Editing Impeller (section)

===Open===
An open impeller has a hub with attached vanes and is mounted on a shaft. The vanes do not have a wall, making open impellers slightly weaker than closed or semi-closed impellers. However, as the side plate is not fixed to the inlet side of the vane, the blade stresses are significantly lower.<ref name="nzdl">{{cite web |title=Pump Design and Characteristic |url=http://www.nzdl.org/gsdlmod?e=d-00000-00---off-0hdl--00-0----0-10-0---0---0direct-10---4-------0-1l--11-en-50---20-about---00-0-1-00-0-0-11-1-0utfZz-8-00-0-0-11-10-0utfZz-8-00&cl=CL1.11&d=HASH011f05bf8734d88d1a080257.15.5&gt=1 |website=The New Zealand Digital Library}}</ref> In pumps, the fluid enters the impeller's eye, where vanes add energy and direct it to the nozzle discharge. A close [[Hydraulic clearance|clearance]] between vanes and pump volute or back plate prevent most of fluid from flowing back. Wear on the bowl and edge of vane can be compensated by adjusting the clearance to maintain efficiency over time.<ref name="Open vs. Closed">{{cite web |title=Open vs. closed impellers – Mc Nally Institute |url=http://www.mcnallyinstitute.com/14-html/14-02.htm |website=mcnallyinstitute}}</ref> Because the internal parts are visible, open impellers are easier to inspect for damage and maintain than closed impellers. They can also be more easily modified to change flow properties. Open impellers operate on a narrow range of [[specific speed]]. Open impellers are usually faster and easier to maintain.  For small pumps and those dealing with suspended solids, open impellers are generally used.<ref name="mpeller-types">{{cite web |title=Open and Closed Impellers |url=https://www.turbomachinerymag.com/impeller-types/ |website=Turbomachineary International|date=15 September 2017 }}</ref> Sand locking does not occur as easily as with closed type.