GB 50243-2016 PDF English
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Code of acceptance for construction quality of ventilation and air conditioning works
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Code for acceptance of construction quality of conditioning works
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Code for construction and acceptance of ventilation and air conditioning works
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GB 50243-2016: PDF in English GB 50243-2016
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
UDC
P GB 50243-2016
Code of acceptance for construction quality of
ventilation and air conditioning works
Issue date: October 25, 2016 Implementation date: July 1, 2017
Issued by: Ministry of Housing and Urban-Rural Development of the
People's Republic of China;
General Administration of Quality Supervision, Inspection
and Quarantine.
Table of Contents
Foreword ... 6
1 General provisions ... 7
2 Terms ... 7
3 Basic requirements ... 10
4 Duct making ... 15
4.1 General requirements ... 15
4.2 Dominant items ... 17
4.3 General items ... 26
5 Duct accessory ... 39
5.1 General requirements ... 39
5.2 Dominant items ... 39
5.3 General items ... 42
6 Duct system installation ... 46
6.1 General requirements ... 46
6.2 Dominant items ... 47
6.3 General items ... 51
7 Installation of fan and air handling equipment... 58
7.1 General requirements ... 58
7.2 Dominant items ... 58
7.3 General items ... 63
8 Cold/heat source and auxiliary equipment installation ... 70
8.1 General requirements ... 70
8.2 Dominant items ... 71
8.3 General items ... 75
9 Installation of pipeline and equipment of air conditioning water system... 80
9.1 General requirements ... 80
9.2 Dominant items ... 80
9.3 General items ... 85
10 Anticorrosion and thermal insulation ... 97
10.1 General requirements ... 97
10.2 Dominant items ... 97
10.3 General items ... 98
11 System commissioning ...101
11.1 General requirements ... 101
11.2 Dominant items ... 102
11.3 General items ... 107
12 Final acceptance ...110
Code of acceptance for construction quality of
ventilation and air conditioning works
1 General provisions
1.0.1 This code is developed with a view to unifying the quality acceptance for
construction of ventilation and air conditioning and guaranteeing the work safety and quality.
1.0.2 This code is applicable to construction quality acceptance of the ventilation and air
conditioning for industrial and civil buildings.
1.0.3 This code shall be used in conjunction with the current national standard GB 50300
Unified Standard for Constructional Quality Acceptance of Building Engineering.
1.0.4 The requirements for constructional quality of work which are specified for
ventilation and air conditioning works in engineering technical document and work contract
shall not be lower than those specified in this code.
1.0.5 The construction quality acceptance for ventilation and air conditioning works shall
comply with not only this code but also the current relevant standards of the nation.
2 Terms
2.0.1
ventilation works
generic term for air supply, air exhaust, smoke control/exhaust, dedusting and pneumatic
conveying system works
2.0.2
air conditioning works
generic term for comfort air conditioning, constant temperature and humidity air
conditioning, cleanroom air purification and air conditioning system works
2.0.3
duct
duct, made from metallic, nonmetallic sheet or other material, for ventilation.
2.0.4
operation
(of cleanroom) with facilities operating in specified mode, at the presence of specified
number of personnel, and production equipment operating in the status as agreed between
the owner and the supplier
2.0.24
declared quality level
upper limit of total unqualified product(s) in inspection lot
3 Basic requirements
3.0.1 The acceptance for construction quality of ventilation and air conditioning works
shall comply with not only the provisions of this code but also approved design documents
and contracted items.
3.0.2 As far as works modification is concerned, a design alteration notice or technical
approval from the Designer must be provided. Where the construction enterprise
undertakes in-depth design for the construction drawings of ventilation and air conditioning,
the drawings shall be confirmed by engineering design organization.
3.0.3 The main raw materials, as well as the material, specification and performance of
finished product, semi-finished product and equipment, shall comply with the design
documents and current national standards and materials or equipment that are expressly
prohibited or obsoleted by the State shall not be adopted. The site acceptance of main raw
material, finished product, semi-finished product and equipment shall meet the following
requirements:
1 The approaching quality acceptance shall be confirmed by supervision engineer or the
relevant person in-charge of the Developer.
