Tank Drain Systems
W.E. Couplings Ltd have been established since 1991, specialising in the supply of bespoke hose and fittings.
W.E. Couplings manufacture and stock a wide range of industrial rubber and PVC hose in long lengths,
which can be assembled to your individual requirements.
In floating roof storage tanks for fuel & oil, etc., there must be a method of removing rainwater from the dynamic roof. W.E. Couplings Ltd design and manufacture a range of systems for this purpose, from economical flexible rubber hose systems, to long-lifetime stainless articulated pipework systems.
We have supplied these systems to storage tank builders and tank farm maintenance teams worldwide for over a decade, and continue to offer a fast and reliable turnaround on a quality range of drain systems. Each storage tank can present a different challenge, and require a bespoke solution for drainage.
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 economic solution by manufacturing rubber tank drain hoses specifically for this application, from a material compatible with the stored medium - i.e. Nitrile rubber or for more aggressive mediums a high quality Viton®. 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 hydrostatically 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.
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 aid negative bouyancy 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.
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.
Animation of a flexible roof drain hose system
Stages of the flexible roof drain hose in operation, with roof leg protectors installed
Fuel storage tanks
Floating roof storage tank
2D CAD & 3D Design to simulate articulated drain system working in tank
Animation of quadruple flexible hose drain system in a huge 110 Meter diameter storage tank
Articulated 4 swivel joint roof drain system
Articulated 4 swivel joint roof drain system, reinforced by supporting chain
Example of a three swivel articulated system
3D Render of the W.E. Couplings 'tri-lobe' articulated drain system
Flexible drain hose with roof leg protectors to help prevent damage
Leg protectors, installed to help prevent the hose catching on the roof legs
Animation of a fully articulated roof drain system, reinforced by a chain
Detail of the roof sump with non-return valve, and chain supporting top of
Enquire about our products:
Units 1,2,3b Grimeford lane ind. EST.
Grimeford lane, anderton, chorley
LANCASHIRE, ENGLAND PR6 9HL
Tel: +44 (0)1257 475101
FAX: +44 (0)1257 482424
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