Bellows expansion joint

Bellows expansion joints are great for accommodating axial, lateral and angular movements for a wide array of piping applications.

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Category: Expansion joint

Description

Bellows expansion joints are great for accommodating axial, lateral and angular movements for a wide array of piping applications.

Some applications may contain high flow velocities, which can induce severe vibration and lead to premature failure to the bellows element. The way to address this is to utilize a bellows expansion joint containing an internal sleeve, also known as a flow liner.

Expansion joint installation

The bellows of an expansion joint is manufactured from relatively thin material in order to provide the flexibility needed to absorb the specified movement. The life of the Expansion Can be shortened if the unit is improperly handled and / or installed. This can arise from direct physical damage to the bellows through stresses imposed during installation, or by the factors. Therefore some basic instructions must be followed having safe and proper installation of Expansion joints.

There are several other things to consider when choosing whether or not to use a flow liner. Due to lateral movements, the gap between the bellows and the internal sleeve must be designed appropriately in order to prevent contact or binding against the inside diameter of the pipe or fitting. Also, making sure the inside diameter of the internal sleeve does not create back pressure or restrict the flow of media is extremely important, and usually can be avoided by utilizing an oversize bellows.

Stainless steel bellows, as a flexible pressure-resistant pipe fittings, are installed in the liquid transportation system to compensate for the mutual displacement of the connecting ends of pipes or machines and equipment, absorb vibration energy, and can play the role of vibration reduction and silencing. They have many characteristics, such as good flexibility, light weight, corrosion resistance, fatigue resistance, high and low temperature resistance.

Details of bellows expansion joint

DN	Quantity of ripple	Pressure level Axial compensation length mm/toughness N/mm					Effective area of corruagated tube	Maximum external diameter(mm)
		0.25	0.6	1	1.6	2.5
32	8	25/21	22/26	20/26	18/63		16	225
32	16	1950-11-01 00:00:00	46/14	41/14	36/32		16	225
40	8	25/25	22/44	20/44	18/89	15/98	23	244
40	16	50/14	46/22	41/22	36/45	31/47	23	244
50	8	25/30	22/51	20/70	18/70	15/106	37	259
50	16	50/16	46/26	41/35	36/35	31/55	37	259
65	8	33/28	30/35	26/44	22/55	15/138	55	270
65	12	42/16	38/22	38/32	34/40	31/70	55	270
80	8	40/20	36/26	34/33	28/41	19/68	81	284
80	10	53/14	49/17	49/21	43/26	29/50	81	284
100	6	45/47	45/60	40/75	35/93	25/54	121	304
100	10	76/26	74/32	64/40	57/50	38/33	121	304
125	5	48/38	42/47	38/59	34/74	29/117	180	334

Metal bellows and expansion bellows for all applications

Our expansion joint fabrications offer flexibility on the axial, lateral, or angular planes, depending on your needs. They are highly resistant to tension and compression within set parameters, providing you with safe, efficient, and reliable operation over the lifespan of the product.

What is the function of stainless steel bellows expansion joint?

Stainless steel bellows expansion joint is the compensating elements installed in pipelines, machines and containers, we often call it compensator.

Stainless steel bellows expansion joint mainly has three basic movement types: axial movement, lateral movement and angular movement. What’s the function of stainless steel bellows expansion joint? Generally speaking the functions are absorbing vibration, compensating movement and absorbing noise. Please check below detailed information.

Absorbing piping vibration

On one hand, stainless steel bellows expansion joint can enhance the fatigue rupture capacity, on the other hand, it has function of reducing piping noise.

Compensating piping movement

Take rubber hose as comparison, rubber hose has good flexibility and strong anti-fatigue ability, but it is inferior in temperature resistance, pressure bearing, aging resistance than stainless steel bellows expansion joint, it always needs to be changed after using a few months. While metal bellows owns comprehensive performances of out-standing corrosion resistance, temperature resistance, pressure resistance, fatigue resistance, in some complex environment, stainless steel bellows expansion joint is the most ideal element to compensate piping movements.

