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GB 50261-2017: Code for installation and commissioning of sprinkler systems
GB 50261-2017
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
UDC
Code for installation and
commissioning of sprinkler systems
ISSUED ON: MAY 27, 2017
IMPLEMENTED ON: JANUARY 01, 2018
Issued by: Ministry of Housing and Urban-Rural Development of the
People's Republic of China;
General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China.
Table of Contents
Foreword ... 6
1 General provisions ... 8
2 Terminologies ... 9
3 Basic requirements ... 10
3.1 Quality management ... 10
3.2 Material and equipment management ... 11
4 Installation and construction of water supply facilities ... 16
4.1 General requirements ... 16
4.2 Installation of fire pump ... 16
4.3 Installation of fire tank and construction of fire reservoir ... 18
4.4 Installation of pressure fire water supply equipment and pressure
maintenance pump ... 19
4.5 Installation of fire department connection ... 20
5 Installation of pipeline network and system components ... 23
5.1 Installation of pipeline network ... 23
5.2 Installation of sprinklers ... 32
5.3 Installation of alarm valve set ... 40
5.4 Installation of other system components ... 43
6 System pressure testing and flush washing ... 50
6.1 General requirements ... 50
6.2 Water pressure testing ... 52
6.3 Gas pressure testing ... 53
6.4 Flush washing ... 53
7 System commissioning ... 55
7.1 General requirements ... 55
7.2 Contents and requirements ... 55
8 System acceptance ... 59
9 Maintenance ... 66
Appendix A -- Classification for subprojects and subunits of sprinkler systems
... 70
Appendix B -- Construction site quality management inspection records ... 71
Appendix C -- Quality inspection records for sprinkler systems installation
processes ... 72
Appendix D -- Inspection records for quality control documentation of sprinkler
systems ... 76
Appendix E -- Records of acceptance for sprinkler system projects ... 78
Appendix F -- Classifications for deficiencies in sprinkler system acceptance
... 81
Appendix G -- Inspection items for maintenance and supervision of sprinkler
systems ... 82
Explanation of wording in this Code ... 83
List of quoted standards ... 84
1 General provisions
1.0.1 This Code is formulated with view to ensuring the construction quality and
use function of sprinkler system (hereinafter referred to as system), reducing
fire hazard and protecting personal and property safety.
1.0.2 This Code is applicable to the construction, acceptance, maintenance and
management of sprinkler system arranged in industrial and civil buildings.
1.0.3 The construction, acceptance, maintenance and management of sprinkler
system shall not only meet those specified in this Code, shall also comply with
the requirements of relevant national current standards and codes.
3 Basic requirements
3.1 Quality management
3.1.1 The subproject and subunit of sprinkler system shall be classified
according to Appendix A.
3.1.2 Construction scheme for system construction shall be prepared according
to the design requirements. Necessary technical standard for construction,
sound construction quality management system and work quality inspection
system shall be provided on construction site, and relevant records shall be
filled in according to the requirements of Appendix B.
3.1.3 The following conditions shall be provided prior to sprinkler system
construction:
1 The construction drawing shall be examined and approved or recorded before
construction. Drawings such as plan drawing, system drawing (axonometric
drawing and schematic diagram of development system) and detail drawing for
construction as well as technical documents such as instructions, equipment
list, material and equipment list shall be complete.
2 The design organization shall make technical disclosure to the construction,
development and supervision organizations.
3 The system components and pipe fittings as well as other equipment and
materials shall be able to ensure the normal construction.
4 The construction site and the water, electricity and gas used during
construction shall meet the construction requirements and shall ensure
continuous construction.
3.1.4 The construction of sprinkler system project shall be in accordance with
the approved project design documents and technical standard for construction.
3.1.5 The construction process quality control of sprinkler system project shall
be carried out in accordance with the following requirements:
1 As for the procedures, quality control shall be carried out according to
technical standard for construction. After completion of each procedure,
inspection shall be carried out, and the next procedure may be started only after
passing such inspection.
2 Handing-over inspection shall be carried out among work types of various
switch, water flow indicator, fire pump and pump adapter shall pass the testing
by the National Quality Supervision and Inspection Center of Fire Products; the
pressure maintenance pump, automatic exhaust valve, signal valve, multi-
function pump control valve, check valve, relief valve, reducing valve, butterfly
valve, gate valve, pressure gauge, etc. shall pass the testing of corresponding
national product quality supervision and inspection center.
Inspection quantity: 100 % inspection.
Inspection method: inspecting relevant data.
3.2.2 Galvanized steel pipes and pipe fittings shall be subject to site
appearance inspection, and shall meet the following requirements:
1 The galvanized steel pipe shall be hot-dip galvanized on both internal and
external walls, and the galvanized layer on internal and external surfaces of
steel pipe shall be free from phenomena like shedding and corrosion; both
inside and outside diameters of steel pipe shall meet the requirements of the
current national standard GB/ T 3091 Welded Steel Pipes for Low Pressure
Liquid Delivery or GB/T 8163 Seamless Steel Tubes for Liquid Service.
2 The surface shall be free from crack, shrinkage cavity, slag inclusion, fold and
double skin.
3 The sealing face of thread shall be complete and free from damage and burr.
4 The non-metallic sealing gasket shall have flexible texture, and be free from
aging deterioration or layering, and its surface shall be free from defects like
depreciation and wrinkle.
5 The flange sealing face shall be complete, smooth and clean and shall be
free from burrs and radial groove; the thread of threaded flange shall be
complete without damage.
Inspection quantity: 100 % inspection.
Inspection method: observing and inspecting with ruler.
3.2.3 Stainless steel pipes and pipe fittings shall be subject to site appearance
inspection, and shall meet the following requirements:
1 Both the inside and outside diameters of stainless steel pipe shall meet the
requirements of the current national standard GB/T 12771 Welded Stainless
Steel Pipes for Liquid Delivery or GB/T 19228.2 Stainless Steel Press-fitting
Assemblies - Part 2: Light Gauge Stainless Steel Tubes for Press-fittings.
2 The surface shall be free of crack and damage.
5 Pipes and pipe fittings shall be light-tight.
Inspection quantity: 100 % inspection.
Inspection method: observing and inspecting with ruler.
3.2.7 Site inspection of sprinkler must comply with the following requirements:
1 Marks such as the trademark, type, nominal operating temperature,
response...