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S2 SYSTEM DESCRIPTIONS SECTION CONTENTS

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									                    SYSTEM DESCRIPTIONS


                      SECTION CONTENTS

       TITLE                                                 PAGE

2.1    INTRODUCTION                                              1
2.2    DESCRIPTION OF BUILDING                                   2
2.3    INCOMING COLD WATER MAIN SUPPLY                           3
2.4    COLD WATER SUPPLIES                                       4
2.5    ELECTRIC TRACE HEATING                                    5
2.6    DOMESTIC HOT WATER SERVICE                                6
2.7    NATURAL GAS SUPPLY                                        8
2.8    LOW TEMPERATURE HOT WATER HEATING                         9
2.9    GAS FIRED WARM AIR HEATERS                                11
2.10   DIRECT EXPANSION (DX) COMFORT COOLING                     12
2.11   BUILDING MECHANICAL VENTILATION                           13
2.12   ABOVE GROUND SANITATION                                   15
2.13   AUTOMATIC CONTROL SYSTEM                                  16




                                               ISSUE: SEPTEMBER 2009
SYSTEM DESCRIPTIONS                                                      SECTION TWO / 1


2.1   INTRODUCTION

      This Section of the Manual provides a description of the plant and system
      arrangements.

      This Section in particular will assist with an understanding of the services
      arrangements. It should be read preferably, with an inspection of the installation on
      site.

      All works were the responsibility of ROK and were carried out during 2008.

      The Works carried out under this Contract comprised the provision of:

      1.     Incoming cold water main.
      2.     Incoming natural gas supply.
      3.     Cold water storage cisterns, booster set and supply pipework installed to the
             North Side of the building.
      4.     Mains pressure domestic water system installed to the South Side of the
             building.
      5.     Heating system comprising duplicate system type gas fired boilers serving
             panel radiators and ventilation system heater batteries within the North Side
             of the building.
      6.     Heating system comprising a combination type gas fired boiler serving
             panel radiators (and also domestic hot water tap outlets) within the South
             Side of the building.
      7.     Hot water system comprising duplicate gas fired water storage heaters
             supplying the North Side of the building.
      8.     Hot water system supplying the South Side of the building via a gas fired
             combination boiler.
      9.     Gas fired heaters in the garage area.
      10.    Heating and cooling direct expansion heat pump system in the Drug Store
             Area.
      11.    Cooling only direct expansion split system in the Comms Room.
      12.    New ventilation systems installation in the Offices, Mess Rooms, Toilets
             and Garage Space.
      13.    An automatic control system.
      14.    Above ground sanitation pipework system.




                                                                  ISSUE: SEPTEMBER 2009
SYSTEM DESCRIPTIONS                                                     SECTION TWO / 2


2.2   DESCRIPTION OF BUILDING

      The building is of steel portal frame, located at 8A Oriana Way, Nursling Industrial
      Estate, Southampton S016 OYU.

      The exterior of the building is clad with plastisol coated profile steel sheets, has
      low level brickwork, and incorporates windows, doors and 3 roller shutter doors.

      The internal walls are formed in blockwork.

      The building incorporates Crew Mess Facilities, Toilets and Showers, Stores
      Areas, Workshop Area, Training Area and Ambulance/Car Parking facilities.




                                                                  ISSUE: SEPTEMBER 2009
SYSTEM DESCRIPTIONS                                                     SECTION TWO / 3


2.3   INCOMING COLD WATER MAIN SUPPLY

      A new cold water supply main has been run from the existing stop valve adjacent
      to the entrance door to connect to the duplicate cold water storage cisterns on the
      North Side of the Building and to the combination boiler, sinks, shower, basins and
      WCs on the South Side of the Building.

      The supply also serves an external cold water tap located adjacent to the wash
      down area for connection to a vehicle pressure washer. The supply pipework is
      fitted with an isolation valve and a double check valve installed in the building.
      The external pipework is trace heated using a Tyco Raychem type FS-B-2X Frost
      Protection System.

