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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 pressure

Maximum deviation
Shear force
30 DN

1.2 PFA+5bar

To prove the joint’s
capacity to withstand the
hydraulic pressure

EN 545

Negative internal pressure

Maximum deviation
Shear force
30 DN

-0.9 bar

To prove that the joint is

EN 545

Cyclic internal pressure

Shear force
30 DN

24000 cycles

To prove the joint’s fatigue

EN 545

Positive external pressure

Maximum deviation
Shear force
30 DN

2 bar

To prove that the joint is
resistant to groundwater

EN 545

Positive internal pressure

Maximum deviation
Shear force
30 DN

Set up using seal bush
at 1.5 PFA+5 bar

To prove joint performance
at all pressure levels



Water at 80°C

3 months of cycles

To prove the joint’s ageing
performance PAM


Fine sand infestation

Fine sand heavily
compacted around the joint
prior to pressurizing

First three
EN 545 tests

To prove the resistance to
sand entering the joint


Silt infestation

Compaction 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.
1 / 1
BLUTOP small diameter

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.