building engineering services association specification for: Domestic Heating

Transcription

1 building engineering services association specification for: Domestic central Heating installation

2 building engineering services association acknowledgments Guide to good practice: Domestic central Heating installation the Besa wishes to record its sincere thanks to the following members of the drafting sub-committee, without whose direct input of knowledge, time and experience this publication would not have been produced. Bob mansfield ted rheams steve curtis ian Beard Paul Haddlesey - author graeme craig alan Keating secretary the Besa also wishes to acknowledge the input from Bsria, cibse, iop, oftec, energy saving trust, the Besa technical committee and other groups for their time, input and vetting. isbn First published 2004 by the Heating and Ventilating contractors association 2004 Besa besa Publications old mansion House eamont Bridge Penrith ca10 2BX [email protected].

3 building engineering services association Foreword Guide to good practice: Domestic central Heating installation When the Domestic Heating Design guide was first conceived in 1993 by a small technical committee from the then Home Heating group they had no idea that this recently updated guide would become the industry standard when designing heating and hot water systems. From the smallest dwelling up to and including semi-commercial installations, the design guide gives precise, easy to follow instructions on all aspects to be considered, allowing you to give your customer the best possible quotation for the installation. it was only natural therefore that following on this success it was not enough knowing how to design the system; we needed a standard on how to install it correctly. again with the expertise we have within the group and the technical department of the association, a specification has been drawn up on the installation of central heating water systems in residential dwellings and non-domestic buildings, of a residential nature. together with the Design guide this will provide a valuable tool for both the members and their clients, giving greater customer satisfaction and resulting in improved productivity and performance. raising the standards within our industry has always been one of the most important goals of the association and i firmly believe that members of the Heating and Plumbing services group now have the toolkit to do that professionally. i would like to express my personal thanks for all of the hard work, time and effort given by both members and staff of the association in producing these guides and the efforts by our industry in continually improving its standards. Bob mansfield, Former chairman, Heating and Plumbing services group Building engineering services association

4 CONTENTS Section INTRODUCTION OBJECTIVE DESIGN STANDARD OF WORKMANSHIP SCOPE PUBLICATION AND REVIEW DESCRIPTION OF HEATING SERVICES OPERATING CONDITION DESCRIPTION OF WATER SERVICES 10 Section 2 WET CENTRAL HEATING DESCRIPTION OF SERVICE Operating Condition Open Systems Sealed Systems Gravity Systems Fully Pumped Systems Under Floor Heating Solar Heating BOILERS Boiler Selection Regular/Standard Boiler Combination Boiler Condensing Boiler Condensing Combination Boiler Solid Fuel Gravity Boiler Electric Boiler Combined Heating and Power FLUE TYPES PUMPS AND CIRCUITS Circulator Pumps Circuits and Zones SYSTEM CONTROLS Time Switch Full Programmer Optimiser Weather Compensator Boiler Energy Manager Boiler Interlock Room Thermostat/Sensor Night Set-back Frost Thermostat Cylinder Thermostat Pipe Thermostat Thermostatic Hot Water Limit Valve Thermostatic Hot Water Mixing Valve Radio Frequency Controls 30 4

5 2.6 THERMOSTATIC RADIATOR VALVES AUTOMATIC BYPASS VALVE HEAT EMITTERS 32 Section 3 HOT WATER SERVICE DESCRIPTION OF SERVICE Hot Water Service from Combi Boilers Combined Primary Storage Units Solar Water Heating BOOSTED SUPPLIES Booster Pumps PRESSURISED SUPPLIES Unvented Storage 42 Section 4 COLD WATER SERVICE DESCRIPTION OF SERVICE PRESSURE BOOSTER PUMP SETS Booster Pumps 45 Section FUELS NATURAL GAS OIL SOLID SOLAR COMBINED HEATING AND POWER LIQUEFIED PETROLEUM GAS 47 Section 6 PIPEWORK UNDER FLOORS 49 Section 7 MATERIALS AND JOINTING METHODS PIPING MATERIALS SELECTION TABLES STEEL PIPE JOINTING Threaded Welded Flanged Grooved Press Fit COPPER PIPE JOINTING Compression Capillary PUSH FIT JOINTING PRESS FIT JOINTING PROPRIETARY SYSTEMS JOINTING 54 Section 8 COPPER PIPEWORK CONSTRUCTION AND ASSEMBLY PIPING MATERIALS Grades and Types Finish COMPRESSION JOINT AND FITTING ASSEMBLY Compression Method 55 5

