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JP118 Axial Expansion Joint Weld End

Now Available With Precision Fit Flexible Lagging Jackets To Suit JP118.


Axial expansion joint consisting of stainless steel grade 321 bellows assembly fitted with carbon steel weld pipe ends.


Stourflex axial expansion joints are designed to accommodate pipe movements in an axial plane ( straight runs ) due to thermal expansion. They are suitable for use on L.T.H.W.,M.T.H.W.,H.T.H.W., steam and other hot liquids and gases.

  • Maximum working temperature 300ºC.
  • Maximum working pressure 16 bar at 120ºC.
  • Stourflex axial expansion joints should not be used at both their maximum working temperature and pressure respectively.
  • Maximum test pressure = 1.5 x working pressure or 1.5 x end connection rating, whichever the lower.


Stourflex are now able to offer a tailor made flexible lagging jacket to help reduce heat losses on LTHW systems and heat gains & condensation on CHW systems. Please ask for pricing or more information.

Download data sheet
JP118 expansion joint

our technical specifications

Our JP118 Axial Expansion Joint Weld End specifications

Part numberN.B. (mm)Total movement (-mm)Overall length (mm)Force to compress (N/mm)Effective area (Cm²)Working pressure @120°C (bar)Cold test pressure (bar)
JP118-2525+10 -2021050161624
JP118-3232+10 -2021550181624
JP118-4040+10 -2022060231624
JP118-5050+10 -20210104371624
JP118-6565+20 -4029544581624
JP118-8080+20 -4029089791624
JP118-100100+20 -403001261281624
JP118-125125+20 -403101601831624
JP118-150150+20 -403252172681624
JP118-200200+20 -403453474371624
JP118-250250+20 -403352957051624
JP118-300300+20 -403352489841624

Stainless steel grade 321 internal flow sleeve fitted as standard. External protective sleeve available on request.

Where service conditions above 300ºC or 16bar exist or where additional movement is required non standard variations of the Type JP118 are available if required.

Stourflex axial expansion joints are supplied at their neutral length shown above and may be extended on installation (cold draw) to achieve total movement. Do not exceed total movement.

Axial expansion joints must be securely anchored and adequately guided to ensure their correct performance. Omitting anchors and guides may result in failure of the system.

All Stourflex products should be installed in accordance with our fitting instructions.

Download data sheet