GB/T 14478-2012 PDF in English
GB/T 14478-2012 (GB/T14478-2012, GBT 14478-2012, GBT14478-2012)
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Fundamental technical requirements for large and medium inlet valves of hydraulic turbine
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| GB/T 14478-1993 | English | 319 |
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Fundamental technical requirements for large and medium inlet valves of hydraulic turbine
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GB/T 14478-2012: PDF in English (GBT 14478-2012) GB/T 14478-2012
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 27.140
K 55
Replacing GB/T 14478-1993
Fundamental technical requirements for large
and medium inlet valves of hydraulic turbine
ISSUED ON. JUNE 29, 2012
IMPLEMENTED ON. NOVEMBER 01, 2012
Issued by.
General Administration of Quality Supervision, Inspection
and Quarantine of the People’s Republic of China;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 5
4 Technical requirements ... 7
5 Test ... 9
6 Installations and operation ... 11
7 Supply range of complete set ... 11
8 Acceptance and assurance ... 12
9 Nameplate, packaging, transportation and storage ... 12
Annex A ... 14
Annex B ... 16
Foreword
This Standard was drafted according to rules given by GB/T 1.1 2009.
This Standard replaces GB/T 14478-1993 “Fundamental technical requirements for large
and medium inlet valves of hydraulic turbine”. The main technical changes in this part are
as follows, compared with GB/T 14478-1993.
— Remove “and the above” in paragraph 2 of Chapter 1; it is replaced by “to 10 000
mm" and "to 5 000 mm" respectively (see Chapter 1 in this Standard; Chapter 1 in
edition 1993);
— Add the normative references (see Chapter 2 in this Standard; Chapter 2 in edition
1993);
— Modify the "resistance factor" from "0.2" to “"0.15” (see 4.5 in this Standard; 4.4 in
edition 1993);
— Add “The butterfly valve seal shall be solid shroud seal, which shall be set at the
downstream side of butterfly valve, and there shall be sufficient bearing
crush between shroud and seal seat” (see 4.9 in this Standard);
— Modify and define the lock mode of inlet valve, that is “Reliable automatic hydraulic
locking device shall be arranged at the fully closed position of inlet valve; and
manual mechanical locking device for maintenance shall be arranged at the fully
open and closed position. In principle, automatic hydraulic locking device shall not
be arranged at the fully open position of butterfly valve. However, the decision
whether setting it shall be determined according to the negotiation by supplier and
purchaser; automatic hydraulic locking device shall not be arranged at the fully
open position of ball valve.” (See 4.10 in this Standard; 4.9 in edition 1993);
— Add “Reliable locking device shall be arranged in the overhaul sealing of valve.”
(See 4.10 in this Standard);
— Add "bypass-valve switching signal" and “pressure difference signals of upstream
and downstream of valve” [see 4. 18d) and e) in this Standard]
— Add “when the inlet valve uses a separate oil pressure device in operating oil
sources, if a set of oil pressure device controls two or three sets of inlet valves, then
hydrodynamic closure of the inlet valve shall be ensured when the oil pump cannot
be started.” (See 4.16 in this Standard);
— Modify “the strength water pressure test time” from "10 min" to "30 min" (see 5.1 in
this Standard; 5.1 in edition 1993);
— Modify the coefficients in the formula for calculating the amount of leakage. The
“K=0.402”, “K=0.223” and “K=0.103” were changed to be “K=0.052”, “K=0.023” and
“K=0.004” respectively (See 5.1 in this Standard; 5.3 in edition 1993);
— Modify the reference pressure of leak test of servomotor, from "2.5 MPa" to "4 MPa"
[see 5.2b) in this Standard; 5.4 in edition 1993];
— Add recommended list of spare parts (see Annex B in this Standard).
This Standard was proposed by the China Electrical Equipment Industrial Association.
This Standard shall be under the jurisdiction of the National Hydraulic Turbine Technical
Standardization Committee (SAC/TC 175).
Drafting organizations of this Standard. DEC DONGFANG ELECTRIC MACHINERY
CO.,LTD., Chengdu Hydroelectric Investigation & Design Institute of SPC, HARBIN
ELECTRIC MACHINERY COMPANY LIMITED, and Huaneng Manwan Hydropower Plant.
Main drafters of this Standard. Lin Hongde, Jiang Dengyun, Gao Hongjun, and Wang
Wenbin.
