Metal Expansion Joints

AD Muller2020-09-20T23:54:48+00:00

Metal Bellows Expansion Joints

To begin, metal expansion joints are also referred to as metal bellow expansion joints, metallic expansion joints, exhaust bellows, and metal bellows. Furthermore, metal bellow expansion joints are helpful for thermal expansion and movement in pipelines. Additionally, they consist of different parts.

Firstly, the main part of the metal expansion joint is the metal bellow. Furthermore, the bellow also is the body of the joint. Additionally, bellows can be made out of different metals. Next is a connector at both ends, this is usually a flange. Then is a tie rod. Moreover, choosing if a tie rod is needed, depends on the application. Also piping metal expansion joints are chosen according to the three basic types of movement: axial, angular and lateral. They also have usage in various sectors, like energy productions, paper industry, chemical industry, water treatment, oil and gas.

Metallic Expansion Joints

In short, a metallic expansion joint by itself accommodates axial, longitudinal and angular movements in a pipelines, ducts and vessels. The addition of accessories to a metal expansion joint increases the complexity but also it’s capabilities. In addition, the accessories for the expansion joints include, liners, weld ends, flanges, collars, hollow reinforcing rings, solid root rings, equalizing rings, control rods, limit rods, and tie rods.

In brief, when you can’t use a rubber or fabric expansion joint, there are several types of metal expansion joints you could use. However, each type of expansion joint is designed to operate under a specific set of design conditions. Furthermore, some of the most common types of expansion joints are round and rectangle expansion joints, single expansion joints, formed metal bellows, laminated bellows expansion joints, expansion compensators, universal expansion joints, externally pressurized expansion joints, and bellows pump connectors.

Single Metal Expansion Joints

In this paragraph, I’m going to tell you about single metal expansion joints. For instance they have one bellow. In addition to, axial compression and extension, the lateral and angular movement can be accommodated. Therefore, they do not restrain the internal pressure thrust. However, the piping designer must provide the system with separate anchoring and guiding to resist the pressure thrust. Furthermore, where small thermal movements are involved and proper anchoring and guiding is feasible, a single metal expansion joint is the most economical installation.

Universal Metal Bellows

For the most part universal metal bellows consist of two metal bellows separated by a pipe spool. Usually this configuration helps with large lateral movements. In addition to axial compression and extension and angular deflection. Also metal expansion joints have no restraints to resist pressure thrust. Therefore, the piping designer must provide separate anchoring to handle pressure thrust.

Exhaust Bellows

Exhaust bellows are also known as exhaust expansion joints or corrugated flexible pipe and are around heat. Therefore, metal exhaust bellows are usually designed for high temperature.

Finally while choosing a metal expansion joint customer must know the following. Firstly all the size of the joint. Secondly pressure at which the system operates. Next is the temperature at which the system operates. Last of all, the possible direction of deflection.




Vibrasnubs & Flexible Strut Joints

AD Muller2020-09-10T23:00:21+00:00


Vibrasnubs & Flexible Strut Joint

In this paragraph, I’m going to tell you about vibrasnubs and flexible strut joints. Firstly vibrasnubs and flexible strut joints are used to support structures and system components. Secondly they restrain unwanted structural movement. Also they accommodate high tensile and compressive load. Next vibrasnubs and flexible strut joints absorb dynamic vibration and shock loads. Lastly a vibrasnub and a flexible strut joint can handle compound motion due to torque and rotation.

Moreover, when used together, the “Ball Type” Flexible Strut Joints provide a rigid structural support. Thus able to resist high tensile and compressive loads. And it allows lateral, angular, and rotation movement. Also, the precision ball and socket construction provides a maintenance free rigid connection to brace process equipment. For instance piping, pressure vessels, boilers, and tanks.

Furthermore, strut joints combined with vibrasnub hydraulic vibration snubbers form an assembly that absorbs tensile and compressive shock and vibration loads while allowing gradual movements such a thermal growth.

