what is a flexible coupling

How do you connect flex pipe to a copper tubing?

• Every connection must have one male fitting and one female fitting in order for the two fittings to attach. ...
• The sizes of the threaded ends must match in order for the PEX fitting to twist onto the copper pipe fitting.
• You can connect pipes of different sizes as long as the threaded ends are the same size. ...

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What is the purpose of pipe coupling?

• To provide a leak-proof disconnection point in any piping system.
• Used for inserting metering and regulating devices into any plumbing application.
• Can connect piping system to vessels.
• Can join two pipes of different size together.
• Can easily remove the join between two pipes.
• Easy to install.
• Economical.

What is PVC expansion coupling?

What is a PVC expansion coupling? Expansion Fitting is designed to compensate for length changes due to temperature variations in exposed conduit runs. Made of nonmetallic PVC for durability. The fitting has a 2-piece molded design with lubricated seals to provide easier movement throughout the life of the product. The coupling is compatible with Sch.

How to use fernco couplers?

PVC to Cast Iron Hook-UP Just put the two pipes together, slide the fernco onto one pipe and then side the fernco on to the other pipe until they are about equal [ you may need soap to help make this easier], tighten the bands, make sure that you don’t kink the line. Do Fernco couplings meet code? How long do Fernco couplings last?

What is a flexible coupling is used for?

The function of a flexible coupling is to transmit torque from the driver to the driven machine while making allowances for minor shaft misalignment and shaft end position changes between the two machines.

Which is flexible type of coupling?

Gear coupling However, it is a flexible type of coupling and can be used for non-collinear shafts. Gear couplings accommodate angular misalignment of about 2 degrees and parallel misalignment of 0.25…0.5 mm.

What is flexible element coupling?

Flexible element couplings accommodate misalignments by flexing of one or more elastic, torque-transmitting elements, and consequently their main advantage is that, by avoiding sliding or rolling contacts, they do not require lubrication or maintenance.

What is the most important use for a flexible coupling?

Flexible couplings are utilized to transmit torque starting with one shaft then onto the next when the two shafts are marginally misaligned.

What are the examples of flexible coupling?

Material flexing couplings typically do not require lubrication and operate in shear or compression and are able to accept angular, parallel and axial misalignment. Examples of material flexing couplings are jaw, sleeve, tire, disc, grid and diaphragm couplings.

What is the difference between a coupling and a flexible coupling?

1:082:18Compare the Parts: Rigid Coupling v. Flexible Coupling - YouTubeYouTubeStart of suggested clipEnd of suggested clipA flexible coupling is used to connect two shafts end to end in the same. Line flexible couplingsMoreA flexible coupling is used to connect two shafts end to end in the same. Line flexible couplings can be used to transmit power from one shaft to another and to compensate for small amounts of

What is the difference between a rigid and a flexible coupling?

A flexible coupling is where the shafts are connected by a flexible joint, which allows transmitting torque from one shaft to another when the two shafts are misaligned and they move independently of each other. In a rigid coupling, the two parts are connected together with high strength.

How do you determine a flexible coupling?

The necessary tools used for checking the alignment of a flexible coupling are a straightedge and a taper gauge or a set of feeler gauges, or by use of dial indicators. A rough check for angular alignment is made by inserting the taper gauge or feelers between the coupling faces at 90 degree intervals (see Image 2).

What is flexible coupling in pipe?

Essentially, a flexible pipe coupling is used to connect two shafts in a more effective manner. In turn, this enables easy and efficient disposal of waste and other materials. This makes it a fantastic upgrade for any piping system.

Do I need a flexible coupling?

If you've got misalignment and your coupling is not addressing that misalignment, you're going to have problems, either with broken couplings or bearing failures, and again, if you've got misalignment present in your system, no doubt, you need a flexible coupling to solve those issues for you.

How do you install a flexible coupling?

0:001:42How to install a fernco coupling.(2021) - YouTubeYouTubeStart of suggested clipEnd of suggested clipTo install a furniture coupling you're going to need a 5 16 socket or a flat screwdriver i recommendMoreTo install a furniture coupling you're going to need a 5 16 socket or a flat screwdriver i recommend the 516 socket firm codes are usually used to connect plastic to galvanized or cast iron.

Which is the flexible coupling Mcq?

Bushed pin type coupling.

Is gear coupling a flexible coupling?

Despite the fact that one may not consider gears being flexible, gear couplings are particularly viewed as a flexible coupling. A gear coupling is a mechanical device intended to transmit torque between two shafts that are not collinear. The coupling commonly comprises two flexible joints, one fixed to each shaft.

Is universal coupling a flexible coupling?

Universal coupling is type of flexible coupling.

Is chain coupling flexible coupling?

Chain couplings are three-piece flexible shaft couplings that are used to connect driving and driven shafts in mechanical power transmission assemblies. Flexible shaft couplings are used to counter the inevitable misalignment that occurs between connected shafts.