2 Imported materials and equipment shall be provided with valid documents such as
commodity inspection conformity certificate and Chinese quality certificate.
3.0.4 The new technology, new process, new material and new equipment adopted by
ventilation and air conditioning works shall be provided with certificate of special technical
appraisal acceptance.
3.0.5 The construction of ventilation and air conditioning works shall be carried out
following established procedure and cooperate with civil engineering and other disciplines.
The finished civil engineering construction relevant to ventilation and air conditioning
system shall be jointly checked by the Developer (or General Contractor), Supervisor,
Designer and Constructor. Organization of such joint check should be in the charge of the
2 Terminal devices of water system include radiant panel coil, internal coils of fan coil unit and air
conditioning cabinet, plate heat exchanger, etc.
3 Automatic control systems of device include various transducers, e.g. temperature, pressure and flow,
actuators, automatic control, intelligent system device and software, etc.
3.0.8 The acceptance for construction quality of ventilation and air conditioning
subdivision project shall be carried out by the section projects listed in Table 3.0.7 herein
according to actual engineering conditions. The quality acceptance of subdivision project
shall be carried out after the section projects it is affiliated are completely accepted.
3.0.9 The acceptance for construction quality of ventilation and air conditioning section
project shall be carried out according to the specific provisions herein corresponding to the
section project. Section projects shall adopt one-off acceptance or acceptance by times,
depending on the actual conditions of construction engineering. The acceptance lots and
sample quantity may be determined according to the quantity and distribution of physical
materials for the project, and shall cover the entire section project. When the section project
involves ducts or pipes of multiple materials and construction processes, the acceptance
lots should by classified by material.
3.0.10 The sampling for quality acceptance of inspection lot shall meet the following
requirements:
1 The quality acceptance of inspection lot shall be in accordance with Annex B herein
The sampling assessment scheme with product percent of pass larger than or equal to 95%
shall be deemed as sampling scheme I (hereinafter referred to as "Scheme I") and is mainly
applicable to dominant items; the sampling assessment scheme with product percent of
pass larger than or equal to 85% shall be deemed as sampling scheme II (hereinafter
referred to as "Scheme II") and is mainly applicable to general items.
2 If it is found that the product sample quantity, n, required by the sampling assessment
scheme exceeds the product quantity, N, of inspection lot, all the products in the entire
inspection lot shall be inspected.
3 The inspection of mandatory provision shall adopt one hundred percent inspection
scheme.
3.0.11 The acceptable quality for the inspection lot acceptance of section project shall
meet the following requirements:
1 Where the inspected party, through self-inspection, meets the requirements of this
Code in terms of the quality of inspection lot and is granted with a construction acceptance
record indicating corresponding accepted quality, the construction quality acceptance by
inspection lot may be carried out.
2 If one hundred percent inspection scheme is adopted, all the inspection results of
dominant item quality shall be acceptable. As for general items, the quality inspection
results and percent of pass by count shall not be less than 85% and no major defects shall
present.
3 If the inspection adopts sampling scheme and the inspection result of inspection lot is
acceptable, the lot quality acceptance shall be considered pass. Where the inspection
result of sampling inspection lot does not comply with acceptable requirements, the tested
party may apply for reinspection or retest.
4 Any product found unacceptable by quality acceptance shall be repaired or replaced
by acceptable one.
3.0.12 The warranty period for the construction quality of ventilation and air conditioning
works shall be calculated from the date on which the final acceptance is passed and last
for two heating periods and cooling periods. For any construction quality problem
encountered in the warranty period, the construction enterprise shall fulfill the warranty
responsibilities.
