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DRAINABILITY

HOSES > TEFLON®
 

Drainability Testing of Hose Assemblies

Introduction
This test programme was designed to determine the drainability of water from 1” Bioflex, Corroline and Pharmaline hose assemblies in comparison with a 1” polished stainless steel tube assembly and in comparison with 1” Smoothbore FEP and PTFE lined hose assemblies from other suppliers.
Although the test programme specifically assesses the ease of drainability, these results are considered to be equally relevant to the ease of cleanability of the hose assemblies, and the potential for entrapment of fluids passing through.

Test Procedure
Assemblies with different designs of clamp type (Triclover) end fittings were evaluated.
Each hose assembly was held straight and filled with exactly 500g of water. The assemblies were then tilted at various angles to the horizontal and the water was allowed to drain from one end for 30 seconds. The drained water was immediately weighed in order to determine the weight of water remaining trapped inside the hose assembly.

Results
(weights in grams of water trapped inside the hose assemblies after draining)

Angle of Tilt

SS Pipe

*Bioflex Integral PTFE Lined Ends

* Bioflex Non-Lined Ends

Smoothbore Hose Integral Lined Ends

Smoothbore Non-Lined Ends

Smoothbore Hose PFA/PTFE Encapsulated Ends

15°

3.4

3.5

4.9

3.6

5.1

5.9

30°

2.7

2.9

3.6

2.8

3.7

4.2

45°

1.9

2.0

2.5

2.1

2.7

3.6

60°

1.4

1.5

1.8

1.5

1.9

2.3

90°

1.0

1.0

1.1

1.0

1.1

1.6

*The results for Corroline and Pharmaline were almost identical to those for Bioflex and so have not been included

Conclusions
The results clearly show that when the end fittings do not restrict the bore of the hose, as in the case of the SS tube assembly and hose assemblies with integral lined end fittings, then there is no significant difference between the results for Bioflex, the SS tube and the other suppliers’ smoothbore hose products.
Significant differences were, however, introduced with hose assemblies fitted with conventional, non-lined end fittings, when the trapped water increased by an average of 27%.
In the case of the PFA or PTFE encapsulated end fittings, the increase was much more significant at 62%. This is not surprising due to the much larger restriction in bore for this type of end fitting, which also leads to flow rates reduced by more than 50%.
It is generally concluded that the small ripples in the bore of Bioflex, Corroline and Pharmaline do not have any significant effect, but the end fitting design has a very significant effect upon the entrapment of fluids in the bore of PTFE lined hose assemblies.
Note: For full information about Bioflex, Corroline and Pharmaline please refer to the Individual Brochures section under downloads on the Aflex Hose website www.aflex-hose.com

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