Download On the Radial Velocities of Five Nebulae in the Magellanic by Wilson R. E. PDF

By Wilson R. E.

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By Wilson R. E.

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Until 1983, Section 35 of the Electricity (Scotland) Act 1979 required anyone desiring to build a hydro-electric scheme in excess of 50kW to obtain the consent of the Secretary of State for Scotland (which would in practice be given only after consultation with the Scottish Electricity Boards). The Energy Act 1983 amended this situation by replacing the 50 kW limit with one of 1MW. Thus, although the limit for a private developer in England and Wales is now for most practical purposes 10MW, in Scotland ministerial consent procedures have to be followed for a scheme over 1MW.

One type has a steel core with a spun concrete lining and a prestressed mortar casing. 4 m and a working pressure of 120-m head at 1-m diameter and 60-m head at the largest diameter. In a hydro-electric scheme, the possible reason for concern about this type of pipe is that a faulty section of the concrete lining might come adrift and damage the turbine. The delivered cost of these various pipes is surprisingly uniform—within a range of some 20%. The ductile cast iron type is the least expensive.

If the sets are grid-connected, cognizance must be taken of the Electricity Council’s Recommendations. K. is likely to be mainly in the mini- and micro-hydro range of set sizes and the summary and conclusions (Section 6 of this Report) have been biased towards this. , it is recognized that in developing countries a considerable degree of improvisation in hydro-electric engineering is practised. K. for grid-connected installations. —an easy question to ask, but a difficult one to answer. Much depends on the country in which the equipment is manufactured and installed.

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