      A water conditioner has been installed in the new cold water supply main after the
      stop valve. This is a ‘SESI’ electrostatic type conditioning unit, manufactured by
      Salamander Engineering.

      All pipework has been installed in copper to EN1057-R250 with soldered capillary
      type joints having integral lead free solder rings.

      Quarter turn servicing valves have been fitted at each outlet.




                                                                   ISSUE: SEPTEMBER 2009
SYSTEM DESCRIPTIONS                                                     SECTION TWO / 4


2.4   COLD WATER SUPPLIES

      Two separate domestic water systems are provided to serve the Building. The
      North Side is served by a boosted water supply, via duplicate cold water storage
      cisterns and the South Side by a direct off mains supply system, incorporating a gas
      fired combination boiler.

      The North Side boosted water supply plant comprises:

            Two pre-insulated glass reinforced plastic (grp) break cistern with inlet
             float operated valves
            A three pump water booster arrangement providing duty, assist and standby
             operation
            An accumulator vessel

      The water booster plant is located within the First Floor Plant Room.

      The booster pump set is automatic in operation at the dictates of the water outlets
      opening and operates at a nominal pressure of 2 bar. The booster pump set is a
      Grundfos type CHI 12-20.

      Each cistern is provided with a float operated valve, vent, overflow / warning pipe,
      drain off / flushing valve and a valved outlet connecting to a common header.

      Each cistern can be individually hydraulically isolated and drained to facilitate
      maintenance. It must be ensured that the cisterns are only drained for a minimum
      period of time to reduce the risk of seals failing.

      The general boosted cold water supply system serves:

            Shower cold water supplies
            Wash hand basin cold water supplies
            WC cisterns
            Urinals
            All drinking water outlets
            Kitchen sink cold water supplies
            Kitchen appliances cold water supplies
            Wash Down area outlet
            All North Side domestic hot water outlets via duplicate gas fired water
             heaters

      All pipework is installed in copper to EN1057-R250 with soldered capillary type
      fittings with integral lead free solder rings.

      Quarter turn servicing valves have been fitted at each outlet.

      Reference in particular should be made to Record Drawings 06/1370/M01,
      ‘Ground and First Floor Mechanical Services Layout Hot and Cold Water’.


                                                                   ISSUE: SEPTEMBER 2009
SYSTEM DESCRIPTIONS                                                     SECTION TWO / 5


2.5   ELECTRIC TRACE HEATING

      Vehicle pressure wash system pipework installed externally that is at risk of frost
      damage is provided with electric trace heating.

      The trace heating elements installed on the pipework are controlled by ambient
      mounted thermostats.

      The system installed is a Tyco Raychem Frost Protection System type FS-B-2X,
      and it is provided with a permanent 230V single phase electrical supply.




                                                                 ISSUE: SEPTEMBER 2009
SYSTEM DESCRIPTIONS                                                      SECTION TWO / 6


2.6   DOMESTIC HOT WATER SERVICE

      Two separate domestic hot water systems are provided.

      The North Side of the Building is supplied from two Andrews model CHW30/200
      gas fired water heaters, via the cold water booster set.

      The South Side of the Building is supplied direct off mains via a Vaillant EcoMax
      835E combination boiler.

      The two water heaters installed in the North side of the Building are located in the
      first floor plant area, and are fitted with concentric flue/air terminals discharging
      through the outside wall of the plant area.

      The gas fired two water heaters are of the un-vented pressurised type. An
      inlet control valve set, expansion vessel, control thermostat, high temperature
      cut-out and temperature and pressure relief valve are provided for the water
      heaters to ensure correct and safe operation of the domestic hot water system.
      Never tamper, modify or remove without replacing any of these components.
      The water heaters may explode if the stored water temperature is permitted to
      exceed 100 °C and the pressure within the system is permitted to exceed the
      set safe working pressure.

      It is essential that only maintenance technicians who have been trained on the
      theory and practical aspects of un-vented systems and combustion theory and
      are listed with a suitable Registration body should operate and maintain the
      gas fired units. Operatives who maintain the gas fired units must also be
      ACOP / gas safe registered for the type of installation. Note that these are
      Legal Requirements under the Building Regulations and Gas Safety in Use
      Regulations.

