CALOR LPG INSTALLATION mANuAL - Calor Gas

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Groundwork Supply Pipework The density of liquid phase LPG is approximately half that of water, and consequently semi-mounded LPG tanks will float if the location becomes flooded with water. Buried tanks in waterlogged ground will be subject to a flotation force of 1000kg per cubic metre of tank volume and without adequate anchoring have been known to surface, bringing the pipework with them. Back fill material should preferably be river washed sand The excavation for semi-mounded tanks needs careful planning. Excavations can have an effect on neighbouring buildings, foundations and structures. Plastic warning mesh spread over vessel approx. 200mm below finished ground level Soil Ground Level 450mm Ground Level Regulator Emergency valve Transition fitting GRP sleeve Warning tape Seal and sleeve pipe Due to the possible future effects of excavation work on foundations or structures, it is recommended that semi-mounded LPG tanks be sited wherever practical away from buildings or structures. If there is no other suitable location within the confines of the premises, the edge of the excavation should be located no closer than 2 metres to any foundation unless a geological survey is carried out by a competent person. River washed sand Anode 1000mm Ø1000mm 1 Tonne 1000mm Concrete mud mat on compressed hardcore Concrete base 100mm 1000mm 1100mm Gas supply pipe Minimum cover depth of 375mm from the finished ground level to the top of the pipe 175mm 200mm Preformed bend Detailed installation drawings can be obtained from Calor Customer Engineering Department. Semi-mounded tank siting Fig. 14. Semi-mounded tank installation detail. Property boundary Excavation for semi-mounded tanks Ground conditions can vary significantly and not all locations are suitable for underground LPG storage. As a result Calor cannot accept any responsibility for any ground work. This includes temporary or permanent earthwork support found necessary or foundations that may be required. It is recommended that a suitably qualified and experienced engineer be employed to undertake a geological site survey and provide the appropriate advice on all the ground work and foundations necessary. 3m 3m 3m 2m Due to the dangers involved with carrying out excavation work, all persons who are involved in such work, or working in them, must be suitably trained and competent. There is various legislation concerning persons working on, or in excavations. The emphasis is on an awareness of hazards and the methods adopted to eliminate or reduce the risk to an acceptable level. All excavations must be assessed by a competent person to ensure they are safe to work with, both above and below ground level. Ground work has to be properly planned and carried out to prevent accidents. Typical hazards that require guarding against are: 3m min. 2m Party fence wall • Collapse of the sides • Materials falling in whilst persons are working in the excavation • People or vehicles falling into the excavations • Underground services or installations • Undermining of nearby structures • Flooding • Exhaust gases from vehicles etc. Fig. 15. Typical domestic tank siting for a semi-mounded 1000kg tank (NTS). 21 22
Distances from buildings, boundaries and sources of ignition for buried or semi-mounded tanks Supply pipework Minimum safety distance from buildings boundaries or fixed source of ignition (m) To tank To valve assembly Distance surface between tanks (m) Tank size (kg) Without gas dispersion wall With gas dispersion wall 1000 2 * 3 1.5 1 2000 2 3 1.5 1 4000 2 3 1.5 1 Building, boundary or fixed source of ignition Gas dispersion wall 0.5m 0.82m Warning mesh Ground Level *Separation distance is stated as 1m, but due to effects of excavation on building structure, it is recommended that this distance be increased to 2m. Specialist advice should be sought on location of the excavation and its affect on the building structure/foundations. NB: Expert advice on all tank installations is available from Calor Customer Engineering Department. Ref (ROI): IS3216 2010 Code of Practice - Bulk Storage of Liquid Petroleum Gas (LPG) - (Edition 2) Ref (NI): COP1: Part: 1 2004. 1 - 2 tonne semi-mounded tank with a gas dispersion wall Fig. 17. Schematic layout of a 1000kg semi-mounded tank installation using a gas dispersion wall to reduce the required separation distance from a building. Concrete mud mat on compressed hardcore Gas dispersion wall length – to give linear distance of 3m from A to B to C 1 - 2 tonne semi-mounded: 1.5m to gas dispersion wall Site boundary, building or fixed source of ignition A B C Min 3000mm 5000mm 3000mm Concrete mud mat on compressed hardcore NTS 1 - 2 tonne semi-mounded tank GAS DISPERSION WALLS Gas dispersion walls further permit the reduction of separation distances for semi-mounded tanks. They differ from a fire wall in that they are not required to protect the tank(s) from thermal radiation from an external fire, but to ensure any potential gas escape from the valve box area can be safely dispersed or diluted before reaching an ignition source. A gas dispersion wall should be constructed of a length such that the distance measured from the valve assembly, around the wall, to the property, boundary or fixed source of ignition is not less than the separation distance required if the wall were not present. Gas dispersion walls should be impervious, substantially constructed from brick, concrete or solid masonry and should not be less than 0.5m in height. They should only be used on one side of the tank. They should not be sited as to direct or facilitate the draining of water onto the LPG tank and should not impede natural ventilation. Fig. 16. 1 - 2 tonne semi-mounded tank showing reduced separation distances due to gas dispersion wall. 23 24
Page 1 and 2: CALOR LPG INStALLATION manual LPG S
Page 3 and 4: CALOR GAS Installations CALOR GAS T
Page 5 and 6: TANK SIZING Selecting the appropria
Page 7 and 8: TANK SITING ABOVE GROUND Property b
Page 9 and 10: CALOR GAS Domestic tank and pipewor
Page 11: CALOR GAS Semi-Mounded Tank Install
Page 15 and 16: CALOR GAS Properties of Propane Min
Page 17 and 18: CONVERSION TABLES VOLUME FLOW RATE

CALOR LPG INSTALLATION mANuAL - Calor Gas

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