Dannenbaum LLC “Ball Type” vibrasnubs and flexible strut joints provide the direct method to support structures and system components. Also restrain unwanted structural movements. As well as accommodate high tensile and compressive loads. Furthermore absorb dynamic vibration and shock loads. The vibrasnub has a ball joint attached to the end of it.

Handle compound motion due to torque and rotation.

Dannenbaum LLC Strut Joints and Vibrasnubs

Dannenbaum LLC “Ball Type” Flexible Strut Joints.

Double: Acting handles both tensile and compressive loads. Accommodates push, pull and slide movement with

positive control.

Precision: Built-Factory machined to  close  tolerances and rigidly inspected. Reduces the possibility of danger­ous errors in field construction.

Lower Cost-Lower: Initial cost compared to other motion control and restraint methods, and economical operation.

Maintenance: Free-Permanently lubricated. No adjusting or service required.

Simple: Simplifies structural designing and eliminates the need for special struts, tie-rods, or clevis-and-pin arrange­ments. They are not as flexible, and are subject low stress and binding.

Safety: High load carrying capacity for reliable service in severe conditions. Moreover combined with easy calculation of prop­er sizes to promote safety in structural design.

Dannenbaum LLC “Ball Type” Flexible Strut Joints may be applied for static or dynamic loads. They are equally rated for tensile or compressive loads. The most common uses are:

  1. Structural sway bracing for hot stacks and pipes.
  2. Supports or hangers for horizontal piping.
  3. Stability supports for tall or slender towers, structures or vessels.
  4. Restraints to direct and control thermal expansion away from components that should not be stressed. For instance turbine nozzles and pump flanges.

“Ball Type” Flexible Strut Joints are simpler, cheaper, and less bulky then other restraints. For instance slide plate guides, A-frames, and clevis-and-pin arrangements.

Vibrasnub Hydraulic Vibration Snubbers

The vibrasnub snubber is designed to be used to control dynamic vibration on and shock loads. For continuously applied static loads, use flexible strut joints. Moreover, vibrasnub hydraulic vibration snubbers function as a stop or restraint for dynamic vibration and shock loads. Therefore, these rapid movements may (or may not) be accompanied by slower natural movements, like thermal expansion or contraction. Rapid vibration movements are absorbed by the snubber assembly. Passing hydraulic fluid through a restricted orifice in the piston of the snubber cylinder makes more gradual thermal movement. The “Ball Type” Flexible Strut Joints on each end of the assembly permit a +/-10° alignment movement to eliminate binding. Increased angulation available some sizes.

Advantages of vibrasnub hydraulic vibration snubbers:

Lower cost — Simplicity and long life, with minimal maintenance compared to other types of vibration and shock control mechanisms.

Reliable, long service life — Proven superior through years of testing and installed use.

Fast, positive action — Resist and dampen shock and vibration loads instantaneously.

Eliminates binding — Permit +/-10° angular and conical movement of supported structure while dampening vibrations and shock loads.

Handles slower, thermal and seismic movements.

Only a nominal pressure drop created across the bypass orifice against slower thermal movements.

Simplifies design and installation — Compared to other more complicated motion control systems.

Vibrasnub Installation

In this paragraph, I’m going to tell you how to install vibrasnub snubbers. Firstly you can install the vibrasnub in any position. Secondly, use them in pairs with an acute (less than 90°) interior angle. Also if only one snubber is installed, it must be installed directly in line with the thrust force. Guide the moving member to eliminate any possible lateral movement.

Weld the Strut Joints at the end of each vibrasnub assembly to pipe or steel structure. The anchor points should be designed to withstand the total loading, and minimize secondary vibrations.

Isolate the vibrasnub cylinder from heat (or hot member of structure). Furthermore, the pipe extension should be towards the heat source to prevent cylinder temperature from exceeding +150°F (•66°C).

Available Option.

Neoprene boot to protect exposed piston rod area against damage from dust, weather and corrosive atmosphere.