Piping installation stress

Typical installation problems always seen in some complex piping systems, the problems always caused by limitation of space and location. According to different pipeline diameter and working environment, the cold straightening value differs from several millimeters to dozens of millimeters, even hundreds of millimeters. Practise has proved that the larger of the cold straightening value, the higher of the internal stress, internal stress is a hidden danger to the pipeline system. Since stainless steel bellows expansion joint is able to bend freely and generate minimize internal stress in rated bending radius, thus, it is extremely convenient for installation, that’s the reason why stainless steel bellows expansion joint is the essential pipe fitting for some pipeline systems.

What are Metal Bellows?

Metal bellows are elastic vessels that can be compressed when pressure is applied to the outside of the vessel, or extended under vacuum. When the pressure or vacuum is released, the bellows will return to its original shape (provided the material has not been stressed past its yield strength).

Expansion joints and metal bellows are vital components in a huge range of industrial settings. They play a vital role in equipment which needs to withstand high pressures, whether that is from gases or liquids. The units are designed to safely and reliably expand under pressure, and take prescribed temperatures in their stride. They can be formed from common metals such as stainless steel in various grades, and more exotic alloys such as Inconel can be used as per your requirements.

Metal bellow types

There are two main types of metal bellows – formed and welded. Formed bellows are produced by reworking tubes, normally produced by deep drawing, with a variety of processes, including cold forming (rolling), electroforming and hydroforming. They are also called convoluted bellows or sylphons.

Welded bellows (also called edge-welded, or diaphragm bellows) are manufactured by welding a number of individually formed diaphragms to each other. The comparison between the two bellows types generally centers around cost and performance. Hydroformed bellows generally have a high tooling cost, but, when mass-produced, may have a lower piece price. However, hydroformed bellows have lower performance characteristics due to relatively thick walls and high stiffness. Welded metal bellows are produced with a lower initial tooling cost and maintain higher performance characteristics. The drawback of welded bellows is the reduced metal strength at weld joints, caused by the high temperature of welding. Electroformed bellows can be produced with modest tooling costs and with thin walls (25 micrometres or less), providing them with high sensitivity and precision in many exacting applications.

Another area of comparison is in metals of construction. Hydroformed and rolled bellows are limited to metals with high plastic elongation characteristics, whereas welded bellows may be fabricated from a wider variety of standard and exotic alloys, such as stainless steel and titanium, as well as other high-strength, corrosion-resistant materials. Electroformed bellows can be produced of nickel, its high-strength alloys, and copper.

Metal bellow applications

Bellows, welded or convoluted (formed) are used in a large number of industrial applications. Below you will find a few：

Load cells-A load cell deforms if a certain load in the form of a pressure or a strain is imposed on it. This deformation is then detected by a strain gauge through which a low voltage direct current is flowing. The change in voltage is detected and made visible on a control panel. A bellows is mounted over the gauge to protect it from outside influences.

Vacuum interrupters-For the switching of very high voltages in transformer stations sparks should be avoided. To prevent any danger that the surrounding atmosphere will explode, oxygen has to be removed in the area where the sparks occur. This can be done by sealing the spark area completely. Bellows are used to seal such confined volumes and the inside of the bellows is evacuated or filled with an inert gas.

Mechanical Seals-These are mostly used to close the inside of a pump from the outside world to prevent leakage. For that purpose, a mechanical seal is mounted on the pump shaft. As the pump shaft is turning, there has to be a sealing element consisting of a stationary and a rotating ring. To enforce sufficient pressure on the two rings one is fitted with a spring. This spring can also have the form of a diaphragm (welded) bellow.

Pressure gauges-If the pressure of aggressive fluids or gases has to be measured, the gauge has to be isolated from the flow. For critical applications a diaphragm sealing is used instead of a bourdon tube in the gauge. This gives more security that the aggressive media will not leak. The diaphragm is a self contained sensor, transmitting the displacement to the measuring device.

