Hinged / Angular Metal Expansion Joint

                  In Pipeline systems, such as the ones in Pharmaceutical, Chemical, Power, Glass, Petrochemicals, Oil and Gas, and Steel Industries, expansion and contraction of metal takes place, with variations in temperature. With this expansion and contraction of metal, there is variations in movement of the individual sections of the pipes.
                  If the movement cannot be absorbed by the piping system, then metal expansion joints are used to compensate the movements that occur. Apart from the thermal movement, other applications such as vibrations and noise in pumps, compensator, turbines, motors and vessels is also compensated by using metal expansion joints.
                  Depending upon the nature of movement that needs to be compensated ( axial, lateral or angular ), expansion joints are designed. Ocelflex’s Metal Expansion Joints are designed to absorb the movement, as well as withstand other operating conditions such as ,i>temperature, pressure and the inner media. Our design is in accordance with international standards such as E.J.M.A. and A.S.M.E..
Hinged Metal Expansion Joint / Expansion Bellow
                  Hinged metal expansion joint is capable of greater angular movement, and with some designs, it can absorb axial movement. The angular movement is provided by use of metal hinges.

                  So, if two such metal expansion joints are used in unison, separated by a segment of piping, the arrangement can provide greater lateral movement, similar to a Universal Metallic Expansion Joint, in a single plane application. Hinged expansion joints are usually used in sets of two or three, to absorb lateral deflection in one or more directions in a single plane piping system.

                  For a pair of hinged expansion joint, placed in unison, separated by a segment of piping, the lateral movement is directly proportional to the distance between their hinge pins and the angular rotation that the expansion joint is capable of.

                  Optional Stainless Steel Covers or Inner Sleeve ( Inner Liners ) are available on request. An inner sleeve is generally used to protect against the turbulent flow of the inner media or if it is corrosive in nature such that it may damage the thin walled stainless steel expansion bellow.

  • ⇨ Bellow Inner Diameter : DN 40 to DN 5000 ( 40 NB to 5000 NB, 40 mm to 5 mtrs)
  • ⇨ Bellow Length : 4" to 18" Long ( 100 mm to 450 mm ). Also available as per your specification
  • ⇨ Design Standard : Bellow : E.J.M.A. 9, A.S.M.E., End Fittings : Custom Made or Standardized
  • ⇨ Pressure & Temperature : Temperature : upto 700 C, Pressure : upto 30 Kg/cm2
  • ⇨ Additional Accessories : Lugs and Tied Rods, Inner Sleeve, External Protective Cover
  • ⇨ Bellow Material : Stainless Steel 300 Class ( AISI 304, AISI 316, AISI 321, AISI 316L, AISI 304L), Inconel.
  • ⇨ Inspection Documentation : Leakage Test Reports, Specification Inspection Report, Material Test Report.
Material & Standard
Fill Specification Sheet
Technical Details
Setting up Multiple Hinged Expansion Joints In a Pipeline System

                  In case of end fittings, either the flange end or weldable / pipe end can be used.

                  In case of a system containing two regular hinged metal
expansion joint, connected by a centre piece, the thermal
expansion of the offset part in between the two expansion
joint, must be absorbed by bending of the piping legs which
are perpendicular to that segment, since the metal expansion
joints are capable of only angular rotations and not axial
compression or expansion.

                  The placement of the hinges of the expansion joints need not be
collinear in such a system, instead it should be arranged as per
the movement required.

                  In order to provide small amounts of axial movement, slotted hinges
are used.
Ocelflex manufactures both slotted and the regular hinged expansion
Types of Metal Expansion Joints / Expansion Bellows

                   Depending upon the nature of movement, and upon the piping system where the expansion joint has to be installed, there are different types of Metal Expansion Joints. Review the metal expansion joints below to choose the optimal design for your applications. Click on any to understand how the expansion joint works :

Understanding Expansion Joints Terminology & Definitions
                   Many parameters are to be considered to design an expansion joint. To understand these and other expansion joint terminology, refer the below links.
                   Depending upon your application and requirement, you can fill out the metal expansion joint specification sheet for us to understand your enquiry, and based on our experience we shall quote the most suitable metal expansion joint for your application, at the most competitive rates. In case you already have a sample, and would like us to manufacture a similar product, then you can send us the photographs, dimensions and/or drawings.

  • Expansion Bellows, Expansion Joints, Pressure & Temperature Parameters
  • Inner Sleeve, Multi Ply, No. of Convolutions, Material of Construction
  • Axial, Lateral and Angular Movement
  • Pipe Guides and Anchoring, End Fittings / Connections & Standards
  • E.J.M.A. standard and other designs