| I want to introduct something about AC water | | | | them, and, by providing a high degree of |
| pump. Detailed Description Features: 1. Applicable | | | | redundancy, enables key trunks to be isolated and |
| use in fresh water & seawater 2.Excellent in | | | | maintained. |
| quiet & safty 3.Effectively absorbing oily | | | | Hydraulics |
| pollutant in water 4.Highly keep clean Application: 1 | | | | Flow through the main is not pumped but rather |
| Fountain 2. Pond 3. Aquarium 4. Other | | | | flows by gravity under the driving head of the |
| water-pumping decoration project. Major standard | | | | service reservoirs at the source WTWs. By virtue |
| sepcifications: Dimension(mm): 67x43.6x54 Power | | | | of its depth the pipeline is under some pressure, |
| supply: 220-240/120/12V 50/60HZ Power | | | | however, the hydraulic grade line rarely exceeds |
| consumption(watts): 6 Outlet connection(mm): 1 | | | | ground level, and to enter supply, water must be |
| 2" Flow control: ? Flow rate(l/h):400 Delivery | | | | pumped up into the distribution zones at the |
| head(m): 0.9 IP System : X8 Approved: | | | | various pump-out shafts. In some respects, |
| UL,GS,SAA,CE,BS,CU | | | | therefore, the ring main can be considered as a |
| The Thames Water Ring Main (TWRM) formerly | | | | reservoir (albeit with negligible capacity), from |
| known as the London Water Ring Main (LWRM) is | | | | which supply is drawn as required. An indication of |
| a major part of London's water supply | | | | this dynamic variation in demand is that the |
| infrastructure that consists of an approximately | | | | minimum hydraulic level does move between the |
| 80km system of mostly 2.54m (100") concrete | | | | Battersea and Park Lane pump-out shafts. The |
| pipelines used to transfer potable water from | | | | loop is not closed for hydraulic reasons but rather |
| water treatment works (WTWs) in the Thames | | | | to provide the redundancy that allows any |
| and River Lee catchments to distribution within | | | | segment on the ring to be isolated and drained for |
| London. | | | | maintenance without interrupting the supply to |
| The initial ring was constructed between 1988 and | | | | any shaft. |
| 1993. As of 2006[update], two extensions are | | | | Construction |
| under construction. There are plans for further | | | | The ring main was constructed over two phases, |
| extensions through 2025. | | | | the first comprising the southern leg from |
| Overview | | | | Ashford Common WTW to Barrow Hill Shaft and |
| The average daily flow is approximately 1000 | | | | constructed from 1988 to 1991 and the second |
| megalitres (millions of litres), out of a total London | | | | comprising the northern leg between the same |
| average day demand of approximately 2600 | | | | locations and dating from 1991 to 1993. Each |
| megalitres.[citation needed] The system is not | | | | phase was in turn divided into a number of |
| strictly a ring but currently comprises one major | | | | 'stages' that were separately contracted and |
| loop linking the Hampton, Walton, Ashford and | | | | constructed largely simultaneously. The differing |
| Kempton WTWs clustered on the Thames | | | | contractors involved in each stage is to some |
| upstream of Teddington Weir to central London | | | | degree reflected in the variation in tunnelling and |
| by a southern branch via Brixton and northern | | | | tunnel construction techniques used. |
| branch via Kew and a separate unconnected | | | | Geology |
| length from Coppermills WTW to Stoke | | | | The ring main lies mostly within London Clay with |
| Newington. The pipeline is well below the level of | | | | sections within the overlying alluvium and |
| most water mains, being at a depth of between | | | | underlying Lambeth Group and Thanet Sand. The |
| 10 to 60m below ground level and approximately | | | | predominance of the London Clay lengths is by |
| 10 to 30m below sealevel (as measured with | | | | design, as being easily excavated, largely |
| respect to Ordnance Datum). It is connected to | | | | impermeable and somewhat self-supporting (for |
| the water supply zones by some 20 shafts that | | | | short periods), it is a near ideal tunnelling material. |
| extend from the ring main to ground level. | | | | Where the hydraulics have required entry into the |
| Driver | | | | Lambeth Group and Thanet Sand, tunnelling was |
| The ring main serves as a partial alternative | | | | considerably more difficult. In particular, the |
| transfer system to existing trunk mains which | | | | Thanet Sand requires a high boring torque, is |
| were suffering increasing frequencies and | | | | highly abrasive and, most challengingly, sufficiently |
| severities of leaks and bursts. Being some of the | | | | permeable to contain a water table continuous |
| oldest operational pressure mains in the world (the | | | | with the underlying Chalk and measured at |
| oldest dates from 1838), the high level trunks | | | | pressures up to 4bar. An unexpected entry into |
| have weakened with steady corrosion and | | | | the Thanet Sand while excavating near Tooting |
| concurrently there has been both an increased | | | | Bec Common led to the flooding of the tunnel and |
| carrying requirement resulting from increasing | | | | the temporary abandonment of a Tunnel Boring |
| water demand and increasing external stresses | | | | Machine (TBM). A further consideration of Thanet |
| resulting from higher vehicle weights and | | | | Sand is the presence of glauconite which oxidises |
| frequencies. This has been exacerbated by limited | | | | on contact...(and so on) To get More information , |
| system redundancies which has restricted | | | | you can visit some products about Water Spray |
| preventative refurbishment. The ring main has | | | | Nozzles, malibu fuel pump, . The AC water pump |
| both extended the operational life of the high level | | | | products should be show more here! |
| trunks by reducing the flow demands placed on | | | | |