Sensors- In this application diaphragm or convoluted bellows are completely sealed and filled with a certain gas. Two electrical poles are penetrating the inside of the bellows. By varying the current of those two poles the temperature inside the bellows can be regulated. The expansion or contraction of the bellows is used as an actuator to control a certain movement.

Valve Sealing- A bellows is used between the housing and the rising stem to seal the inside completely from the outside world. In Europe this is of particular importance as regulations such as TA Luft prohibit any leakage.

Couplings for stepper motors and servomotors- The flexible part, capable of compensating for misalignment is made by a bellows. It ensures that there is no angular positioning difference between the two coupling halves. This is essential if the positioning accuracy should be extremely precise.

Exhaust Bellows- Running engines cause self vibration. To compensate for those movements and temperature differences resulting in thermal expansion, bellows are used to connect the exhaust gas pipes to the funnel.

Piping expansion joint-In this application, bellows are formed in series to absorb thermal movement and vibration in piping systems that transport high temperature media such as exhaust gases or steam.

Metal bellows are also used in other products and market segments, including medical applications like implantable drug pumps, to industrial actuators, to aerospace applications such as altitude sensors and fluid management devices (accumulators, surge arresters, volume compensators, and fluid storage). Metal bellows are also found in space applications, providing reservoirs with potable water as well as accumulators to collect wastewater.

Reliable

Compensator reliability is by the design, manufacture, installation and operation and management and other aspects of the composition. Reliability should also be considered from these aspects.

Material Selection For the selection of corrugated pipe for heating pipe network, in addition to considering the working medium, working temperature and the external environment, the possibility of stress corrosion should also be considered, the impact of water treatment agent and pipe cleaning agent on the material, etc.,

Based on this, the corrugated pipe material is welded and formed, and the cost performance of the material is optimized. The economical and practical corrugated pipe material is selected.

Under normal circumstances, the use of corrugated pipe material should meet the following conditions:

high elastic limit, tensile strength and fatigue strength, to ensure the normal work bellows.
good plasticity, easy corrugated pipe processing and shaping, and can be followed by the treatment process (cold hardening, heat treatment, etc.) to get enough hardness and strength.
better corrosion resistance, to meet the bellows in different environments work requirements.
good welding performance, to meet the bellows in the production process of the welding process requirements.

For the laying of the heat pipe network, when the compensator is located in the lower pipelines, rain or accidental sewage will soak corrugated pipe, should consider the use of more corrosion-resistant materials, such as iron-nickel alloy, high-nickel alloy. Due to the high price of such materials, it may be advisable to add a corrosion-resistant alloy only to the surface in contact with the corrosive medium when making the bellows.

What different varieties of expansion joints are there?

In a piping system a Expansion joints alternately known as Bellows are like sealed springs. Sealed because it is required to contain the fluid pressure which is flowing through it and spring because it is required to respond to the movement of the connected piping without offering appreciable stiffness to the piping system.

An expansion joint/bellow element employed in a piping system is an assembly of generally more than one convolute in series. The convolutes are designed strong enough to withstand the internal pressure of the system, at the same time the typical contour of the convolute assembly allow sit to flex under thermal movement of the connected piping. As a result of this extreme flexibility the expansion joint / bellow as such is highly incapable of absorbing any longitudinal loads by its own,thereby requiring external attachments to transfer these longitudinal loads to its connected piping for maintaining the overall stability of the piping system under question.

Common types of expansion joints

Simple Expansion Joint
Universal Expansion Joint
Pressure Balanced Expansion Joint
Hinged Expansion Joint
Gimbal Expansion Joint

However should site conditions demand a unique solution then end connections can be adapted to most applications.

What is the difference between a bellows and an expansion joint?

The terms can be confusing since there is no universally accepted meaning. We usually use the following definitions, but the terms “bellows” and “expansion joint” are generally considered interchangeable:

Expansion joint: An expansion joint is a complete unit with metal, rubber or fabric bellows and end connections and accessories, as well as optionally, internal linings, outer covers, etc … Other terms used: compensator, flexible.
Metal bellows: it is the flexible element of metal expansion joint.
Rubber bellows: it is the flexible element of rubber expansion joint.
Internal lining: the internal lining goes inside the expansion compensator, underneath the metal bellows or the rubber bellows to prevent the circulating fluid from falling directly on the bellows. This reduces flow disturbance and allows the bellows temperature to be controlled in the design.

Types

Pipe expansion joints are also known as compensators, as they ‘compensate’ for the thermal movement.

Pipe expansion joints are necessary in systems that convey high temperature commodities such as steam or exhaust gases, or to absorb movement and vibration. A typical type of expansion joint for pipe systems is a bellows which can be manufactured from metal (most commonly stainless steel), plastic (such as PTFE), or an elastomer such as rubber.

A bellows is made up of a series of one or more convolutions, with the shape of the convolution designed to withstand the internal pressures of the pipe, but flexible enough to accept the axial, lateral, and/or angular deflections. Expansion joints are also designed for other criteria, such as noise absorption, anti-vibration, earthquake movement, and building settlement.

Tube – A protective, leak proof lining made of synthetic or natural rubber. The tubes primary function is to eliminate the possibility of materials being handled penetrating the carcass.

Carcass – The carcass or body of the expansion joint consists of fabric, and when necessary metal.

Cover – The exterior surface of the joint.

Fabric Reinforcement – The carcass fabric reinforcement is the flexibility and supporting member between the tube and cover.

Metal Reinforcement – Wire or solid steel rings imbedded in the carcass, often used for strengthening.

Retaining Ring – Used to compress the expansion joint flange to the mating flange to create a seal. Also called clamp bars or backing bars. Applies to most all expansion joints.

Mating Flange – Used to connect the pipe joint to the pipe in which it is being installed.

Control Rod – Used to limit the axial movements during operation, and prevent the joint from exceeding its movement capabilities. The rods attach the mating flange and expansion joint. Typically used on piping joints, but can be installed on most any joint when required.

Expansion joints are an assembly designed to safely absorb sound, expansion, con traction and vibration to ensure expansion jointsthat the application stays in fully working order.

When we apply this technique to pipe systems, we brand the term ‘pipe expansion joint’ or ‘bellows’.

These pieces of equipment are used in pipe work where movement, thermal expansion and much more could cause problems. The pipe expansion joints are made up from one or more convolutions, which are designed to move or expand to relieve the stress from the solid pipe. The amount of movement or expansion within the application will determine the number and shape of convolutions required. Expansion joints can be manufactured from a range of different materials, from stainless steel and PTFE, to rubber.

Pipe expansion joints are also designed for other criteria, such as noise absorption, anti vibration, earthquake movement and building settlement. Metal expansion joints have to be designed according to rules. Pipe expansion joints are used in a number of industries, including; oil, petrochemical and paper industries.

Pipe expansion joints are often manufactured to withstand temperatures from minus 300°F, up to 4000°F, as well as being able to resist at full vacuum or 2000 psig. Expansion joints can be manufactured from a range of different materials aforementioned. Before the introduction of pipe expansion joints, engineers were battling with the task of combating problems regarding thermal expansion, corrosion and abrasive factors that took effect on the functionality of various applications. Fabric joints can be used in a number of applications for turbines and pipelines, which can defend against resistance, heat and a range of other environmental factors.

Pipe expansion joints are crucial components in the pipe technology sector, which serve a huge number of industries. They are used to counterbalance length changes that generally occur in pipelines from temperature changes and can also absorb vibrations. It is a cost effective solution to increase the life span, reliability and costs of many applications through equipment and process management.

Types of metal expansion joints

Single unrestrained

This expansion joint is the simplest one available and comes with one bellows section and end connections. This type of expansion joint requires the most control of the adjacent piping in regards to anchors and guiding.

