Cold Water System Testing & Decommissioning PDF

POWERPOINT 5 KEY REQUIREMENTS OF TESTING AND DECOMMISSIONING OF DOMESTIC COLD WATER SYSTEMS  LESSON INTENT. Learners will be able to list the commissioning process for a cold water installation Learners will be able to describe the how the different soundness...

POWERPOINT 5 KEY REQUIREMENTS OF TESTING AND DECOMMISSIONING OF DOMESTIC COLD WATER SYSTEMS  LESSON INTENT. Learners will be able to list the commissioning process for a cold water installation Learners will be able to describe the how the different soundness tests are carried out on different types of pipe materials All learners should be able to describe how to drain down a cold water system ONCE PIPEWORK HAS BEEN INSTALLED INTO A PROPERTY, THE PLUMBER MUST MAKE SURE THAT THE SYSTEM IS: SOUND (NO LEAKS) FLUSHED THROUGH (CLEANED INTERNALLY) DISINFECTED (CHEMICALLY CLEANED) COMMISSIONED (SET UP CORRECTLY)  COMPLETED VISUAL INSPECTION SOUNDNESS TEST FLUSHING OUT DISINFECTING HAND OVER TO CUSTOMER SOUNDNESS TESTING BEFORE SOUNDNESS TESTING, ALWAYS WALK AROUND THE SYSTEM TO MAKE SURE ALL JOINTS HAVE BEEN MAKE – VISUAL CHECK: OPEN ENDS SOLDERED JOINTS MADE COMPRESSION JOINTS TIGHT CLIPS ARE IN PLACE THEN CARRY OUT THE SOUNDNESS TEST: THERE IS A DIFFERENT SOUNDNESS TEST FOR RIGID PIPE (COPPER AND STEEL) AND PLASTIC PIPE. SOUNDNESS TESTING RIGID PIPE (COPPER AND STEEL) SLOWLY FILL THE SYSTEM WITH WATER WALK AROUND THE SYSTEM AND CHECK FOR LEAKS LEAVE TO STAND FOR 30 MINUTES (TEMPERATURE STABILIZATION) ATTACH THE HYDRAULIC TEST BUCKET PUMP SYSTEM UP TO 1.5 X WORKING PRESSURE (IF SYSTEM WORKS AT 3BAR IT SHOULD BE TESTED AT 4.5BAR ETC) LEAVE FOR ONE HOUR CHECK FOR ANY PRESSURE DROP (NO DROP ALLOWED) RECTIFY AND RE-TEST IF NECESSARY  TRUE OR FALSE ON TESTING! YOU SHOULD WALK AROUND THE SYSTEM BEFORE FILLING UP WITH WATER TRUE OR FALSE? True you must walk around and look for lose fittings and unsoldered joints ONCE FILLED YOU SHOULD LEAVE TO STAND FOR 10 MINUTES TRUE OR FALSE?as it must stand for 20 minutes False ONCE THE HYDRAULIC TESTER IS ATTACHED YOU SHOULD PUMP UP TO 1.5 TIMES True THE be this must WORKING done toPRESSURE TRUE ensure that OR FALSE? the pipework can deal with higher fluctuations in pressure. YOU WILL BE LEAVING THE SYSTEM FOR A HOUR ONCE UNDER TEST. True this must be done to ensure that there is no pressure drop TRUE OR FALSE? SOUNDNESS TESTING PLASTIC PIPE (POLYBUTYLENE) SLOWLY FILL THE SYSTEM WITH WATER WALK AROUND THE SYSTEM AND CHECK FOR LEAKS PUMP SYSTEM TO 1BAR – AFTER 45 MINUTES, CHECK FOR LOSS OF PRESSURE INCREASE PRESSURE TO 1.5 X WORKING PRESSURE FOR 15 MINUTES CHECK FOR PRESSURE LOSS REDUCE PRESSURE TO ONE-THIRD FOR A FURTHER 45 MINUTES CHECK FOR PRESSURE LOSS YOU DO NOT WANT TO DAMAGE THE PLASTIC PIPE OR O RINGS WHICHEVER TEST IS UNDERTAKEN, THE SIMPLE PROCESS IS: FLUSHING AND DISINFECTING AFTER A NEW SYSTEM OR SECTION OF PIPEWORK HAS BEEN INSTALLED, ALL THE DEBRIS INSIDE THE PIPE NEEDS TO BE REMOVED AND THE PIPE MADE READY TO CARRY WHOLESOME WATER. THE SYSTEM IS RE-FILLED WITH WATER AND THEN DRAINED DOWN FROM THE LOWEST POINT RE-FILL THE SYSTEM OPEN THE KITCHEN TAP AND ALLOW WATER TO RUN UNTIL CLEAR OF DEBRIS/COLOUR DO LIKEWISE WITH ALL OTHER OUTLETS IN THE PROPERTY ADD DISINFECTANT TO SYSTEM (SODIUM HYPOCHLORITE SOLUTION OR CHLORINE) FOR 1 HOUR – AS BS EN 806 FLUSHING AND DISINFECTING TEST CHLORINE LEVELS AT EACH OUTLET – AS BS EN 806 DRAIN SYSTEM FLUSH SYSTEM THROUGH FROM EACH OUTLET UNTIL NO CHLORINE IS PRESENT AFTER A SOUNDNESS TEST, THE SYSTEM SHOULD ALWAYS BE FLUSHED OUT PRIOR TO BEING HANDED OVER TO THE CUSTOMER. COMMISSIONING MAKE SURE SYSTEM IS COMPLETELY FILLED ADJUST FOV LEVELS IN CWSC AND WCS TEST FLOW RATES AT OUTLETS (LITERS/MIN OR LITERS/SEC) TEST PRESSURE AT OUTLETS (BAR) INSPECT INSULATION OR PIPEWORK AND CWSC INSPECT SUPPORT FOR CWSC (LABEL VALVES) COMPLETE ANY DOCUMENTATION HAND OVER TO CUSTOMER (EXPLAIN) COMMISSIONING A CORRECT INSTALLATION PREVENTS: BACTERIAL GROWTH (STAGNATION) LEGIONELLA (TEMPERATURES 20-460C) NOISE (FLOW OF WATER, WATER HAMMER) DECOMMISSIONING AT SOME POINT A SYSTEM WILL NEED ISOLATING DUE TO A REPAIR, EXTENSION, RENEWAL OR PERMANENT REMOVAL – THIS IS KNOWN AS DECOMMISSIONING. TEMPORARY DECOMMISSIONING: A SYSTEM IS ISOLATED FOR A PERIOD OF TIME WHILE WORK IS CARRIED OUT, AFTER WHICH THE SYSTEM IS PUT BACK INTO NORMAL OPERATION. PERMANENT DECOMMISSIONING: A SYSTEM OR APPLIANCE IS TAKEN OUT OF USE. THE SYSTEM WILL BE ISOLATED AT THE INCOMING MAINS STOP VALVE AND THEN DRAINED. THE PIPEWORK CAN BE REMOVED AND THE PIPEWORK CAPPED EITHER ABOVE THE STOP VALVE, IF THE WHOLE SYSTEM IS DECOMMISSIONED, OR AT THE END OF A BRANCH PIPE TO STOP STAGNATION OF WATER. DECOMMISSIONING IF DECOMMISSIONING, INFORM CUSTOMER OR WORK COLLEAGUES. CAP PIPEWORK AT THE END OF BRANCHES ALWAYS LABEL VALVES AFTER ISOLATION WHILE WORK IS CARRIED OUT, TO AVOID THE VALVE BEING TURNED ON (WARNING NOTICE) ALWAYS DRAIN WATER OFF CORRECTLY TO AN APPROPRIATE LOCATION CHECK AT VARIOUS OUTLETS TO MAKE SURE THE SYSTEM HAS DRAINED OFF IF UNSURE IF THE DRAIN TO THE HOUSE IS CONNECTED TO THE MAINS SEWER, CHECK WITH THE LOCAL AUTHORITY DEAD LEGS PASSIVE DEAD LEG: A SECTION OF PIPEWORK THROUGH WHICH WATER CANNOT BE DRAWN OFF OR FLOW. PIPE NOT BEING CUT BACK TO A BRANCH END OR A DROP WITH NO DOV – THESE CAN GIVE RISE TO BACTERIAL GROWTH. ACTIVE DEAD LEG: A SECTION OF PIPEWORK THROUGH WHICH COLD WATER HAS TO BE DRAWN OFF BEFORE THE HOT WATER IS DRAWN OFF. A LONG SECTION OF PIPE ON THE HOT WATER CIRCUIT (WASTE OF WATER). DRAINING COLD WATER SYSTEMS LOCALISED DRAINING PART DRAINING FULLY DRAIN SYSTEMS DRAINING COLD WATER SYSTEMS ALWAYS DRAINED: FROM THE LOWEST POINT OF THE SYSTEM USING A DOV AND HOSE PIPE SO THE LEAST AMOUNT OF WATER IS WASTED IF MAINTENANCE/REPLACEMENT IS REQUIRED, NEAREST TO COMPONENT, ISOLATING REST OF SYSTEM BUNG KITS COULD BE USED TO A SAFE POINT CHECK YOUR KNOWLEDGE WITH THESE QUESTIONS 1. WHY DO WE HAVE TO PERFORM A SOUNDNESS TEST? 2. IF YOU FIND A LEAK WHEN TESTING WHAT DO WE HAVE TO DO? 3. WHY DO WE HAVE TO FLUSH AND DISINFECT A SYSTEM? 4. WHAT IS TEMPORARY DECOMMISSIONING? 5. WHAT IS PERMANENT DECOMMISSIONING? 6. WHAT ARE THE 3 TYPES OF DRAINING?  TRAFFIC LIGHT IT: WHERE IS YOUR LEARNING AT? 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