68 GROUNDWORKS; EXTERNAL ENVELOPE
pump station should be fitted with two pumps. These pumps will operate as ‘duty standby,’ each pump capable of the full pumping duty requirement. The pumps are located within the pump station via a duck foot/pedestal with guiderails to allow them to be lifted easily and then lowered and re-seated accurately for inspection and maintenance.
The installation, like the pump station, should follow strict guidelines – in essence the chamber should be considered as a waterproof liner, any hydraulic water pressure on the chamber being prevented by the concrete surround
When groundworks and a simpler pump station is required for a house extension, kitchen, toilet or utility room for example, and the property has toilet facilities that are gravity fed to the public sewer, a single pump can be used.
The ideal pump selection for this is one which features a free-flow vortex design, with a free flow passage of 60 mm or greater, and the discharge pipework being 80/100 mm diameter. For small house extensions, a smaller free flow passage pump is often used. This is purely a price saving exercise as the small diameter free flow passage means a more efficient and hence smaller motor pump. In practice the larger free flow diameter allows the easier passage of foreign items, like sanitary items for example. These items should not be flushed, but commonly are.
Floats commonly determine the control of the pump station (four floats for a two- pump station) – start, stop, duty assist and high-level alarm. The control panel will automatically configure a new duty pump every cycle. If the high-level alarm is activated, or if a pump should trip due to clogging or electrical fault, then an alarm will be activated. This alarm can be any, or a combination of: a local beacon, buzzer, connected to a building management system or telemetry remote monitoring. Again, the size of the pumping chamber – just like the pump – can be configured to suit the site conditions; depth of the inlet, or inlets and position of inlets relative to the discharge. This means that the best practice pipe runs can be used, and installation is made easier. The installation, like the pump station, should follow strict guidelines, in essence the chamber should be considered as a waterproof liner, any hydraulic water pressure on the chamber being prevented by the concrete surround.
David Johnson is business development manager at Pump Technology
Picture Frame finish from Metalline supplied in excess of 1000m2
Unit 25 Cambridge Science Park is a state of the art facility featuring an external facade of glass, metallic panels and fins for solar shading. At each corner of the building a chamfered picture frame feature of curtain walling and panels, adds to the modern design. Metalline of A2 Ultima insulated panels, Unity
interlocking rainscreen panels, interlocking soffits, copings, pressings and cills for the project. The picture frame finish to the corners of the building were finished in a slate grey polyester powder coating.
01543 456 930
www.metalline.co.uk Render finish based on Magply performance
The Port of Chatham faces regular assault by storms, prompting the designers for an apartment development on an elevated site to specify a weather resistant render finish to the elevations, applied across Magply boards. For the upper storeys, the 12mm Magply boards are secured across the timber framework infilling the main structure, while
concrete blockwork features right around the ground level podium. This will have timber battens secured to it to create a cavity behind the Magply boards, ready to carry the render treatment. Magply boards carry a variety of internationally recognised accreditations.
01621 776252
www.magply.co.uk
WWW.ARCHITECTSDATAFILE.CO.UK
ADF MARCH 2020
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