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Prolyte Renews TUV Certificates
Prolyte has recently renewed all TUV certificates on their complete 30- and 40 series of truss. The TUV certificates for the 20-series and S series truss are already made to the new standards. Apart from all the loading data, the design values of the truss are also given, these are partly specified on a separate sheet. The loading tables are complying with the new DIN 4113 standard.
The fact that Prolyte publishes these design values makes it possible for users to make comparisons between several types of truss on an equal basis. It’s Prolyte’s deliberate policy to be open and clear about the material specifications and calculation methods of the truss it manufactured.
The company Prolyte feels it is in the interest of both the customer and the user that calculation methods are clear and that the truss can be safely used if the loading data are respected. It is from this respect that Prolyte has made the huge effort to recalculate their series of truss and to re-certify the truss according to equal design values and calculation methods.
As Marc Hendriks, head of engineering stated: “Prolyte really takes a vanguard position in this matter. No other truss manufacturer yet has shown this kind of openness about the way they manufacture their truss and what specifications and calculation methods they use. We are aware that we put Prolyte in a vulnerable position, but at the same time we think that it contributes hugely to the safe use of truss. In this regard, our priority lies with safety for our customers and users.”
There are two sets of loading data given, one with a limit on the amount of deflection and one without. In this regard Prolyte point out that most trusses have an allowable deflection that is by far larger than anyone looking at the truss would tolerate. Often a deflecting truss looks unsafe (because of the bending) before it actually is.
Apart from that there are also practical issues that would not allow for a truss with a huge deflection, e.g. when curtains are used (these will sweep the floor in the middle of a deflecting truss, while being to short on the outer ends), although from a loading point of view it is still no problem.
You can find all new certificates on the Prolyte website, http://www.prolyte.com
19th November 2004
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