Ball Joints

AD Muller2020-08-24T18:45:03+00:00

Ball Joint

We can help you with your Ball Joint selection. With a unique design, the Ball Joints can be disassembled for seal replacement, inspection, or other maintenance issues with a resulting product that lasts a lifetime. Futhermore, they absorb pipe movement for applications ranging from steam and hot water pipe expansion, tank and building settlement, seismic isolation, wave motion compensation on oil platforms and drill ships, solar panel movement, oil well riser expansion and safety relief valve escape piping.

Ball Joints are commonly used in steam hot water heating systems due to their safety and reliability. When used in sets of two or three they absorb thermal expansion or contraction by the Off-Set method of lateral displacement. They are installed in pipe run or loop oriented perpendicular to the movement. Main anchors are not required as the design of ball joints reacts pressure thrust, and the flex torque reaction force is moderate.


To react pressure thrust and absorb rotational and torsional motions, ball joint are used for tank and building settlement, seismic isolation, solar arrays, and piping displacement from wave motion. Also ball joints are approved by Factory Mutual System for fire protection systems, and have been tested to 8.3 seismic simulation.

Three ball joint installation

Two ball joint installation.

Ball Joints

Ball joints are used extensively for shipboard applications including oil platforms and drill ships. They are designed and qualified to ASME Class 2500 through 8″ NPS, and Class 900 through 12″ NPS. Fire tested to API 6FA, they meet ASTM F1298 shipboard piping specifications. Also they are approved by ABS Americas and Lloyd’s register.

Type N Style I Ball Joints

have evolved from the original ball joints, developed by Barco in 1908 to distribute steam from locomotives to passenger cars for heating. The Type N Style I was developed in 1960. Since that time thousands of Style I joints have been installed in steam, hot water and chilled water distribution systems, used to absorb tank and building settling, used for seismic isolation and many other piping applications to compensate for expansion or to add flexibility to the system. Type N Style I joints are available from 2 1/2″ through 30″ with proprietary Compound 11 composition seals or Compound 24 glass filled Teflon seals.

Type N Style II, III & III-V Ball Joints

They designed with injected graphite flakes with synthetic oil carrier, Grafoil® Flexible Graphite, that provides lubrication in addition to sealing. Grafoil® combined with a variety of high strength bearing materials results in increased temperature and pressure ratings. Seal options include Compound 11 non-metallic composition material, Number 21 ductile iron, Number 39 Alloy 625 high nickel stainless steel and Number 45 chrome-moly steel.

All Type N Style II, III & III-V ball Joints

They permit repacking with Grafoil® after installation. Packing of Type N Style II ball joints is accomplished with the system pressure removed and the installation of a Recharge Cylinder. The Recharge Cylinders are a permanent part of Type N Style III & III-V thus permitting repacking with the system operating. The Style III-V has the added benefit of a Safety Valve to completely isolate the system pressure.

Dannenbaum LLC. can also help you with your Standard series Ball joint, OW1500 Ball Joints , and Series 3500 IS In-Line Seismic Expansion Joint.


Rubber Expansion Joint Models

AD Muller2020-05-14T08:44:25+00:00

Rubber Expansion Joint Models. We have a line of different Rubber Expansion Joint Models. Please take a look and send us an RFQ and we can supply what is needed.

Temporary Strainers

AD Muller2020-09-23T17:08:30+00:00

Temporary Strainer

To start with temporary strainers are generally used at startup of pipelines to filter larger debris and foreign objects that may be present during construction and startup. Furthermore, temporary strainers may be conical or truncated. Hence, flow and media determines the direction of the strainer. In addition piping systems usually need industrial strainers.

In brief, temporary strainers are mostly used for start-up of new or revamped piping systems. Therefore, temporary strainers will prevent construction debris from causing damage to downstream equipment. Also the screen cone is welded around the entire circumference of the flange ring. Thus provides strength and prevents unwanted bypass.

