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44 Hygienic design of floor drainage componentsThat drains might contribute to segregation or zoning, andindeed their impact hygienically on the facility, is a matterfor debate, though reference to drainage is made in anumber of EHEDG derived publications (Lelieveld, Mostert,Holah 2003; 2005; 2011). Zhoa et al. (2006) in their studyof Listeria in poultry plants noted the importance of drains“Floor drains in food processing facilities are a particularlyimportant niche for the persistence of Listeria and can be apoint of contamination in the processing plant environmentand possibly in food products” (ibid, p. 3314).However, even when the provisions contained in componentstandards are adopted, these are not necessarily alignedwith best hygienic practice. For example, the standard EN1253 permits the design of gullies with an effective sump, asillustrated in Figure 6. Here, the obvious sump provides all ofthe potential ingredients for bacterial growth.More recent work by Berrang et al. (2012) studied Listeriamobilization from the drain by inadvertent water spray duringcleaning operations, with subsequent potential to transfer tofood contact surfaces. Of note, Berrang cites studies wheresuch bacteria have been detected in oor drainage evenafter extensive plant sanitation (ibid p. 1328).Reducing the potential for harbourage of such pathogensshould be a key concern of any oor drainage productmanufacturer concerned with hygienic principles.Figure 6. Horizontal gully as portrayed in BS EN 1253.Floor drainage issues in practiceGenerally, two main issues give rise to hygienic concernissues related to installation, and in particular the oor-todraininterface, and issues related to the component designitself. Here, the latter is considered.The choice of materials for drainage component manufactureis extensive and not necessarily constrained by the keyEuropean standard (EN 1253). Typically, where hygienicconsiderations apply, stainless steels are advocated. Withthe readily available supply of appropriate grade sheet,it should come as no surprise that many components arefabricated by none drainage-specic companies. Linearchannels in basic form, especially, can be easily fabricated,as can simple ‘box type gullies. It is estimated that morethan 200 suppliers fabricate drainage components in theEuropean Union (EU) alone (ACO 2009), the vast majorityof which are primarily fabrication companies with no specicexpertise in drainage. Consequently, there is huge variationin how oor drains are fabricated, two examples are shownin Figure 5.It thus becomes necessary to supplement general standardswith further guidance. In the case of the oor gully, manyof the design aspects of European Hygienic EngineeringDesign Group (EHEDG) guidance documents, particularlyDocument 13, may be economically incorporated in productdesign.ACO has sought to incorporate in its componentsContinuous welding of jointsRadiused cornersDrainabilityThe new horizontal gully in Figure 7 shows a oor drainbody that addresses the above points.Figure 5. A case for improved drainage component design.For the facility operator, specication of components thatmeet appropriate standards – Euronorms or their regionalcounterparts – ensures compliance with a number of criteria,not the least of which are load bearing and hydraulic capacity.As a matter of course, certication should be requested fromcomponent suppliers (e.g., for the internal oor gully therecommended reference is EN 1253 [2003]).Figure 7. Floor gully body addressing key principles of hygienicdesign.
ACO. The future of drainage.We take hygienic performance one step further.Deep-drawn body ensures smoothcontours eliminating crevices that cannest dangerous bacteria.All radiuses are largerthan 3mm which greatlyincreases the cleaningeffectiveness.Edge in-fill ensures stable anddurable transmission betweenthe gully and surrounding floorand helps to minimize the riskof floor cracks that preventsbacteria growth.Dry sump design, completely drainable- eliminating potential problemsof bacteria growth.ACO gully ACO pipe ACO slot channelACO tray channelACO gully design takes hygienic performance one step further. We focus on the exactingrequirements in the food production industry, applying standards reserved for food contactsurfaces EN 1672 and EN ISO 14159 to the gully design. All our building drainage productsare tested according to European standards EN 1253, EN 1433 or EN 1124.More than 60 years of drainage experience makes ACO the world class supplier ofdrainage systems.www.aco-buildingdrainage.com
Page 1 and 2: EHEDGYearbook 2013/2014European Hyg
Page 3 and 4: Contents 3An example of the develop
Page 5 and 6: European Hygienic Engineering & Des
Page 9 and 10: EHEDG Executive Committee members 9
Page 11 and 12: EHEDG Company and Institute members
Page 13 and 14: EHEDG Company and Institute members
Page 15 and 16: EHEDG membership 15EHEDG membership
Page 18 and 19: 18 Legal requirements for hygienic
Page 22: 22 The importance of hygienic desig
Page 26: European Hygienic Engineering & Des
Page 31 and 32: Research on hygienic flooring syste
Page 33 and 34: PROVIDING LEVEL & FLOW INSTRUMENTAT
Page 39 and 40: Precise, safe and fast : GEMÜ 660h
Page 46 and 47: 46 Hygienic design of floor drainag
Page 48 and 49: 48 Hygienic design of high performa
Page 52 and 53: 52 Performance testing of air filte
Page 56 and 57: 56 Spray cleaning systems in food p
Page 58 and 59: 58 Spray cleaning systems in food p
Page 62 and 63: 62 Environmentally friendly water b
Page 64 and 65: 64 Environmentally friendly water b
Page 68 and 69: 68 Flow behaviour of liquid jets im
Page 72 and 73: 72 ptimisation of tank cleaningThe
Page 74 and 75: 74 ptimisation of tank cleaningReal
Page 78 and 79: 78 Effective tank and vessel cleani
Page 80 and 81: 80 Effective tank and vessel cleani
Page 82 and 83: Figure 8a/b. In-line sprayer (a)
Page 84 and 85: 84 Practical considerations for cle
Page 86 and 87: 86 Integrated hygienic tamper-free
Page 88 and 89: 88 Damage scenarios for valves: Ide
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European Hygienic Engineering & Des
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solidscomponents andcomplete plants
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Material and design optimisation ca
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Improved hygienic design and perfor
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Smart hygienic solutions for the fo
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A cleaner,healthierfuture.Cleaning
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Examination of food allergen remova
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Hygienic automation technology in f
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Cleanability test of a hygienic des
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Aspects of compounding rubber mater
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New developments for upgrading stai
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New developments for upgrading stai
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International Hygienic Study Award
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EHEDG Regional Sections 131MEICOPro
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EHEDG Regional Sections 133In Octob
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EHEDG Regional Sections 135EHEDG De
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EHEDG Regional Sections 137EHEDG Ge
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EHEDG Regional Sections 139Members
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EHEDG Regional Sections 141EHEDG Li
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EHEDG Regional Sections 143Beside t
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EHEDG Regional Sections 145To promo
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EHEDG Regional Sections 147EHEDG Ru
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EHEDG Regional Sections 149and adva
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EHEDG Regional Sections 151Translat
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EHEDG Regional Sections 153EHEDG Uk
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EHEDG Guidelines 155Doc. 7. A metho
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EHEDG Guidelines 157Doc. 18. Passiv
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EHEDG Guidelines 159Doc. 28. Safe a
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EHEDG Guidelines 161Doc. 37. Hygien
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EHEDG Guidelines 163EHEDG Congresse
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EHEDG Subgroups 165design, selectio
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EHEDG Subgroups 167Given a clean su
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EHEDG Subgroups 169Doc. 26 Hygienic
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EHEDG Subgroups 171It will address
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EHEDG Subgroups 173EHEDG Subgroup
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EHEDG Subgroups 175Chairman:Andy Ti
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EHEDG Subgroups 177EHEDG Subgroup
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