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Code for construction of ventilation and air conditioning
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GB 50738-2011: PDF in English GB 50738-2011
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
UDC
P GB 50738-2011
Code for Construction of Ventilation and Air Conditioning
ISSUED ON: SEPTEMBER 16, 2011
IMPLEMENTED ON: MAY 1, 2012
Issued by: Ministry of Housing and Urban-Rural Construction 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
1 General Provisions ...9
2 Terms ...10
3 Basic Requirements ...12
3.1 Construction Technology Management ...12
3.2 Construction Quality Management ...12
3.3 Material and Equipment Quality Management ...13
3.4 Safety and Environmental Protection ...14
4 Metal Duct and Fittings Making ...15
4.1 General Requirements ...15
4.2 Metal Duct Making ...18
4.3 Fittings Making ...26
4.4 Quality Inspection ...27
5 Nonmetallic or Composite Duct and Fittings Making ...29
5.1 General Requirements ...29
5.2 Polyurethane/Phenolic Composite Duct and Fittings Making ...31
5.3 Glass Fiber Composite Duct and Fittings Making ...35
5.4 Glass Fiber/Magnesium Composite Air Duct and Fittings Making ...39
5.5 Rigid Polyvinyl Chloride Air Duct and Fittings Making ...44
5.6 Quality Inspection ...48
6 Air Valve and Components Making ...50
6.1 General Requirements ...50
6.2 Air Valve ...50
6.3 Hood and Cowl ...51
6.4 Air Opening ...51
6.5 Muffler, Air Duct Muffler, Mend Muffler and Muffling Static Pressure Box ...52
6.6 Soft Coupling Duct ...52
6.7 Filter ...53
6.8 Heater in Air Duct ...54
6.9 Quality Inspection ...54
7 Making and Installation of Trestle and Hanger ...57
7.1 General Requirements ...57
7.2 Trestle and Hanger Making ...58
7.3 Trestle and Hanger Installation ...62
7.4 Installation of Fabricated Pipeline Hanger ...67
7.5 Quality Inspection ...67
8 Air Duct and Components Installation...69
8.1 General Requirements ...69
8.2 Metal Duct Installation ...73
8.3 Nonmetallic or Composite Air Duct Installation ...75
8.4 Soft Coupling Air Duct Installation ...77
8.5 Air Opening Installation ...78
8.6 Air Valve Installation ...78
8.7 Installation of Muffler, Static Pressure Box, Filter and Heater in Air Duct ...78
8.8 Quality Inspection ...79
9 Air Handling Equipment Installation ...81
9.1 General Requirements ...81
9.2 Air Conditioning Terminal Device Installation ...82
9.3 Fan Installation ...83
9.4 Air Handling Unit and Heat Recovery Device Installation ...84
9.5 Quality Inspection ...85
10 Cold/Heat Sources and Auxiliary Equipment Installation ...88
10.1 General Requirements ...88
10.2 Steam Compression Refrigeration (Heat Pump) Unit Installation ...89
10.3 Absorption Refrigerating Unit Installation ...91
10.4 Cooling Tower Installation ...92
10.5 Heat Exchanger Installation ...93
10.6 Heat and Cold Storage Equipment Installation ...93
10.7 Soft Water Device Installation ...95
10.8 Water Pump Installation ...95
10.9 Installation of Refrigeration and Heating Accessory Equipment ...96
10.10 Quality Inspection ...97
11 Installation of Pipeline and Accessory of Air Conditioning Water System ...99
11.1 General Requirements ...99
11.2 Pipe Connection ... 101
11.3 Piping Installation ... 105
11.4 Valve and Accessory Installation ... 107
11.5 Quality Inspection ... 109
12 Refrigeration Pipeline and Accessory Installation ... 111
12.1 General Requirements ... 111
12.2 Pipeline Installation ... 111
12.3 Valve and Accessory Installation ... 113
12.4 Quality Inspection ... 113
13 Anticorrosion and Thermal Insulation ... 115
13.1 General Requirements ... 115
13.2 Pipeline and Equipment Anticorrosion ... 116
13.3 Pipeline of Air Conditioning Water System and Equipment Insulation ... 117
13.4 Air Duct System of Air Conditioning and Equipment Insulation ... 119
13.5 Quality Inspection ... 121
14 Monitoring and Control System Installation ... 124
14.1 General Requirements ... 124
14.2 Monitoring Instrument and Equipment Installation ... 124
14.3 Electric Wire Conduit and Wire Groove Installation and Wiring ... 126
14.4 Central Monitoring and Management System Installation ... 127
14.5 Quality Inspection ... 127
15 Inspection and Testing ... 129
15.1 General Requirements ... 129
15.2 Air Duct Strength and Leakage Test ... 130
15.3 Air Duct System Leakage Test ... 132
15.4 Hydrostatic Test of Water System Valve ... 133
15.5 Hydrostatic Test of Water System Pipeline ... 134
Code for Construction of Ventilation and Air Conditioning
1 General Provisions
1.0.1 This code is formulated with view to strengthening the technology management for the
construction and installation of ventilation and air conditioning, standardizing the construction technology,
intensifying the control over construction and installation processes as well as guaranteeing the
engineering quality.
