Flexibility of a metal flexible hose is result of its convolutions bending. A flexible hose life time depends on its bending stiffness, working temperature, corrosive condition, pressure and applied vibrations. Braid doesn&#;t affect hose flexibility so much, but a flexible hose which is exposed to excessive tension, might over elongate and consequently the corrugations might get opened up. For higher pressures two braid layers are applied and for vacuum or extremely low pressure situations a corrugated hose without any braid might be used

In situations similar to earthquake in which in addition to thermal expansions / contractions , accessories might be under accidental loads , there shall exist an ability of multidirectional movement absorption and U-type flexible hoses are kinds of best options in such situations U-type flexible hoses allow boilers , chillers , fan coils and other similar systems to move freely in relation to the rest of the structure. U-type flexible hoses are also being used in order to prevent nozzles from cracking or being cut. Flexible hoses are totally applied in different industries like steel , cement , food , petroleum , gas , petrochemical and etc

If it is going to be dispatched immediately after coiling and packing, then the “hose” becomes a product, e.g. solar flex hoses. On the other hand, if it is going to be delivered as a “ flexible hose assembly” it must pass through at least one of the stations mentioned below. During these processes, the semi-finished products are subjected to one or several leakage tests. In other words, each product will have been tested at least times in total without any exceptions.

The end pieces of flexible hose fittings such as nipple, coupling/sleeve (usage with union nut), nut, etc. can be manufactured from materials such as stainless steel, carbon steel, chrome coated, brass, chrome coated brass, etc. in conformity with TS EN standards as desired or stipulated by the standard. In the nonstandard application, the right material selection by user/manufacturer is important such as in the hose.

For situations in which we need more bending flexibility, hoses with Ω shaped corrugations are applied that for the sake of increasing number of convolutions per unit length without thickness reduction of the bellows plate, they benefit from a longer lifetime in bend loadings. This type of flexible hose tends to return to its initial form when released from loading and also they are appropriate for vacuum situation. Ω shaped corrugations are more pressure resistant as well