      The combination boiler is installed in the South Side first floor and has a
      concentric flue/air terminal discharging through the outside wall.

      The installation of the gas fired water heaters and combination boiler meet the
      requirements of BS6644 and Guidance Note PM5 published by the Health &
      Safety Executive.

      The North side hot water supply pipework runs from the two water heaters to drop
      to outlets in the toilets, kitchens and laundry. The system has a pumped return
      circulation system to reduce dead legs. The circulation pump used is a Grundfos
      UPS15-50B. The cold water inlet is provided with a safety valve and an expansion
      vessel which was supplied with the Andrews water heaters.

      The South side hot water supply pipework runs from the combination boiler to
      drop to outlets in the toilets and kitchens.




                                                                  ISSUE: SEPTEMBER 2009
SYSTEM DESCRIPTIONS                                                        SECTION TWO / 7


      The basins within the toilets are provided with Altecnic ‘Mixcal’ thermostatic
      blending valves, to control maximum water discharge temperatures to reduce the
      risk of scalding.

      The showers within the Male and Female changing rooms have each been provided
      with a group temperature control valve manufactured by Rada Controls, type 320C.
      The delivery from this valve is set at 43°C, and the setting adjustment is concealed
      from general access. At each shower position a Rada shower rose type 310R is
      provided at a fixed level. These operate using Rada TF31 timed flow controllers.

      In the case of each single shower, individual control has been provided with a Rada
      TF31 timed flow controller, operating in conjunction with a Rada type 320C
      thermostatic mixing valve and a shower rose type 310R.

      Hot water is distributed through EN1057-R250 copper pipework to sinks, basins
      and showers. All domestic hot water flow and return pipework, with the exception
      of final connections, is thermally insulated to reduce condensation and heat loss.

      Drain cocks have been installed at the low points in all parts of the installation, and
      quarter turn servicing valves are fitted at each outlet.

      Reference in particular should be made to Record Drawing 06/1370/M01, ‘Ground
      and First Floor Mechanical Services Layout Hot and Cold Water’.




                                                                    ISSUE: SEPTEMBER 2009
SYSTEM DESCRIPTIONS                                                     SECTION TWO / 8


2.7   NATURAL GAS SUPPLY

      An existing single incoming gas service is provided to the Building.

      A new gas supply main has been run from the existing meter to connect to the
      water heaters and boilers serving the North Side of the building, the boiler serving
      the south side of the building and the gas fired warm air heaters.

      The gas installation complies with the Gas Safety in Use Regulations throughout,
      and the gas services have been installed in mild steel tube to BS1387 medium
      gauge using malleable iron fittings to BS965.

      After completion of the gas installation it was pressure tested in accordance with
      British Gas publication IM/2 and IM/5. All exposed pipework has been painted
      yellow ochre for identification purposes.

      The gas meter enclosure has been fitted with two air bricks through the external
      wall, one at low level and one at higher level to provide a suitable level of
      ventilation.

      An automatic solenoid operated shut off valve is installed in the main gas supply.
      This is connected to the fire alarm system, and is designed to shut off the gas
      supply to the building automatically in a fire alarm situation.




                                                                  ISSUE: SEPTEMBER 2009
SYSTEM DESCRIPTIONS                                                      SECTION TWO / 9


2.8   LOW TEMPERATURE HOT WATER HEATING

      Two Low Temperature Hot Water (LTHW) Heating Systems have been installed
      within the building.

