GB 50898-2013 PDF English
US$170.00 · In stock · Download in 9 secondsGB 50898-2013: Technical Code for Water Mist Fire Extinguishing System Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB 50898-2013 | English | 170 |
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Technical Code for Water Mist Fire Extinguishing System
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GB 50898-2013: Technical Code for Water Mist Fire Extinguishing System---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GB50898-2013
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
UDC
Technical Code for Water Mist
Fire Extinguishing System
Issued on. JUNE 8, 2013
Implemented on. DECEMBER 1, 2013
Issued by. Ministry of Housing and Urban-Rural Development of the
People's Republic of China;
State Administration of Quality Supervision, Inspection and
Quarantine of the People’s Republic of China.
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
Technical Code for Water Mist
Fire Extinguishing System
Mainly drafted by.
Ministry of Public Security of the People’s Republic of China
Approved by.
Ministry of Housing and Urban-Rural Development of the
People's Republic of China
Implemented on. DECEMBER 1, 2013
Table of Contents
Foreword... 4
1 General Provisions... 8
2 Terms and Symbols... 9
3 Design... 12
4 Installation... 27
5 Acceptance... 38
6 Maintenance and Management... 44
Annex A Simulated fire Test for the Water Mist Fire Extinguishing System. 46
Annex B Project Division of the Water Mist Fire Extinguishing System... 69
Annex C Records of Quality Management and Inspection for the Construction
Site of the Water Mist Fire Extinguishing System... 70
Annex D Records of Quality Inspection of the Construction Process for the
Water Mist Fire Extinguishing System... 71
Annex E Records of Examination of Project Quality Control Data for the Water
Mist Fire Extinguishing System... 77
Annex F Records of Project Acceptance for the Water Mist Fire Extinguishing
System... 78
Annex G Inspection Items of Maintenance and Management of the Water Mist
Fire Extinguishing System... 79
Explanation of Wording in This Standard... 82
Reference Standards... 83
Technical Code for Water Mist
Fire Extinguishing System
1 General Provisions
1.0.1 This Standard was drafted in order to design the water mist fire extinguishing
system in an appropriate way, ensure its construction quality, standardize its
acceptance, maintenance and management, reduce fire hazard and protect personal
and property security.
1.0.2 This Standard applies to the design, construction, acceptance and
maintenance and management of water mist fire extinguishing system provided for
construction projects.
1.0.3 The water mist fire extinguishing system applies to the extinguishing of
combustible solid surface fire, combustible liquid fire and live equipment fire in a
relatively enclosed space.
The water mist fire extinguishing system does not apply to the extinguishing of the
following fires.
1.0.4 The design of the water mist fire extinguishing system shall be based on the
functions and fire characteristics of the protection objects; effective technical measures
shall be taken in order to make it safe and reliable, advanced and economic.
1.0.5 The design, construction, acceptance and maintenance and management of
the water mist fire extinguishing system shall be as specified in relevant national
standards.
2 Terms and Symbols
2.1 Terms
2.1.1 water mist
the water droplets of which the diameter Dv0.50 less than 200 μm and Dv0.99 less than
400 μm formed by the water sprayed by the nozzle under minimum design working
pressure on the plane 1.0 m under the nozzle axis
2.1.2 water mist fire extinguishing system
a fixed fire extinguishing system which consists of water supply unit, filter unit, control
valve, water mist nozzle and other components and water supply pipe, and is capable
of automatic and manual activation to spray water mist to extinguish fire or control fire
(hereinafter referred to as the system)
2.1.3 enclosure
a confined space which meets the system application conditions
2.2 Symbols
2.2.1 Flow rate
2.2.2 Pressure
3 Design
3.1 General Provisions
3.1.1 The products and components for the system design shall be as specified in
the current national standard, GB/T 26785, General specification for water mist fire
extinguishing system and components.
3.1.4 It is preferable to use the pump supply system for the system; the self-contained
system shall not be used for the close-type system.
3.2 Nozzle Selection and Layout
3.2.1 The nozzle selection shall meet the following provisions.
3.2.3 The nozzle layout of the open-type system shall ensure water mist is sprayed
uniformly and fully cover the enclosure, and meet the following provisions.
3.2.6 The spare nozzles shall be stored for the system in accordance with the type
and specification of the nozzles, whose quantity shall not be less than 1% of the actual
design use amount of the nozzles of the same type and specification and not less than
5 pcs each.