1.0.2 This code is applicable to the construction and installation of ventilation and air conditioning
involved in the building engineering.
1.0.3 During the construction and installation of ventilation and air conditioning, the requirements for
engineering quality in technical engineering documents and contracting documents shall not be lower
than those specified in this code.
1.0.4 The construction of ventilation and air conditioning shall not only meet the requirements stipulated
in this code, but also comply with those in the current relevant ones of the nation.
3 Basic Requirements
3.1 Construction Technology Management
3.1.1 The enterprise which undertake the construction of ventilation and air conditioning shall have
appropriate construction qualification. And appropriate technical standards shall be available for the
construction site.
3.1.2 Where the construction enterprise undertakes the in-depth design of construction drawings of
ventilation and air conditioning, relevant in-depth design documents shall be confirmed by the original
design organization.
3.1.3 Before construction of ventilation and air conditioning, the development organization shall
organize the design, construction and supervision organizations to make technical disclosure and joint
review on the design documents and to confirm them by signing.
3.1.4 Before construction of ventilation and air conditioning, the construction organization shall
prepare the organization design (scheme) for the construction of ventilation and air conditioning which
shall not be implemented until passing the review of its technical principal and obtaining the approval
of the supervision (development) organization. The construction organization shall make technical
disclosure and provide necessary operation instruction and training for the construction personnel of
ventilation and air conditioning.
3.1.5 The change of construction drawings need be approved by the original design organization.
Where the change of construction drawings involves in the using and energy-saving effects of
ventilation and air conditioning, such change shall be subject to review by the censorship of the
original construction drawing design documents. Before any change is made, relevant procedures
shall be handled and confirmation by the supervision and development organizations is required.
3.1.6 Before system check and test as well as operation and commissioning, the construction
organization shall prepare appropriate technical schemes and subject them to review and approval.
3.1.7 The new technology, process, material and equipment used for or applied to ventilation and air
conditioning shall be evaluated, verified and filed according to relevant requirements. Before construction,
special construction technology schemes shall be formulated for new or first-applied construction
technologies.
3.2 Construction Quality Management
3.2.1 Appropriate quality management system shall be established for the construction site of
ventilation and air conditioning and shall cover the following content:
1 Post responsibility system;
2 Technology management responsibility system;
3 Quality management responsibility system;
4 Regular meeting system for engineering quality analysis.
3.2.2 Construction quality control and inspection system shall be established for the construction site
and shall cover the following content:
1 Implementation check system for construction organization design (scheme) and technical
disclosure;
2 Material and equipment receiving inspection system;
3 Construction process control system;
4 Check system for handing-over inspection between relevant processes and intermediate
delivery between professional works;
5 Construction inspection and test system.
3.2.3 Where the pipeline crosses wall and floor slab, sleeve shall be arranged according to the design
requirements, and flame retardant material shall be used between sleeve and pipeline for compact filling;
where the pipeline crosses fire compartment, incombustible material shall be used for fireproof plugging.
3.2.4 Before connecting pipeline and equipment, the system pipeline shall pass the hydrostatic test
and flushing (purging) test.
3.2.5 Before concealed construction, it shall pass the quality inspection jointly carried out by the
technical (quality) principal of construction project, professional foreman and full-time quality inspector
before reporting it to the supervision engineer (representative of the development organization) for
inspection and acceptance and filling the acceptance records of concealed works. If necessary, images
shall be provided for important positions.
3.2.6 Manhole shall be arranged for concealed equipment and valve and shall meet the requirements
of repair and maintenance.
3.2.7 The instruments for check, test and commissioning shall be calibrated and fall within their
validity.
3.3 Material and Equipment Quality Management
3.3.1 The construction of ventilation and air conditioning shall be carried out according to construction
drawings and relevant technical product documents. The material and equipment in use shall meet the
design requirements and the requirements of relevant current national standards. Those expressly
prohibited or obsoleted by the State must not be used.
