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GB 50261-2017 (GB50261-2017)

GB 50261-2017_English: PDF (GB50261-2017)
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GB 50261-2017English245 Add to Cart 0--9 seconds. Auto-delivery Code for installation and commissioning of sprinkler systems Valid GB 50261-2017

BASIC DATA
Standard ID GB 50261-2017 (GB50261-2017)
Description (Translated English) Code for installation and commissioning of sprinkler systems
Sector / Industry National Standard
Classification of Chinese Standard P16
Word Count Estimation 145,110
Date of Issue 2017-05-27
Date of Implementation 2018-01-01
Older Standard (superseded by this standard) GB 50261-2005
Regulation (derived from) Housing and Urban-Rural Development Bulletin 2017 No. 1577

Standards related to: GB 50261-2017

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 requirements of product instructions.
Inspection quantity: 100 % inspection.
Inspection method: observing according to drawing.
4.4.4 The specification and type of pressure maintenance pump shall meet the
design requirements; product certificate and installation and operation
instructions shall be provided.
Inspection quantity: 100 % inspection.
Inspection method: observing according to drawing.
4.4.5 The installation of pressure maintenance pump shall meet the relevant
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 Fan,
Compressor and Pump Installation.
Inspection quantity: 100 % inspection.
Inspection method: inspecting with ruler and observing.
4.5 Installation of fire department connection
I Dominant item
4.5.1 Assembly-type fire department connection shall be installed in the
5 Installation of pipeline network and system
components
5.1 Installation of pipeline network
I Dominant item
5.1.1 Where steel pipes are adopted for pipeline network, the material shall
meet the requirements of the current national standards GB/T 8163 Seamless
Steel Tubes for Liquid Service and GB/T 3091 Welded Steel Pipes for Low
Pressure Liquid Delivery.
Inspection quantity: 100 % inspection.
Inspection method: checking material quality qualification document and
performance detection report, inspecting with ruler and observing.
5.1.2 Where stainless steel pipes are adopted for pipeline network, the material
shall meet the requirements of the current national standards GB/T 12771
Welded Stainless Steel Pipes for Liquid Delivery and GB/T 19228.2 Light
Gauge Stainless Steel Pipes for Stainless Steel Press-fittings.
Inspection quantity: 100 % inspection.
Inspection method: checking material quality qualification document and
performance detection report, inspecting with ruler and observing.
5.1.3 Where copper pipelines are adopted for pipeline network, the material
shall meet the requirements of the current national standards GB/T 18033
Seamless Copper Tubes for Water and Gas, GB/T 11618.1 Pipe Fittings of
Copper and Copper Alloys - Part 1: Fittings of Braze Welding Type and GB/T
11618.2 Pipe Fittings of Copper and Copper Alloys - Part 2: Fittings of Press
Type.
Inspection quantity: 100 % inspection.
Inspection method: checking material quality qualification document and
performance detection report, inspecting with ruler and observing.
5.1.4 Where coating steel pipes are adopted for pipeline network, the material
shall meet the requirements of the current national standard GB 5135.20
Automatic Sprinkler System - Part 20: Coating Steel Pipe.
Inspection method: observing and inspecting with level ruler.
5.1.11 Connection of grooved pipe fittings shall meet the following requirements:
1 The selected grooved pipe fittings shall meet the requirements of the current
national standard GB 5135.11 Automatic Sprinkler System - Part 11: Grooved
Couplings and Fittings, the material shall be ductile cast iron and shall meet the
requirements of the current national standard GB/T 1348 Spheroidal Graphite
Iron Castings; the material of rubber sealing ring shall be EPDM (ethylene
propylene diene monomer) and meet the requirements of ISO 6182-12
Performance Requirements and Test Methods for Quick Coupling of Metal
Pipeline System.
2 During connection of grooved pipe fittings, the groove and opening for
pipeline connection shall be processed with special channeling machine and
tapping machine, and corrosion-proof treatment shall be conducted; before
connection, groove and hole dimension shall be inspected and processing
quality shall meet the technical requirements; groove and hole shall be free
from any burr, damaging crack and dirt.
Inspection quantity: randomly inspecting 20 % and not less than 5.
Inspection method: observing and inspecting with ruler.
3 Rubber sealing ring shall be free from damage and deformation.
Inspection quantity: randomly inspecting 20 % and not less than 5.
Inspection method: observing.
4 After the convex edge of grooved pipe fitting is clipped into the groove, the
bolt shall be fastened, both sides shall be simultaneously fixed; in case of any
wrinkled rubber ring, it shall be replaced by a new one.
Inspection quantity: randomly inspecting 20 % and not less than 5.
Inspection method: observing.
5 Where mechanical tee connection is adopted, the clearance between
mechanical tee and hole shall be inspected; each part shall be uniform and
fixed to the right position; the hole spacing of mechanical tee shall not be less
than 500 mm and that of mechanical cross shall not be less than 1000 mm;
where mechanical tee and cross are connected, the aperture of branch pipe
shall meet those specified in Table 5.1.11.