Why does lubrication cause teeth to lock in position?

In addition to accelerating wear, lack of lubrication may cause the teeth to lock in position. This reduces coupling tolerance for misalignment and may increase machine vibration.

How to study coupling dynamics?

To study the rigid–flexible coupling dynamics behavior of the modeling methods, numerical simulations are conducted using MATLAB software. The linear and nonlinear models undergoing a large overall motion are studied, and comparisons between the two cases dynamics models are given. Based on the linear elastic theory, the nonlinear terms of K g and ⁎ K ξ ⁎ in Eq. (9.46) are ignored in the linear model. However, these terms are considered in the nonlinear model. Figs. 9.5 and 9.6 show the transverse and longitudinal deformation of linear and nonlinear models (measured with respect to the end-shaft frame Σ e) at point P, which is located at the end of the reflector along the x -direction. From 0 to 8.5 s, it can be seen that the transverse and longitudinal deformation results obtained by the linear model are in good agreement with those obtained by the nonlinear model, and the two models can get a convergent solution, but the peak value of the deflection in the nonlinear model is a little smaller than that of the linear model. With the increase of the angular velocity, when θ ˙ 1 = 2.72 rad / s and θ ˙ 2 = 3.25 rad / s, it is shown that the linear model provides an improper divergent response. The lack of the nonlinear stiffness variation terms of K g and ⁎ K ξ ⁎ in Eq. (9.46) caused the improper estimation. The stiffness of the system decreases as the velocity dependent nonlinear term c ξ increases. When it increases to a critical value, the negative stiffness in the linear model leads to improper divergent response. However, in the nonlinear model, due to the effect of the geometrically nonlinear kinematics of deformation, the coupling term of deformation is added into the transverse and longitudinal deformation field. Hence, we can obtain a “stiffening” shell structure of the reflector. All of these facts will contribute to the difference of the deflection of point P between the linear and nonlinear models. Therefore, the nonlinear model can achieve convergence even undergoing a large overall motion.

Why is flexible coupling important?

Choice of flexible coupling can be important. Tradition and price are the two most often used criteria, and either can result in a poor choice. For most pumps, it is desirable to use a spacer coupling. This gives more parallel misalignment capability than a close coupling of the same type and also provides better access for maintenance.

What is flexible coupling?

Flexible couplings permit some degree of misalignment and isolation of vibration and are specified for connecting the input and output shafts of the transmission to the motor and compressor.

What is Metastream flexible coupling?

Metastream Flexible couplings are designed to accommodate the inevitable displacement which occurs between the centre lines of two rotating shafts. Flexible elements are in the form of membrane banks, usually made of stainless steel or other corrosion-resistant materials. As all flexing occurs within the membranes, there are no wearing parts and therefore no necessity for lubrication, adjustment or any other form of maintenance. All Flexibox M, LS and T series membrane couplings incorporate spacer-retention anti-fly devices.

What happens if you misalign a flexible coupling?

Misalignment of flexible couplings can lead to excessive force on either the motor or the driven load. This can lead to failure of other components or large amounts of vibration. Tip – Even if flexible couplings are used the alignment of the motor and the load should be regularly checked.

What is the M series?

M series ‘spoke form’ membrane couplings The flexible element of the M series is a bank of spoked membranes secured rigidly at their inner and outer diameters. Designed for low-, medium- and high-speed operation, the M series design meets the API 610 specification and is particularly suitable for process pump applications. The axial stiffness of the M series membrane unit is strongly non-linear, making it inherently self-damping and therefore ideal for unlocated rotor motor applications without recourse to end stops.

What is a mechanical flexible coupling?

A common type of mechanical flexible coupling is gear coupling. Each coupling consists of two hubs with crowned external gear teeth. The hubs mesh with two internally splined flanged sleeves that are bolted together. They are called gears as a result of the generally huge size of the teeth. These couplings are commonly constrained to precise misalignments of 4° to 5°.

What is a bellows coupling?

Bellows couplings are single-piece flexible shaft connectors that are used to couple driving and driven shafts in mechanical power transmission assemblies. They consist of two hubs connected by a flexible bellows section. Typical bellows couplings tolerate angular misalignment of 1° to 2° and parallel misalignment from 0.01 to 0.02 in. Bellows couplings are known for their exceptional torsional rigidity to accurately transmit velocity, angular position, and torque.

What is a zero backlash coupling?

These couplings can accommodate parallel misalignments up to 0.025 inches and angular misalignments up to 7 degrees. They are used primarily for motion control applications where torques are typically below 100 inch-lbs. Zero backlash designs available ensure positioning accuracy between driving and driven shafts. These types of flexible coupling generally feature excellent flexibility and a lower price, as well as zero need for maintenance.

How much rpm does an elastomeric coupling use?

Due to the limitations of the flexible element, this type of coupling is used up to 37 kW and 3600 rpm.

