Event: NO, INADEQUATE, FAULTY, OR INCORRECTLY INSTALLED BACKFLOW PREVENTION DEVICE Possible hazards: Germs; chemical determinands. Level of risk: High D2.4.2.1 See D2.4.1.1. See D2.4.1.1. Identify the premises from The backflow which prevention backflow device not occurred and actually install connected, or appropriate connected device. improperly. Event: NO, INADEQUATE, FAULTY, OR INCORRECTLY INSTALLED BACKFLOW PREVENTION DEVICE (cont’d) D2.4.2.2 Annual inspection See D2.4.1.1. Check on and testing of qualifications An illegal cross backflow prevention of staff connection to devices. undertaking the reticulated connections. system. Ensure that only appropriately qualified persons are permitted to carry out connection work undertaken for the water supplier. D2.4.2.3 Annual inspection, See D2.4.1.1. testing and The backflow replacement, where prevention necessary, of device may have backflow prevention failed safe, but devices. may then have been removed to Implementation of a maintain the comprehensive flow and not spare parts policy. been replaced. D2.4.2.4 Develop guidelines See D2.4.1.1. Identify the in conjunction with premises from No backflow local authority so which prevention that the supply backflow device installed engineer is occurred and because of informed of install insufficient changes in the use appropriate knowledge of of premises by the device. activities on the part of the authority premises. concerned with the registration of building modifications. Annual inspection and testing of backflow prevention devices. D2.4.2.5 Annual inspection See D2.4.1.1. and testing of Failure of backflow prevention backflow devices. prevention device.
Event: NO, INADEQUATE, FAULTY, OR INCORRECTLY INSTALLED BACKFLOW PREVENTION DEVICE Possible hazards: Germs; chemical determinands. Level of risk: High D2.4.2.1 The backflow prevention device not actually connected, or connected improperly. See D2.4.1.1. See D2.4.1.1. Identify the premises from which backflow occurred and install appropriate device. Event: NO, INADEQUATE, FAULTY, OR INCORRECTLY INSTALLED BACKFLOW PREVENTION DEVICE (cont’d) D2.4.2.2 An illegal cross connection to the reticulated system. Annual inspection and testing of backflow prevention devices. Ensure that only appropriately qualified persons are permitted to carry out connection work undertaken for the water supplier. See D2.4.1.1. Check on qualifications of staff undertaking connections. D2.4.2.3 The backflow prevention device may have failed safe, but may then have been removed to maintain the flow and not been replaced. Annual inspection, testing and replacement, where necessary, of backflow prevention devices. Implementation of a comprehensive spare parts policy. See D2.4.1.1. D2.4.2.4 No backflow prevention device installed because of insufficient knowledge of activities on the premises. Develop guidelines in conjunction with local authority so that the supply engineer is informed of changes in the use of premises by the part of the authority concerned with the registration of building modifications. Annual inspection and testing of backflow prevention devices. See D2.4.1.1. Identify the premises from which backflow occurred and install appropriate device. D2.4.2.5 Failure of backflow prevention device. Annual inspection and testing of backflow prevention devices. See D2.4.1.1.