Sealing connections

Re-equipment of sealing connections

Complete handling of retrofitting projects


We apply the principle of retrofitting sealing connections: "Everything from a single source, if possible". For us, the project begins with the assumption of the problem and ends with the handover of the converted sealing connection. As a result, there are no problems in the coordination of the trades and in matters of guarantee.


At the customer's request, services can of course also be extracted from the detailed offer and implemented by the customer himself.


The following processing sequence is applicable to shell and tube heat exchangers, high pressure steam boilers, air coolers, plate heat exchangers, RTJ connections, all standard flange connections as well as fittings and slow-running shafts.

  Step 1: Calculation and evaluation  


Problematic sealing connections are always recalculated. The cause of the leak can often be derived from the calculation result.



There are various calculation models available for flange connections. The results of the calculation according to EN 1591-1 (2009) are very meaningful, but require a certain amount of experience, since various input values such as coefficients of friction, additional forces, sealing parameters, temperature approach and assembly technology are subject to tolerances and - if set incorrectly - the result can be extremely falsified.

Step 2: Defining materials and dimensions  


To equip a sealing connection, all materials should be used to a high degree in order to achieve a high level of inherent elasticity in the sealing connection. In doing so, the highest possible difference between the minimum sealing force and the permissible sealing force should be achieved.



If a critical discharge of the gasket is to be expected in the event of load changes or over the service life, additional supporting elements should be provided (additional springs).

Step 3: Material supply 


All materials required for sealing can be supplied. Connection parts can also be provided by the customer if they meet the defined requirements.





Sealing kits consist of the components

  • sealing materials
  • screws / nuts
  • Spring washers (optional)
  • material test certificates

Step 4: Assembly preparation and installation 


Installation is carried out in accordance with installation instructions contained in the documentation. Included are

  • Installation instruction including tightening torques
  • lubrication plan
  • Spring arrangement (optional)

The assembly is carried out by experienced and trained personnel using torque wrenches, hydraulic screw technology or bolt tensioning equipments. Each flange assembly is documented and handed over to the client together with an signed and accepted tightening protocol. 

Step 5: Complete documentation  


The selection of the materials, geometries and the load on the sealing connection is documented in a external verified document.


Documentations are created according to EIT company standard 333 and contains all calculations, drawings, installation instructions, material certificates, etc. This company standard can be viewed on request.
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