3.0.13 The cleanliness grade of the clean room (area) in air cleaning and conditioning
system shall meet the design requirements. The Maximum acceptable concentration of
airborne particles shall be in accordance with those specified in Table D.4.6-1. The
inspection of the cleanliness grade of clean room (area) shall comply with D.4 of Annex D
hereof.
4 Duct making
4.1 General requirements
4.1.1 The quality acceptance of duct shall be carried out respectively by the material,
processing technique and system class and shall cover such items such as the material,
specification, strength, tightness and as-finished appearance quality of duct.
4.1.2 The sheets, profiles and other main materials for fabricating duct shall be subjected
to acceptance for approaching the site and their quality shall meet the design requirements
and the relevant requirements of current national standard and shall be supported by ex-
factory inspection certificate. The finished duct selected in the engineering shall be
provided with product qualification certificate or be subjected to strength and reinspection
on site.
Inspection quantity: according to Scheme I.
Inspection method: by measuring with ruler, visual inspection, and checking material
quality certificate and product qualification certificate.
4.2.7 The fabrication of duct for air cleaning and conditioning system shall meet the
following requirements:
1 The internal surface of duct shall be flat and smooth; no reinforcing frame or reinforcing
rib shall be set up inside the duct.
2 Duct shall be free from transversely spliced seam. Where the bottom edge width of
rectangular duct is less than or equal to 900mm, the bottom surface shall be free from
spliced seam; where it is more than 900mm and less than or equal to 1800mm, the bottom
surface shall have at most 1 spliced seam; where it is larger than 1800 mm but less than
or equal to 2700 mm, the bottom surface shall have at most 2 spliced seam.
3 The material for the bolt, nut, washer and rivet for duct shall be compatible with the duct
material performance and shall not introduce electrochemical corrosion.
4 Where the air cleanliness is class N1~N5, the spacing of bolt and rivet hole for duct
flange shall not be larger than 80mm; where the air cleanliness is class N6~N9, it shall not
be larger than 120mm. Self-plugging rivets shall not be adopted.
5 Rectangular duct shall not use connection with S-shaped or right-angle slip. Where the
side length of the duct for air cleaning and conditioning system is larger than 1000mm, no
connection with steel sheet flange pinchcock shall be used in the absence of appropriate
reinforcement measure.
6 For ducts for air cleaning and conditioning system of N1~N5 air cleanliness classes, no
stud-snap crimp connection shall be adopted.
7 Ducts shall be cleaned after fabrication. The cleaning agent shall not be harmful to
human body, duct material and product.
Inspection quantity: according to Scheme I.
Inspection method: by checking the material quality certificate, visual inspection and
ignition test, and wiping with white silk cloth.
4.3 General items
4.3.1 The fabrication of metallic duct shall meet the following requirements:
1 The fabrication of duct using metallic flange connection shall meet the following
requirements:
1) The crimped seam between duct and fitting shall be tight, consistent in width, straight
and even in lapels, and uniform in arcs, with the two end faces parallel. Duct shall be free
from obvious distortion and uplifting angle and its surface shall be flat and smooth, with
unevenness not larger than 10mm.
2) Where the outside diameter or outer side length of duct is less than or equal to 300mm,
its permissible deviation shall not be larger than 2mm; where the outside diameter or outer
side length of duct is larger than 300mm, it shall not be larger than 3mm.The permissible
deviation of duct mouth planeness shall not be larger than 2mm; the length difference
between the two diagonals of rectangular duct shall not be greater than 3mm; the
difference between any two diameters of circular flange shall not be greater than 3mm.
3) The weld of welded duct shall be plump, flat and smooth and shall be free from defects
such as bump, penetrating slag inclusion and porosity, cracking. By visual inspection, the
duct shall be flat and smooth and shall be free from unevenness larger than 10mm.
4) The weld of duct flange shall be well-fused, plump and free from false welding and
hole. The permissible deviations for the outside diameter or outer side length and
planeness of flange shall not be larger than 2mm.As for flanges from the same batch and
of the same specification, arrangement of bolt holes shall be consistent and
interchangeable.
