Low surface tensions can allow nozzles to be operated at lower pressures. Nozzle wear is indicated by an increase in nozzle capacity and by a change in the spray pattern, in which the distribution (uniformity of spray pattern) deteriorates and increases drop size. Choice of a wear-resistant material of construction increases nozzle life. Because many single fluid nozzles are used to meter flows, worn nozzles result in excessive liquid usage. The material of construction is selected based on the fluid properties of the liquid that is to be sprayed and the environment surrounding the nozzle. Spray nozzles are most commonly fabricated from metals, such as brass, Stainless steel, and nickel alloys, but plastics such as PTFE and PVC and ceramics (alumina and silicon carbide) are also used. Several factors must be considered, including erosive wear, chemical attack, and the effects of high temperature. Automotive coating: automotive coating demands droplet from 10-100 micron size uniformly deposited on substrate. Applications of spray technology are more pronounced during the course of base and clear coatings process which are encompassed as the last stages in automotive coating. Among others rotary bells mounted on robots and hvlp (high volume, low pressure) sprayers are widely used   Spray drying      Puttenham, Surrey  Puttenham is a village in Surrey, England just south of the Hog's Back which is the narrowest stretch of the North Downs. Puttenham is south of the A31 which runs between Guildford and Farnham along the spine of the Hog's Back. Villages nearby include Wanborough, Shackleford and Compton. Puttenham lies in the so-called Vale of Holmesdale between the chalky North Downs to the north and Greensand Ridge to the south. To the south west of the village is Puttenham Common. The houses of Puttenham mainly line the road 'The Street' that runs through it from west to east, making it a largely linear settlement. Puttenham was referred to in the Domesday Book of 1086 and was called "Reddesolham" or "Rodsall". Its domesday assets were owned by the Bishop of Bayeux. Its domesday assets were: 1 plough, of meadow, woodland worth 4 hogs. It rendered £2 per year to its feudal overlords. Queen Victoria reviewed some troops from Frowsbury Hill on 7 July 1858. Puttenham Priory is a large house at the eastern end of the village.