Cold Water Pipework Installations PowerPoint

POWERPOINT 4 REQUIREMENTS FOR PIPEWORK INSTALLATIONS IN DOMESTIC COLD WATER SYSTEMS  STARTER ACTIVITY THINK ABOUT WHAT YOU LEARNT LAST LESSON. MAKE 5 QUESTIONS ON WHAT YOU LEARNT AND THEN SWAP WITH THE PERSON NEXT TO YOU!  LESSON INTENT...

POWERPOINT 4 REQUIREMENTS FOR PIPEWORK INSTALLATIONS IN DOMESTIC COLD WATER SYSTEMS  STARTER ACTIVITY THINK ABOUT WHAT YOU LEARNT LAST LESSON. MAKE 5 QUESTIONS ON WHAT YOU LEARNT AND THEN SWAP WITH THE PERSON NEXT TO YOU!  LESSON INTENT Learners should be able to list what the five different Fluid categories are and write examples of each one Learners will be able to describe what backflow is and why it is important to prevent it Learners will look at the different types of back flow prevention and where they are used  INSULATION THIS IS THE INSTALLATION OF MATERIAL TO PREVENT THE TRANSMISSION OF HEAT: HEAT LOSS, HEAT GAIN OR FROST PROTECTION. GOOD INSULATING MATERIAL USES STILL AIR TO AN ADVANTAGE AND SHOULD BE OF ADEQUATE THICKNESS AND HAVE THE FOLLOWING CHARACTERISTICS: IT SHOULD NOT BE FLAMMABLE IT SHOULD BE VERMIN PROOF IT SHOULD BE DRAUGHT PROOF IT SHOULD BE IMPERVIOUS TO MOISTURE IT SHOULD BE SUFFICIENTLY ROBUST FOR THE JOB ANY PIPEWORK IN A VULNERABLE POSITION SHOULD BE INSULATED. OUTSIDE LOFT AREA UNDER SUSPENDED DOWNSTAIRS FLOOR OUTHOUSE SERVICE PIPE (750-1,350MM) SERVICE PIPE ENTRANCE (WITHIN 750MM) TEMPORARY SUPPLIES (STANDPIPE) HOT AND COLD PIPE PROXIMITY  MATERIALS APPROVED MATERIALS INCLUDE: COPPER, PLASTIC, BARRIERED PLASTIC, GALVANISED LCS, STAINLESS, GUN METAL, BRASS, ALUMINIUM. NON-APPROVED MATERIALS INCLUDE: LEAD AND THOSE NOT LISTED ON THE WRAS REGISTER.  FLUID CATEGORIES Fluid category Description Example 1 Wholesome water supplied from the water undertaker Mains water 2 Water that would be classed as Cat 1 Hot water in cylinder, except for colour, odour, appearance discharge from combi tap, or temperature softened water 3 Fluids representing a slight health risk and aren’t suitable to be drunk Primary water, bath and shower water 4 Fluids representing a significant health risk, containing toxic Microorganisms, pesticides, washing substances machines, dishwashers 5 Fluids representing a severe/ serious health risk, containing Urinal, sink, WC, bidets, grey water, medical pathogenic organisms, radioactive, rooms, laboratories, faecal abattoirs BACK FLOW WHEN WATER IS ALLOWED TO FLOW IN THE OPPOSITE DIRECTION TO WHICH IT IS DESIGNED TO TRAVEL. IN SOME CIRCUMSTANCES THIS WILL ALLOW CONTAMINATION TO OCCUR AND HAS TO BE PREVENTED. BACK SYPHONAGE WHEN WATER IS DRAWN BACK OUT OF AN APPLIANCE DUE TO NEGATIVE PRESSURE (SUCKING). IN SOME CIRCUMSTANCES THIS WILL ALLOW CONTAMINATION TO OCCUR AND HAS TO BE PREVENTED. BACK FLOW AND SYPHONAGE A CUSTOMER WOULD NOT WANT: DIRTY BATH WATER TO BE DRAWN INTO THE KITCHEN TAP WC WATER TO BE DRAWN INTO THE