Specifications

Enquiry Specification for Wagon Tippler with Side Arm Charger and Associated works
NRO/CON/WT/533
EPI – New Delhi Volume-2B, Rev.0 Page 13 of 63
(C) Equipment Specification
The equipment for "DFDS" dust control system is grouped into two main
categories.
(1) Main Equipment
The main equipment shall include spray bar assemblies fitted with dual-fluid air
driven acoustic oscillator atomizing nozzles, pressure regulating units, and flow
activation stations for ON-OFF control of the system and instrumentation for
auto operation.
(2) Auxiliary Equipment
The auxiliary equipment shall include water storage and pumping unit with
duplex water filter and associate electrical works, air and water piping,
enclosures, necessary hoods and skirt boards on belt conveyors / equipment to
suit spray nozzle operation. Starter cum control panel shall be provided at
pumping station and local control panel shall be provided at different
application points.
(D) Brief Specifications of various components of the system are given
below
(1) Spray bar assemblies
The spray bar assemblies shall be manufactured from stainless steel tubing
drilled and tapped for connection of nozzle adapters. A specially designed and
selected dual fluid atomizing nozzle shall be fitted into each of the adapters.
These nozzles are fitted with acoustic oscillators for atomizing the water into
droplets of micronic size by passing them through a field of high frequency
sound waves. The nozzles shall be of stainless steel while the adaptors shall be
of brass. Each spray bar shall be provided with mounting brackets and flexible
hoses for connection to the air & water pipeline.
(2) Pressure regulating units (PRU)
The performance of "Dry Fog" type dust control system is critically related to
the size of water droplets. The nature and particle size of dust generated in the
material handling system changes with change in size and characteristic of the
material. In practice, the sizes of the dust particles have a very wide spectrum
(1-800 microns).
A careful control of air and water flow & pressure is therefore necessary to
obtain optimum dust suppression results. For this purpose, pressure regulating
units shall be provided in the system. The pressure regulating unit shall consist
of diaphragm type pressure regulator with pressure gauge and ball valve for
isolation of air and water line. The operator can adjust both the air and water
pressures independently to change the fog characteristics to obtain optimum
dust suppression results vis-a-vis the site requirements. The pressure
regulators shall be installed in a metallic enclosure with inspection door with
rubber sealing arrangement. Flexible hose shall be provided for connection of
PRU to the air & water pipeline.