MACOGA Expansion Joints are designed, manufactured and tested in accordance with:
If specially requested or included in the terms of the contract, the Expansion Joints can also be designed according to various international standards and codes, including AD-Merkblatter B13, Stoomwezen D 0901, Suomen SFS 2773 or CODAP.
Design control and modifications are set out in the latest
version of our Quality Control Manual and the Quality Procedure
"Design and Calculation".
MACOGA uses different methods for producing the metal bellows depending upon a range of different contributing factors (eg. diameters, the number of sheets used, the materials used, etc.), although in all cases the bellows are manufactured using seamless tubes or metal cylinders welded along their length. The methods used are as follows: Expanding, Elastomeric, Hydraulic and Roll forming.
Circular Expansion Joints are manufactured with single or multiple ply with a diameter ranging from 15 to 8000 mm.
Our manufacturing range includes Circular Expansion Joints of the following types:
As well as Rectangular Expansion Joints which, with limitless dimensions, can be supplied with different convolution and corner types:
The use of circular multiply bellows are the ideal solution for Expansion Joints which are exposed to high pressures. This system involves constructing a bellows using several thin sheets instead of one single thick ply. This technique considerably improves the flexibility of the bellows, its most important characteristic.
There are five main advantages to be gained from using multiply metal bellows:
They guarantee important savings:
The essential component of an Expansion Joint resides in the degree flexibility of its bellows and this depends upon the design of its convolution and the materials used during the production process.
The choice of metals to be used in manufacturing the bellows,
being the basic component of the Expansion Joint, is made
taking the following criteria into account:
The tables shows the materials mostly used to produce our bellows: