GB 50084-2017Code for design of sprinkler systems (English PDF)

1.0.1 This code is developed to properly and reasonably design sprinkler

systems and to protect the safety of the person and property.

1.0.2 This code applies to the design of sprinkler systems in newly built, expanded or rebuilt civil and industrial buildings.

This code does not apply to the design of sprinkler systems in buildings of special functions such as gunpowder, explosives, ammunition, pyrotechnics factories, nuclear power plants and hangars.

1.0.3 The design of the sprinkler system shall closely integrate the functions of protection objects and fire characteristics, and actively adopt new technologies, new equipment, and new materials, so that they are safe, reliable, technologically advanced, and economically reasonable.

1.0.4 The system components used in the design must comply with the current relevant national standards and shall meet the requirements of the market access system for firefighting products.

1.0.5 When the buildings or the areas in the buildings which are set sprinkler

system change their applications, it shall check the suitability of the original system. When it is not applicable, it shall be redesigned in accordance with this code.

1.0.6 The design of sprinkler systems shall comply with the provisions of the relevant current national standards in addition to the provisions of this code.

2.1 Terms

2.1.1 Sprinkler system

The automatic fire extinguishing system that can spray water in the event of a fire, which consists of sprinkler, alarm valve sets, waterflow alarm devices (waterflow indicators or pressure switches), as well as pipelines, water supply facilities, etc.

2.1.2 Close-type sprinkler system

The sprinkler system which uses the close-type sprinklers.

2.1.3 Open-type sprinkler system

The sprinkler system which uses the open-type sprinklers.

2.1.7 Recycling preaction sprinkler system

The preaction sprinkler system that can close the valve automatically after putting out fire and open the valve again to spray water in case of re-ignition.

2.1.8 Deluge sprinkler system

An open-type system which consists of an open-type sprinkler and a deluge alarm valve set, is controlled by the automatic fire alarm system or transmission pipe in case of a fire, to automatically start the deluge alarm valve set and to start the fire water pump, for the purposes of putting out fire.

2.1.12 Cooling protection sprinkler system

A close-type system which consists of a close-type sprinkler, a wet pipe alarm valve set, etc., used to cool fireproof shutter, fireproof glass walls and other fireproof partitions in the event of a fire.

2.1.13 Operation area of sprinkler system

The maximum area protected by the system based on spray intensity in a fire.

2.1.14 Response time index (RTI)

Thermal performance indicators for close-type sprinklers.

2.1.15 Fast response sprinkler

The close-type sprinkler which has a response time index RTI <= 50 (m - s) 0.5.

2.1.16 Special response sprinkler

The close-type sprinkler which has a response time index 50 < RTI <= 80 (m - s) 0.5.

2.1.21 Standard orifice sprinkler

Standard coverage sprinkler which has a flow coefficient K = 80.

2.1.22 Early suppression fast response (ESFR) sprinkler

The standard coverage sprinkler which has a flow coefficient K >= 161 and a response time index RTI <= 28 ± 8 (m - s) 0.5, used to protect the stacks and high rack warehouses.

4.1 General requirements

4.2 Selection of systems

4.3 Others

4.3.1 The dry pipe sprinkler system, pre-action sprinkler system, deluge sprinkler system, and sprinkler-foam combination system in the building to protect local places can be connected in series to the wet pipe sprinkler system in the same building, and it shall be connected to the feed mains.

4.3.2 The sprinkler system shall have the following components, accessories and facilities.

5.0.16 Except as otherwise provided in this code, the continuous water spray

time of a sprinkler system shall be determined in accordance with the requirements that the fire duration is not less than 1 h.

5.0.17 For the dry pipe sprinkler system and pre-action sprinkler system using pressurized gas as the starting medium, the pressure value in the system pipes shall be determined in accordance with the technical performance of the alarm valve; for the pre-action sprinkler system using pressurized gas to check whether the pipeline is tight, the pressure value in the system pipes should neither be less than 0.03 MPa nor more than 0.05 MPa.

