Cold Water Supplies into Domestic Dwellings PDF

POWERPOINT 2 REQUIREMENTS OF THE COLD WATER SUPPLIES INTO DOMESTIC DWELLINGS  LESSON INTENT Learners will understand the different fluid categories Learners will look at the requirements for the installation of an incoming main supply to a domestic property Learner...

POWERPOINT 2 REQUIREMENTS OF THE COLD WATER SUPPLIES INTO DOMESTIC DWELLINGS  LESSON INTENT Learners will understand the different fluid categories Learners will look at the requirements for the installation of an incoming main supply to a domestic property Learners will be able to identity the key differences between a Direct and Indirect cold water system Learners will be introduced to the Cold Water Storage Cistern (CWSC) Learners will look at the differences between grey water recycling and rainwater harvesting FLUID CATEGORIES  CAN YOU REMEMBER THE FLUID CATEGORIES? 1. DEFINE FLUID CATEGOR Y 1 – Wholesome drinking water Water that would be classed as cat 1 except form colour odour & 2. DEFINE FLUID CATEGOR Y 2 – appearance 3. DEFINE FLUID CATEGOR Y 3- Fluids with a slight health risk 4. DEFINE FLUID CATEGOR Y 4- Fluids with a significant health risk 5. DEFINE FLUID CATEGOR Y 5- Fluids with a severe health risk  INCOMING MAINS MAINS Service pipe FERRULE/ISOLATION 25mm MDPE (min) METER/ISOLATION Ducted Rising main COMMUNICATION PIPE 15mm (min) 750-1,350MM DEEP Stop valve 15MM (MIN) DOV STOP VALVE DOV  WATER METER S INTERNAL AND EXTERNAL METER S Internal meter needs to be cross bonded A boundary for safety meter box  MDPE PIPE IS BLUE TO IDENTIFY WHOLESOME WATER MINIMUM SIZE TO MODERN PROPERTY IS 25MM SOFT COPPER CAN BE USED (R220) BUT WE GENERALLY USE HALF HARD (R250) METER IS COMMONLY INSTALLED AT THE PROPERTY BOUNDAR Y IN A CHAMBER (PROTECTION , FROST, READING) SOME METER S ARE INTERNAL AND INSTALLED TO RISING MAIN WATER CAN BE ISOLATED IN THE ROAD, AT THE METER, OR AT THE POINT OF ENTR Y TO THE PROPERTY EVER YTHING FROM THE EXTERNAL STOP VALVE AT THE METER IS REGULATED UNDER THE WATER REGULATIONS 1999.  THE WATER REGULATIONS STATE: AS FAR AS REASONABLY PRACTICABLE, A STOP VALVE SHOULD BE LOCATED INSIDE THE BUILDING, ABOVE FLOOR LEVEL, AS NEAR AS POSSIBLE TO THE POINT OF ENTR Y. IT SHOULD BE INSTALLED SO, WHEN CLOSED, WILL PREVENT WATER GOING TO AN Y POINT IN THE BUILDING. WATER UNDERTAKER S RECOMMEND NO MORE THAN 150MM OF MDPE IS ABOVE FLOOR LEVEL (IT DEGRADES IN SUNLIGHT). EITHER A SCREWDOWN (BS1010) OR A LEVEL ARM (BS6675) STOP VALVE CAN BE USED. THE STOP VALVE WORK S BY THE HANDLE BEING TURNED. THIS IN TURN SCREWS DOWN A JUMPER WITH A WASHER ATTACHED. THIS WASHER IS PUSHED AGAINST A SEATING TO CREATE A WATERTIGHT SEAL. IF THE VALVE JAMS, A COST EFFECTIVE METHOD OF REPAIR IS TO REPLACE THE HEAD GEAR ONLY. THE DOV WORK S USING A SPANNER OR KEY ON THE SQUARE DRIVE. THIS IN TURN SCREWS DOWN A JUMPER AND WASHER ONTO A SEATING, TO CREATE THE WATERTIGHT SEAL. A DOV MUST BE INSTALLED ABOVE THE INCOMING STOP VALVE AND AT EVER Y LOW POINT IN THE SYSTEM.  