Tutorial
Figure 2
Quantum chassis mounting plate on Standoffs
Mounting Holes match Modicon 984
984 Backplate with Wiring arm adapter screw holes.
affinity laws will change the power by the cube for a given change in speed; however, the pressure changes by the square, and the flow changes proportionally. If we want to save 10% of energy in a constant speed pump, we need to figure out what speed will be needed, and how that affects our pressure and flow. It turns out that an approximate 10% reduction is obtained when a 60-hertz motor is reduced to 58-hertz. This results in about a 6.5% drop in pressure and a 3.3% drop in flow. When we consider that most pumps are oversized, this minor reduction in speed and pressure can be accommodated by many systems.
Hendrick Screen Company is a worldwide supplier of wedgewire and profile bar screens to the municipal water, waste water, fish diversion, power distribution, industrial and OEM markets.
Our large product offering includes passive water intake screens, flat intake and fish diversion screens, header laterals and pipe laterals, sieves and strainer screens.
We manufacture screens utilizing 304 and 316L stain- less, duplex and super duplex stainless and copper nickel.
Hendrick Screen is ISO-9001 certified, located in the United States, offers design and specification preparation assistance for your water/waste water screen projects.
Contact Mike Isbill, Product Manager at (270) 685-5138
email mike.isbill@hendrickscreenco.com
Are there other benefits to using a VFD in a constant speed system? Yes, these include reduced mechanical stress, and thus less maintenance. This reduction also helps to relieve pressure on the maintenance budget.
POWER AND AUTOMATION EQUIPMENT LIFE EXTENSION A good bit of capital is tied up in the power and automation equipment within a municipality. Over time, this equipment will need to be replaced; however, buying new can cost a substantial amount of money, and even more must be spent on labor to remove the existing equipment and installing the new systems. This does not include any additional resources that may be required for temporary systems during removal and installation of this equipment.
3074 Medley Road Owensboro KY 42301 PH: (270)685-5138 www.hendrickscreenco.com www.waterintake.com
A better way exists. For automation systems, you can look at systems that fit into existing panels. Sometimes, the replacement system has adapters that can fit into the bolt holes of the existing hardware, and
36 Water Online The Magazine, Cleanwater Edition ■ wateronline.com