How much do you know about fixed fire monitor fire extinguishing systems? (The First Part)

Apr 11, 2023 | news

What is a fixed fire monitor fire extinguishing system?

The fixed fire monitor fire extinguishing systems are an indispensable and important technical equipment for modern urban fire protection and industrial fire protection. It is also an effective fire protection technical equipment for quickly and successfully extinguishing large-scale regional and group (equipment or building) major and extra-large fires.

With the rapid development of the national economy and urban construction, various fire factors are also increasing. Urban fires and industrial fires, especially oil terminals, liquefied petroleum gas terminals, liquid chemical terminals, container terminals, oil tankers and cargo ships berthing, Aircraft maintenance hangars, terminal buildings, petrochemical production equipment and storage and transportation equipment, oil and gas fields, oil tank farms, dangerous goods warehouses, exhibition halls, sports venues, and ancient buildings and other key projects or key places such as major fires, causing The probability of major property losses and serious accidents such as mass death and mass injury has increased, which puts forward higher requirements for the fire-fighting operations of the public security fire brigade and the fixed fire-fighting technical equipment.

fire extinguishing systems

In modern fire fighting, only relying on traditional fire extinguishing methods and conventional fire extinguishing facilities is far from meeting the needs of actual fire fighting, especially when the oil tank explodes, the pipelines and foam generators of its fixed installation system may be damaged due to bursting. If it loses its function, the remote control fire monitor fire extinguishing system fixedly installed in the oil tank area can take advantage of its mobility and controllability to quickly and effectively control and extinguish the fire.

In recent years, various firefighting practices have proved: the development of a fire extinguishing system for fire monitors with large flow, long-range, quick response, high fire extinguishing efficiency, wide protection area, and fire extinguishing range, explosion-proof and explosion-proof, remote wired or wireless control, and configured in Key projects or critical places have become the top priority for effectively fighting fires in major projects. The extensive use of fire monitor systems in key projects at home and abroad fully demonstrates that fixed fire monitor systems have played an irreplaceable and vital role in modern urban and industrial fire protection.

Basic rules

1. The construction of the fixed fire monitor fire extinguishing system must be undertaken by the construction unit with the corresponding qualification level.

2. The construction site of the fixed fire monitor fire extinguishing system should have corresponding construction technical standards, a sound quality management system, and a construction quality inspection system, and realize the quality control of the whole construction process. Fixed fire monitor fire extinguishing

3. The construction of the system should be carried out by the approved design and construction drawings, technical documents, and relevant technical standards, and should not be changed arbitrarily. If it is necessary to change, it should be revised by the original design unit.

The following technical information should be available before the construction of the fixed fire monitor fire extinguishing system:

1. Approved design and construction drawings and design instructions;

2. System components (collectively referred to as water monitors, foam monitors, dry powder monitors, fire pumps, foam liquid tanks, foam proportional mixing devices, dry powder tanks, nitrogen cylinders, valves, power sources, fire turrets, and control devices) Install the instruction manual.

3. System components and accessories should have valid certification documents and product delivery certificates that meet the requirements of the market access system.

The construction of a fixed fire monitor fire extinguishing system shall meet the following conditions:

1. The design unit makes a technical disclosure to the construction unit, and there are records;

2. The specifications and models of system components, pipes, and fittings meet the design requirements;

3. The foundation, embedded parts and reserved holes related to the construction shall meet the design requirements after inspection;

4. The site, road, water, electricity, and other temporary facilities meet the construction requirements.

Pipes and fittings for fixed fire monitor fire extinguishing systems

1. The material, specification, model, quality, etc. of pipes and fittings shall comply with the relevant current national product standards and design requirements.

Inspection Quantity: Full inspection.

Inspection method: Check the factory inspection report and certificate of conformity.

2. The appearance quality of pipes and fittings shall comply with the following regulations in addition to the requirements of their product standards:

①There are no cracks, shrinkage cavities, slag inclusions, folds, heavy skin and other defects on the surface;

②The thread surface is intact without damage, and the flange sealing surface is smooth and clean without burrs and radial grooves;

③There is no aging, deterioration, or delamination of the gasket, and no defects such as wrinkles on the surface.

Inspection Quantity: Full inspection.

Inspection method: visual inspection.

3. The specifications, dimensions, wall thickness, and allowable deviation of pipes and fittings shall meet the requirements of their product standards and design.

 Quantity to be inspected: 20% of the products of each specification and model shall be randomly inspected according to the number of pieces, and shall not be less than 1 piece.

Inspection method: Measure with a steel ruler and a vernier caliper.

4. For pipes and fittings that fall into one of the following situations, the supervisory engineer shall take samples, and a testing agency with corresponding qualifications shall carry out testing and re-inspection. The re-inspection results shall comply with the current relevant national product standards and design requirements.

①There are requirements for re-inspection in the design.