5) Where riveting are used for connection between duct and flange, there shall be no
sign of rivet escape or rivet omission; turnups shall be even and clung to the flange, their
width shall be consistent and shall not be smaller than 6mm; seamings and the four corners
of rectangular duct shall be free from cracks and holes.
6) Where welding connection is adopted between duct and flange, the weld shall be lower
than the end face of flange. The duct of dedusting system should adopt full welding inside
and intermittent welding outside. Where spot welding fixation is adopted between duct and
flange, the welding points shall be of good fusion; the spacing between the welding points
shall not be larger than 100mm; the flange shall be clung to the duct; penetrating gaps or
holes shall not occur.
7) Galvanized steel plate duct shall have no more than 10% signs of badly damaged
galvanized coat such as efflorescence and chalking.
8) Where the flange of aluminum plate or stainless steel plate duct adopts carbon steel
material, the material specification shall comply with 4.2.3 and shall be subject to anti-
Inspection method: by observation and inspecting with ruler.
4.3.7 The included angle of single-side reducer for duct should not be less than 30°, while
that of double-side reducer should not be less than 60°. The included angle between the
branch and main duct of circular duct should not be greater than 60°.
Inspection quantity: according to Scheme II.
Inspection method: by measuring with ruler and visual inspection.
4.3.8 The fabrication of refractory duct shall meet the following requirements:
1 The permissible deviation for the caliber of refractory duct shall meet the requirements
of 4.3.1 hereof.
2 For refractory duct adopting profile steel framework externally applied with fireproof
plate, the framework welding shall be firm; the surfaces shall be flat and smooth; the
deviation shall not be larger than 2mm. The laying form of fireproof plate shall be regular;
the fixation shall be firm; joints shall be tightly blocked with fireproof material and shall be
free from perforation.
3 For refractory duct adopting metallic duct externally applied with fire-proof thermal
insulation, the duct tightness requirements regarding metallic duct for pressure system
given in 4.2.1 hereof shall apply. The arrangement of the fire-proof thermal insulation shall
be in accordance with those specified in Chapter 10 hereof.
Inspection quantity: according to Scheme II.
Inspection method: by measure with ruler and visual inspection.
5 Duct accessory
5.1 General requirements
5.1.1 Outsourced duct accessories shall have certification of acceptable product quality
and corresponding technical data.
5.1.2 The linear size tolerance of duct accessory shall meet the requirements of Grade
C tolerance as specified in the current national standard GB/T 1804 General tolerances—
Tolerances for linear and angular dimensions without individual tolerance indications.
5.2 Dominant items
5.2.1 The variety, specification and performance of duct accessory material shall meet
the design requirements.
Inspection quantity: according to Scheme I.
Inspection method: by observation, measuring with ruler and checking product qualification
certification.
5.2.2 The performance parameters of outsourced finished duct accessory shall comply
with the design requirements and relevant technical documents.
Inspection quantity: according to Scheme I.
Inspection method: by visual inspection and checking product technical documents.
5.2.3 The fabrication of finished air valve shall meet the following requirements:
1 Air valve shall be equipped with opening indicator which shall be able to reflect
accurately the opening of valve leaf.
2 The handwheel or handle of manual air flow regulating valve shall turn off clockwise.
3 The drive actuator of electric and pneumatic regulating valve shall actuate reliably and
normally operate under the maximum working pressure.
4 The air valve, moving parts, fixed parts and fasteners of air cleaning and conditioning
system shall take anti-corrosion measures; the main shaft of air valve blade shall tightly fit
for the shaft sleeve of valve body and shall take sealing measures.
5 Regulating air valves whose working pressure is larger than 1000Pa shall be provided
with strength test certificate or test report indicating the ability of free on/off under 1.5 times
the working pressure by the manufacturer.
6 Airtight valve shall be able to turn off tightly and its air leakage shall meet the design
requirement.
Inspection quantity: according to Scheme I.