      The LTHW system installed in the North Side of the building comprises:

         Duplicate Vaillant balanced flue, gas fired, condensing ‘system’ boilers,
          incorporating an integral heating circulation pump, automatic bypass valve,
          expansion vessel, integral control system and automatic air vent
         An additional secondary heating circulation pump installed within the heating
          pipework distribution system, to distribute water from the boiler header to the
          radiators and heater batteries
         An additional expansion vessel connected to the heating pipework
         An automatic microprocessor controlled Mikrofill heating system fill unit
         A two pipe, flow and return, heating pipework distribution system serving
          radiators and ventilation system heater batteries
         Radiator heat emitters

      The secondary pump is a twin head (duty and standby) glandless Grundfos UPSD
      40-50 pump. The LTHW circuit is fitted with a bypass balancing valve, pressure
      relief valve and regulating valves.

      The low temperature hot water system is maintained at operating pressure by a
      Mikrofill EFD heating fill unit in conjunction with a Flamco Flexcon 25/05 floor
      mounted expansion vessel. The system is filled and automatically topped up by the
      Mikrofill EFD unit.

      The automatic heating system fill unit is fed from the cold water main supply. The
      fill unit incorporates integral backflow prevention devices to reduce the risk of the
      heating system water contaminating the cold water supply. The fill unit is provided
      with a high water pressure and low water pressure alarm, with audible and visual
      indication. A manually operated mute button is provided which will de-activate
      the audible alarm. The alarm systems provide warning should the heating system
      water pressures fall outside set parameters and will also deactivate the boiler and
      pumps.

      The LTHW system installed in the South Side of the building incorporates a
      Vaillant EcoMax 835E combination boiler with integral circulation pump. The
      system is filled from the cold water main via a fill loop.

      Each boiler is provided with a purpose designed flue system which terminates
      through the external wall.




                                                                  ISSUE: SEPTEMBER 2009
SYSTEM DESCRIPTIONS                                                    SECTION TWO / 10


      The boilers are of the high-efficiency, condensing type. It can be expected that a
      plume (dense mist discharge) will occur from the flue discharge at times,
      particularly at times of low ambient temperature. This is quite normal for this type
      boiler.

      Due to the high-efficiency of the boilers, condensation will occur from the flue
      gases. A PVCu condensate drain is therefore provided from each boiler and also
      the from the flue to collect and discharge the condensate safely into the above
      ground sanitation system.

      Each boiler is provided with a safety pressure relief valve. A discharge pipe is
      provided from each valve, terminating through the external wall.

      Each boiler is provided with a natural gas supply to provide the primary heat
      source.

      A two pipe, heating flow and return system is provided from each boiler system to
      feed the radiator heat emitters. The North Side boilers also serves a ventilation
      system heater battery.

      All the radiators are from the Stelrad Elite range, and fitted with a Drayton TRV-4
      angle body thermostatic radiator valve to maintain a room temperature nominally at
      20°C ± 2°C (these are adjustable). Each radiator is also fitted with a Peglers
      Terrier chromium plated angle body lockshield valve on the return connection.

      All the LTHW pipework is mild steel tube to BS1387 medium gauge using
      malleable iron fittings to BS965 throughout.

      All the pipework is insulated with Armaflex thermal insulation with taped joints
      and flow/service identification bands.

      The LTHW system is dosed (using the dosing pot provided) with a suitable
      concentration of Chemical Inhibitor (Fernox CH-3) to meet the requirements of
      CIBSE Guide CW.




                                                                  ISSUE: SEPTEMBER 2009
SYSTEM DESCRIPTIONS                                                   SECTION TWO / 11


2.9   GAS FIRED WARM AIR HEATERS

      All gas fired warm air heaters were manufactured by Powrmatic Ltd.

      An existing standalone CA-G 600 HF gas fired warm air heater has been retained
      and is provided at high level on the garage area east external wall.

      Two new standalone gas heater units have been installed on the garage area west
      external wall.

      A further new heater has been provided in the central store area. This is provided
      with a circular supply air ductwork distribution system to provide heating to the
      areas between the vehicle lifts.

      Reference in particular should be made to Record Drawings 06/1370/M02,
      ‘Ground Floor Mechanical Services Layout Heating and Ventilation’ and
      06/1370/M03, ‘First Floor Mechanical Services Layout Heating and Ventilation’.