3.3.2 The material and equipment used for ventilation and air conditioning shall be provided with
quality certificates in Chinese and shall be complete and effective. The quality certificates shall reflect
the variety, specification, quantity and performance index of material and equipment and shall comply
with the received material and equipment. The type inspection report on equipment shall be applicable
for such series of products and shall fall within its validity.
3.3.3 Where the material and equipment approaches the construction site, the construction organization
shall inspect and test them and report it to the supervision engineer (representative of the development
organization) for acceptance and filling the acceptance records of received material (equipment) as soon
as such inspection and test are passed. Those that fail to pass such acceptance shall not be used.
3.3.4 The thermal insulation material and fan coil used for ventilation and air conditioning shall be
inspected through evidential sampling according to the relevant requirements of the current national
standard “Code for Acceptance of Energy-efficient Building Construction” GB 50411 where they
approach the construction site.
3.4 Safety and Environmental Protection
3.4.1 The enterprise which undertakes the construction of ventilation and air conditioning shall have
appropriate safe production license. Appropriate safety and environmental protection management
system shall be established for the construction and installation site where full-time safety personnel
shall be arranged.
3.4.2 Disclosure of safety technology shall be carried out before the construction of ventilation and
air conditioning. The safety precautions and facilities for construction shall meet the relevant national
requirements. The construction equipment shall be used according to appropriate safety regulations.
3.4.3 The temporary power utilization at the construction site shall comply with the relevant current
national standards. During construction, effective measures shall be taken to guarantee the safety of
power utilization and equipment operation.
3.4.4 During electric and gas welding, the operation personnel shall take their posts with certificates
and a special person shall be arranged to supervise them; moreover, fire-fighting equipment shall be
provided. After completion of electric and gas welding, careful inspection shall be carried out before
leaving to eliminate potential hazards.
3.4.5 Where the material and equipment are handled and hoisted on site, a special person shall be
arranged for command so as to avoid injuring any person or damaging any material and equipment.
3.4.6 Before hoisting and transporting large equipment, special technical scheme shall be prepared
and shall not be implemented until it is approved.
3.4.7 In case of operation under relatively enclosed environment, temporary ventilation measures
shall be taken.
3.4.8 Where paint and adhesive are used, protective measures shall be taken and the operation area
shall keep well ventilated.
3.4.9 The inflammables, explosives and other hazardous articles shall be stored safely and separately.
The volatile articles shall be preserved in sealed condition while the residues and storage vessels of
hazardous articles shall be recycled properly.
3.4.10 Dust control and noise reduction measures shall be taken for construction processes where
smoke, dust and noise may be generated.
6 Air Valve and Components Making
6.1 General Requirements
6.1.1 The materials for making air valve and components shall meet the requirements of design and
relevant technical documents.
6.1.2 The finished air valve and components in use shall have acceptable quality certificates.
6.2 Air Valve
6.2.1 The quality of finished air valve shall meet the following requirements:
1 The specification of air valve shall meet the requirements of product technology standards and
shall meet the design and service requirements;
2 The air valve shall start and stop flexibly, with sound construction, tight shell, good anti-
corrosion and smooth surface and without visible scar and deformation; moreover, it shall be free from
such defects as crack and rust.
3 The rotatable components in air valve shall be wear-proof and corrosion-resistant, with flexible
rotating mechanism as well as reliable braking and positioning device;
4 The air valve flange shall match with the air duct flange.
6.2.2 The manual regulating valve shall close clockwise and its indicated opening shall be consistent
with the vane opening. The vane overlapping shall fit closely and regularly. The gap between vane and
valve body shall be less than 2mm.
6.2.3 Operation test shall be carried out on the driving device of electric and pneumatic regulating air
valve. The test result shall meet the requirements of technical product documents and such valve shall
operate normally under the maximum design operating pressure.
6.2.4 The fire valve and smoke discharge valve (smoke vent) shall meet the requirements of the
relevant national current technical standards on fire protection products. Operation test shall be carried
out on the actuating mechanism and the test result shall meet the requirements of product specifications.
6.2.5 As for check air valve, it shall inspect whether its members are complete. Strength test shall be
carried out for the valve under the maximum design operating pressure and the valve leaf shall have no
deformation and leakage at closed position. The horizontal check air valve shall have reliable balance
regulating mechanism.
6.2.6 As for flashboard air valve, the flashboard shall be flat and smooth and have reliable positioning
and fixing device. The upper and lower connection pipes of oblique flashboard air valve shall be in
alignment.
6.2.7 As for tee regulating air valve, its bat-handle switch shall be indicated with the regulating angle;
the valve plate shall be convenient for regulating and shall not collide with air duct.