Inspection method: by observation, measuring with ruler, manual manipulation and
checking testing report.
5.2.4 The fabrication of fire valve, smoke exhaust valve or smoke outlet shall meet the
relevant requirements of the current national standard GB 15930 Fire dampers for building-
venting and smoke-venting system and shall have corresponding product qualification
Inspection quantity: 100% inspection.
Inspection method: by visual inspection and checking the burning behavior test report of
material.
5.3 General items
5.3.1 The moving mechanism of duct accessory shall actuate flexibly, braking and
positioning devices shall actuate reliably and the flange specification shall be compatible
with the duct flange connected.
Inspection quantity: according to Scheme II.
Inspection method: by visual inspection, manual manipulation and measuring with ruler.
5.3.2 The fabrication of air valve shall meet the following requirements:
1 Single-blade air valve shall have a firm structure, open/close flexibly and close tightly,
and the clearance to valve body shall be less than 2mm. Multi-blade air valve shall not
have obvious looseness while opening; blade overlapping shall fit closely and consistently
while blades are closed. Multi-blade air valve whose sectional area is larger than 1.2m2
shall implement regulation by group
2 The rotating shaft and hinge of check valve leaf shall adopt rust-resistant material. The
valve leaf, under maximum load pressure, shall not have bending deformation, open/close
flexibly and close tightly. Check valves installed horizontally shall have balance regulating
mechanism.
3 The junction between the rotating shaft or tie bar of handle of tee regulating air valve
and duct (valve body) shall be tight. The valve plate shall not collide or contact with the
duct. Regulating shall be convenient. The handle and valve leaf shall be located in the
same angular position. The tie bar shall be able to perform positioning and fixing within the
manipulation range.
4 The body of flashboard air valve shall be tight and the inner walls shall be subjected to
anti-corrosion treatment. The flashboard shall be flat and smooth, open/close flexibly and
be provided with positioning and fixing device. The upper and lower nozzles of oblique
flashboard air valve body shall be in alignment.
5 The flow constant range and precision of constant flow air valve shall meet the
requirements of product technical document and engineering design.
6 The permissible deviation of air valve flange dimension shall be in accordance with
following requirements:
1 Silencing materials shall meet the requirements of engineering design and the casing
shall be firm and airtight.
2 The silencing material filled in dissipative silencer shall have a volume density meeting
the design requirements, be laid uniformly and provided with measures against settlement.
The material, thickness and pitch of the sound splitters in splitter-type resistive silencer
shall meet the requirements of product technical documents.
3 For the anechoic chamber (segment) assembled on site, the structure, quantity, pitch
and fixation of sound splitter shall meet the design requirements.
4 The junction between the partition plate and wall plate of impedance-combined type
and micro-perforated (aperture) plate-type silencer shall be tight; the plate surfaces shall
be flat, smooth and burr-free; the aperture (perforated hole width), perforation (aperture)
rate and resonant cavity size shall meet the relevant requirements of current national
standard.
5 The interface between the silencer and silencing static pressure chamber shall be
compatible with the duct connected and the permissible dimensional deviation shall be in
accordance with those specified in Table 5.3.2.
Inspection quantity: according to Scheme II.
Inspection method: by visual inspection, measuring with ruler and checking material quality
certificate.
5.3.7 The fabrication of flexible stub shall meet the following requirements:
1 The outside diameter or outer side length shall be compatible with duct dimensions.
2 Anti-corrosion, damp-proof, air-proof and mould-proof flexible materials shall be used.
3 The materials used for air cleaning and conditioning system shall also be smooth inside
and dust proof.
4 The length of flexible stub should be 150mm ~ 250 mm; the making up or bonding up
of joint shall be firm, reliable and free of cracking; formed stub shall be flat, smooth and
free of distortion sign.
5 Flexible stub shall not be used as reducing connection pipe. The connection between
rectangular flexible stub and duct shall not adopt hoop connection type.
...... Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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