6 8.2.2 Compression Fittings CAPILLARY JOINT AND FITTING ASSEMBLY Capillary Method of Assembly Capillary Fittings PUSH FIT ASSEMBLY Push Fit Method Push Fit Fittings PRESS FIT ASSEMBLY Press Fit Method Press Fit Fitting PULLED BENDS SUPPORT AND FIXINGS EXPANSION AND CONTRACTION Natural Flexibility Expansion Devices Anchors and Guides Cold Draw 58 Section 9 PLASTIC PIPEWORK CONSTRUCTION AND ASSEMBLY INTRODUCTION APPLICATION SELECTION TABLE JOINTING METHODS SELECTION Threaded Solvent Welding Compression Fittings Push-Fit Press Fit ELECTRICAL CONDUCTIVITY EXPANSION AND CONTRACTION RATES SUPPORTS ULTRA-VIOLET LIGHT MIXING OF PIPES AND FITTINGS PRESSURE FLUCTUATION PRESSURE AND TEMPERATURE RELATIONSHIP LOCATION OF PIPEWORK HIDDEN PIPEWORK CHEMICAL CLEANING HANDLING PLASTIC PIPEWORK AND HEATING SYSTEMS IDENTIFICATION 64 Section 10 STEEL PIPEWORK CONSTRUCTION AND ASSEMBLY PIPING MATERIAL DETAILS Pipe Finish THREADED ASSEMBLY Threaded Joints Bends and Fittings WELDED ASSEMBLY Welding Methods Welding Fittings FLANGED ASSEMBLY 66 6

7 10.5 GROOVED ASSEMBLY PRESS FIT ASSEMBLY SUPPORT AND FIXINGS EXPANSION AND CONTRACTION Natural Flexibility Expansion Devices Anchors and Guides Cold Draw 68 Section 11 STAINLESS STEEL PIPEWORK CONSTRUCTION AND ASSEMBLY 69 Section 12 GENERAL REQUIREMENTS CONSTRUCTION AND ASSEMBLY MAIN EQUIPOTENTIAL BONDING DRAINING VENTING EXPANSION AND CONTRACTION PROTECTION Physical Corrosion CONNECTIONS TO EQUIPMENT Connections to Existing Connections for Future Extensions Pipe Freezing EXTERNAL FABRIC PENETRATIONS CONSTRUCTION AND ASSEMBLY PROCEDURES Cleanliness Pipe Sleeves Alignment Spacing and Clearances 73 Section 13 ACCESSORIES AND PIPELINE ANCILLARIES GENERAL REQUIREMENTS VALVE LOCATIONS AND FUNCTION Isolating Valves Regulating Valves PIPELINE ANCILLARIES Safety Valves Ball Float Valves Non-return Valves Strainers Instrumentation and Test Points Pressure Gauges Thermometers IDENTIFICATION Pipelines Valves and Plant 76 Section 14 TESTING - HYDRAULIC 77 Section 15 THERMAL INSULATION APPLICATION Installation Considerations 79 7

8 Workmanship TRACE HEATING Pre-installation Guidelines Installation Heating Cable Connection Heating Cable Testing 81 Section 16 FLUSHING, CLEANING AND WATER TREATMENT APPLICATION SYSTEM CLEANLINESS Introduction Delivery and Storage During Installation During Testing Dynamic Flushing Water Velocity Flushing Existing Systems FILLING SYSTEM CHEMICAL CLEANING Power Flush WATER TREATMENT 86 Section 17 COMMISSIONING AND HAND OVER APPLICATION ORGANISATION AND MANAGEMENT ACTIVITIES Documentation Prior to Commissioning Pre-commissioning Cleaning Static Commissioning Checks Dynamic Commissioning Procedures CIBSE/BSRIA CODES AND OTHER PUBLISHED PROCEDURES Boiler Plant OPERATION AND MAINTENANCE MANUALS RECORD DRAWINGS 91 Section 18 BIBLIOGRAPHY AND SOURCES REFERENCES ABBREVIATIONS MISCELLANEOUS 96 8