Size: Range in sizes from 1/4” to 60” nominal pipe size as standard.
Open Area: Range in open area of strainer to cross section area of the pipe from 100% to 300% as standard.
Material Thickness: Gauge of strainer material ranges between 22 to 11 depending on hole size.

Basket type strainers protect equipment by removing solids from liquids and other piping systems with the use of a perforated or wire mesh straining screen in a vertically oriented chamber.

Perforation: Perforation hole sizes range from 1/16” to 1/4” as standard.
Type of Material: Materials include carbon steel, various grades of stainless steel and alloys.
Flange/Facings: Temporary strainer support rings can be made to work with standard flanges. For example raised face flanges, and ring type joint flanges.
Welding: Resistance welding, TIG and Oxyacetylene.
Liners/Covers: Available for small particle removal 200 through 10 mesh carbon steel; stainless steel, etc.
Straight Flow – Mesh on inside.
Reverse Flow – Mesh on outside.

Cone type strainers can be temporary and put in pipelines to protect equipment from debris and particles.

Ordering Information.

Example: Include full description.

Temporary Strainer Size

Temporary Strainer Size




4” Temporary Cone Strainer, Stainless Steel, ASME Class 150, 150% Open Area and 1/8” Perf. Screen.

In general, when ordering specify:

  • First and foremost pipe size.
  • Then pressure rating/flange rating.
  • Next perforation or mesh size.
  • Also material.
  • As well as style – Cone, Basket, etc.
  • In addition to the direction of flow – straight or reverse.
  • Lastly the percentage of open area or length.
Plate type strainers involve a flat plane of mesh that stretches perpendicular to the system's flow.

Conical Strainers

To begin with conical strainers are in the shape as a cone. Hence why they are called a cone strainer. A conical temporary strainer is a perforated devices of perforated or woven mesh to catch particles in a pipeline. Furthermore, Dannenbaum LLC can help with temporary conical strainers.

However, these are usually temporary and put in pipelines to protect equipment from debris and particles. Also conical temporary strainers are shaped like a cone, or witch’s hat.

Moreover, a conical temporary strainer can catch particles down to .001 inch in diameter. In addition cone strainers have little pressure drop, and can be removed after startup, and the debris is evacuated.

And the sizing of Conical strainers is important to ensure the strainer screen can block particles that could damage equipment.




Process Industry
Water and Wastewater
Power Industry
Pulp and Paper
Chemical Industry
Oil and Gas
Steel Mills
Metals and Mining
Download Detailed PDF

Cone, basket & plate strainers
100% to 300% open area range (OAR) as standard
Custom engineered designs available

Stainless Steel
Carbon Steel
Other Alloys upon request

Wafer Flat Faced
Raised Face
RTJ Flanged

3/4″ (20mm) up to 24″ (600mm) as standard
Larger sizes available upon request

Bleed Rings & Drip Rings

AD Muller2020-09-11T16:29:16+00:00

Bleed Rings

In this paragraph I am going to tell you about bleed rings & drip rings. Firstly they have many names. For example, bleed rings & drip rings are also known as a bleeder ring, flushing ring, vent ring or a test insert. Furthermore, a bleed ring is in a shape of a ring designed to fit between pipe. Along with standard flanges, using most material. The bleed ring (Drip ring, bleeder ring, flushing ring, vent ring, Test Insert) can come in any material or size, and is designed for connecting valves and instruments. The face of the Drip ring can be manufactured to match with any flange type. The standard sizes for a bleed ring are 1″ to 24″ and, ANSI ratings from 150# through 1500#.

Drip Rings

Dannenbaum LLC can supply any size or material for the bleed rings. Standard material is carbon steel. Bleed Rings can provide a beneficial way of draining piping, taking samples, attaching instruments or even bleeding of a valve. They can also be used with a valve and/or blind flange. Therefore, this allows you to reduce and dispose of the pressure for your valve before you remove the flange. This is usually done with a replacement for a leaky valve. Contact Dannenbaum LLC for more information.

