Start Figure 3: Variable pump pressure setting Pump setting pressure, P1 Check pressure at end of index run, P2 P2<1 bar, then adjust pump pressure to P1+ (1-P2) P2>1 bar, then adjust pump pressure to P1- (P2-1) MADE IN GERMANY End High Grade Expansion Joints from ELAFLEX For piping systems of building services, you need compensators to absorb thermal expansion, reduce vibration and noise. ERV rubber expansion joints from ELAFLEX, setting standards for decades and offering the ideal solution. Type ROTEX is an EPDM Rubber Bellows ( PEEK reinforced ) for both LPHW and MPHW to 130 C constant temperature. DIN 4809 approved, no obligation to dismantle this type within 10 years. Many other ERV types available, e.g.: ERV-R: WRAS Approval Type TA: fitted with a white PTFE lining for extensive chemical resistance, FDA approved ERV-GR: for Acids, Alkali and aggressive chemicals ERV-W: white Nitrile ( NBR ) to foodstuff standards ERV-GS: ISO 15540 ( fire resistant ) Email your enquiry to: sales@elaflex.co.uk ELAFLEX Ltd. Riverside House, Plumpton Road Hoddesdon, Herts EN11 OPA Ph. 01992 45 29 50 E-mail: sales@elafl ex.co.uk www.elafl ex.co.uk 64 October 2021 www.cibsejournal.com CIBSE Oct21 pp62-64 PMT.indd 64 Biofilm forms, with time, in drainage traps. When water flows through the trap, bioaerosol is released into the room. Pathogens in aerosol can survive and maintain infectivity for several hours. A procedure called Find & Kill can be used to disinfect drainage traps, using a combination of sodium hypochlorite and ultraviolet-C (UV-C) light. Stage six drainage High concentrations of infected people in a building can contribute to a higher microbial load in the wastewater system. Pathogens can be transmitted between rooms or floors of a building through the drainage ventilation system and ubiquitous microbial biofilms in pipes. Disease can spread when traps are dried up because of pressure fluctuations, evaporation, low use of sanitary appliances, or capillary action when not maintained properly. Adequate ventilation should be provided and individual stacks terminated directly on the roof. Avoid a common vent for several stacks. Self-disinfecting traps will stop pathogens in the wastewater pipes from entering occupied spaces. Stage seven recycling and drainage off site Bioaerosol and biofilm from the public sewer can infect occupants, and is difficult to prevent with current technologies. Drainage traps act as the interface between on- and offsite pipework and the building occupants. UVC light, in combination with periodic chemical disinfection, may help, but there is little research. Until products are developed, careful consideration should be given to the design of the building drainage so that bioaerosol is not released inside the building and traps are not depleted. Conclusion Check out our configurator: ervconfigurator.elaflex.co.uk Ad_2020_ERV_90x270_Ltd_EN.indd 1 Stage five traps Designers should consider all possible exposure pathways, while facilities managers must monitor existing buildings and carry out periodic tests to find traces of contamination. Initial evaluation can be carried out using the PMT, and lab tests of water can be performed at different stages of the public health engineering cycle. Based on results measures in the PMT can be used. The PMT is a useful tool to provide a safe sanitary system in new and existing buildings. CJ This article is a summary of a paper that was presented at the 2021 CIBSE Technical Symposium cibse.org/symposium ASHVEEN JEETUN is an associate public health engineer at Buro Happold 20.07.2020 10:43:40 24/09/2021 15:50