GB 50281-2006 English PDF (GB50281-2006)

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GB 50281-2006: [Replaced by GB 50151-2021] Code for installation and acceptance of foam extinguishing systems
GB 50281-2006
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
UDC
P GB 50281-2006
Code for Installation and Acceptance of Foam
Extinguishing Systems
Issued on: June 19, 2006 Implemented Date: November 1, 2006
Issued by: Ministry of 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 ... 7
2 Terms ... 8
3 Basic Regulations ... 9
4 Entrance Inspection ... 12
4.1 General Regulations ... 12
4.2 Entrance Inspection of Materials ... 12
4.3 Entrance Inspection of Systemic Assemblies ... 13
5 System Construction ... 16
5.1 General Regulations ... 16
5.2 Installation of Fire Pump ... 16
5.3 Installation of Foam Liquid Tank ... 17
5.4 Installation of Foam Proportioner (Device) ... 19
5.5 Installation of Pipe, Valve and Foam Hydrant ... 20
5.6 Installation of Foam Generation Device ... 28
6 System Debugging ... 33
6.1 General Regulations ... 33
6.2 System Debugging ... 33
7 System Acceptance ... 37
7.1 General Regulations ... 37
7.2 System Acceptance ... 37
8 Maintenance ... 39
8.1 General Regulations ... 39
8.2 Periodic Inspection and Test of System ... 39
Appendix A Dividing of Part Project, Subpart Project and Item Project of
Foam Extinguishing System ... 41
Appendix B Records for Construction and Acceptance of Foam Extinguishing
System ... 42
Appendix C Measurement Method for Expansion Ratio ... 53
Appendix D Records for Maintenance of Foam Extinguishing System ... 55
Explanation of wording in this code ... 57
1 General Provisions
1.0.1 This specification has been established to ensure construction quality, normalize
acceptance and maintenance for foam extinguishing system (or called System for short).
1.0.2 This code applies to construction, acceptance and maintenance of low, medium and
high expansion foam extinguishing system mounted in newly-built, expanded and rebuilt
project.
1.0.3 Requirement of project technical documents, contract documents as well as
construction and acceptance adopted for foam extinguishing system construction shall be not
below regulations of this code.
1.0.4 Besides this specification, construction, acceptance and maintenance of construction,
acceptance and maintenance of shall comply with regulations of related compulsory standards
and specifications at present.
2 Terms
2.0.1 Foam proportioner (device)
Equipment (relevant equipment and accessories) for proportioning mixing of water and foam
to form foam mixed liquor.
2.0.2 Foam generating device
A general designation of devices to make foam mixed liquor generate foam.
2.0.3 Foam concentrate storage tank
Tankage able to provide foam liquor for foam extinguishing system.
2.0.4 Foam guiding cover
Device mounted on the top of outer floating roof tank wall to make foam flow downward
along tank wall and prevent foam from running off.
2.0.5 Foam descending groove
Stepped device mounted in fixed roof tank to make water-resistant foam flow downward.
2.0.6 Foam flowing groove
Groove device mounted on inner wall of fixed roof tank to make water-resistant foam flow
downward along inner wall.
3 Basic Regulations
3.0.1 Part project, subpart project and item project of foam extinguishing system shall be
divided according to Appendix A of this code.
3.0.2 Construction of foam extinguishing system must be undertaken by construction unit
with corresponding qualification grade.
3.0.3 Construction site of foam extinguishing system shall have corresponding construction
technical standard, complete quality management system and construction quality
examination system to achieve overall process quality control.
Quality management of construction site shall be checked and recorded according to
requirements of Table B.0.1 in this Code.
3.0.4 Construction of foam extinguishing system shall be carried out according to approved
design shop drawing, technical documents and regulations of relevant technical standards, and
no arbitrary change is allowed. Necessary changes shall be conducted by its primary design
unit.
3.0.5 The following technical materials shall be provided before construction of foam
extinguishing system:
1 Approved design shop drawings and design specification;
2 Installation and operation instructions of main assemblies;
3 Effective certificates and product ex-works conformity certificates meeting
requirements of the Market Access System shall be provided for assemblies and
materials of the system, such as foam generation device, foam proportioner (device),
foam liquid pressure tank, fire pump, foam hydrant, valves, pressure gage, piping
filter, foam liquid, tubing and pipe fittings, etc..
3.0.6 The following conditions shall be provided for the construction of foam extinguishing
system:
1 Technical disclosure with record shall be conducted by design unit to construction
unit;
2 Specs and types of assemblies, tubing and pipe fittings of the system shall meet design
requirements, and continuous construction shall be guaranteed;
3 Foundation, embedded parts and preserved hole relevant to construction shall comply
with design requirements via examination;
4 Such makeshift facilities as field conditions, road, water and electricity shall satisfy
construction requirements.
3.0.7 Quality control during construction of foam extinguishing system shall be conducted
according to the following regulations:
4 Entrance Inspection
4.1 General Regulations
4.1.1 Audit trail records in construction process shall be filled according to Table B.0.2-1
in this code for entrance inspection of materials and systemic assemblies.
4.1.2 If one sample of materials and systemic assemblies is unqualified in entrance
sampling inspection, double sampling inspection shall be conducted; if unqualified sample is
still found, then this batch of products will be judged as unqualified.
4.2 Entrance Inspection of Materials
4.2.1 Entrance inspection of foam liquid shall be organized by supervision engineer,
and onsite samples shall be stored.
Inspection amount: According to required amount for overall inspection.
Inspection method: Visual inspection and inspection of effective certificates and product
ex-works conformity certificates required by the Market Access System
4.2.2 For foam liquid belonging to one of the following conditions, onsite sampling shall
be organized by supervision engineer and obtained samples shall be sent to detection unit with
corresponding qualification for detection, the results of which shall comply with relevant
current national product standards and design requirements.
1 Design dosage of 6% type low expansion foam liquid shall be no less than 7.0t;
2 Design dosage of 3% type low expansion foam liquid shall be no less than 3.5t;
3 Minimum reserve of 6% protein type medium expansion foam liquid shall be no less
than 2.5t;
4 Minimum reserve of 6% synthetic type medium expansion foam liquid shall be no less
than 2.0t;
5 Minimum reserve of high expansion foam liquid shall be no less than 1.0t;
6 Foam liquid sent for detection with onsite sample regulated in contract document.
Inspection amount: According to required amount for detection.
Inspection method: Inspection of onsite sampling, inspection report on blowing characteristics
(blowing ratio, drainage time) and extinguishment characteristics (fi...