Emergency water injection design for liquefied hydrocarbon storage tanks
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Experts, the regulations require that liquefied hydrocarbon storage tanks be equipped with emergency water injection facilities, but they do not mandate the use of separate emergency water injection pumps. I would like to ask whether this emergency injection pump is mandatory to be installed, or whether it is sufficient to have just a quick-connect interface. Are there any other regulatory requirements? I appreciate your guidance, thank you!
1. If the water pressure in the pipeline network is sufficient to fill the spherical tank, there is no need to add a booster pump； 2. There must be safety measures to prevent the material in the spherical tank from flowing back into the fire-fighting water ； 3. It can be put into use quickly in emergency situations without the need for on-site operation. Personal opinion~
No, the water injection mode can be fixed or semi-fixed; for the semi-fixed mode, there is no need to install a water pump
The necessity of installing a separate water injection pump depends on whether the water pressure available to you meets the pressure required in case of an emergency in the liquefied hydrocarbon tank.
Currently, there are no specific design requirements specified in the GB standards; it is recommended to consider adding one on the inlet pipeline of the circulation pump (to prevent insufficient water injection pressure or other abnormalities)； However, measures to prevent internal leakage and cross-contamination of materials, as well as subsequent alarm functions, are required.
A water injection pump is not necessary. Whether to install a injection pump depends on the operating pressure of the spherical tank; if the operating pressure is higher than the fire water pressure, then a pump is necessary, otherwise not
Clause 7.4 of SH3136-2003 Safety Design Code for Spherical Storage Tanks of Liquefied Hydrocarbons contains provisions regarding water injection
The water injection pipes for liquefied hydrocarbon equipment should be installed using a semi-fixed connection method. The first flange at the bottom of the liquefied hydrocarbon equipment (spherical tank) is most likely to leak. To prevent material leakage, water injection pipes are generally installed to force water into the tank. Since the density of water is greater than that of liquefied hydrocarbons, in the event of a leak at the bottom of the tank, water injected into it will leak out first. To buy time, a large amount of water is required for injection; using a semi-fixed connection method allows access to the water supply from the fire suppression system at any time. Semi-fixed connection ends are generally equipped with a dual-valve system: the first valve is a ball valve that can be opened quickly, while the second valve is a check valve designed to prevent material leakage and backflow.