6.3 Hood and Cowl
6.3.1 The hood and cowl shall be made according their types and service requirements. After sampling
the selected materials based on the construction drawing, they may be prepared and processed by biting
and welding. The making method may be in accordance with the requirements of Chapter 4 in this code.
6.3.2 The size and construction of hood made on site shall comply with the design requirements and
relevant technical product documents, and shall meet the following requirements:
1 The hood shall have sound construction, regular shape and smooth surface both inside and
outside, and its enclosure shall be free from sharp corner.
2 Water collecting sump shall be arranged below the exhaust hood of cooker in the kitchen. As
for umbrella hood for discharging steam or other humid gas, water collecting sump for discharging
condensate shall be arranged at the inside of the hood mouth. Water filling test shall be carried out for
water collecting sump so as to ensure the sump is unblocked and free from leakage.
3 The suction inlet of suction hood at the sump side and slot ventilated hood shall be flat and
smooth; the arc at corner shall be uniform; the spacing between reinforcing plates at the hood mouth
shall be consistent;
4 The exhaust hood as for exhaust hood below the cooker in kitchen, its oil smoke filter shall be
convenient for dismantling and cleaning.
6.3.3 The size and construction of cowl made on site shall comply with the design requirements and
relevant technical product documents. The cowl shall have sound construction, regular shape both inside
and outside as well as smooth surface, and shall meet the following requirements:
1 The edge of umbrella cowl shall be strengthened, with consistent bracing height;
2 As for the cone combination of conical cowl, its seam shall be downstream and shall guarantee
the unblocked drainage of the lower part;
3 As for the outer cylinder of cylindrical cowl, its upper and lower edges shall be strengthened.
The distance from the canopy edge to the outer cylinder shall be consistent. The wind-shielding ring
shall be correctly positioned.
4 As for trifurcate cowl, the connection between its branch pipe and main pipe shall be tight with
consistent included angle.
6.4 Air Opening
6.4.1 The finished air opening shall have sound construction and smooth outside external surface; its
vane shall be distributed uniformly without consistent color and free from scratch and deformation.
Moreover, it shall meet the requirements of product technology standards. Its surface shall be subject
to anti-corrosive treatment and shall meet the design and service requirements. The air opening shall be
able to rotate flexibly and reliably. After positioning, it shall be free from any looseness.
6.4.2 As for louver air opening, the center of axles on both ends of its vane shall in the same straight
line; moreover, the vane shall be straight and even without friction with the frame.
6.4.3 The diffusion ring and regulating ring of air diffuser shall be of the same axle and the spacing
between axial ring sheets shall be distributed uniformly.
6.4.4 As for the air opening of orifice plate, its orifice shall be free from burrs and of the same diameter
and spacing; moreover, it shall meet the design requirements.
6.4.5 The moving parts of rotary air opening shall be portable and flexible and tightly fit with the
fixing frame. The regulation range of vane angle shall meet the design requirements.
6.4.6 The internal and external spherical surfaces of spherical air opening shall fit properly with each
other and rotate freely. After positioning, there shall be no looseness.
6.5 Muffler, Air Duct Muffler, Mend Muffler and Muffling Static Pressure Box
6.5.1 The making of muffler, air duct muffler, mend muffler and muffling static pressure box shall
meet the design requirements. According to different forms of lofting and preparation, machining should
be adopted.
6.5.2 The making of enclosure and frame structure shall meet the following requirements:
1 The frame shall be firm and the shell free from leakage. The making, riveting, biting and
welding of frame, internal cover plate, clapboard and flange may refer to those specified in Chapter 4
of this code. The internal and external dimensions shall be accurate, the connection shall be firm and its
shell shall be free from sharp edge.
2 The hole diameter and penetration rate of metal perforated plate shall meet the design
requirements. The burrs at the orifice of perforated plate shall be flattened so as to prevent it from
damaging the facing cloth.
3 During the installation of individual sound splitters, they shall be arranged regularly, and their
upper and lower ends shall be installed with frame for fixing such sound splitters. The frame shall be
firmly fixed without any looseness.
6.5.3 The muffling material shall have anti-corrosion and damp-proofing functions; its hygienic
performance, density, heat conductivity coefficient and combustion level shall meet the requirements
of relevant national technical standards. The muffling material shall be uniformly laid according to the
unit density as required in the design and relevant technical documents. The part to be bonded shall be
firmly bonded according to the specified thickness, with compact splicing seam and smooth surface.
