Big Chemical Encyclopedia

Chemical substances, components, reactions, process design ...

Articles Figures Tables About

Water-supply systems fittings

ISO 14236 2000 Plastics pipes and fittings - Mechanical-joint compression fittings for use with polyethylene pressure pipes in water supply systems ISO 14616 1997 Plastics - Heatshrinkable films of polyethylene, ethylene copolymers and their mixtures - Determination of shrinkage stress and contraction stress ISO 14632 1998 Extruded sheets of polyethylene (PE-HD) - Requirements and test methods... [Pg.237]

ISO 14236 2000 Plastics pipes and fittings - Mechanical-joint compression fittings for use with polyethylene (PE) pressure pipes in water supply systems. [Pg.102]

Use of lead materials—The use of solder or flux containing more than 0.2% lead or pipes and pipe fittings containing more than 8% lead is prohibited in public water supply systems. Public notification is required where lead is used in construction materials of the public water supply system, or where water is sufficiently corrosive to cause leaching of lead from the distribution system or lines. [Pg.193]

Assumed in this paper new thresholds for quality safety states fit better to the range of variability of chloroform in real water supply system so they are more appropriate for consideration related to the comprehensive method of safety analysis. [Pg.724]

The high-pressure water supply service is employed for the operation of the ordinary filter pump, which finds so many applications in the laboratory. A typical all metal filter pump is illustrated in Fig. 11, 21, 1. It is an advantage to have a non-return valve fitted in the side arm to prevent sucking back if the water is turned off or if the water pressure is suddenly reduced. Theoretically, an efficient filter pump should reduce the pressure in a system to a value equal to the vapour pressure of the water at the temperature of the water of the supply mains. In practice this pressure is rarely attained (it is usually 4 10 mm. higher) because of the leakage of air into the apparatus and the higher temperature of the laboratory. The vapour pressures of water at 5°, 10°, 15°, 20° and 25° are respectively 6-5, 9-2,12-8, 17 5 and 23 8 mm. respectively. It is evident that the vacuum obtained with a water pump will vary considerably with the temperature of the water and therefore with the season of the year in any case a really good vacuum cannot be produced by a filter pump. [Pg.110]

ISO 4442-5 1997 Pipes and fittings made of unplasticised poly(vinyl chloride) (uPVC) for water supply - Specifications - Part 5 Fitness for purpose of the system. [Pg.98]

Chapter 10 discussed some hydraulics. Bernoulli s equation is an essential engineering principle in fire hydraulics. Losses in pipes, fittings, and other components are adjusted to equivalent pipe length for use in Bernoulli s equation. Distribution systems need regular testing to ensure availability of water supplies when and where needed. [Pg.240]

More recently, attempts have been made to correlate mathematically the chemical composition of natural waters and their aggressivity to iron by direct measurements on corrosion coupons or pipe samples removed from distribution systems. This work has been of limited success, either producing a mathematical best fit only for the particular data set examined or very general trends. The particular interest to the water supply industry of the corrosivity of natural waters to cast iron has led to the development of a simple corrosion rig for the direct measurement of corrosion rates The results obtained using this rig has suggested an aggressivity classification of waters by source type i.e. [Pg.393]

Pipes - pipes are used to move the water from the various water supplies to the control valves of the system and then onto the range pipes in which are fitted the... [Pg.217]

In order to process larger quantities of coal, an extraction reactor was constructed. The extractor was essentially a standing metal cylmder sealed on the bottom, approximately 30 cm in diameter and 84 cm in length. An electrical belt-driven stirring mechanism was fitted through the top of the reactor to provide mixmg, and three elechical band heaters were wrapped around the outside to supply process heat. A water-cooled condenser was also installed to condense NMP durmg reflux The system could routinely extract 1 to 2 kg of coal with 20 to 25 L of NMP. [Pg.213]

A visible cloud of vapor, 1 m deep, spread for 150 m and was ignited by a car that had stopped on a nearby road 25 minutes after the leak started. The road had been closed by the police, but the driver approached from a side road. The fire flashed back to the sphere, which was surrounded by flames. There was no explosion. The sphere was fitted with water sprays. But the system was designed to deliver only haif the quantity of water normally reeommended (0.2 U.S. gal/ft- min. or 8 L/m min.), and the supply was inadequate. When the fire brigade started to use its hoses, the supply to the spheres ran dry. The firemen seemed to have used most of the available w ater for cooling neighboring spheres to stop the fire from spreading, in the belief that the relief valve would pro-teet the vessel on fire. [Pg.167]


See other pages where Water-supply systems fittings is mentioned: [Pg.409]    [Pg.34]    [Pg.702]    [Pg.1768]    [Pg.336]    [Pg.323]    [Pg.59]    [Pg.336]    [Pg.226]    [Pg.87]    [Pg.182]    [Pg.219]    [Pg.87]    [Pg.182]    [Pg.478]    [Pg.256]    [Pg.515]    [Pg.188]    [Pg.51]    [Pg.85]    [Pg.17]    [Pg.130]    [Pg.321]    [Pg.644]    [Pg.700]    [Pg.700]    [Pg.121]    [Pg.490]    [Pg.92]    [Pg.99]    [Pg.498]    [Pg.474]    [Pg.75]   
See also in sourсe #XX -- [ Pg.9 , Pg.60 ]

See also in sourсe #XX -- [ Pg.9 , Pg.60 ]




SEARCH



Water supply

© 2024 chempedia.info