Table 5.1.11 -- Maximum permissible diameter of branch pipe used for
connection (mechanical tee and mechanical cross) (mm)
2 It shall not be supported on joint.
Inspection quantity: randomly inspecting 20 % and not less than 5.
Inspection method: inspecting with ruler.
2 The type, material, processing dimension and welding quality of pipeline
support, hanger and restraining rack shall meet the design requirements and
the requirements of relevant current national standard.
3 The installation positions of pipeline support and hanger shall not interfere
with the sprinkling effect of sprinkler; the distance between pipeline
support/hanger and sprinkler should not be less than 300 mm and that between
pipeline support/hanger and end sprinkler should not be greater than 750 mm.
Inspection quantity: randomly inspecting 20 % and not less than 5.
Inspection method: inspecting with ruler.
4 The quantity of hanger set on each straight pipe section of distributing branch
and pipe section between two adjacent sprinklers should not be less than 1,
and the spacing between hangers should not be greater than 3.6 m.
Inspection quantity: randomly inspecting 20 % and not less than 5.
Inspection method: observing and inspecting with ruler.
5 Where the nominal diameter of pipeline is greater than or equal to 50 mm,
the quantity of restraining racks set on each section of distributing main and
distributing pipe shall not be less than 1 and the spacing between restraining
racks should not be greater than 15 m; where the direction of pipeline changes,
restraining rack shall be added.
Inspection quantity: 100 % inspection.
Inspection method: observing and inspecting with ruler.
6 As for distributing main installed vertically, it shall be fixed with pipe clamp at
the center, restraining racks shall be arranged at its initial and terminal ends or
its initial and terminal ends shall be fixed with pipe clamp; the distance from
installation position to the ground or the floor should be 1.5 ~ 1.8 m.
Inspection quantity: 100 % inspection.
Inspection method: observing and inspecting with ruler.
5.1.16 Anti-deformation measures shall be taken if pipeline passes through the
deformation joint of building. Where the pipeline passes through wall or floor
steel pipe and copper pipe and chlorinated polyvinyl chloride (PVC-C) pipe.
5.1.21 Installation of stainless steel pipe shall meet the following relevant
requirements:
1 Where thin-walled stainless steel pipe is connected with other pipes, pipe
fittings and accessories, measures shall be taken to avoid electrochemical
corrosion.
2 Where the thin-wall stainless steel pipeline with nominal diameter of DN25 ~
50 is connected with other pipelines, special thread switching connector (such
as GTHY or entrapment stainless steel pipe) shall be adopted for connection.
3 Where the thin-wall stainless steel pipeline with nominal diameter of DN65 ~
100 is connected with other pipelines, special flange switching connector
should be adopted for connection.
4 Where the thin-wall stainless steel pipeline with nominal diameter DN greater
than or equal to 125 is connected with other pipelines, grooved pipe fitting
connection or flange connection should be adopted.
5.1.22 Installation of copper pipe shall meet the following relevant requirements:
1 Braze welding may be used for connection between copper pipe and pipe
fittings in various specifications; as for the copper pipe with diameter not greater
than DN50 and required to be dismantled, ferrule connection may be adopted;
as for the copper pipe with diameter not greater than DN50, entrapment
connection may be adopted; as for the copper pipe with diameter not less than
DN50, grooved connection may be adopted.
2 Copper alloy products should be adopted for pipeline supporting elements.
Where steel support is adopted, soft isolation pad shall be arranged between
pipeline and support which shall not generate corrosion on pipeline.
3 Where groove connector is non-copper material, necessary corrosion-proof
measures shall be taken for its contact surface.
5.1.23 Installation of chlorinated polyvinyl chloride (PVC-C) pipeline shall meet
the following relevant requirements:
1 Socket and spigot type bonding connection shall be adopted between
chlorinated polyvinyl chloride (PVC-C) pipes and pipe fittings; butt connection
of chlorinated polyvinyl chloride (PVC-C) flange and flange of other material
shall be adopted among chlorinated polyvinyl chloride (PVC-C) pipes and
flanged pipeline, valve and pipe fittings; threaded connection of injection
molding pipe fittings of thread coupling shall be adopted among chlorinated
polyvinyl chloride (PVC-C) pipes and threaded pipeline, valve and pipe fittings;
decorative coating for the decoration cover plate of sprinkler and concealed
sprinkler.
Inspection quantity: 100 % inspection.
Inspection method: observing.
5.2.3 For installation of sprinklers, special spanner shall be adopted, and the
frame of sprinkler is strictly forbidden for tightening; in case of any deformation
of sprinkler frame and splash box or damage of relief element, the sprinkler
shall be replaced by another one of the same specifications and type.
Inspection quantity: 100 % inspection.
