EASTERN CAPE -
NELSON MANDELA METRO - REQUIREMENTS FOR GAS GEYSERS
SANS 10252-1: 2018 states :
18.104.22.168 Gas operated water heaters shall comply with SANS 1808-24 and SANS 1539
22.214.171.124 Hot and cold water delivery pressure, the various components of the system shall be so installed that the hot and cold water delivery pressure to water mixing components is balanced. The residual dynamic pressure at the fittings shall not vary by more than 20 %. This requires that the layout and the pipe sizes shall be correctly calculated in terms of SANS 10252-1 to ensure the correct flow pressures taking into account simultaneous uses of other draw-off points on those lines.
7.5 Hot water generation and distribution
NOTE 2 Apart from other considerations, a detailed cost-benefit analysis should be carried out, when appropriate, in order to select the most suitable hot water generating plant and distribution system. All relevant factors should be considered, including the following: a) the hot water demand, usage patterns, and usage requirements; b) the layout of the hot water installation; c) available heat sources, and energy operating costs; and d) capital expenditure, maintenance and long-term running costs.
126.96.36.199 In most cases, the instantaneous water heating process is triggered by a differential pressure switch and orifice restrictor. This causes higher downstream hot water flow pressure drops than storage water heaters. Therefore pipe design, pipe sizing, and simultaneous use of terminal fittings shall be carefully considered and calculated to ensure sufficient hot water and balanced hot and cold water pressure at terminal fittings.
188.8.131.52 The installation of gas-operated water heaters shall comply with SANS 10087-1 for LP gas and with SANS 827 for natural gas. All gas installations shall be installed by a registered gas practitioner as required by the relevant national legislation (see foreword). After commissioning, a certificate of compliance shall be issued.
E.3.2.1 General Instantaneous water heaters heat and deliver water on demand. These heaters are often used where a supplementary hot water supply is required, for example, at a single outlet in a position remote from the main hot water system. The advantage of an instantaneous heater is the fact that it is compact and does not waste energy in keeping stored water hot. Two types of instantaneous heaters are described in E.3.2.2 and E.3.2.3.
SANS 10254 : 2017, which would also apply to storage type gas water heaters, states :
4.3.3 The various components of the system shall be so installed that the hot and cold water delivery pressure to water mixing components are balanced. The residual dynamic pressure at the fittings shall not vary by more than 20% This requires that the layout and the pipe sizes shall be correctly calculated in terms of SANS 10252-1:2018
PLEASE ENSURE THAT THE SPECIFICATION OF GAS GEYSER AND INSTALLATION COMPLY WITH THE ABOVE TO GET PLANS APPROVED.
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