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Diaphragm-operated differential pressure gauge
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Submersible motor pump As its name suggests, the OpenWell submersible pump from CRI is designed for application in water supply and irrigation projects, specifically on well duties and other relatively light water transfer operations in the agricultural, municipal, rural or domestic garden sector.
free fresh water, which does not contain any solids or fibers.
The centrifugal pump can operate under water and has a maximum flow rate capability of 144 m3/hr. The maximum head capability is 57 m. End users can specify a motor with a power range of 0.75 kW to 2.2 kW or for more arduous duties a topend motor is available with a power rating of up to 13 kW. Operational speed is 2900 rpm and the pump can only operate with abrasive-
The water filled, rewindable, submersible motor on the pump features water lubricated thrust and journal bearings, which should allow for high axial thrust loads. The design creates a wedge of water between the shoe and the disc thereby providing better water lubrication and increasing the life cycle of the thrust bearings claim the manufacturers. In addition, the centrifugal motor
According to the manufacturers, dynamically balanced impellers should provide end users with vibration free operation and a good service life.
pump is also cooled by the water it is submerged in. Operation outside of water is not possible. The stator is wound with special water proof bi-axially oriented synthetic film insulated winding wires and made up of low watt loss steel laminations assembled under pressure, rigidly locked in a stator shell. A dynamically balanced rotor should ensure uniform clearance and a reasonable life cycle for the bushes and motor. The motor seal solution is made by means
of grommets, O-rings, oil seals and sand guards to prevent the ingress of well water into the unit.
The OpenWell submersible pump from CRI can achieve a flow rate of 144 m3/hr in water supply and irrigation applications and ther relatively light water transfer projects.
Diaphragm-operated differential pressure gauge Mid-West Instrument has introduced its Model 142 differential pressure gauge, which utilises a diaphragm to provide zero leakage capabilities on pump systems.
The Model 142 differential pressure gauge can be specified with dials measuring 6.35 cm, 8.89 cm, or 11.43 cm. Plastic or
anodized aluminium dial assemblies can be selected dependant upon whether the end user intends to use the device in arduous
outdoor environments or not. Reverse pressure ports can be also specified and a limited five-year warranty is available.
The device can be used with fluids, wet gas or solids-laden flows across a wide range of industrial processes. Typical end use applications include as a control option for regulating the flow and metering of product liquids. A differential pressure range from 0 to 1.7 bar (0-25 psid) is available to end users. It is this differential pressure that can be harnessed for use as a control mechanism on pump duties. The pressure containing elements on the device can be specified in brass, which gives a safe rated working pressure of 103 bar (1500 psi), or in aluminium and 316/316L stainless steel allowing an operational pressure of up to 207 bar (3000 psi). The elastomer materials available for the diaphragm include Buna-N, Viton and EPR.
WORLD PUMPS August 2004
www.worldpumps.com 7
Submersible motor pump As its name suggests, the OpenWell submersible pump from CRI is designed for application in water supply and irrigation projects, specifically on well duties and other relatively light water transfer operations in the agricultural, municipal, rural or domestic garden sector.
free fresh water, which does not contain any solids or fibers.
The centrifugal pump can operate under water and has a maximum flow rate capability of 144 m3/hr. The maximum head capability is 57 m. End users can specify a motor with a power range of 0.75 kW to 2.2 kW or for more arduous duties a topend motor is available with a power rating of up to 13 kW. Operational speed is 2900 rpm and the pump can only operate with abrasive-
The water filled, rewindable, submersible motor on the pump features water lubricated thrust and journal bearings, which should allow for high axial thrust loads. The design creates a wedge of water between the shoe and the disc thereby providing better water lubrication and increasing the life cycle of the thrust bearings claim the manufacturers. In addition, the centrifugal motor
According to the manufacturers, dynamically balanced impellers should provide end users with vibration free operation and a good service life.
pump is also cooled by the water it is submerged in. Operation outside of water is not possible. The stator is wound with special water proof bi-axially oriented synthetic film insulated winding wires and made up of low watt loss steel laminations assembled under pressure, rigidly locked in a stator shell. A dynamically balanced rotor should ensure uniform clearance and a reasonable life cycle for the bushes and motor. The motor seal solution is made by means
of grommets, O-rings, oil seals and sand guards to prevent the ingress of well water into the unit.
The OpenWell submersible pump from CRI can achieve a flow rate of 144 m3/hr in water supply and irrigation applications and ther relatively light water transfer projects.
Diaphragm-operated differential pressure gauge Mid-West Instrument has introduced its Model 142 differential pressure gauge, which utilises a diaphragm to provide zero leakage capabilities on pump systems.
The Model 142 differential pressure gauge can be specified with dials measuring 6.35 cm, 8.89 cm, or 11.43 cm. Plastic or
anodized aluminium dial assemblies can be selected dependant upon whether the end user intends to use the device in arduous
outdoor environments or not. Reverse pressure ports can be also specified and a limited five-year warranty is available.
The device can be used with fluids, wet gas or solids-laden flows across a wide range of industrial processes. Typical end use applications include as a control option for regulating the flow and metering of product liquids. A differential pressure range from 0 to 1.7 bar (0-25 psid) is available to end users. It is this differential pressure that can be harnessed for use as a control mechanism on pump duties. The pressure containing elements on the device can be specified in brass, which gives a safe rated working pressure of 103 bar (1500 psi), or in aluminium and 316/316L stainless steel allowing an operational pressure of up to 207 bar (3000 psi). The elastomer materials available for the diaphragm include Buna-N, Viton and EPR.
WORLD PUMPS August 2004
www.worldpumps.com 7