How does Oldham coupling work?

Oldham’s couplings consist of three discs, one coupled to the input, one coupled to the output, and a middle disc that is trapped by 90° displaced grooves between the tongue and groove. These couplings can accommodate lateral shaft misalignments up to 10% of nominal shaft diameters and up to 3 angular misalignments. Some manufacturers claim an ability to tolerate up to 5-degree angular misalignment through the use of cylindrical, rather than rectangular, sliders. Lubrication is a problem but can be overcome by choosing a wear-resistant plastic or an elastomer in place of steel or bronze floating members.

What is grid coupling?

Grid couplings are multi-piece mechanical couplings used to transmit torque and rotation between shafts in mechanical power transmission assemblies. Grid couplings are comprised of two radially slotted hubs, a grid spring element, and a split cover kit. These types of flexible coupling are a popular option where both high torque levels and dampening requirements exist.

How long does a gear coupling last?

The gear coupling provides good torque characteristics. Gear couplings transmit the highest amount of torque and the highest amount of torque in the smallest diameter of any flexible coupling. Gear couplings require periodic lubrication depending on the application. These couplings have a service life of 3 to 5 years and in some cases, they can last for decades.

What is the exception to the American Gear Manufacturers Assn.?

The exception to this is the American Gear Manufacturers Assn. standards applicable in North America for flangedtype gear couplings and the bolt circle for mating the two halves of the couplings. The American Petroleum Institute has standards for both standard refinery service and special purpose couplings.

What are the two main groups of flexible couplings?

Initially, flexible couplings divide into two primary groups, metallic and elastomeric. Metallic types use loosely fitted parts that roll or slide against each other or, alternatively, non-moving parts that bend to take up misalignment. Elastomeric types, on the other hand, gain flexibility from resilient, non-moving, rubber or plastic elements transmitting torque between metallic hubs.

What are coupling service factors?

Coupling service factors are intended to compensate for the variation of torque loads typical of different driven systems and to provide for reasonable service life of the coupling. If chosen too conservatively, they can misguide selection, raise coupling costs to unnecessary levels, and even invite damage elsewhere in the system. Remember that properly selected couplings usually should break before something more expensive does if the system is overloaded, improperly operated, or somehow drifts out of spec.

What is a flexible coupling?

A flexible coupling exists to transmit power (torque) from one shaft to another; to compensate for minor amounts of misalignment; and, in certain cases, to provide protective functions such as vibration dampening or acting as a “fuse” in the case of torque overloads. For these reasons, industrial power transmission often calls for flexible rather ...

Why does a torque transmitting element break?

In elastomeric couplings, breakdown of the torque-transmitting element most often results from excessive heat, from either ambient temperatures or hysteresis (internal buildup in the elastomer), or from deterioration due to contact with certain oils or chemicals.

Does a coupling design extend the life of a bearing?

But, it might lead you to something totally different that will work better and last longer. A different coupling design may also extend the life of bearings, bushings, and seals, preventing fretted spline shafts, minimizing noise and vibration, and cutting long-term maintenance costs.

How to Select a Flexible coupling for any application?

To select any above couplings following are the necessary steps that will be considered.

What is a bushed pin coupling?

It is a simple type of coupling with two flanges bolted with the help bolt and nut covered by bush made up of rubber. Check the Bushed pin type coupling picture. These couplings are torsionally rigid and also accommodate all three misalignments. Because of its simple design, these are less expensive.

What is a torsional coupling?

Torsional couplings. Torsional couplings. Torsional couplings are mostly to accommodate the torsional vibration. Most of these are rubber coupling where it can dampen the vibrations and also accommodate the misalignments. Also, spring torsional couplings are also available as the torsional couplings.

Which couplings can accommodate all three misalignments?

Diaphragm couplings can accommodate all the three misalignments. It can accommodate more range of misalignment axially.

What is flexible coupling?

Flexible couplings are used to connect two shafts having axial, radial and angular misalignment. Following are the different types of flexible couplings. Gear coupling.

What is disc coupling?

The disc coupling is having a thin sheet of discs laminated as the main part of the coupling for the flexibility to accommodate the misalignments.

How many members are in an old ham coupling?

Old-ham coupling usually provides a huge amount of parallel misalignment. It consists of three members. There is a floating member trapped in between the other to members by means of 90° grooves on both sides o the floating member. Check out the picture of the Old -ham coupling.

Features

Flexible couplings, suitable for medium pressure occasions, have different calibration pressures corresponding to different nominal diameters. After connecting the pipe with a flexible clamp, the pipe is allowed to have partial axial displacement and corners, so that the pipeline system is in a flexible state.

Application

Flexible couplings are suitable for petroleum, mining, chemical, municipal, construction, and metallurgical industries.

Flexible Coupling Types

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Flexible Coupling Applications

How to Select A Flexible Coupling For Any application?

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