Areas Served:

We are one of the leading suppliers of bleed & drip rings in the following cities in Texas:


Houston, Dallas, San Antonio, Austin, and throughout Texas

Dimension (Inches)

Bleed rings size chart

Suction Diffusers

AD Muller2020-09-11T16:27:09+00:00




Suction Diffuser

There are many different industries use suction diffusers. For example, the process industry, metals and mining, power industry, water and waste, chemical industry, pulp and paper, oil and gas industries all use suction diffusers. Also suction diffusers are installed on the inlet of a pump to help a smooth in-let flow. Additionally they remove objects from damaging the pump. Moreover, suction diffusers provide ideal flow conditions for the pump. Thus suctions diffusers reduce the amount of pipe that would be needed to achieve a steady flow. Dannenbaum LLC can provide a commercial and industrial suction diffuser.

Pump Suction Diffuser

Additionally pump suction diffusers shall be attached to the side of the pump, as well as made to code. In addition, the pump suction diffuser has a strainer to stop unwanted material from entering the pump. Furthermore, pump suction diffusers give the right state of flow conditions to the pipe. Also extra features for a suction diffuser include a throwaway stainless steel start-up screen. The piping system uses this screen for the capture and removal of unwanted items. Also we supply a movable support for mounting.

Strainers and Suction diffusers are similar. Suction diffusers are a type of strainer. Additionally, in smaller areas that are harder to access, the pump suction diffuser is attached to the pumping-equipment inlets. Thus saving space and lowering cost. They eliminate the need for an equivalent length of up to ten pipe diameters of straight run on the suction side of the pump.

The Strainer Suction Diffuser mount directly to the suction side of the pump in either a horizontal or vertical position. Also they can be manufactured in accordance with ASME B31.1, ASME B31.3 and/or ASME Section VIII, Div. I and are available with Raised Face, Flat Face or Buttwelded connections.

Particles and debris from the flow can be removed by both suction diffusers and strainers. They both can have screens that reduce risk of damage to equipment such as pumps, and compressors. Different types of strainers are fabricated duplex strainer, Y strainers, temporary strainers, T strainers, and basket strainers. When you don’t use a suction diffuser for a pump, sometimes you will use a bellow pump connector or braided flexible metal connector.

A commercial suction diffuser and an industrial suction diffuser can be made as a casting, or can be custom fabricated.

What is the suction diffuser’s purpose?

Suction diffusers are a combination elbow, reducer, and strainer. Therefore, this combination reduces labor and costs. By looking at it you can see that it is an elbow and a reducer. The suction side should match the pump size. Moreover, the inlet side can be the same or a larger size. Furthermore, the suction diffuser diffuses the water into the pump. It is a flow straightening device that provides the most flow efficiency at the suction inlet of the pump.

Fabricated Suction Diffusers

Firstly, fabricated suction diffusers can take pressures up to 740 psig, and temperatures up to 800 degrees Fahrenheit. Furthermore, we supply standard and custom designs. As well as make our fabricated suction diffuser with any inlet size connection. Additionally we supply one, three, or five diameters of flow straightening. Also our industrial suction diffusers comes with pads for mounting, and a drain connection with plug. Data packages and MTR available. We can supply any material needed for an industrial suction diffuser, or a commercial suction diffuser. Mostly used is carbon steel or stainless steel. Feel free to contact us for any questions.





