SC-30 pages

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

Solution

Benefit

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

Long-lasting

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

High-alloys and coatings

316SS and Hastelloy C-276 are standard. Other alloys and
coatings available upon request