PLUMBING SYSTEM MUST COMPLY WITH THE WATER REGULATIONS EVER Y PLUMBER MUST PREVENT CONTAMINATION OF WHOLESOME WATER ADVANCE NOTICE MUST BE GIVEN OF INSTALLATIONS BENEFIT FROM BECOMING AN APPROVED PLUMBING CONTRACTOR, AFTER PASSING THE WATER REGULATIONS TRAINING COUR SE WRAS HAS PRODUCED THE GUIDE TO THE WATER REGULATIONS, WHICH IS THE ESSENTIAL GUIDE FOR PLUMBER S  TWO KEY TESTS WITH COLD WATER SYSTEMS: PRESSURE FLOW RATE Flow rate is tested Pressure is at each outlet normally first tested near to the point of entry PRESSURE PRESSURE REFER S TO THE FORCE BEHIND WATER FLOW. NORMALLY, IN DOMESTIC SITUATIONS, A VISUAL CHECK IS SUFFICE BUT WHEN INSTALLING CERTAIN APPLIANCES, A MORE ACCURATE READING NEEDS TO BE TAKEN – WATER SOFTENER S, COMBINATION BOILER S, UN-VENTED CYLINDER S, OR IF PIPEWORK IS BEING ALTERED DRAMATICALLY. PRESSURE IN PLUMBING SYSTEMS CAN BE CREATED BY TWO BASIC MEANS: EITHER A PUMP CAN BE FITTED (MAINS WATER IS ALSO PUMPED WATER ), OR PRESSURE CAN BE CREATED BY THE WEIGHT OF WATER – THE HEAD. FLOW RATE THIS IS THE VOLUME OF WATER DISCHARGING TO AN APPLIANCE, AND IS MEASURED IN LITRES PER MINUTE. SO, IF THE FLOW RATE WAS POOR, THE BATH WOULD TAKE LONGER TO FILL UP. NORMALLY, IN A DOMESTIC SITUATION , A VISUAL CHECK WOULD SUFFICE BUT YOU CAN ALWAYS CHECK BY USING A FLOW CUP OR WEIR CUP (THIS WOULD BE CRITICAL WHEN SETTING UP A COMBINATION BOILER OR MONITORING AN UNVENTED CYLINDER ). 60 LITRES/MIN = 1L/SEC 6 LITRES/MIN = 0.1L/SEC PRESSURE AND FLOW THESE CAN BE EFFECTED BY: DAILY DEMAND (PEAK PERIODS) LOCATION AGE OF PROPERTY DISTRIBUTION MAIN SIZE INCOMING MAIN SIZE INSTALLATION PIPE SIZE MATERIALS USED NUMBER OF ELBOWS ETC BLOCKAGES DIRECT SYSTEM THIS IS A COLD WATER SYSTEM WHERE ALL THE COLD WATER IN THE PROPERTY IS SUPPLIED DIRECTLY TO EACH OUTLET ON MAINS PRESSURE – HIGH PRESSURE. THE SIZE OF SERVICE PIPE TO THE HOUSE IS USUALLY 25MM MDPE, WHICH IS CONNECTED TO 15MM COPPER IN THE HOUSE. OLD HOUSES MAY HAVE 20MM MDPE COPPER OR LEAD MAINS. ON A DIRECT SYSTEM, IT IS IMPORTANT TO TAKE PRECAUTIONS AGAINST BACKFLOW. DIRECT SYSTEM THIS IS A COLD WATER SYSTEM WHERE ALL THE COLD WATER IN THE PROPERTY IS SUPPLIED DIRECTLY ON TOP OF EACH OUTLET ON MAINS PRESSURE – HIGH PRESSURE. DIRECT SYSTEM THE ONLY STORED WATER IS FOR THE HOT WATER SYSTEM VIA THE CYLINDER. ONLY ONE DOV IS REQUIRED TO DRAIN THE SYSTEM DOWN. ALL PIPEWORK CAN BE 15MM DUE TO THE SYSTEM BEING HIGH PRESSURE. DIRECT SYSTEM ANOTHER DIRECT SYSTEM IS WHEN A COMBINATION BOILER IS USED, AND BOTH HOT AND COLD ARE DIRECTLY OFF MAINS. IN THIS CASE, THERE IS NOT STORED WATER AT ALL. AN UNVENTED OR WATER JACKET HEATER HOT WATER SYSTEM WOULD BE THE SAME. DIRECT SYSTEM ADVANTAGES: POTABLE WATER AT EVER Y DRAW OFF POINT GOOD PRESSURE AT ALL DRAW OFF POINTS NO CONCERNS ABOUT STORAGE CISTERNS IN LOFTS DISADVANTAGES: IF THE MAINS IS TURNED