Inspection method: observing.
5.2.4 The sprinkler installed in the place prone to mechanical damage, sprinkler
guards and shields shall be arranged.
Inspection quantity: 100 % inspection.
Inspection method: observing.
5.2.5 In installation of sprinklers, the distance from splash box to ceiling, door,
window, opening or obstacle shall meet the design requirements.
Inspection quantity: randomly inspecting 20 % and not less than 5.
Inspection method: inspecting with ruler according to drawing.
5.2.6 Before installation, the type, specification and operating site of sprinkler
shall be inspected and meet the design requirements. Where concealed
sprinkler is adopted for the system, the elevation of distributing branch and
opening dimension of ceiling shall be exactly controlled.
Inspection quantity: 100 % inspection.
Inspection method: observing according to drawing.
II General item
5.2.7 Where nominal diameter of sprinkler is less than 10 mm, filter shall be
installed on distributing mains or distributing pipes.
Inspection quantity: 100 % inspection.
Inspection method: observing.
with alarm valve set shall be provided with a drainage facility, of which drainage
capacity shall meet the requirements of alarm valve commissioning,
acceptance and emptying system pipeline by water test valve.
Inspection quantity: 100 % inspection.
Inspection method: inspecting records of system pressure testing and flush
washing, observing and inspecting with ruler.
5.3.2 Installation of alarm valve set accessories shall meet the following
requirements:
1 Pressure gage shall be installed in the position on alarm valve convenient for
observation.
Inspection quantity: 100 % inspection.
Inspection method: observing.
2 Drainage pipe and test valve shall be installed in the position convenient for
operation.
Inspection quantity: 100 % inspection.
Inspection method: observing.
3 Water supply control valve shall be installed to be convenient for operation,
and shall be provided with visible opening/closing mark and reliable locking
facilities.
Inspection quantity: 100 % inspection.
Inspection method: observing.
5.3.3 Installation of wet alarm valve set shall meet the following requirements:
1 Pipelines in front of and behind the alarm valve shall be filled with water
smoothly; in case of pressure fluctuation, water powered alarm shall be free
from false alarm.
Inspection quantity: 100 % inspection.
Inspection method: observing and opening valves for water release at the flow
rate less than a sprinkler.
2 Filter on alarm flow path shall be installed in the position in front of retarder
convenient for slagging operation.
(3) Accelerator.
Inspection quantity: 100 % inspection.
Inspection method: observing.
9 Inflation pressure of pipeline network shall meet the design requirements.
5.3.5 Installation of deluge valve set shall meet the following requirements:
1 Deluge valve set may be opened electrically, or manually or by transfer pipe,
and installation of opening control device shall be safe and reliable. Installation
of water transfer pipe shall meet the relevant requirements of wet pipe system.
2 If pipelines behind deluge valve set of pre-action system require air inflation,
their installation shall meet the relevant requirements of dry alarm valve set.
3 Installation position of observation instrument and operation valve of deluge
valve set shall meet the design requirements, and shall be convenient for
observation and operation.
Inspection quantity: 100 % inspection.
Inspection method: observing.
4 Installation position of manual opening device for the deluge valve set shall
meet the design requirements and the device shall be able to be opened safely
and convenient for operation in case of fire.
Inspection quantity: 100 % inspection.
Inspection method: observing according to drawing and inspecting by opening
valves.
5 Pressure gauge shall be installed on one side of water supply for the deluge
valve.
Inspection quantity: 100 % inspection.
Inspection method: observing.
5.4 Installation of other system components
I Dominant item
5.4.1 Installation of water flow indicator shall meet the following requirements:
1 The water flow indicator shall be installed after the pipeline pressure testing
alarm.
5.4.5 Installation position of inspector's test connection and water test valve
shall be convenient for inspection and test, and drainage facilities with
corresponding drainage capacity shall be provided.
Inspection quantity: 100 % inspection.
Inspection method: observing
II General item
5.4.6 Signal valve shall be installed on the pipeline in front of the water flow
indicator, and distance between it and water flow indicator should not be less
than 300 mm.
Inspection quantity: 100 % inspection.
Inspection method: observing and inspecting with ruler.
5.4.7 Exhaust valve shall be installed after system pipeline network pressure
testing and flush washing are acceptable; exhaust valve shall be installed at
the top of distributing main or end of distributing pipe, and it shall be free from
leakage.
Inspection quantity: 100 % inspection.
Inspection method: observing and inspecting record of pipeline pressure testing
and flush washing.
5.4.8 Installation of throttle pipe and pressure-reducing orifice plate shall meet
the design requirements.
Inspection quantity: 100 % inspection.
Inspection method: observing according to drawing and inspecting with ruler.
5.4.9 Outgoing lines of pressure switch, signal valve, and water flow indicator
shall be locked by waterproof casing.
Inspection quantity: 100 % inspection.
Inspection method: observing.
5.4.10 Installation o...
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