GB 50261-2017 English PDF

GB 50261-2017: Code for installation and commissioning of sprinkler systems
Delivery: 9 seconds. Download (& Email) true-PDF + Invoice.
Get Quotation: Click GB 50261-2017 (Self-service in 1-minute)
Historical versions (Master-website): GB 50261-2017
Preview True-PDF (Reload/Scroll-down if blank)

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 time index (RTI), manufacturer and production date of sprinkler
shall be complete.
2 Type, specification, etc. of sprinkler shall meet the design requirements.
3 The sprinkler appearance shall be free of processing defect and
mechanical damage.
4 The sealing face of sprinkler thread shall be free from scar, burr, wire
shortage or break.
5 Close-type sprinkler shall be subject to sealing performance test, and that
without leakage and damage shall be regarded as acceptable.
Test quantity shall be 1 % from each batch through random sampling, and shall
not be less than 5; the test pressure shall be 3.0 MPa, and the pressure holding
time shall not be less than 3 min. Where two or more pieces are rejected,
sprinklers of this batch cannot be used. Where there is only one piece rejected,
2 % (not less than 10 pieces) shall be randomly taken for sealing performance
test; if there are still rejected ones, sprinklers of this batch shall not be used.
Inspection quantity: complying with Item 5 of this clause.
Inspection method: observing and testing on special test device; the main
testing equipment includes pressure test pump, pressure gauge and stopwatch.
3.2.8 Site inspection of valve and its accessories shall meet the following
requirements:
1 The marks like trademark, type and specification of valve shall be complete,
and the type and specification of valve shall meet the design requirements.
2 The valve and its accessories shall be complete and free from processing
defect and mechanical damage.
3 In addition to such marks as trademark, type and specification, the alarm
valve shall also be provided with permanent mark of flow direction.
4 The disc and operating mechanism of alarm valve and control valve shall be
4 Installation and construction of water supply facilities
4.1 General requirements
4.1.1 As for installation of such water supply facilities as fire pump, fire tank, fire
reservoir, pressure fire water supply equipment and fire department connection
as well as their auxiliary pipelines, the dirt and sundries inside shall be cleaned.
In case that the installation is interrupted, the opening shall be sealed.
4.1.2 Safe and reliable protective measures shall be taken for the fire water
supply facility, and the installation position shall be convenient for the routine
operation, maintenance and management.
4.1.3 Where fire water pipe is directly connected with municipal water supply
pipe and domestic water supply pipe, the connection shall be equipped with
backflow preventer.
4.1.4 During installation of water supply facility, the ambient temperature shall
not be lower than 5 °C; anti-freezing measures shall be taken where the
ambient temperature is lower than 5 °C.
4.2 Installation of fire pump
Dominant item
4.2.1 The specification and type of fire pump shall meet the design
requirements and shall be provided with product qualification certificate and
installation and operation instruction.
Inspection quantity: 100 % inspection.
Inspection method: observing according to drawing.
4.2.2 Installation of fire pump shall meet the requirements of the current national
standards GB 50231 General Code for Construction and Acceptance of
Mechanical Equipment Installation Engineering and GB 50275 Code for
Construction and Acceptance of Computer, Fan and Pump Installation
Engineering.
Inspection quantity: 100 % inspection.
Inspection method: inspecting with ruler and observing.
4.2.3 Installation of inlet pipe and its fittings shall meet the following
requirements:
Inspection quantity: 100 % inspection.
Inspection method: observing.
4.3 Installation of fire tank and construction of fire reservoir
I Dominant item
4.3.1 Construction and installation of fire reservoir and fire tank shall meet the
requirements of the current national standards GB 50141 Code for Construction
and Acceptance of Water and Sewerage Structures and GB 50242 Code for
Acceptance of Construction Quality of Water Supply Drainage and Heating
Works. Arrangement mode and position of water level display device of fire
reservoir and elevated fire tank shall meet the requirements of the design
document.
Inspection quantity: 100 % inspection.
Inspection method: inspecting with ruler and observing.
4.3.2 Water-proof sleeve shall be arranged on the inlet and outlet pipes of
reinforced concrete fire reservoir or fire tank, and flexible joint shall be arranged
for pipeline with vibration. The inlet and outlet pipe joints of combined fire
reservoir or fire tank should be connected with flange; in case that other
connection is adopted, rust-proof treatment shall be carried out.
Inspection quantity: 100 % inspection.
Inspection method: observing.
II General item
4.3.3 The volume and installation position of elevated fire tank and fire reservoir
shall meet the design requirements. During installation, the clear distance
between the external wall of the reservoir (tank) and the wall surface of building
structure or other reservoir wall shall meet the requirements of construction or
assembly. The clear distance on the side surface without pipeline should not be
less than 0.7 m while that on the side surface with pipeline should not be less
than 1.0 m; the width of passage between external wall of pipeline and wall
surface of building should not be less than 0.6 m; for the reservoir top with
manhole, the clearance between top slab surface and the upper building slab
bottom shall not be less than 0.8 m; the distance from assembled elevated fire
tank bottom to the floor should not be less than 0.5 m.
Inspection quantity: 100 % inspection.
Inspection method: inspecting with ruler according to drawing.
Inspection quantity: 100 % inspection.
Inspection method: observing according to drawing.
4.4.2 The installation position as well as the directions of inlet pipe and outlet
pipe of pressure fire water supply equipment shall meet the design
requirements; check valve shall be installed for outlet pipe with an overhaul
passage, which should not be less than 0.7 m in width, arranged around it; the
distance from the top of pressure fire water supply equipment to the floor slab
or beam bottom should not be less than 0.6 m.
Inspection quantity: 100 % inspection.
Inspection method: inspecting with ruler and observing according to drawing.
II General item
4.4.3 Installation of safety valve, pressure gauge, drain pipe, water level
indicator and pressure control instrument etc. on pressure fire water supply
equipment shall meet the ...