Suction Diffusers

Process Industry
Metals and Mining
Power Industry
Water and Waste
Chemical Industry
Pulp and Paper
Oil and Gas
Download Detailed PDF
Filtration Down to 40 Microns
Large Diffuser Screens
Long and Short Neck Versions Available
Fabricated Construction
Carbon Steel
Stainless Steel
Other Materials Upon Request
Flat Faced
Raised Face
ASME Class 150

Fabricated – Custom sized to meet requirements

Areas Served:

We are one of the leading suppliers of suction diffusers in the following cities in Texas:


Houston, Dallas, San Antonio, Austin, and throughout Texas

Cold Shoes (Cryogenic Pipe Supports)

AD Muller2020-08-24T19:38:49+00:00
Cold shoe

Cryogenic Pipe Supports

Dannenbaum LLC are suppliers of Cryogenic Pipe Supports in three main categories:

1) High Density Polyurethane Foam (HD PUF) 2) Glass Reinforced Polyester Composite 3) Hardwood. Densified Wood Blocks The selection of one of the above forms of Pipe Support is dependent on many factors, which include: load carrying capacity, ease of installation, piping contractors requirements etc. This section includes typical details of all three types of Cryogenic Supports, however due to the numerous individual requirements in the marketplace, we welcome all enquiries in connection with the supporting of Cryogenic piping and our experienced engineers can offer guidance as to the benefits of all three systems.

Dannenbaum LLC are suppliers of Cold Insulated Pipe Supports consisting of a steel cradle containing High Density Polyurethane Foam inserts “Thermafoam” is specifically formulated and molded in single or multi layer 180° segments with high density skins. The design make-up of the insulated pipe support can be categorized as follows. HD PUF monolithically molded, or cut from bun stock, segments either single or multilayer. ii) Aluminum foil vapor barrier to prevent ingress of moisture. iii) Aluminized metal thin gauge protective jacket, to prevent damage to the vapor barrier. iv) Mechanically strong carbon steel support cradle which contains the insulation element and allows pipe loading to be transferred safely to supporting structures. (see page 146 for typical details) The two essential design parameters for Cryogenic Pipe Supports are compressive strength and thermal conductivity, Polyurethane Foam has superior insulation properties to prevent heat loss and maintain temperatures in cold process pipelines to prevent freezing. Polyurethane Foams can be efficient over an extremely wide range of temperatures typically -196ºC to +120ºC. The density of the foam which determines the compressive strength is generally between 160 kg/m3 and 320 kg/m3 and with these load bearing properties it is evident why PUF is such a suitable insulation material for Cryogenic Support Applications. Polyurethane Foam is produced by mixing two liquids along with a blowing agent and Carpenter & Paterson using the latest in molding machine technology utilize CFC free blowing agents in producing monolithically molded components with a very low isocyanate index. Steps are machined to ensure alignment with the parent pipe insulation system. With the manufacture of the steelwork and the PUF insulation undertaken side by side in our works, we ensure complete control of production progress throughout.

Our Engineering Department is staffed by experienced designers who are able to give practical advice and assistance in the design of Cryogenic Pipe Supports. Our Engineers upon receipt of all relevant information can calculate and design the cryogenic supports needed for each project from simple shoes to complex anchors. Fully dimensioned detail drawings for each individual support are produced for customer approval before manufacture commences. The molding tools are designed on a project specific basis and they can be produced in pipe sizes ranging up to 900NB and above with insulation thickness of up to 250mm. Independent testing is carried out to determine the thermal conductivity, the density and compressive strength of the HD PUF materials. Our testing, calculation and design criteria are all based on: i) Shell DEP No – Gen document ii) ASTM D-1621: Compressive strengths of HD PUF iii) ASTM C-177: Thermal conductivity testing Our Quality Systems are regularly audited by third parties and have been fully endorsed by achieving certification in accordance with BS EN ISO 9001.

Alignment Guides

AD Muller2020-09-19T19:02:36+00:00


Alignment Guides

In this paragraph, I am going to explain about alignment guides. Firstly they are designed to be installed next to expansion joints. Secondly they are made of steel pipe and copper tube that runs to maintain the center-line of the pipe/tube. Next alignment guides expansion joints are large-structure. Furthermore low-mass technology resulting in minimum weight while providing 3-Dimensional alignment using the conservative Spider & Cylinder arrangement.

