Tank Drain Systems
Animation of flexible roof drain hose system
Stages of the roof drain hose in operation, with roof leg protectors installed
TANK DRAIN SYSTEMS
Draining rain water from an external floating roof is important to make sure the external floating roof will not build up too much water on top, which could even cause sinking of the roof in the worst cases. W.E.Couplings Ltd offer an excellent solution by manufacturing tank drain hoses specifically for this application, from a material compatible with the stored medium. The major advantage of a hose is that it has a minimum number of connections, therefore eliminating much of the potential problems with other drain systems. As the drain hose is a complete system, including the connections, the lead ballast cable system is installed prior to dispatch. Each hose is individually tested prior to shipment, to ensure its performance. As a result of the flexible nature of the drain hose, it will even be able to deal with frozen rain water inside.
Flexible hose assemblies for immersion inside storage tanks to drain rainwater from the floating roof. Specially compounded covers are used to resist immersion in high aromatic or corrosive liquids.
Hose like a snake but still in shortest route
Smooth bore, mandrel built, Nitrile (NBR) or Viton (FKM) lined hose, depending on the type of hose specified or required
Textile cord reinforcement with a high tensile stainless alloy wire helix, to resist collapsing by external pressure when immersed
Although these hoses are rainwater drains experiencing low pressures when in use, the integrity of the hose assemblies is checked, after ballasting, by testing to 10 bar with water and vacuum testing to -0.85 bar. Full and detailed test and material certificates are supplied as a standard.
Smooth wrapped finish in the following materials:
PVC/Nitrile Aromatic content up to 80%
Viton® Aromatic content up to 100%
(Tolerance to hazardous environments high in hydrocarbon content)
Lead ballast and branding:
Each hose assembly incorporates a permanently attached lead covered
stainless steel cable to prevent the hose from floating in the stored product.
A longitudinal white stripe is permanently branded on the cover of each hose
to ensure correct alignment. All hoses are supplied electrically continuous.
Clamps and chains for roof attachment are also supplied.
Generally mild steel nipples with fixed ASA150 R/F flanges are supplied. Other flanged drillings and material types are available including swivel flanges. The ballast connection is a stainless steel threaded section permanently welded to the hose nipple. The ballast is secured with two threaded stainless steel nuts.
Floating roof storage tank
Leg Protectors, installed to prevent the hose from catching on/wrapping around the legs as the roof descends.
Animation of fully articulated roof drain system, reinforced by a chain
Example of a three swivel articulated system
We also design and manufacture our own versions of the traditional articulated system, that incorporate greater lateral stability and fold flatter than other designs, to allow the roof to get lower and therefore potentially save many barrels of expensive fuel, or whatever fluid is being stored in the tank.
Render of the W.E. Couplngs 'Tri-Lobe' drain system
Please contact us for further information or assistance:
W.E. Couplings Ltd
Units 2 & 3B Grimeford Industrial Estate
Grimeford Lane, Anderton
Near Chorley, Lancashire PR6 9HL
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