Telford foundry

BLUTOP joint


BLUTOP joint

Joint performance determines the reliability of the pipelines during the following operations:
– Jointing
– Pressurizing
– During
– The product’s life cycle,
– All conditions of use

blutop joint

PAM has combined all its design skill and know-how, together with that of the very finest gasket manufacturers, in order to create the BLUTOP joint.

One of BLUTOP’s major advantages is the pipeline anchoring system, which eliminates the need for heavy concrete thrust blocks.
The technology developed and patented by PAM has greatly enhanced the competitiveness of its anchoring systems.

Channelling the jointing force

The BLUTOP joint has been specially designed in order to guarantee:

  • Easy laying with a lower force requirement to allow for jointing using a crowbar
  • Safe laying thanks to a mechanism to prevent the gasket from becoming loose during assembly
  • Support points along the fittings make for easy jointing along the correct axis plane

This unique design, which has been perfected in close collaboration with several installers, allows for faster laying without causing additional tiredness and fatigue.

High performance levels

The full use of PAM technologies has made it possible to create high performance BLUTOP joints.





75 to 160C25253035


Angular deflection

DN/ODTolerated deviation during installation (°)Shiftling (cm)
75 to 16062


The BLUTOP joint withstands an angular deflection of 6°.

Study of the full range of pressure options

During their useful lifetime, water distribution pipelines are subjected to numerous types of pressure. This naturally includes standard service pressure, but also the following:
- Day / night time pressure cycles
- Water hammer
- Pressure drops
- External pressure from the earth, groundwater
- Period without pressure prior to commencement of operations

In each of these situations, the joints are subjected to specific types of stress. For this reason, all joints for ductile iron pipelines are designed and tested in accordance with strict methods:
- In accordance with EN 545 testing: 4 tests
- PAM’s own specific testing consisting of 4 additional tests

In addition, PAM carefully studies all its new joints using scientific finite element calculus methods similar to those used in the aeronautical and car industries.
These design methods and tests guarantee unbeatable durability and reliability.


Positive internal pressureMaximum deviation
Shear force
30 DN
1.2 PFA+5barTo prove the joint’s
capacity to withstand the
hydraulic pressure
EN 545
Negative internal pressureMaximum deviation
Shear force
30 DN
-0.9 barTo prove that the joint is
EN 545
Cyclic internal pressureShear force
30 DN
24000 cycles
To prove the joint’s fatigue
EN 545
Positive external pressureMaximum deviation
Shear force
30 DN
2 barTo prove that the joint is
resistant to groundwater
EN 545
Positive internal pressureMaximum deviation
Shear force
30 DN
Set up using seal bush
at 1.5 PFA+5 bar
To prove joint performance
at all pressure levels
AgeingWater at 80°C3 months of cycles
To prove the joint’s ageing
performance PAM
Fine sand infestationFine sand heavily
compacted around the joint
prior to pressurizing
First three
EN 545 tests
To prove the resistance to
sand entering the joint
Silt infestationCompaction of silt around
the joint prior to
First three
EN 545 tests
To prove the resistance to
mud and silt under the



Technical Enquiries:
+44 (0)115 930 0700
Customer Services:
+44 (0)115 930 5000


How to assemble a Blutop pipe
The ductile cast iron pipes and fittings of the BLUTOP® range are available with diameters between 75 and 160 mm. The BLUTOP® range is ideal for drinking water distribution networks in urban, semi-urban and rural areas. It has been designed to facilitate the extension or renewal of existing networks.
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Logo de la gamme Blutop

See also

Range of Rigid Flanged Joints
A combination of innovations specific to water distribution.
BLUTOP Vi joint is the anchored version of BLUTOP joint.