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107 Their electrical resistance on full length as measured by ISO standard 112 should be lower than 10 6 ohms. 87, 88įuel dispensing hoses are specified by ISO standard.
87 The maximum permitted resistance between the fittings of the entire section of hose is expected to be below 2×10 6 ohm/m. The ISO standard specifies electrical conductivity of rubber hoses. In Handbook of Antistatics (Second Edition), 2016 3.25.15 HOSES With the requirement for a thin-walled hose capable of flexing, it is limited to low-pressure dilute phase conveying, but it does provide a simple and effective means of conveying this type of material.
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The pipeline needs to be supported so that it is free to move, but having sufficient support so that it is maintained reasonably straight. If such materials are conveyed through a thin-walled rubber hose, the natural movement and flexing of the hose, resulting from the pulsations of the air under pressure and the material transfer through the pipeline is generally sufficient to dislodge any material that has a tendency to adhere to the pipeline wall. This is particularly the case with ultra-fine powders and materials that have a fat content, or some other substance that makes the material sticky. This coating can gradually increase in thickness until it builds up to such an extent that it results in the pipeline being blocked. In steel pipelines, cohesive and sticky materials have a tendency to adhere to the pipeline wall and form a coating. This is why the pressure drop for flow through the rubber hose is greater than that through the steel pipeline and because pressure drop increases with the square of velocity, this is why it increases with increase in conveying air velocity.
If the rubber absorbs more of the energy of impact of the particles than steel, a greater pressure drop, caused by having to reaccelerate the particles from a lower velocity, will result for the rubber pipeline.
Rubber, being resilient, will have a lower coefficient of restitution for impacting particles than steel. It is suspected that the coefficient of restitution between the particles and the pipeline wall plays an important part. The program was repeated with barite and a similar set of results was obtained. Comparison of pressure drop data for steel and rubber hose pipelines By the same mechanism, the impact energy of friable materials can also be absorbed and so particle degradation may also be reduced appreciably. Although the hardness of the surface material is generally much lower than that of alternative metal surfaces, and of the particles impacting against the surface, it derives its erosive wear resistance from the fact that it is able to absorb much of the energy of impact by virtue of its resilience. Rubber hose has the capability of withstanding erosive wear better than steel pipeline in certain situations. Its natural flexibility makes it ideal for use in vacuum off-loading applications, mobile conveying systems, and for joining pipeline sections in situations where standard pipeline bends will not match the geometry required. Its particular properties also make it ideal for use in systems where the material being conveyed may be friable, abrasive, or cohesive. Rubber hose is widely used in conveying systems for both pipeline and bends and in systems where a degree of natural flexibility is required. David Mills, in Pneumatic Conveying Design Guide (Third Edition), 2016 Rubber Hose
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