6.5.4 After filling the muffling material, air-permeable facing material shall be used to cover it. The
facing material shall be spliced in the downstream direction, with compact splicing seam and smooth
surface and free from unevenness.
6.5.5 As for the internal and external metal members of muffler, air duct muffler, mend muffler and
muffling static pressure box, their surfaces shall be subject to anti-corrosive treatment and shall be smooth.
6.5.6 After finishing the making of muffler, air duct muffler, mend muffler and muffling static pressure
box, professional inspection shall be carried out on their specifications and direction signs.
6.6 Soft Coupling Duct
6.6.1 The soft coupling duct consists of flexible short duct and flexible duct. The soft coupling duct
7 Making and Installation of Trestle and Hanger
7.1 General Requirements
7.1.1 The fixing mode of trestle and hanger and the use of fittings shall meet the design requirements and
shall meet the following requirements:
1 The trestle and hanger shall meet their load bearing requirements;
2 The trestle and hanger shall be fixed to reliable building structure and shall not affect the
structure safety;
3 The trestle and hanger must not be welded on the steel bars of load-bearing structure and roof
truss;
4 The pipeline shall not be laid until the cement mortar for embedding trestle reaches the required
strength.
7.1.2 The embedded parts of trestle and hanger shall be correctly, firmly and reliably positioned. The
embedded structure shall be de-rusted and degreased and shall not be painted. The exposed part shall
be subject to anti-corrosive treatment.
7.1.3 As for air conditioning duct and cold and hot water pipe, thermal-insulating lining for their
trestle and hanger shall be selected according to the design requirements and shall meet the following
requirements:
1 The thickness of thermal-insulating lining shall not be less than the thickness of thermal
insulation layer of pipeline, and its width shall be greater than the width of supporting surface for trestle
and hanger. The lining shall be complete and compact with thermal insulation material without any gap;
2 Thermal-insulating lining shall meet the requirements of its bearing capacity, and shall have no
deformation after installation;
3 Where wooden material is adopted as thermal-insulating lining, anticorrosion treatment shall
be carried out;
4 Thermal-insulating lining shall have regular shape and smooth surface without any defect.
7.1.4 The finished product protection measures for the making and installation of trestle and hanger
shall cover the following items:
1 After finishing the making of trestle and hanger, they shall be de-rusted with steel brush and
abrasive cloth, and shall be painted after removing the contaminants on their surfaces；
2 Where the trestle and hanger are installed in an exposed way, they shall be painted with
finishing paint;
3 The finished trestle and hanger of pipeline shall be stored separately and clearly marked.
7.1.5 The safety and environmental protection measures for the making and installation of trestle and
hanger shall cover the following items:
1 Where electric hammer is adopted for the installation of trestle and hanger, no person shall
8 Air Duct and Components Installation
8.1 General Requirements
8.1.1 Before air duct and components installation, the following construction requirements shall be
met:
1 The installation plan has been defined and the technical standards and documents on quality
control measures are complete;
2 The air duct and accessory material has passed the receiving inspection and meet the
installation requirements;
3 The environment at construction position meets the requirements of operating conditions;
4 The installation coordinates, elevation and direction of air duct has passed the technical review
and meet the design requirements;
5 The installation and construction equipment has been prepared and meet the installation
requirements;
6 The position of reserved hole in building structure has been checked and the hole dimension
meet the continuous thermal insulation requirements of sleeve and pipeline.
8.1.2 When the air duct crosses fire-proof and explosion-proof floor slab or wall to be enclosed, steel
embedded duct or protective sleeve with wall thickness not less than 1.6mm shall be arranged.
Incombustible flexible material with no harm on human body shall be applied between air duct and
protective sleeve for blockage.
8.1.3 The duct installation shall meet the following requirements:
1 The specification, size and installation position of air duct shall be determined according to the
design requirements;
2 The distance from the connection interface of air duct and components to the wall surface and
floor slab shall not affect the operation. The interface of components for connecting valve must not be
installed in wall or floor slab;
3 Where the air duct is connected by flange., its nut shall be arranged at the same side; the flange
gasket shall not project into the inwall of air duct or beyond the flange;
4 Where the air duct is connected with air channel, embedded flange or installed connection piece
shall be adopted at the interface of air channel. The seam shall be filled with fire-proof sealing filler.
The air channel interface shall be firm;
5 Pipelines must not cross the air duct or laid in it;
6 The inhaul cable for fixing outdoor vertical pipe must not be connected with lightning rod or
lightning conduction;
7 As for air duct system for conveying gas containing inflammable or explosive, or installed in
inflammable or explosive environment, favorable grounding measures shall be taken. Where the air
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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