BATH TAPS OUTSIDE TAP TO BE DRAWN INTO THE CWSC THIS MEANS THE PROPER PROTECTION IS A LEGAL REQUIREMENT, TO BE INSTALLED BY THE PLUMBER. PROTECTING CATEGORY 1 WATER FROM 2 (EG WHOLESOME WATER FROM HOT WATER OR CWSC) IN THIS CASE A SINGLE CHECK VALVE OR NON- RETURN VALVE MUST BE INSTALLED PRIOR TO THE OUTLET. THESE WOULD BE USED UNDER A MIXER TAP, OR SHOWER MIXER VALVE. PROTECTING CATEGORY 1 WATER FROM 2 SINGLE CHECK VALVE PROTECTING CATEGORY 1 WATER FROM 3 (EG WHOLESOME WATER FROM FILLING LOOP ON COMBI BOILER) IN THIS CASE A DOUBLE CHECK VALVE OR DOUBLE NON-RETURN VALVE MUST BE INSTALLED PRIOR TO THE OUTLET PROTECTING THE WHOLESOME WATER. THESE WOULD BE USED UNDER A SINK WITH NO AIR GAP, ON A FILLING LOOP FOR A HEATING SYSTEM OR ON AN OUTSIDE TAP. PROTECTING CATEGORY 1 WATER FROM 3 Tap outlet is below spillover level of basin Tap outlet could come into contact with contaminated water PROTECTING CATEGORY 1 WATER FROM 4 THIS SITUATION IS RARE IN A DOMESTIC HOME BUT CAN SOMETIMES BE FOUND IF THE HOUSE HAS A SWIMMING POOL AND THE CHLORINATED WATER MUST NOT CONTAMINATE THE WHOLESOME WATER. IN THIS CASE, AN RPZ VALVE MUST BE INSTALLED. PROTECTING CATEGORY 1 WATER FROM 5 (EG WHOLESOME WATER FROM FOUL WATER) IN THIS CASE AN AIR GAP MUST BE MAINTAINED TO PREVENT ANY CONTAMINATION. THESE AIR GAPS ARE FOUND IN: CWSC WC CISTERNS BASINS BATHS SINKS SHOWER HOSES  AIR GAPS AUK1 OR AG THE AUK1 IS THE HEIGHT FROM THE WC PAN SPILLOVER TO THE CISTERN SPILLOVER (300MM). THE AG IS THE HEIGHT FROM THE WARNING PIPE TO THE FOV OUTLET (25MM).  AUK2 THIS AIR GAP IS THE DISTANCE BETWEEN THE OUTLET OF THE TAP AND THE SPILLOVER LEVEL OF A BATH OR BASIN, OR OVER THE RIM OF A BIDET. AUK2  AUK3 THIS AIR GAP IS THE DISTANCE BETWEEN THE OUTLET OF A TAP AND THE SPILLOVER LEVEL ON A SINK. AUK3  AIR GAPS FLEXIBLE SHOWER HOSES MUST ALSO BE RESTRICTED FROM BEING SUBMERGED IN BATHWATER BY THE USE OF A SHOWER RAIL, WITH A RUBBER RESTRAINER FOR THE HOSE THAT IS VERY IMPORTANT.  THE WATER REGULATIONS PROTECTING THE PIPEWORK FROM FREEZING, AND PROTECTING THE PIPEWORK FROM UNDUE HEAT, ARE COVERED IN THE WATER REGULATIONS AND BS EN 806. ONE OF THE FIVE MAIN AREAS OF THE WATER REGULATIONS IS TO PROTECT WHOLESOME WATER FROM CONTAMINATION. THE CORRECT USE AND POSITIONING OF BACKFLOW DEVICES IS IMPORTANT TO A PLUMBER. CHECK YOUR KNOWLEDGE WITH THESE QUESTIONS 1. WHAT DOES INSULATION DO? 2. WHAT IS BACKFLOW? 3. WHAT IS BACK SIPHONAGE? 4. HOW CAN YOU PROTECT CAT ONE FROM CAT2? 5. WHAT DOES AUK2 COVER? 6. WHAT DOES AUK3 COVER?  TRAFFIC LIGHT IT: WHERE IS YOUR LEARNING AT? Red = I have not really understood the content we have studied today (write down 2 questions that you need help with) Amber = I have understood the content on Effective Questioning (write down 1 one question you need to clarify) Green = I have understood all the content (write down one example from what we have studied)