FOOD & BEvErAGE


OvErCOmiNG THE TOP FOUr PUmPiNG CHAllENGES OF THE BrEwiNG AND DiSTilliNG iNDUSTrY


Peter McGarian, managing director at Seepex UK, demonstrates how switching to a progressive cavity (PC) pump can deliver efficiency, productivity and energy gains to help brewers and distillers thrive, not just survive, throughout the pandemic and beyond.


and spirits remains strong. For breweries, this has been driven in part by consumer taste for craft beers; while in the distilling sector, there has been an increased demand for authentic and flavoured products such as artisan gin. But while brewing and distilling operations of all sizes – from artisan craft to large and highly automated – remain popular, ring fencing already tight profit margins is critical if producers are to shoulder the economic burdens of COviD-19. The many challenges faced throughout the


D


brewing or distilling process can be divided into three major areas: raw materials handling, production, and waste handling. in each of these, accurate control of product flow is essential to ensure the final product quality is consistently high. Pumps are therefore integral to brewing and distilling operations. However, not all pumps are created equal. Switching to a progressive cavity (PC) pump can deliver efficiency, productivity and energy gains to help brewers and distillers thrive.


1 GriSt MixinG and tranSfer


The brewing or distilling process starts by mixing milled grain (grist) with water in a vessel known as a mash or lauter tun, where the starch is converted into sugar. Traditionally, the grain is cracked and stored in a grist case and then gravity-fed into a ‘masher’, where it is mixed with hot water prior to entering the mash tun. However, in newer or smaller breweries, the grist case often sits below the mash tun, with a conveyor system transferring the grist to the masher. This not only involves high incremental costs but can also add complexity to the conveying system, leading to mixing problems; water is often added unevenly, resulting in a mix that is not


A flexible alternative to expeller units, SEEPEX open hopper pumps are used for spent grain handling as well as grist mixing and transfer


12 APril 2021 | FACTOrY&HANDliNGSOlUTiONS


espite the unprecedented impact on the UK’s hospitality sector as a result of the COviD-19 pandemic, our appetite for beer


homogenous and reduces the yield. An ideal alternative to complex


conveyor systems are PC pumps in Seepex’s BT range. These offer installation and mashing-in flexibility, allowing the grist to be mixed with hot water and then pumped into the mash tun. Comprising a feed hopper and an auger feed screw, the pitch and diameter of the auger can be adjusted for optimal product feed, ensuring a homogenous mix and a stable yield. One producer who is already enjoying the benefits is ringwood Brewery in Dorset. Thanks to the installation of a Seepex BT pump underneath the grist case, its grist is now carried safely, effectively and consistently to the mash tun. The time taken for transfer has been cut in half, improving production and almost doubling mashing capacity. in addition, the pump system has been fitted with Smart Conveying Technology (SCT); an innovation from Seepex that enables rapid dismantling and cleaning, increasing pump stator life by up to 200 per cent and reducing maintenance time by up to 85 per cent.


2 YeaSt handlinG


A critical process for any brewery or distillery is the fermentation stage; when yeast is added to the wort to convert simple sugars into alcohol. Yeast is shear-sensitive so requires very gentle and hygienic handling to avoid damaging it, which would ultimately have a detrimental effect on the taste of the beer or spirit. Choosing the right yeast pump is therefore crucial. Peristaltic pumps are sometimes used at this


stage, but their pulsating action can have a negative effect on the quality of shear-sensitive products like yeast. By contrast, Seepex’s BCF


3 flavoUr and ColoUr doSinG


The addition of flavours and colours into beers and spirits must be done accurately and constantly to ensure even distribution and a consistent final product, with any additives metered in a non- pulsating manner. Positive displacement pumps are sometimes used but their pulsating action means that once they have dispensed a product, there is a pause before they can dispense again. This results in a gap in the process, which can cause uneven distribution of ingredients. in contrast, Seepex’s PC dosing pumps (D


range) are virtually pulsation-free and their output is directly proportional to the rotational speed of the pumping elements. This linear accuracy, varied using the pump speed, enables easy calibration and control. Their ability to meter very low flow rates means that colours, flavours and portions are all consistent, and they


SEEPEX BCF progressive cavity pumps are ideal for


gentle and hygienic handling of shear sensitive products like yeast


range of PC pumps offers more gentle and hygienic handling, better preserving the yeast quality for fermentation. This is because PC pumps move the product through the pump in a series of cavities, which prevents slip from the discharge back through the pump. Slip creates shear, so compared to other pump designs which have clearances between the lobes, screws or gears, PC pumps have a very low shear action. They are also good at handling entrained air and foam; important for brewers and distillers as the yeast can gain a foamy consistency at this stage. At the end of the fermentation process, yeast


can also be recovered for re-use (known as harvesting) by discharging from the conical base of closed vessels (bottom cropping) or skimming from the surface of open vessels (top cropping). in either case, the low shear characteristics of the BCF range offer advantages over alternative pumped methods or inefficient manual procedures.


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