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SC-3

SC-3
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SC-3 High Efficiency Impeller High efficient, low shear impeller with laser designed curved blades providing high strength and low weight which is ideal for long overhung shaft applications Deep tank mixing applications require long agitator shaft extensions, as well as lower rotational speeds to avoid critical speed problems. In the past, to develop the required flow in deep tanks, it was necessary to reduce the impeller speed and increase the impeller diameter to avoid critical speed problems. This technique added weight, as well as cost, and often pushed impeller-to-tank diameter ratios over 50%. When the impeller-to-tank diameter ratio exceeds 50%, a typical high efficiency impeller loses mixing effectiveness. The Chemineer® SC-3 Impeller features an advanced design that produces flow characteristics of much larger impellers, without the added weight or the resulting loss in pumping efficiency. The highly efficient SC-3 Impeller’s reduced weight allows for the use of longer shaft extensions for deeper tanks, and resolves associated critical speed limitations. The use of an SC-3 Impeller can frequently produce significant agitator cost savings. extensively in the design of the SC-3 Impeller. Because large variations in discharge velocity can produce inefficiencies, significant efforts were made in the development of the SC-3 to maintain a relatively flat velocity profile. The discharge velocity profile is flatter than for most other high efficiency impellers under turbulent flow conditions. Our laboratory LDA (Laser Doppler Anemometry) system was used Optimal Design Design Requirement Long in-tank shafts without steady bearings Lighter-weight impeller Ability to effectively operate in taller tanks while conserving drive size, maintaining ChemScale level Operate below first critical speed High-flow impeller Allows for smaller SC-3 diameters. Lower impeller weights are thus achieved, resulting in robust shaft designs operating below critical speed with unrestricted speed turndown Advanced blade design As a result of the contoured blade form, the SC-3 is inherently stronger than older designs and is able to handle demanding, high-fluid-force mixing conditions Materials variety 316SS and Hastelloy C-276 are standard. Other alloys and coatings available upon request

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Average Velocity Profile Comparison Typical High Efficiency Impeller ^Chemineer ^Prochem &Kenics Email: chemineer@nov.com 7 Cranmer Road, West Meadows Email: chemineeruk@nov.com Chemineer China Room 2006, Modern Plaza Email: chemineercn@nov.com Email: navinfo@nov.com International Sales National Oilwell Marco has produced this brochure for general information only, and it is not intended for design purposes. Although every effort has been made to maintain the accuracy and reliability of its contents, National Oilwell Marco in no way assumes responsibility or liability for any loss, damage...

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