Universal expansion joint

This expansion joint has two bellows sections connected by a center pipe section. This design allows for large amounts of lateral deflection. The universal can also allow for axial and angular movements in addition to the lateral movement. This expansion joint does not come with the hardware to resist pressure thrust. Like the single unrestrained expansion joint the universal expansion joint must be properly anchored and supported.

Hinged expansion joint

This expansion joint has a single bellows section and is designed to allow angular rotation in one plane only. The hinge hardware is rigid in the axial direction so as not to allow the expansion joint to allow axial movement in piping systems. The hinged expansion joint is usually used in pairs of threes or in combination with a gimbal expansion joint.

In-line pressure balanced expansion joint

This expansion joint is unusual in its’ design in that it absorbs lateral, axial, and angular movement. This in-line pressure balanced expansion joint is designed for cases where the main anchoring is not feasible or pressure loads are to high for equipment like pumps and turbines.

Pressure balanced elbow expansion joint

This expansion joint is designed to not only restrain the pressure thrust but in addition, balances the pressure thrust so as not to have anchoring of the adjacent piping or equipment. This pressure balanced elbow expansion joint can be designed as single or universal depending on how much lateral movement is required.

Universal expansion joint

This expansion joint has a single bellows section. The gimbal expansion joint is designed to allow angular rotation in any plane by using two pairs of hinges connected to a common central floating ring. The gimbal expansion joint is usually used in pairs of threes or in combination with the hinged expansion joint.

Single tied expansion joint

This expansion joint is exactly like the single unrestrained expansion joint but it is provided with tie rods. When adding tie rods to the expansion joint it stops the bellows from overextending. The tie rods act as limit rods and has stops set to allow axial movement to a specifically designed movement.

Tied universal expansion joint

This expansion joint is exactly like the universal expansion joint but the tie rods have been designed into the unit. By adding the tie rods you restrain pressure thrust. The pressure balance expansion joint will not accept external axial movement without overcoming this pressure thrust force.

Accessories

Accessories are added to an expansion joint installation to meet specific customer, application or code requirements. Some are used to control movement, others to protect the bellows in the event of pressure thrust, and still others to defend against corrosion caused by media inside or from the environment outside the bellows.

Bellows
Angle Flange
Weld End
Liner (Baffle)
Cover
Particulate Barrier/Insulation
Liner Seal
Purge

Internal sleeves

Minimize the pressure drop through expansion joint.
Prevent vibration of bellows induced by high velocity, turbulent flow.
Prevent erosion of bellows in abrasive services.
Internally insulate bellows in high temperature services.

Anchor base

Divide piping into two separate segments insuring proper movement of each bellows in double type expansion joint.

External cover

Protect bellows against mechanical damage during installation and in service.
Protect personnel in hazardous services.
Serve as support for external insulation.

Purge aeration connections
Used in conjunction with internal sleeve to:

Prevent packing, “coking”, of flue-solids between internal sleeve and bellows.
Introduce coolant between bellows and internal sleeve in very high temperature service.

Tie rods

Prevent application of pressure thrust to piping, or equipment when expansion joint is used for lateral deflection and/or angular rotation only.
Used as limit rods on expansion joints for axial movement. Limit over-extension of joint and damage to piping or equipment if anchor fails.
Used as control rods to limit and control movement of universal type expansion joints.

Oversized bellows

Permit use of internal sleeve for joint moving laterally or angularly without reducing inside diameter.
Used in conjunction with internal sleeve to reduce bellows temperature in very high temperature service.

Liners

Internal liners can be used to either protect the metallic bellows from erosion or reduce turbulence across the bellows. They must be used when purge connectors are included in the design. In order to provide enough clearance in the liner design, appropriate lateral and angular movements must be specified by the designer. When designing an expansion joint with combination ends, flow direction must be specified as well.

Covers

External covers should be used to protect the internal bellows from being damaged. They also serve a purpose as insulation of the bellows. Covers can either be designed as removable or permanent accessories.