                                                                ISSUE: SEPTEMBER 2009
SYSTEM DESCRIPTIONS                                                      SECTION TWO / 12


2.10   DIRECT EXPANSION (DX) COMFORT COOLING

       Two new comfort cooling systems have been installed within the Building by a
       specialist subcontractor, Space Air Conditioning Ltd., as follows:

             Ground Floor Drug Store: A Daikin heat pump based heating and cooling
              system connected to an outdoor unit has been installed. The heat pump
              system uses refrigerant type R410A. The indoor unit is a 4-way blow
              cassette unit mounted in the suspended ceiling.

             Comms Room: A Daikin wall mounted cooling only unit is installed, which
              is connected to an outdoor unit installed in the entrance area. The split
              cooling system uses refrigerant type R410A.

       Each indoor unit incorporates condensate discharge pipework. The condensate
       pipework is installed in copper to EN1057-R250, to which the flexible condensate
       outlet from each unit has been connected.

       The condensate pipework has been insulated in Class 0 ‘Armaflex’ thermal
       insulation. All the refrigeration pipework is installed using refrigerant grade solid
       drawn copper tubing installed on medium return cable tray, and is also insulated in
       Class 0 ‘Armaflex’.

       Condensate from the fan coil units discharges into the above ground rainwater
       disposal stacks.

       The individual fan coil units are controlled via local wall mounted user adjustable
       controllers. These controllers can be set to provide time scheduled operation,
       cassette unit fan speed control and control temperature set points.




                                                                   ISSUE: SEPTEMBER 2009
SYSTEM DESCRIPTIONS                                                       SECTION TWO / 13


2.11   BUILDING MECHANICAL VENTILATION

       The TV Lounge, Conference Room, Locker Room, Drying Room and First Floor
       Office Areas on the North Side of the Building are ventilated by a supply and
       extract system. The systems consist of a VES Andover Ecovent 427 unit providing
       supply and extract air via a ductwork distribution system.

       The supply and extract system connects to ceiling mounted supply and extract
       grilles.

       The Ecovent unit is complete with integral heat exchanger, filter and low
       temperature hot water heater battery. It is provided with a speed controller installed
       in the motor control panel to provide the required airflow at each grille.

       The air handling units comprise:

             A supply air inlet motorised damper.
             A supply air filter.
             A supply air path through a heat exchanger.
             A single supply air fan driven via an inverter speed controller.
             A LTHW heater battery.
             An extract air filter.
             An extract air path through a heat exchanger.
             A single extract air fan driven via an inverter speed controller.
             An extract air discharge motorised damper

       The Ground Floor Male and Female Toilet / Changing Rooms Areas on the North
       Side of the Building are provided with a mechanical supply and extract air system.
       This system consists of:

             A supply air fan
             An extract air fan
             A supply air filter box
             An extract / supply air heat exchanger
             Supply air electric duct heater
             Ceiling mounted supply and extract grilles
             Ductwork distribution system




                                                                    ISSUE: SEPTEMBER 2009
SYSTEM DESCRIPTIONS                                                      SECTION TWO / 14


      The supply and extract air fans are turbo mixed flow type of 315mm diameter, both
      of which are speed controlled to provide the required airflow at each grille.

      The North Side Ground Floor Laundry, South Side Ground Floor Toilets and South
      Side Changing, Mess and Office Areas, are ventilated in a similar way to the North
      Side Toilet / Changing Rooms. Each of the three areas are provided with a
      separate system comprising two turbo mixed flow fans of 200mm diameter. Supply
      and extract fans are speed controlled to provide the required air flow at each grille.

      Seven VES Andover ‘Skypod’ extract fans have installed at high level through the
      roof of the garage area on soaker flanges. Each fan is fitted with a speed controller
      to set a maximum flow rate of 3.8m3/s to achieve an overall maximum air change
      rate of 6 per hour with all fans running. The speed controllers are grouped together
      in a common control panel and installed adjacent to the entrance door.

      A localised extract fan has been installed through the external wall to ventilate the
      battery charging area. This fan is a Soler & Palau extract fan model CMB/4, fitted
      with a flameproof motor. The fan is also fitted with a local isolator.