The previous version replaced by this Standard is as follows.
- GB/T 14478-1993.
Fundamental technical requirements for large and
medium inlet valves of hydraulic turbine
1 Scope
This Standard specifies the fundamental technical requirements, model preparation
methods and others of large and medium inlet valves of hydraulic turbine.
This Standard applies to butterfly valves of which the nominal diameter of inlet valve is 1
000 mm ~ 10 000 mm, and ball valve of with the nominal diameter is 500 mm ~ 5 000 mm.
Other butterfly valves and ball valves (including storage pumps and pump turbines) can
refer to this Standard.
2 Normative references
The articles contained in the following documents have become part of this document
when they are quoted herein. For the dated documents so quoted, all the modifications
(Including all corrections) or revisions made thereafter shall be applicable to this
document.
GB 150 (All parts) Pressure vessels
GB/T 191 Packaging - Pictorial marking for handling of goods
GB/T 8564 Specification installation of hydraulic turbine generator units
GB/T 15468 Fundamental technical requirements for hydraulic turbines
GB/T 2900.45 Electrotechnical terminology - Hydroelectric power plant machinery
(GB/T 2900.45-2006, IEC/TR 61364. 1999, MOD)
GB/T 28546 Specification for package, transportation and storage of large and
medium hydraulic units
HG 4-329 Rubber Sealing Products (Circular)
ASME Volume III Section 1
3 Terms and definitions
For the purpose of this document, the following terms AND definitions defined in GB/T
2900 apply.
3.1
Nominal diameter of inlet valve
The inner diameter of through-flow at the valve-body at where the inlet valve connects
with upstream and downstream pressure water pipe flanges, the unit is millimeters (mm).
Note. If the inner diameters on both sides are different, take the smaller value.
3.2
Maximum static head
Hst
The height of waterspout that is formed between the horizontal centerline of inlet valve
and the upstream, when the inlet valve is closed, the unit is meters (m).
3.3 Maximum static pressure
Pc
The water pressure that is formed between the horizontal centerline of inlet valve and the
upstream, when the inlet valve is closed, the unit is Mega Pascal (MPa).
3.4
Maximum momentary pressure
Pm max
The maximum gauge pressure that is generated at the horizontal centerline of inlet valve
in transition process, the unit is Mega Pascal (MPa).
3.5
Design pressure
Pd
The design pressure for the flow passage components of inlet valves. It shall be equal to
the maximum momentary pressure, the unit is Mega Pascal (MPa).
The working seal and overhaul seal shall be made of stainless steel; the seal position is
required to be fit tightly.
4.10 Reliable locking device shall be arranged in the overhaul sealing of valve; manual
mechanical locking device for maintenance shall be arranged at the fully open and closed
positions.
Reliable locking device shall be set in the overhaul seal of inlet valve.
4.11 Bypass-valve or other structures with the same role shall be set in the inlet value.
Expansion joint shall be arranged for the bypass pipeline that passes through the
expansion joint of penstock. Reliable fixing measures shall be taken for bypass pipeline.
The nominal diameter of the bypass value shall be 10% of the nominal diameter of inlet
valve.
4.12 Air valve shall be arranged for inlet valve; the air valve shall be equipped with the
function of automatic intake and exhaust. The nominal diameter of air valve shall be less
than 5% to 10% of the nominal diameter of inlet valve.
4.13 Expansion joint shall be arranged for inlet valve that is constructed to facilitate
assembly and disassembly. The expansion joint seal shall not be leak after installed in
power plant.
4.14 Overhaul valves are generally set for bypass-valves and air valves.
4.15 The moving sealing ring for the inlet valve may adopt either water pressure operation
or oil pressure operation; if water pressure operation is adopted, then it shall use clean
water; and take into account the sewage discharge measures at the bottom of the sealing
ring. If oil pressure operation is adopted, then it shall ensure that the oil pressure is larger
than the water pressure in steel pipes; and consider the discharge measures of oil-water.
4.16 When oil pressure hydraulic servomotor is used for the operation of inlet valve, it
should set up oil leakage device, so as to collect the oil drained by automation elements
and the oil discharged by the hydraulic servomotor at the time of maintenance.
When inlet valves operate the oil pressure devices that adopt independent oil sources, if
one set of oi...
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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