Particulate barriers/purge connectors

In systems that have a media with significant particulate content (i.e. flash or catalyst), a barrier of ceramic fiber can be utilized to prevent corrosion and restricted bellows flexibility resulting from the accumulation of the particulate. Purge connectors may also be utilized to perform this same function. Internal liners must also be included in the design if the expansion joint includes purge connectors or particulate barriers.

Limit rods

Limit rods may be used in an expansion joint design to limit the axial compression or expansion. They allow the expansion joint to move over a range according to where the nut stops are placed along the rods. Limit rods are used to prevent bellows over-extension while restraining the full pressure thrust of the system.

Applications

Pipe expansion joints are necessary in systems that convey high temperature commodities such as steam or exhaust gases, or to absorb movement and vibration. An expansion joint is a useful component in an infinite number of applications.

Expansion joints are also designed for other criteria, such as noise absorption, anti-vibration, earthquake movement, and building settlement.

Engineers and pipe designers routinely incorporate expansion joints into their pipe systems, as expansion joints add flexibility in to the design and reduce costs through removing the complexity of fix points, guides and reduces the overall space requirements for the pipe system.

Further, expansion joints are more effective than alternatives such as pipe bends and pipe loops due to their greater ability to conserve space, their economic efficiency and better performance in absorbing larger movements.
Where are expansion joints in use?

Where are expansion joints in use?

An expansion joint is a useful component in an infinite number of applications. Metal expansion joint assemblies are commonly used for all kinds of industries and applications including:

Power Generation
Co-Generation, Petrochemical
Chemical Processing
Pulp Paper Manufacturing
Cryogenic Process
Pressure Vessel and heat Exchanger
Heat Steam recovery Generator
Architect Engineering
Construction Engineering
Mechanical contractor
Pharmaceutical manufacturing
Gas Turbine, Gas Transmission
Diesel Engine Mfg, Incineration
Waste Water Treatment

Expansion joints are often installed near boilers, heat exchangers, pumps, turbines, condensers, engines and in long pipe systems or pipe ducts.

Expansion joints come in a wide variety of designs. Some of them are standard and some are customised as per client requirements.

Although their design may vary significantly, all expansion joints are nevertheless composed from some of the following components, all with one or more specific functionalities: bellows, welding ends, flanges, hinges, tie-rods, spherical washers, wire mesh, insulation, inner sleeve, external cover, elbow and/or ring reinforcement/equalizing rings.

In general, there are fabric, metallic, and rubber expansion joints.

Metallic Expansion Joints
- Single Expansion Joints
- Hinged Expansion Joints
- Gimbal Expansion Joints
- Universal Expansion Joints
- Elbow Pressure Balanced Expansion Joints
- In-line Pressure Balanced Expansion Joints
- Externally Pressurized Expansion Joints
- Toroidal Expansion Joints
- Thick Wall Expansion Joints
- Slip-type Expansion Joints
- Rectangular Metallic Expansion Joints
- Refractory Lined Expansion Joints
Fabric Expansion Joints
Rubber (Neoprene) Expansion Joints

Application of expansion bellows:

The Bellows are generally employed in a piping system in one of the following situations:

When the space constraints do not permit providing adequate flexibility by conventionalmethods (e. g. expansion loops etc.) for maintaining the system stresses withinacceptable limits.
When conventional solutions (e.g. expansion loops etc.) create unacceptable processconditions (e.g. excessive pressure drop).
When it is not practical to limit the piping induced loads on the terminal nozzles of theconnected equipment within admissible limits by conventional methods.
When the equipment such as Compressors, Turbines, Pumps etc. necessitate isolatingthe mechanical vibrations from being transmitted to the connected piping.

How do they work?

An expansion joint or movement joint is an assembly designed to safely absorb the heat-induced expansion and contraction of construction materials, to absorb vibration, to hold parts together, or to allow movement due to ground settlement or earthquakes.

