1. Problem description and cause analysis.
1 Problem Description.
When the fire extinguishing system and the wet sprinkler system share the sprinkler pump, the fire cannon supervisor is connected behind the wet alarm valve. [Figure 1].
2 Cause analysis.
1) The design drawings are incorrect, resulting in the installation error of the construction unit;
2) In order to save the amount of pipeline construction work, the construction unit modifies the water supply method of the fire extinguishing system without authorization.
2. Normative requirements and correct practices.
1 Specification Requirements.
Technical Standard for Automatic Tracking and Positioning Jet Fire Extinguishing System (GB 51427-2021) Article 45.Article 3, paragraph 3. [Figure 2].
2 Do it right.
3. Countermeasures and prevention and control guidelines.
1. In the design of construction drawings, if the fire extinguishing system and the automatic sprinkler system need to be used together with the fire pump, the fire water source should be connected from the main pipe of the sprinkler water supply in front of the sprinkler wet alarm valve group according to the requirements of the specification
2. The construction unit shall carry out the construction of the fire cannon water supply pipeline in strict accordance with the specifications and construction drawing requirements. If it is found that the water supply method of the construction drawing does not meet the requirements, the design change request should be submitted to the design unit in time.
*: Analysis and Prevention Guide for Common Problems of Fire Protection Acceptance of Civil Construction Projects in Jiangsu Province
Technical Standard for Automatic Tracking and Positioning Jet Fire Extinguishing System (GB 51427-2021).
Article 45.Article 3 When the spray type automatic jet fire extinguishing system or the spray type automatic jet fire extinguishing system and the automatic sprinkler system share the fire pump and water supply pipe network, the following provisions shall be met:
Paragraph 3 The two systems shall function properly and without affecting each other.