Moreover, pipe or copper tube systems that incorporate expansion joints, ball joints, or loops to absorb expansion must include three additional major elements. Main and/or intermediate anchors, supports, and alignment guides.

Requirements follow the Standards of the EJMA, Inc. Do not include internal guides require an alignment guide to be located 4 diameters from the face of the expansion joint. Expansion joints additional guide 14 diameters from the first guide. Expansion joints with internal guides require only one alignment guide to be located 10-14 diameters from the expansion joint.

The maximum alignment guide spacing in the intermediate portion of the run is a function of the pipe/tube properties (modulus of elasticity and moment of inertia) the design pressure, and the expansion joint effective area and spring force.


Steel Pipe Guides

Alignment Guides manufactures and inventories standard for nominal pipe size (NPS) steel pipe from 3/4” through 14” with varying insulation thickness. Hot dipped galvanizing or all stainless steel construction are also available. In tight spaces, rotated housings are available. The maximum operating temperature is 500°F. All stainless steel construction is also available to provide greater corrosion resistance, higher temperatures, or cryogenic systems.


Copper Tube Guides

Alignment Guides manufactures and inventories standard for standard size copper tube from 3/4” through 4” with varying insulation thickness. Hot dipped galvanizing is available as an option. In tight spaces, rotated housings are available. The maximum operating temperature is 400°F. All stainless steel construction is also available to provide greater corrosion resistance.


Product Selection (Part Number) & Ordering Instructions:
  1. Choose Steel Pipe or Copper Tube, then locate correct Table.
  2. Select the size.
  3. Select insulation clearance: a maximum value equal to or greater than the insulation thickness to be installed.
  4. Verify the Alignment Guide Expansion/Travel stated is equal or greater than the motion occurring at the guide location. For additional expansion increase the last part number indicator as needed.
  5. For Hot dipped galvanized steel or stainless steel materials, select one of these options below in the example.
  6. Confirm the guide housing “A” spacing will fit into the system. If it does not, select the “-45” degree housing and spider option and re-verify the spacing.



Expansion Compensators

AD Muller2020-08-27T13:43:45+00:00

Expansion Compensator

In this paragraph, I am going to explain about expansion compensators. Firstly they are designed for installations where the principal movement is axial. Secondly standard designs are 3/4” through 4” for steel pipe and copper tube with 2” or 3”axial compression. Next copper tube ends are male or female sweat connections. The pipe or tube, telescopes into the compensator providing a smooth full bore. Therefore, it isolates the bellows from the flow.


  • Sizes 3/4” through 4.”
  • Threaded, welded, flanged, and grooved steel pipe joints.
  • Male and female copper sweat ends.
  • Design pressure: 200 psig—see Copper Tube.
  • Axial travel: 2” and 3.”
  • Fully enclosed and externally pressurized, multiply stainless steel bellows.
  • Internal guides maintain alignment.

Expansion compensators provide a maintenance-free, compact, economical, and reliable method of eliminating this problem. Moreover the compact design of Expansion Compensators permits installation within tight spaces. And the inline construction minimizes pressure drop and heat loss. And the metal bellows is fully enclosed, and internal and external guides maintain alignment. Moreover, all welded or high-temperature brazed construction eliminates the need for maintenance.


Expansion Compensators are designed for installations where the principal movement is axial. Also standard joints are designed for 2” or 3” axial compression (pipe expansion) and 0.5” extension. If the primary movement is extension (pipe contraction), the expansion compensator can be preset at the factory. The piping system must include anchors to react the force produced by pressure thrust and the bellows.

Installation Instructions

In this paragraph, I am going to tell you about installation. Firstly, Expansion Compensators are available for 2″ and 3″ axial travel. Secondly check the specification for the allowable travel of the product. But be certain that the system conditions and test conditions do not exceed these values. Guides, supports, anchors: Expansion Compensators are designed for applications where the principal movement is axial to the centerline of the compensator, and the system includes guides, supports, and anchors. Finally the flow can be in either direction. But not exceed 1000°F during installation.