Product category:
Pumps, Vacuum pumps
News Release from: SPX Process Equipment | Subject: Tall Oil pumps
Edited by the Processingtalk Editorial
Team on 21 March 2007
Special pump for bio-fuel bulk transfer
to storage
Plenty Mirrlees Pumps, an SPX Process equipment company, has developed a solution for the bulk transfer of Tall Oil into storage tanks, using its Twinro W125 and W225 pumps
Plenty Mirrlees Pumps, an SPX Process equipment company, has developed a solution for the bulk transfer of Tall Oil using its Twinro W125 (125 m3/hr) and W225 (225 m3/hr) pumps These electric motor driven pumps are used for unloading cargo ships to storage tanks
This article was originally published on Processingtalk on 9 Aug 2004 at 8.00am (UK)
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The Tall Oil, which is produced from Scandinavian trees, is a product currently being introduced to UK industries as a new bio-fuel having low environmental emissions.
The construction of this pump presented Plenty Mirrlees with a problem - the company had to produce an engineering solution to ensure complete sealing of the product.
The Twinro is a positive rotary twin screw pump developed primarily for the bulk transfer of liquids.
Twin screw pumps are fully self-priming and have excellent air/vapour handling characteristics which makes them ideally suited to applications involving tank and line stripping.
The pumping element consists of two contra-rotating shafts from which right hand and left hand epicycloid screw shapes are accurately machined.
The screw set conveys the fluid being pumped from each end and out through the centre.
The screw shafts are carried in roller bearings at the drive end and ball bearings at the non-drive (gear case) end.
The driven (lower) screw is synchronised from the driving (upper) screw by a pair of hardened and ground timing gears.
To satisfy non-lubricating products, the Twinro has been designed with four mechanical seals to contain the product with the timing gears and bearing outside the pumped fluid.
The mechanical seals are normally unheated and flushed by the product in the suction chamber as it passes the seal.
However, in the case of this application were the seal area to cool, the tall oil will crystallize and failure of the seal will occur.
To ensure that adequate heat is maintained at the mechanical seals, Plenty Mirrlees incorporated a steam quench and flush into the design this involving a complete re-design of the seal chamber area.
According to Jim Miller of Plenty Mirrlees, this design of pump has proved to be successful and now that Government subsidies are available for the use of this fuel, the Company sees more potential orders coming from the enquiries for this application.
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