3.3 System Components and Pipes and Their Layout
3.3.1 The main components of the system shall be provided where it can avoid
mechanical bruise; when it is unavoidable, take measures to prevent damages such
as mechanical bruise.
3.3.5 The air release valve is preferably provided on the highest point of the close-
type system; a water testing valve shall be provided for the pipe network behind each
partition control valve; they shall meet the following provisions.
3.4.2 The mist spray intensity of the close-type system and the layout spacing and
installation height of the nozzles can be preferably determined by the simulated fire
test.
3.4.6 When the open-type system with the local application method is used to protect
a site with combustible liquid fire risks, the design parameters of the system shall be
determined in accordance with the test data obtained from the certification test
conducted by a state-authorized certification body in accordance with GB/T 26785,
General specification for water mist fire extinguishing system and components, during
the product certification test; the design parameters shall not exceed the conditions
defined for the test.
4 Installation
4.1 General Provisions
4.1.1 The system construction can be divided into 4 sub projects including receiving
inspection, system installation, system debugging and system acceptance and shall
be as specified in Annex B of this Standard.
4.1.5 The safety protection measures shall be taken during the installation process
of the system.
4.2 Receiving inspection
4.2.1 The records shall be kept for the receiving inspection of the materials and
system components in accordance with Table D.0.1 of this Standard.
4.2.2 The materials, specifications, types and quality of the pipes and fittings shall
meet the design requirements and the relevant provisions in the current national
standards GB/T 14976, Seamless stainless steel pipes for fluid transport, GB/T 12771,
Welded stainless steel pipes for liquid delivery, and GB 50235, Code for construction
of industrial metallic piping engineering.
4.2.4 The specifications, dimensions and wall thicknesses as well as tolerances of
the pipes and fittings shall meet the relevant current national product standards and
the design requirements.
4.2.6 The receiving inspection of the water mist nozzles shall meet the following
provisions.
4.3.2 The construction process records and the concealed work acceptance records
shall be kept for the installation of the system in accordance with Table D.0.2 to D.0.5
of this Standard.
4.3.3 The installation of the water storage cylinder set and gas storage cylinder set
shall meet the following provisions.
4.3.6 The installation of the pump set shall meet the following provisions in addition
to the current national standard GB 50235, Code for construction of industrial metallic
piping engineering.
4.4.9 When the system needs to be in linkage with the automatic fire alarm system,
the simulated fire signals can be used to carry out the test. Under the simulated fire
signals, the fire alarm device shall be capable of giving alarm signals, the system shall
operate, the relevant linkage control devices shall be capable of giving automatic
turnoff commands and the relevant facilities supplying combustible gas or liquid which
need to be closed during a fire shall be turned off in linkage.
Inspection quantity. complete inspection.
Inspection method. visual inspection by simulating fire signals.
4.4.10 After the debugging of the system, keep the debugging records in accordance
with Table D.0.6 of this Standard, use compressed gas or nitrogen for purging and
restore the system to a quasi-working status.
5 Acceptance
5.0.1 The acceptance of the system shall be carried out the builder, designer and
supervisor invited by the owner. After the acceptance of the system, restore the system
to the normal operating status and hand over the completion acceptance documents
and the system project acceptance records to the owner. The system shall not be used
if it is not accepted.
5.0.2 During the acceptance of the system, provide the following documents,
examine the quality control data in accordance with Annex E of this Standard and carry
out acceptance in accordance with Annex F.
5.0.5 The acceptance of the gas storage cylinder sets and water storage cylinder
sets shall meet the following provisions.
5.0.7 The acceptance of the pipe network shall meet the following provisions.
5.0.8 the acceptance of the nozzles shall meet the following provisions.
5.0.10 The cold spraying test shall be carried out for the open-type system. In
addition to the provisions in 5.0.9 of this Standard, its response time shall meet the
design requirements.
5.0.11 It shall be determined in accordance with the quality defect items whether the
system project quality acceptance is a pass or not. The system project quality defect
items shall be divided into severe defect items, general defect items and mild defect
items in accordance with Table 5.0.11.
6 Maintenance and Management
6.0.1 The user shall establish a system of maintenance and management for the
system and follow the maintenance system and operating procedures to ensure the
system remains in a normal operating status.
6.0.6 Daily inspection, monthly inspection, quarterly inspection and annual inspection
shall be carried out for the system in accordance with this Standard; the problems
spotted in the inspections shall be handled in time as specified.
6.0.7 The following items of the system shall be examined once every day.
6.0.9 The following items of the system shall be examined once each quarter.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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