②Those who have doubts about the quality.

Quantity for inspection: according to the design requirements or the quantity required for inspection.

Inspection method: Check the re-inspection report.

Extinguishing agent for fixed fire monitor fire extinguishing system

1. When the foam liquid enters the site, it shall be inspected by the construction unit, the supervisory engineer, and the supplier on site, and the samples shall be taken and retained together. The quality of the foam liquid should meet the relevant current national product standards.

Inspection Quantity: Full inspection.

Inspection method: Observation and inspection and inspection of valid certification documents and product delivery certificates required by the market access system.

2. For the foam liquid that falls into one of the following situations, the supervisory engineer shall organize on-site sampling and send it to a testing institution with corresponding qualifications for testing. The results shall meet the current national product standards and design requirements.

①The design dosage of 6% low-expansion foam liquid is greater than or equal to 7.0 t;

②The design dosage of 3% low-expansion foam liquid is greater than or equal to 3.5 t;

③The contract documents stipulate the foam liquid to be sampled and submitted for inspection on site.

Quantity for inspection: According to the quantity required for inspection.

Inspection method: Check the report on the inspection of foaming performance (foaming ratio, 25% liquid analysis time) and fire extinguishing performance (fire extinguishing time, burning resistance time) according to the current relevant national product standards on-site sampling.

3. When the dry powder enters the site, the construction unit, supervisory engineer, and supplier shall organize an on-site inspection, and jointly take samples and keep them. The quality of dry powder should comply with the relevant current national product standards.

Check Quantity: Full check.

Inspection method: Observation and inspection and inspection of valid certification documents and product delivery certificates required by the market access system.

4. For dry powder with a design dosage greater than or equal to 2.0t, the supervision engineer shall organize on-site sampling and send it to a testing institution with corresponding qualifications for testing. The results shall meet the current national product standards and design requirements.

Quantity for inspection: According to the quantity required for inspection.

Inspection method: Inspect the report of on-site sampling by the relevant national product standards for anti-caking and fire-extinguishing effectiveness inspection.

System components and related requirements of fixed fire monitor fire extinguishing system

1. Water cannons, foam cannons, dry powder cannons, fire pumps, foam liquid tanks, foam proportional mixing devices, dry powder tanks, nitrogen cylinders, valves, power sources, fire turrets, control devices and other system components, pressure gauges, and filtration devices The appearance quality of system accessories such as metal hoses and metal hoses shall meet the following requirements:

①No deformation and other mechanical damage;

② The protective coating on the exposed non-machined surface is intact;

③There is no rust on the machined surface without a protective coating;

④All exposed interfaces are not damaged, and the protective materials such as plugs and covers are well sealed;

⑤The nameplate mark is clear and firm.

Inspection Quantity: Full inspection.

Inspection method: observation inspection.

2. Water cannons, foam cannons, dry powder cannons, fire pumps, foam liquid tanks, foam proportional mixing devices, dry powder tanks, nitrogen cylinders, valves, power sources, fire turrets, control devices and other system components, pressure gauges, and filtration devices System accessories such as metal hoses and metal hoses shall meet the following requirements:

①Its specifications, models, and performances should meet the current national product standards and design requirements.

Check Quantity: Full check.

Inspection method: Check the valid certification documents and product delivery certificates required by the market access system.

②When there is a re-inspection requirement on the design or when there is doubt about the quality. Sampling shall be as conducted by supervisory engineers, and testing and re-inspection shall be as carried out by testing units with corresponding qualifications. The re-inspection results shall meet the current national product standards and design requirements.

Quantity for inspection: according to the design requirements or the quantity required for inspection.

Inspection method: Check the re-inspection report.

3. The selection valve, safety valve, pressure reducing valve, one-way valve, high-pressure hose and other components installed in the engineering pipeline of the dry powder gun fire extinguishing system shall consider as subjected to hydraulic pressure strength test. And air pressure tightness test, and shall meet the following requirements:

①The test pressure of the hydraulic strength test shall be 1.5 times the nominal pressure of the component. Moreover, the test pressure of the gas tightness test shall be the nominal pressure of the component;

②When carrying out the hydraulic strength test, the water temperature should not be lower than 5°C. After reaching the test pressure, the pressure stabilization time should not be less than 1 minute. And the visual test piece should not be deformed during the pressure stabilization period;

③The air pressure tightness test should be carried out after the hydraulic strength test. The pressurized medium can be air or nitrogen. During the test, immerse the components in water. After the test pressure is for reaching, the pressure stabilization time should not be less than 5 minutes. At the same time no air bubbles should overflow from the test piece during the pressure stabilization period;

④After passing the component test, it should be dried in time and all exposed interfaces should be closed.

4. The rotation of the fire pump unit should be flexible, without blockage and abnormal sound.

5. The rotating mechanism and operating device of the fire monitor should be flexible and reliable.