Isla de Man – Flujo Detener 2 X 22″ Gas de red
Situado en South Quay, cerca de un depósito de gas, el 200 secciones metros de dos vías alimentados principal eran abandonados para que los gobernadores podrían instalar con el fin de conectar a un sistema de presión media.
Dos operaciones de parada de flujo x dos vías, utilizando un total de ocho bolsas, were carried out by a two-man team using the Foam Bag™ technique, desarrollado por Steve Vick Internacional. The Foam Bags were introduced into each of the live mains, either side of the cut-off points, via standpipes installed into 2” tappings through standard Wask bases.
The bags are constructed of semi-porous fabric and have an integral steel support bar to which a nylon fill tube is fitted. Through this an expanding resin foam is introduced using a mix and inject machine. Due to the large diameter of this main, the bags were of a double-skin construction. The inner bags were filled initially and allowed to cure before the outer bags were filled. On full expansion, some of the foam seeps through the bag to adhere to the surface of the main creating a more effective seal.
The flow stopping project took half a day to complete. Filling of the Foam Bags™ began at 09.00 and was completed by 10.30. By 14.30, the main had been cut and capped. Billy Hay, Distribution Manager for Manx Gas, reported that the job went perfectly. “Using conventional, mechanical flow stopping methods would have cost far more than the Foam Bag™ operation,” he said.
Fecha de publicación – 11th August 2005
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