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Annex 6. Una anàlisi descriptiva de la relació entre les variables. Pregunta 5
PART G : WATER CONSUMPTION METERING
G.1 METERING G.1.1 General
a. Water supplies provided by Individual Licensee to all type of premises and areas shall be metered. The type and size of meter shall be determined by the WDL.
b. All supplies to fire hydrants and other fire fighting devices installed within a consumer’s premise or within a premise compound shall be separately metered.
c. For high rise residential buildings and gated communities, water shall be supplied through bulk meters which measures the total volume of water abstracted from the public mains, including water consumed at individual parcels which is accounted for by parcel meters.
d. Individual metering shall be carried out for all multi-unit residential premises.
However, the developer/Management Corporation shall sign an agreement with the WDL confirming that the developer/Management Corporation will operate and maintain the water supply system located downstream of the bulk meter, including storage and suction cisterns as required by the Commission, and shall pay for water supplies based on the difference between bulk meter consumption readings and the sum of water delivered to each residential unit as measured by individual parcel meters supplied by the WDL (Refer to Rules 83, 84, 85, 86 and 87 of the Water Services Industry (Water Reticulation and Plumbing) Rules 2014).
e. For higher accuracy, and the need to transmit the flow data in electronic format, electro-magnetic meters may be used in lieu of the mechanical meter. The accuracy of the electro-magnetic meters at maximum flow, nominal flow and minimum flow shall comply with the requirements of BS EN 14154-1:2005 and ISO 4064:2005.
f. All meters shall be supplied and fixed by and remain the property of the water distribution licensee.
g. The consumer shall be solely responsible for the safe custody of the meter or meters which are sited within the boundary of the consumer’s property and are fixed on the service water pipe or pipes supplying water to his premise.
G.2 LOCATION OF METERS
a. The location of a meter shall be determined by the WDL.
b. The meter shall be installed in such a position that it should be unobstructive and can be easily accessible for meter installation, meter reading, maintenance and for meter disconnections (Refer to Rules 73 and 74 of the Water Services Industry (Water Reticulation and Plumbing) Rules 2014).
c. For shop houses and walk-up flats not further than 15 metres high, and where consumers are served by individual storage cisterns, meters registering water consumption by each consumer shall be installed at the ground floor, and arranged in stacks which clearly demarcates the floor level served. Individual meters will have attached address plates.
d. All bulk meters for apartments, flats, factories, condominiums and schools shall preferably be placed within the fenced compound area, and close to the guardhouse or entrance gate, or any other location as determined by the WDL.
e. Meters shall be centrally placed at each floor of a high rise building, or in front of individual parcels at locations which are easy to install, access, read and disconnect a meter. A meter should preferably be installed in a box recessed into the wall and shall not be positioned at the corridor in a manner that will affect movement along the corridors.
g. For meters placed in shafts, or boxed in chambers, sufficient natural light must be available for ease of reading. Alternatively, electrical lighting shall be provided.
G.3 SIZE OF METERS
The recommended criteria for selection of mechanical water meters are described in Table G.1 below.
Table G.1: Criteria for selection of water meters
Reference Meter Size (mm)
G.4 AUTOMATIC METER READING SYSTEM (AMR)
a. The WDL may at its own discretion implement an AMR at premises. The use of AMR provides enhanced security, privacy, accuracy and timeliness in meter reading.
b. The WDL shall inform the developer during the design stage of any development of its intention to implement AMRs for the developer.
c. Developers shall ensure that all necessary provisions be allowed for in the development to facilitate installation of AMRs.
G.5 METER/SUB-METER STANDS G.5.1 General
a. This section covers information on the dimensions and various material requirements for water meter / sub-meter stands connected to a public main.
b. Materials for meter / sub-meter stand shall be of stainless steel or rigid composite metallic pipe materials.
c. For each individual meter / sub-meter stand at high rise residential buildings, the meter shall be arranged in correct order and marked as per the requirements of WDL.
d. Meters in scripted with a symbol indicating upward flow of water are allowed to be placed vertically. Such meters shall be installed a minimum of 1.2m to 1.5m above the ground level.
e. Individual meters may be installed in a vertical position at high-rise residential buildings provided that the meters are designed for vertical installation and for ease of reading. The number of vertical meters that can be stacked one over the other shall be limited to five (5) numbers only.
f. Minimum size of meter shall be 15mm diameter.
g. Gap between meter / sub-meter stands shall be not less than 150mm.
h. A stop valve shall be placed immediately upstream of the meter.
i. A lockable stop valve may be installed by the WDL upstream of the meter.
j. Typical configuration of meter / sub-meter stands for single and multi-meters (up to 5 water meters) are as shown in the Standard Drawing Nos.
SPAN/WS/STD/F/031 and SPAN/WS/STD/F/033, and Standard Drawing Nos. SPAN/WS/STD/F/032 and 034 respectively. Typical meter stands for pipe sizes from 80mm to 200mm is depicted in Drawing No. SPAN/WS/
STD/F/022.
k. Meter / sub-meter stands should comprise the following components:-i. Stainless steel / approved composite metallic pipe material.
ii. Outgoing pipe of 20mm or 25mm ID (depending on design).
iii. Incoming pipes of 20mm ID for one-meter stands.
iv. Incoming pipes of 25mm ID for two-meter stands.
v. Incoming pipes of 50mm ID for three to five meter stands.
vi. Stop valve or ball valve (full bore) for two to five meter stands..
vii. If required backflow preventers shall be located a distance of at least 10 times the diameter of the service pipe downstream of meters installed in premises specified in the Water Services Industry (Water Reticulation and Plumbing) Rules 2014 [Refer Rule 40, Table 1].
viii. All nipples, couplings, elbows, jam nuts, tees etc. shall be of stainless steel.
ix. Saddles and ferrules shall be installed to tap water from the public mains.
x. All meter stands shall be anchored into a minimum 600mm x 300mm concrete slab reinforced with BRC of thickness not less than 50mm.
l. Other jointing combinations for single and multi-meter / sub-meter stands are as shown in the Standard Drawings (SPAN/WS/STD/028 and SPAN/WS/STD/030).
G.5.2 Markings for Meter/Sub-Meter Stands
No markings are required for single meter / sub-meter stands. For two or more meter / sub-meter stands, identification markings of the unit number shall be provided in an engraved stainless steel plate permanently mounted on the wall, or otherwise be clearly painted on both sides of the meter / sub-meter stand itself, as per the requirements of the WDL.