OFF YOU ARE WITHOUT WATER PRESSURE VARIES DURING THE DAY AND AT PEAK TIMES PRESSURE CAN BE VER Y LOW (6.30–8.30AM AND 5–7PM) CARE WHEN FITTING SHOWER S/MIXER TAPS INDIRECT SYSTEM THIS IS A COLD WATER SYSTEM IN WHICH THE COLD WATER IS TAKEN VIA THE RISING MAIN TO A HIGH-LEVEL STORAGE CISTERN. FROM THERE, MOST OF THE COLD WATER OUTLETS ARE FED – LOW PRESSURE – EXCEPT THE KITCHEN SINK, WHICH IS MAINS-FED TO SUPPLY WHOLESOME WATER. THE DISTRIBUTION PIPE FROM THE STORAGE CISTERN NEEDS TO BE EITHER 22MM OR 28MM, AND REDUCES IN SIZE AS APPLIANCES ARE FED.  INDIRECT SYSTEM A LOW PRESSURE SYSTEM FEEDING MOST OUTLETS IN THE PROPERTY. INDIRECT SYSTEM ADVANTAGES: STORED SUPPLY OF HOT WATER, SHOULD MAINS BE TURNED OFF THE SYSTEM PRESSURE IS UNAFFECTED BY PEAK TIME DEMAND (CONSTANT PRESSURE) DISADVANTAGES: MORE PIPEWORK IN ROOF SPACE – RISK OF FREEZING POSSIBLE CONTAMINATION OF WATER AT DRAW-OFF POINTS – STORAGE CISTERN ONLY ONE DRAW-OFF POINT GIVES POTABLE WATER MORE EXPENSIVE COLD WATER STORAGE CISTERN IF A COLD WATER STORAGE CISTERN IS REQUIRED, BOTH BS EN 806 AND THE WATER REGULATIONS OUTLINE: IF SUPPLYING EITHER HOT OR COLD –100-150LTS IF SUPPLYING BOTH HOT AND COLD –230-250LTS BY INSPECTING THE LOFT TO SEE THE CWSC, OR BY TESTING THE OUTLETS, THE SYSTEM CAN BE IDENTIFIED. RAINWATER HARVESTING THIS CAN SAVE A HOUSEHOLDER LARGE VOLUMES OF MAINS WATER AND REDUCE THE PRESSURE ON THIS RESOURCE. THESE STORAGE CISTERNS ARE INSTALLED BELOW GROUND AND COLLECT WATER FROM GULLIES. THE AVERAGE SIZE MAY BE 5,000 LITRES. GREY WATER RECYCLING THIS SYSTEM COLLECTS WASTE WATER FROM BATHS, SHOWER S AND WASHING MACHINES. IT IS COMMONLY USED TO FLUSH WCS.  WITH BOTH RAINWATER AND GREY WATER, IT IS IMPORTANT TO PREVENT CONTAMINATION OF WHOLESOME WATER THESE SYSTEMS MUST BE INDEPENDENT PIPEWORK MUST BE IDENTIFIED PROPERLY THESE SYSTEMS ARE EASIER TO INSTALL ON NEW BUILDS RATHER THAN RETRO-FIT THESE ALSO HELP WITH THE INCREASING GREEN DEMANDS OF SOCIETY TO IDENTIFY WHICH SYSTEM IS INSTALLED IN A PROPERTY THE PLUMBER COULD: TAKE A PRESSURE READING AT VARIOUS OUTLETS GO UP IN THE LOFT AND IDENTIFY THE CISTERN SIZES TURN OFF THE INCOMING MAINS AND IDENTIFY THE OUTLETS THAT STOP FLOWING AN IMPORTANT FACTOR IS, WHICHEVER SYSTEM IS INSTALLED, THE OUTLET HAS SUFFICIENT PRESSURE AND FLOW FOR THE APPLIANCE.  TEST YOUR KNOWLEDGE WITH THESE QUESTIONS. 1. WHAT IS FLUID CATEGOR Y ONE WATER? 2. WHAT IS THE MAXIMUM DEPTH OF THE INCOMING MAIN? 3. WHERE WOULD YOU FIND A STOP VALVE? 4. WHAT WOULD YOU FIND A DRAIN OFF VALVE? 5. WHAT DOES GREY WATER RECYCLING REUSE?  TRAFFIC LIGHT IT: WHERE IS YOUR LEARNING AT? RED = I HAVE NOT REALLY UNDER STOOD THE CONTENT WE HAVE STUDIED TODAY (WRITE DOWN 2 QUESTIONS THAT YOU NEED HELP WITH) AMBER = I HAVE UNDER STOOD THE CONTENT ON EFFECTIVE QUESTIONING (WRITE DOWN 1 ONE QUESTION YOU NEED TO CLARIFY) GREEN = I HAVE UNDER STOOD ALL THE CONTENT (WRITE DOWN ONE EXAMPLE FROM WHAT WE HAVE STUDIED)