They are commonly found between sections of buildings, bridges, sidewalks, railway tracks, piping systems, ships, and other structures.

Expansion joints – sometimes called expansion bellows, flexible joints or Expansion joint – are devices that comprise of a flexible element known as the bellows membrane that is fitted to end connections that are best suited to the pipework they are to be installed in.

Most bellows membranes are manufactured from stainless steel and are made up of a series of convolutions manufactured to withstand the pressure of the system but also must be suitable to accept the movements for which they are designed. The bellows membrane comprises of a series of convolutions designed to withstand the internal pressures of the system, but at the same time flexible enough to accept axial, lateral and angular deflections.

The joint needs to be a highly resistant nature so it’s necessary to make sure that it’s far thicker than you’d expect. In turn, this slows down any effects of potential corrosion as although it may be affected by the elements over time, it will still retain its density.

Ducted Air Systems

Expansion joints are required in large ducted air systems to allow fixed pieces of piping to be largely free of stress as thermal expansion occurs.

Bends in elbows also can accommodate this.

Expansion joints also isolate pieces of equipment such as fans from the rigid ductwork thereby reducing vibration to the ductwork as well as allowing the fan to “grow” as it comes up to the operating air system temperature without putting stress on the fan or the fixed portions of ductwork.

An expansion joint is designed to allow deflection in the axial(compression) or laterally (shear) or angular (bending) deflections. Expansion joints can be non-metallic or metallic (often called bellows type). Non-metallic can be a single ply of rubberized material or a composite made of multiple layers of heat and erosion resistant flexible material.

Typical layers are: outer cover to act a gas seal, a corrosion resistant material such as Teflon, a layer of fiberglass to act as an insulator and to add durability, several layers of insulation to ensure that the heat transfer from the flue gas is reduced to the required temperature and an inside layer.

A bellows is made up of a series of one or more convolutions of metal to allow the axial, lateral or angular deflection required.

What industries use expansion joints?

Expansion joints are used in all kinds of different sectors and in a huge range of different industrial contexts.

Expansion joints are particularly suited for aggressive chemicals and for abrasion resistance.
Sunny Steel Metal Expansion Joints can be custom-made from a range of carbon steels, austenitic stainless steels anc ceramic lined.
Stainless steel pipe expansion joint, with control rods

Specific industries that use expansion joints include the Energy sector such as nuclear power plants and district heating schemes.

Essentially, wherever there is a need to control pipework movement expansion joints are required. They are used in factories and power plants wherever thermal expansion needs to be controlled, such as pipelines that connect with condensers or power turbines. They are used in oil and fuel gas applications.

The Petrochemical industry on oil refineries, pumping stations and oil rigs.

Civil engineering, waste management, sewage treatment, recycling, water treatment, aerospace, aviation, defence, the automotive industry, agriculture, mining, metals manufacturing, food and dairy manufacturing and packaging, and so on.

Expansion joint application

Delivery

Inner package of bellow expansion joint

plastic bag + carton cases one pcs/box

Outer package of bellow expansion joint

Wooden cases

Inner plastic film packing, outer standard export wooden case packing.

Courier company transport, air freight and sea transport. It depends on your actual order details and quantity.

Ceramic lined pipe expansion joints

Size measurement of expansion joints

Packing ceramic lined pipe expansion joints

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FAQ

Q: How long is your delivery time?
A: The delivery time of customized products is generally 25 35 days, and non customized products are generally shipped within 24 hours after payment.

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A: If the value of the sample is low, we will provide it for free, but the freight needs to be paid by the customer. But for some high value samples, we need to charge a fee.

Q: What are your payment terms?
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Q: What is the packaging and transportation form?
A: Non steaming wooden box and iron frame packaging. Special packaging is available according to customer needs. The transportation is mainly by sea.

Q: What is your minimum order quantity?
A: There is no minimum order quantity requirement. Customized products are tailor made according to the drawings provided by the customer.