GB 50084-2017 PDF English
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| GB 50084-2017 | English | 145 |
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GB 50084-2017: Code for design of sprinkler systems---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GB50084-2017
UDC GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
P GB 50084-2017
Code for design of sprinkler systems
Issued on. MAY 27, 2017
Implemented on. JANUARY 01, 2018
Issued by. Ministry of Housing and Urban-Rural Development of PRC;
General Administration of Quality Supervision, Inspection and
Quarantine.
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
Code for design of sprinkler systems
Drafted by. Ministry of Public Security of PRC
Approved by. Ministry of Housing and Urban-Rural Development of PRC
Date of implementation. January 1st, 2018
China Planning Press
2017 Beijing
Table of Contents
Foreword... 6
1 General provisions... 8
2 Terminologies and symbols... 9
3 Hazard classifications of occupancies... 15
4 Basic requirements... 16
5 Basic design parameters... 19
6 System components... 30
7 Sprinklers arrangement... 35
8 Pipe... 47
9 Hydraulic calculation... 50
10 Water supply... 56
11 Operation and control... 59
12 Local application system... 61
Appendix A Examples of classification of occupancies... 64
Appendix B Examples of classifications of plastics and rubbers... 66
Appendix C List of equivalent lengths... 67
Appendix D Local resistance factor of pressure-reducing orifice plate... 68
Explanation of wording in this code... 69
List of quoted standards... 70
1 General provisions
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 Terminologies and symbols
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.
3 Hazard classifications of occupancies
3.0.1 The fire hazard of occupancies is divided into light hazard level, medium
hazard level (level I and level II), serious hazard level (level I and level II), and
warehouse hazard level (level I, II and III).
3.0.3 When there is a significant difference between the fire risk and the
difficulty of fire extinguishing in each place of the building, it should determine
the system type selection and fire hazard level in accordance with the actual
situation of each place.
4 Basic requirements
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 Basic design parameters
5.0.1 The basic design parameters for the use of wet pipe sprinkler
systems in civil buildings and workshops shall not be less than those
specified in Table 5.0.1.
5.0.7 For the warehouses and similar places which are equipped with the
sprinkler systems, when using the shelf storage, it shall use the steel shelf and
the transparent level plate, and the transparent part area in the layer plate shall
not be less than 50% of the total area of the level plate. When using wooden
shelf or enclosed level plate shelf, the system setting shall be determined by
stacking storage warehouse.
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 System components
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 Sprinklers arrangement
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 Pipe
8.0.1 The working pressure of the system pipes shall not be greater than 1.20
MPa, no other water facilities shall be installed.
8.0.2 The system pipes can be internally and externally hot-dip galvanized steel
pipes, coated steel pipes, copper pipes, stainless steel pipes and chlorinated
polyvinyl chloride (PVC-C) pipes. When the pipeline upstream of the alarm
valve inlet uses non-corrosive resistant steel pipe, a filter shall be installed
upstream of the alarm valve.
8.0.4 When sprinklers and system pipes are connected by fire sprinkler hoses,
they shall meet the following requirements.
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 Hydraulic calculation
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.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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