IS 11793 : 1986 Guidelines for design of float-driven hoisting mechanism for automatic gated control

1 Scope

1.1 This standard lays down guidelines for design of afloat-driven hoisting-mechanism for automatic gated-control.

1.2 This standard includes only typical arrangements commonlyused, since possible arrangements are numerous due to a variety oftypes of gates, hoisting-mechanisms, float-drives and automaticflow-control devices (sensors). This may be used to admit water toor drain water from the, float-well in response to deviation of thecontrolled-variable from its predetermined-limits. Designguidelines are therefore limited accordingly (see Fig.1 to 11).

1.3 This standard includes typical arrangements to keepwater-level constant in a hydro-electric and other locationschannel at the upstream or downstream side of the gate.

1.4 This standard includes typical arrangement for emergencyclosure of a power channel feeding a hydro-electric power-house, toprevent damage to the hydraulic turbine and generators by run-awayspeed conditions when sudden load-tripping takes place at the powerhouse.

1.5 This standard does not include the structural design of thegate, the hoisting-mechanism and the other components, for whichrelevant Indian Standards may be referred to. However, outlines ofthe structural arrangements of certain components, where considerednecessary in the interest of functional reliability, are included.