By American Water Works Association
Up to date from the 1996 edtion, this operations handbook offers functional info on picking, fitting, box checking out, and preserving distribution valves in potable water platforms. It covers the main generic values together with globe, butterfly, plug, ball, cone, gate and cost. Unloading, inspection, garage, install, checking out, upkeep, and record-keeping are defined intimately besides the historical past and conception. This guide could be quite usefeul for small and medium sized businesses
Read or Download Distribution Valves: Selection, Installation, Field Testing and Maintenance PDF
Best hydrology books
This ebook addresses the advance of complex tools for the prediction, the estimation of incidence possibilities and the danger regarding severe hydrological occasions. It additionally discusses the relief of the vulnerability of social, financial, and engineering platforms to severe hydrologic occasions and the lessen in their results on such platforms.
The most recent state-of-the-art learn on flood pulsing and wetland recovery in North the US providing the newest study from leaders within the box of recovery ecology, Flood Pulsing in Wetlands displays the present flow to include flood pulsing into wetland recovery efforts. Emphasizing how imperative flood pulsing is to profitable wetland recovery, the book's members supply descriptions of recovery initiatives throughout North the United States within which flood pulsing has been basically used to revive useful hydrodynamic stipulations to floodplain parts, and increase or retailer crops, flora and fauna, and terrain.
Hydrometry provides a thorough advent to the technological know-how of hydrometry: the dimension of movement in open channels. facing either conventional thoughts and leading edge new equipment and tools, according to the newest ISO criteria, this e-book offers with the most issues of hydrometry: the dimension of water degrees and mattress degrees, of discharge and of sediment shipping; it considers using movement measuring constructions, hydrological networks and the association of surveys.
Extra resources for Distribution Valves: Selection, Installation, Field Testing and Maintenance
Shop Drawings The buyer may request that the manufacturer provide assembly drawings for all valves delivered. The drawings should include clearance requirements, dimensions, and construction type. They should be sufficiently detailed to show that the valve meets the requirements to comply with standards. Figure 3-1 shows a sample shop drawing. The drawings are especially important when the number of turns, input torque, actuator data, and protective coating are not specified in the standard. A knowledge of the exact number of turns and direction to open or close a valve is essential to prevent actuator failure.
The resilient-seated gate valve has a closure member consisting of a gate that may be encapsulated with a resilient material (rubber, urethane rubber, or others) or may contain a separate resilient seat that seals against the body of the valve and provides a tight seal. ANSI/AWWA C509 also allows designs for which the resilient seat is attached to the body. See Figure 3-1 for a sample shop drawing of a resilient-seated gate valve with an outside stem and yoke. These valves are bidirectional and provide a clear waterway when open.
Installation and Maintenance Manuals Maintenance manuals from the manufacturer should be provided for each significant order and for all valves. The manuals should include specific instructions for assembly, installation, and operation. The manuals should include suggested maintenance procedures for the operation of valves in service. 1-1975 class 125 Working Pressure 200 psi Test Pressure 400 psi 15 16 1 R 17 2 3 18 4 19 5 H Open 20 6 21 H Closed 7 22 8 B 9 4 19 20 23 10 24 11 25 12 13 K E F L D 14 Ref Nos.
Distribution Valves: Selection, Installation, Field Testing and Maintenance by American Water Works Association