GB/T 12145-2008 (GB/T 12145-2016 Newer Version) PDF English
GB/T 12145-2008 (GB/T12145-2008, GBT 12145-2008, GBT12145-2008)
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Quality criterion of water and steam for power plant and steam-generating equipment
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| GB/T 12145-2008 | English | 85 |
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Quality criterion of water and steam for generating unit and steam power equipment
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| GB/T 12145-1999 | English | 439 |
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Quality criterion of water and steam for generating unit and steam power equipment
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| GB/T 12145-1989 | English | RFQ |
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Quality criterion of water and steam for steam power equipment
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Newer version: GB/T 12145-2016 Standards related to (historical): GB/T 12145-2016
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GB/T 12145-2008: PDF in English (GBT 12145-2008) GB/T 12145-2008
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 27.060.30
J 98
Replacing GB/T 12145-1999
Quality criterion of water and steam for generating
unit and steam power equipment
ISSUED ON: SEPTEMBER 24, 2008
IMPLEMENTED ON: AUGUST 01, 2009
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the PRC.
Substituted
Table of contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Definitions and abbreviations ... 5
4 Quality criteria of steam ... 7
5 Quality criterion of boiler feed water ... 8
6 Quality criteria of condensate ... 9
7 Quality criterion of boiler water ... 10
8 Quality criterion of boiler feed water ... 11
9 Quality criteria of desuperheated water ... 11
10 Quality criteria of dewatering and production backwater ... 11
11 Quality criterion of closed loop cooling water ... 12
12 Quality criterion of supplement water to heating network ... 12
13 Quality criterion of cooling water for water-cooled generators ... 12
14 Water-steam quality criteria for startup of shutdown (standby) unit ... 12
15 Treatment when water-steam quality deteriorates ... 14
Quality criterion of water and steam for generating
unit and steam power equipment
1 Scope
This standard specifies the water and steam quality for generating unit and
steam power equipment in the normal operation and startup of the shutdown
(standby) unit.
This standard applies to the generating unit and steam power equipment for
which the boiler main steam pressure is not less than 3.8 MPa (gauge pressure).
2 Normative references
The terms in the following documents become the terms of this standard by
reference to this standard. For dated references, the subsequent amendments
(not including errata content) or revisions do not apply to this standard. However,
parties to agreements based on this standard are encouraged to study whether
the latest versions of these documents are available. For undated references,
the latest edition applies to this standard.
GB/T 7064 Requirements for turbine type synchronous machine (GB/T
7064-2002, IEC 60034-3:1988, NEQ)
3 Definitions and abbreviations
The following definitions and abbreviations apply to this standard.
3.1
Cation Conductivity
It refers to the conductivity of the water sample as measured after subjected
to the hydrogen-type strong acid cation exchange resin treatment.
3.2
Feed water system without copper alloys
It refers to the feed water system for which the components and equipment
in contact with water and steam (excluding condensers) do not contain
copper or copper alloy materials.
3.3
Feed water system with copper alloys
It refers to the feed water system for which the components and equipment
in contact with water and steam (excluding condensers) contain copper or
copper alloy materials.
3.4
All volatile treatment (reduction); AVT (R)
It refers to the treatment of boiler feed water by adding ammonia and
hydrazine.
3.5
All volatile treatment (oxidization); AVT (O)
It refers to the treatment of boiler feed water by adding only ammonia.
3.6
Oxygenated treatment; OT
It refers to the treatment of boiler feed water by adding oxygen.
3.7
Solid alkalizing agents
It refers to such agents as phosphate and sodium hydroxide which are used
to treat the boiler water.
3.8
Alkalizing of boiler water with solid alkalizing agents
It refers to the treatment of boiler water by adding phosphate or sodium
hydroxide.
3.9
Alkalizing of the boiler water without solid alkalizing agents
11 Quality criterion of closed loop cooling water
The quality of closed loop cooling water may be controlled according to Table
11.
Table 11 -- Quality of closed loop cooling water
Material Material Conductivity (25 °C) / (μS/cm) pH (25 °C)
Total iron system ≤ 30 ≥ 9.5
Copper-containing system ≤ 20 8.0 ~ 9.2
12 Quality criterion of supplement water to heating
network
The quality of supplement water to heating network is controlled according to
Table 12.
Table 12 -- Quality of supplement water to heating network
Dissolved Oxygen / (μg/L) Total Hardness / (μmol/L) Suspension / (mg/L)
< 100 < 600 < 5
13 Quality criterion of cooling water for water-cooled
generators
Refer to GB/T 7064, the cooling water’s quality of the water-cooled generator
is controlled according to Table 13.
Table 13 -- Quality of cooling water for water-cooled generators
Conductivity (25 °C) / (μS/cm) Copper / (μg/L) Hardness / (μmol/L) pH (25 °C)
≤ 5a ≤ 40 ≤ 2 7.0 ~ 9.0
a When the stator winding of the turbo generator is in an independent closed circulating water system, the conductivity
of the cooling water shall be less than 2.0 μS/cm.
14 Water-steam quality criteria for startup of shutdown
(standby) unit
14.1 After the boiler is started, the steam quality before the steam parallelizing
or impulse startup of steam turbine may be controlled according to the
15 Treatment when water-steam quality deteriorates
15.1 When the water-steam quality deteriorates, it shall immediately check the
representativeness of the sampling and the accuracy of the test results;
comprehensively analyze the mass change of water-steam in the system. After
confirming that the judgment is correct, use the following three-level processing
principles to deal with it:
● Primary treatment - There is the possibility of corrosion, scaling and salt
accumulation due to impurities; it shall be restored to the corresponding
standard value within 72 h;
●Secondary treatment - There must be corrosion, scaling and salt
accumulation due to impurities; it shall be restored to the corresponding
standard value within 24 h;
● Third-level treatment - The rapid corrosion, scaling or salt accumulation are
occurring. If the water quality does not improve within 4 h, it shall shutdown
the boiler.
In each stage of exception handling, if it is not possible to return to normal within
the specified time, it shall use a higher level of treatment method.
15.2 The treatment value of the condensate (condensation pump’s outlet) when
the water quality is abnormal is as shown in Table 17.
Table 17 -- Treatment for abnormality of condensate water quality
Item Standard value
Treatment level
Primary Secondary Third level
Hydrogen
conductivity (25 °C) /
(μS/cm)
With fine treatment
demineralization ≤ 0.30
a > 0.30 a - -
Without fine treatment
demineralization ≤ 0.30 > 0.30 > 0.40 > 0.65
Sodium / (μg/Lb)
With fine treatment
demineralization ≤ 10 > 10 - -
Without fine treatment
demineralization ≤ 5 > 5 > 10 > 20
a The direct steam boiler with a main steam pressure greater than 18.3 MPa, the standard value of condensate’s
hydrogen conductivity is not more than 0.20 μS/cm, the first-stage treatment is more than 0.20 μS/cm.
b Power plants cooled with seawater shall be shut down when the sodium content in the condensate is more than 400
μg/L.
15.3 The treatment values when the boiler feed water’s quality is abnormal are
as shown in Table 18.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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