимущества 

Cross fittings assist in simplifying complicated pipeline designs in which multiple lines would be required to join at a single central location.

Приложения

The cross fittings are largely used in:

• Fire sprinkler systems.
• Water distribution systems in industries.
• Irrigation systems.

For Example, In a fire sprinkler system, cross fittings are used to spread water in a few lines of a sprinkler set in the ceiling. In a very short time.

8. Cap Pipe Fittings

A pipe cap is a cap that covers a pipeline.

What it Does

It is the place on the trip of a pipe and covers it completely.

Functions

Caps serve several purposes:

• Stop the flow of fluid.
• Shield pipe ends against destruction.
• Seal up the unused pipeline lengths.

Материалы

Pipe caps are often made from:

• Нержавеющая сталь
• Латунь
• ПВХ
• Углеродистая сталь

Приложения

Caps are applicable in numerous cases, of which they are:

• The temporary pipeline blockages.
• Pressure testing systems.
• Future pipeline extensions.

For Example: When engineers are intending to expand a pipeline in the future, they would have the option of capping the pipeline until the next constructive period.

9. Plug Pipe Fittings

The pipe plug is similar to a pipe cap, except it operates differently.

What it Does

Rather than enveloping the outside of the pipe, a plug is inserted into a threaded pipe opening.

Functions

Pipe plugs are used to:

• Seal pipe ends.
• Close unused outlets.
• Prevent leaking of fluids during service.

Types

Common plug designs include

• Square-head plugs
• Hex head plugs.
• Round-head plugs.

Приложения

Pipe plugs are widely used in.

• Plumbing repairs.
• Maintaining industrial equipment.
• Oil and gas pipelines.

They offer a good seal and do not leak during the maintenance of the system.

10. Nipple Pipe Fittings

A pipe nipple is a short part of a pipe, which has threads on each end.

What it Does

It joins two fittings of a pipe or makes a pipeline a little bit extended.

Functions

Pipe nipples serve as a connector between fittings that are mounted very close to each other.

Types

Types of variations of nipples are

• Close nipple
• Hex Nipple
• Barrel nipple

Приложения

Pipe nipples commonly occur in:

• Gas distribution systems
• Water heaters
• Plumbing installations in residential houses.

They are small and can be easily installed, making them flexible to give connection options.

11. Adapter Pipe Fittings

One of the most commonly used fittings in the piping systems is adapters.

What it Does

An adapter will be used to connect pipes of different types or materials of connections.

Functions

Adapters help with:

• Turning feminine threads into male ones.
• Attachment of plastic pipes to metal pipes.
• Making diverse pipe standards.

Преимущества

Adapters insured increased flexibility of piping systems since they enable the components to work with one another.

Приложения

The adapters are found in numerous installations, such as:

• Residential plumbing
• Connections of industrial machinery
• Water filtration systems.

They resolve any compatibility issue between various pipe materials or thread styles.

12. Flange Фитинги

Flanges are robust pipe fittings, which are applied in piping systems of high duty.

What it Does

A flange is a flat, rounded plate that fastens the pipes with the help of bolts and a gasket between the two flanges.

Functions

Flanges provide:

• Strong pipe connections.
• Leak-proof sealing.
• Maintenance is easily disassembled.

Преимущества

Contrary to the welded joints, the flanges enable the technicians to dismantle the pipes and reattach them with ease using bolts.

Приложения

Flanges are widely used in:

• Oil and gas pipelines.
• Chemical plants.
• WAter treatment facilities.
• Power generation plants.

Large industrial pipelines are dependent on flanges due to the high pressure, temperatures and heavy load that they can sustain.

How to Choose the Right Pipe fittings

The inappropriate choice of fitting results in leaks or even bursts. Remember the following four things:

• Материал: Make sure that the fitting fits the pipe. When some metals (such as copper and steel) are mixed with each other, they may rot by a process called electrolysis. 
• Размер: Measure twice! The slightest 1 mm gap will ensure a non-sealing fitting.
• Pressure and Temperature: Hot steam needs to have much stronger fittings compared to the coldness of garden water.
• Приложение: Will it be a sink in the home or a chemical plant? Industrial jobs should always be fitting using industrial-grade fittings.

Common Applications of Pipe Fittings in Industries

• Строительство: Each building must have water in and waste out.
• Нефти и газа: This involves transporting fuel between continents, which involves high-pressure steel fittings.
• Water Treatment: The dirty water is transformed into clean water with thousands of tees and elbows.
• HVAC: The air conditioner has small copper fittings where refrigerant gas is moved.

Преимущества of Using High-Quality Pipe Fittings

Good fittings are cost-effective in the long run. The good-quality parts eliminate leakages to save your property from water. They also wear out a lot later; that is, you do not have to crawl under the house fixing them year after year. The most important thing is that they enhance the performance of your system by ensuring the pressure does not fluctuate.

Pipe Fittings Installation Tips

• Check the Size: Before commencing, it is always best to check it by diameter.
• Use Sealing Materials: Apply teflon tape or pipe dope on threaded connections to avoid any small gaps.
• Follow Pressure Ratings: Do not use a low-pressure PVC fitting on a high-pressure gas line.
• Inspect Often: Once installed, operate the system and check the system to see whether it is not sweating or dripping.

Conclusion: Selecting the Best Types of Pipe Fittings for Industrial and Plumbing System

With the knowledge of these 12 types of pipe fittings, you will have a new perspective of the world of plumbing and construction. The simple elbow to the heavy-duty flange, all these parts have a particular purpose of ensuring that our water, gas and heat remain safe in their movements. The difference between a system that will last decades and one that fails in a week is in the choice of the fitting. 

В HDC manufacturing we assist with industrial projects through the fabrication of custom metal pipe fittings that are designed to be used in harsh conditions. The combination of metal casting, precision forging and high-tolerance станки с ЧПУ is made to produce high quality durable components with tight tolerances and predictable production. This will enable us to tailor fittings to other dimensions, materials, and industrial uses. You can find solutions to high-quality forged pipe fittings or to custom-made metal components in your next project here:

https://hdcmfg.com/product/forging/pipe-fitting/ 

Our engineering team also collaborates with customers to provide them with fittings of high quality made to the exact dimensions required by the industry. Do you need to build a more effective and safer piping system? You need any kind of specialized designs or a big-scale production, we are willing to assist you in the process.