6.1 Sprinklers

6.1.1 Where a close-type sprinkler system is to be installed, the sprinkler type

and the maximum headroom height of the place shall comply with the requirements of Table 6.1.1; the sprinklers used only to protect building components such as interior steel trusses and the places wherein the shelf built-in sprinklers are provided may not be limited by the requirements of this Table.

6.1.4 Dry pipe sprinkler systems and pre-action sprinkler systems shall use the vertical sprinklers or dry type pendent sprinklers.

6.1.5 The sprinkler selection of the drencher sprinkler system shall meet the following requirements.

6.2 Alarm valve set

6.2.1 The sprinkler system shall be equipped with an alarm valve set. The close-type sprinkler system which is used to protect the building components such as steel roof trusses, it shall provide an independent alarm valve set. The drencher system shall be equipped with independent alarm valve sets or temperature-sensitive deluge alarm valve.

6.3 Waterflow indicator

6.4 Pressure switch

6.5 System test connection

7.1 General requirements

7.2 Distance between sprinklers and barriers

7.2.1 The distance between the vertical and pendant type sprinklers and barriers such as beams and ventilation ducts (Figure 7.2.1) shall comply with the provisions of Table 7.2.1.

7.2.4 The horizontal distance and vertical distance between the standard coverage sprinkler, extended coverage sprinkler and household sprinkler and the partition wall which does not reach the top (Figure 7.2.4) shall comply with the provisions of Table 7.2.4.

7.2.5 The distance between vertical, pendent sprinklers and barriers against walls (Figure 7.2.5) shall meet the following requirements.

7.2.6 In the range of 1.2 m right front of the side-wall type standard coverage sprinkler, and in the range of 2.4 m right front of the side-wall type extended coverage sprinkler and side-wall type household sprinkler (Figure 7.2.6), there shall be no barrier which blocks spraying below the top plate or suspended ceiling, the layout shall be in accordance with the requirements of Table 7.2.6-1 and Table 7.2.6-2.

7.2.7 The distance from the two sides of the side-wall type sprinkler to the top Horizontal distance from sprinkler to barrier a Vertical distance from sprinkler splash tray to bottom surface of barrier b

8.0.6 Pipes with a diameter equal to or greater than 100 mm in the system shall

be flanged or connected with a grooved connection (clamp). The length of the pipe between the flanges on the horizontal pipeline should not be greater than 20 m; the distance between the flanges on the riser shall not span more than 3 floors. In places where the headroom height is greater than 8 m, the riser shall have a flange.

9.1 Design flow rate of system

9.1.1 The working pressure of the sprinkler at the most unfavorable point of the system shall be determined through calculation. The flow rate of the sprinkler shall be calculated as follows.

9.1.3 The design flow rate of the system shall be determined in accordance with the total flow rate of the water spraying by all the sprinklers within the action area at the same time at the most unfavorable point, it shall be calculated as follows.

9.1.4 For the cooling protection system used to protect such fire partition facilities as fireproof shutters and fire-retardant glass walls, the system design flow rate shall be determined by the total flow rate of the sprinklers simultaneously spraying water within the calculated length. The calculated length shall meet the following requirements.

9.1.6 For the warehouses with shelf built-in sprinklers, the design flow rate of the sprinklers below the top plate and the sprinklers built-in the shelf shall be calculated separately, and the system design flow rate shall be determined as the sum of their design flow rates.

9.2 Hydraulic calculation of pipes

9.2.1 The flow rate of water in the pipeline shall adopt economic flow rate, if necessary, it can exceed 5 m/s, but it shall not exceed 10 m/s.

9.2.2 The resistance loss along the unit length of the pipeline shall be calculated as follows.

9.3.4 Head loss of throttle pipes shall be calculated as follows.

9.3.5 The setting of the pressure relief-valve shall meet the following requirements.