FishmanK
Member
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In seeking information for getting hoses made for a closed loop system, issues of construction details have come up.
"smooth-bore" or "convoluted"?
It strikes me that smooth-bore hoses are mostly used but seemingly, systems that draw down to vacuum and then go to positive pressure in repeated cycles, possibly should be using a hose with a convoluted lining?
"non-conductive" vs "conductive"
this small but concise statement from the goodyear rubber company on this subject, states in conclusion:
"UNLESS A HOSE IS DESCRIBED SPECIFICALLY AND
CLEARLY BRANDED TO BE CONDUCTING OR
NON-CONDUCTING, IT MUST BE ASSUMED THAT THE
ELECTRICAL PROPERTIES ARE UNCONTROLLED"
So while most ptfe hose assemblies are considered to be "non-conductive"
In truth they are more accurately "not conductive" and may not actually be "certifiably non-conductive"?
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Generally, the industry standard uses a PTFE with a stainless steel braided jacket.
More durable, possibly safer hoses are available with PTFE cores, also wrapped by braided-stainless-steel, but with hytrel, pvc, or silicone outer jackets and can be purchased in custom lengths, with professionally fitted ends for very reasonable cost.
Better bend radius and durability as well as color options which present themselves, make this an attractive alternative.
But statements have been made by respected sources that the issue of static built by pumping solvent should be considered.
That certified CONDUCTIVE hoses should be used.
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One major extractor production company now just uses BUNA hoses for cost and durability. But these are by nature not conductive.
A respected industry leader has gone on record stating a preference for conductive carbon impregnated PTFE hose to guard against static buildup from the flow through it.
Clearly, the issue warrants more thought than that put into buying a hose for our garden and plants...
That certified CONDUCTIVE hoses should be used.
--
One major extractor production company now just uses BUNA hoses for cost and durability. But these are by nature not conductive.
A respected industry leader has gone on record stating a preference for conductive carbon impregnated PTFE hose to guard against static buildup from the flow through it.
Clearly, the issue warrants more thought than that put into buying a hose for our garden and plants...
