GB 50243-2016 English PDF

GB 50243-2016: Code of acceptance for construction quality of ventilation and air conditioning works
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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...