1) Installation requirements:
① The valves used in the foam mixture pipeline include manual, electric, pneumatic and hydraulic valves. The latter three are mostly used in large-diameter pipelines, or remote and automatic control. They have their own standards. The valves used in the foam mixture pipeline need to be For installation according to relevant standards, the valve must have obvious opening and closing signs.
②Valves with remote control and automatic control functions must be installed in accordance with the design requirements; when they are installed in an explosion and fire hazard environment, they must be in accordance with the current national standard “Electrical Installation Engineering Explosion and Fire Hazardous Environment Electrical Installation Construction and Acceptance Specification 》(GB50257-1996).
③The steel rising stem gate valve and check valve installed at the place where the foam pipeline of the submerged jet and semi-submerged jet foam fire extinguishing system enters the storage tank need to be installed horizontally, and the direction marked on the check valve must be consistent with the flow direction of the foam. Otherwise, the foam cannot enter the storage tank, but the medium in the storage tank may flow back into the pipeline, causing more accidents.
④The pressure gauge, pipe filter, and control valve installed on the foam mixed liquid pipeline at the inlet of the high-expansion foam generator should generally be installed on the horizontal branch pipe.
⑤The automatic exhaust valve set on the foam mixed liquid pipeline should be installed vertically after the system has passed the pressure test and flushing. The automatic exhaust valve set on the foam mixed liquid pipeline is a special product that can automatically discharge the gas in the pipeline. When the pipeline is filled with foam mixture (or filled with water during debugging), the gas in the pipeline will be naturally driven to the highest point or the last gathering place of the gas in the pipeline. The automatic exhaust valve can automatically discharge these gases. When the pipeline The valve will automatically close after being filled with liquid. The vertical installation of the exhaust valve is a requirement of the product structure. The installation is carried out after the system has passed the pressure test and flushing to prevent blockage and affect the exhaust.
⑥The control valve on the foam mixed liquid pipeline connected to the foam generating device should be installed outside the pressure gauge interface outside the fire dike, with obvious opening and closing signs; when the foam mixed liquid pipeline is set on the ground, the installation height of the control valve is generally controlled at Between 1.1 and 1.5m, when the cast iron control valve is used in areas where the ambient temperature is 0℃ and below, if the pipeline is installed on the ground, the cast iron control valve should be installed on the riser; if the pipeline is buried in the ground or installed in the trench, cast iron The control valve should be installed in the valve well or trench, and anti-freezing measures should be taken.
⑦When the fixed foam fire extinguishing system in the storage tank area also has the function of a semi-fixed system, it is necessary to install a pipe joint with a control valve and a stuffy cover on the foam mixed liquid pipeline outside the fire dike to facilitate fire trucks or other mobile fire fighting The equipment is connected to the fixed foam fire extinguishing equipment in the storage tank area.
⑧ The installation height of the control valve set on the foam mixed liquid riser is generally between 1.1 and 1.5m, and an obvious opening and closing mark needs to be set; when the installation height of the control valve is greater than 1.8m, an operating platform or operation needs to be set stool.
⑨The return pipe with control valve installed on the discharge pipe of the fire pump must meet the design requirements. The installation height of the control valve is generally between 0.6 and 1.2m.
⑩The vent valve on the pipeline should be installed at the lowest point to facilitate the maximum evacuation of the liquid in the pipeline.
2) Inspection method: items ① and ② are observed and inspected according to the requirements of relevant standards, and other observations and ruler inspections
Post time: Apr-12-2021