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Coil care joins the think tank
Page 33
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A NEW tanker safety valve designed to stop accidental spillage following a snatch hose breakage has been developed by Gall Thomson International Ltd. It is to be fitted as standard to all the road tankers operated by Conoco Ltd.
The valve, known as the Coil Core, is fitted to the tanker discharge faucets and is normally held in the open position permitting the liquid to flow with minimum head loss.
If by accident the tanker moves away from the discharge point while still coupled up a housing is designed to shear at the locating studs which secure the two halves of the assembly.
The breaking strength of these brass studs is designed to be well within the breaking strength of the hose itself. As soon as these bolts shear, a coil support locating a central spring falls away causing an instantaneous shut-off as the spring snaps shut.
The conical design of the spring assembly gives a total sealing length of around eight feet. In this closed position the Coil Core will restrict spillage, thus limiting the fire hazard.
Shut-off is not complete but the drip rate is claimed to be less than two pints per minute under a gravity head of six feet. A demonstration at the Conoco terminal at Cliffe, Kent, proved the effectiveness of the device.
A Guy tractive unit pulled away from the discharge point while still connected up. The studs sheared immediately causing the spring seal to snap shut.
Applications of the Coil Core which is marketed by Gall Thomson International Ltd, Bank Yard, Market Place, Bulwell, Notts, relate to any liquid transfer operation wherever hoses or rigid connection are made. Material specifications suitable for petroleum and chemicals are available and current development includes high pressure units for LPG and cryogenic systems.
The Coil Core weighs 16kg (361b) and costs around E200.