      The two cookers in the kitchen areas are fitted with ‘Florence’ extract hoods
      manufactured by Vent-Axia Ltd. These extractors are three speed models, and have
      ductwork connected to outlet grilles fitted with back draught dampers.




                                                                   ISSUE: SEPTEMBER 2009
SYSTEM DESCRIPTIONS                                                        SECTION TWO / 15


2.12   ABOVE GROUND SANITATION

       A new above ground sanitation pipework system has been provided from sinks,
       basins, WCs and showers. This pipework is PVCu from the Caradon Terrain range.

       All the above ground sanitary drainage complies with BS5572 (Code of Practice
       for Sanitary Pipework).

       Wash hand basins are fitted with bottle traps, and sinks are fitted with tubular traps.
       All traps have a minimum 75mm depth of seal.

       All flushing WC cisterns have been fitted with a Seeflo Overfloat internal overflow
       warning device.

       Condense pipework is connected to drain into the nearest soil vent pipe with a run
       in trap of 75mm. This drainage pipework is in copper to EN1057-R250, and is
       insulated within the ceiling voids.

       The system discharges to the below ground drainage system, which in turn
       discharges to the Local Authorities sewers. Access points have been provided at all
       pipe junctions and bends to permit rodding. It is possible to rod through the
       complete system via these access points and also via the sanitary/services fitting
       connections.




                                                                     ISSUE: SEPTEMBER 2009
SYSTEM DESCRIPTIONS                                                     SECTION TWO / 16


2.13   AUTOMATIC CONTROL SYSTEM

       An Automatic Control is provided to generally start, stop, operate, monitor and
       control the Mechanical Engineering Services with the minimum of supervision by
       maintenance personnel.

       Motor control panels (MCP’s) were provided by a specialist sub-contractor, Javelin
       Controls.

       Two motor control panels (MCP) are provided.

       One MCP serves the North Side:

             Heating Boilers
             Heating Pumps
             Heating Fill Unit
             Gas Fired Water Heaters
             Water Booster Set
             Fresh Air Supply Air Handling Unit
             Fresh Air Extract Fan

       Hand / off / auto selector switches are provided on the control panel fascia for the
       plant items. The selector switches should normally be left in the ‘auto’ position.
       The ‘hand’ position should only be used by maintenance personnel and should only
       be used temporarily for testing purposes.

       Duplicate pumps are also provided with change over switch for duty standby
       operation.

       The supply/extract air handling unit is provided with a duct mounted temperature
       detector which controls the low temperature hot water heater valve.

       Trani-indication lamps provide visual indication of equipment operating status.

       The other MCP is located by the roller door. This serves the 7 No. VES Andover
       ‘Skypod’ extract fans in the Garage area.

       The panel controls the fans in three groups:

       A, B and C

       Each group is controlled by carbon monoxide sensors installed at key locations
       within the Garage area. The control provides Off/Low/High speed operation via a
       manual over-ride or Auto mode whereby fan speed automatically increases in steps
       proportionate to measured CO concentration.



                                                                   ISSUE: SEPTEMBER 2009
SYSTEM DESCRIPTIONS                                                    SECTION TWO / 17


      Trani-indication lamps provide visual indication of equipment operating status.

      The two DX Comfort Cooling units are wired from a local isolator and controlled
      by a local wall mounted remote control unit.

      The gas fired water heaters, gas fired warm air heaters and combination boiler are
      provided with inbuilt controllers.

      A Soler and Palau CMB/4 extract fan with flameproof motor has been installed in
      the battery charging area to extract any fume generated during battery charging
      operations. The fan is fitted with a speed controller to control the extract air
      volume.

      Reference in particular should be made to JC-0342-BV, ‘Heating Control Panel
      Wiring Diagrams’ and JC-0342-WV, ‘Extract Fans Control Panel Wiring
      Diagrams’, produced by Javlin Controls.




                                                                 ISSUE: SEPTEMBER 2009

								
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