GB/T 30092-2013 PDF in English
GB/T 30092-2013 (GB/T30092-2013, GBT 30092-2013, GBT30092-2013)
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Metal bellows compensator used in high voltage combined electrical appliance
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GB/T 30092-2013: PDF in English (GBT 30092-2013) GB/T 30092-2013
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 29.130.10
K 43
Metal bellows compensator used in high voltage combined
electrical appliance
ISSUED ON: DECEMBER 17, 2013
IMPLEMENTED ON: MAY 01, 2014
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 5
4 Product classification ... 7
5 Requirements ... 14
6 Test methods ... 21
7 Inspection rules ... 31
8 Marking, packaging and storage ... 34
Metal bellows compensator used in high voltage combined
electrical appliance
1 Scope
This Standard specifies the product classification, requirements, test methods,
inspection rules, as well as marking, packaging and storage of metal bellows
compensator used in high voltage combined electrical appliance (hereinafter referred to
as compensator).
This Standard applies to metal bellows compensator used in high voltage combined
electrical appliance.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
GB/T 1173, Casting aluminium alloy
GB/T 1222, Spring steels
GB/T 1958-2004, Geometrical product specifications (GPS) - Geometrical tolerance
- Verification prescription
GB/T 1972-2005, Disc spring
GB/T 2829-2002, Sampling procedures and tables for periodic inspection by
attributes (apply to inspection of process stability)
GB/T 3274, Hot-rolled plates, sheets and strips of carbon structural steels and high
strength low alloy structural steels
GB/T 3280, Cold rolled stainless steel plate, sheet and strip
GB/T 4237, Hot rolled stainless steel plate, sheet and strip
GB 7674-2008, Gas-insulated metal-enclosed switchgear for rated voltages of 72.5
kV and above
GB/T 8163, Seamless steel tubes for liquid service
5.4.3.1 When the bellows tubular blank is rolled with steel plate, the bellows body shall
not have circumferential welded joints. If the nominal diameter is less than or equal to
600 mm, only one longitudinal welded joint is allowed; if the nominal diameter is
greater than 600 mm, two longitudinal welded joints are allowed. The distance between
two welded joints shall be greater than 250 mm. The surface of the joint shall be free
of cracks, air holes, undercuts and misalignment. When the wall thickness of the tubular
blank is less than or equal to 1 mm, the defect grade of the welded joint in the dyeing
penetrant testing shall not be lower than grade I specified in 7.2 of JB/T 4730.5-2005.
When the wall thickness of the tubular blank is greater than 1 mm and less than 2 mm,
the defect grade of the welded joint in the radiographic testing shall be the qualified
grade specified in Appendix B of GB 16749-1997. When it is greater than or equal to 2
mm, the defect grade of the welded joint in the radiographic testing shall not be lower
than grade I specified in 5.1 of JB/T 4730.2-2005.
5.4.3.2 When the bellows is multi-layered, the positions of the longitudinal welded
joints between the tubular blanks of each layer shall be evenly staggered along the
circumferential direction when the tubular blanks are fitted together. There shall be no
water, oil, dirt and other impurities between the layers of the multi-layer bellows. The
port of the straight section of the multi-layer bellows shall be welded by fusion welding,
such as argon arc welding or resistance seam welding, so that the layers of the port are
fused as a whole.
5.4.3.3 For the welded joints of steel plate coiled pipes, the surface of the welded joints
between bellows and pipes, between bellows and flanges, and between pipes and
flanges shall be free of cracks, pores and arc craters. The welded joints of the connecting
pipe under pressure shall be subjected to partial radiographic testing, and the detection
length shall not be less than 20% of the length of each welded joint, and shall not be
less than 250 mm. The defect grade of the welded joint in the radiographic testing shall
not be lower than grade II specified in 5.1 of JB/T 4730.2-2005. The defect grade of the
dyeing penetrant testing of the circumferential welded joints between bellows and
connecting pipes, bellows and flanges, and connecting pipes and flanges shall not be
lower than grade I specified in 7.2 of JB/T 4730.5-2005.
5.4.3.4 There shall be no cracks, air holes or arc craters on the surface of the welded
joints between the connecting pipe and accessories such as stiffener plates and support
blocks.
5.4.4 Punch riveting and riveting force
The connection between the inner protective sleeve of the van stoned bellows
compensator and the bellows, as well as the cast aluminum flange shall adopt the punch
riveting technology, and the size of the riveting force shall ensure that the inner
protective sleeve does not loosen after riveting, and the cast aluminum flange shall not
burst.
5.5 Appearance
5.5.1 On the inner and outer surfaces of the bellows, there shall be no visually visible
defects such as sharp indentations, imprints, scratches, cracks, etc. that can obviously
cause stress concentration and affect the strength and service life, and there shall be no
scratches greater than the negative deviation of single-layer wall thickness. Except for
minor mold indentations.
5.5.2 The appearance shape of the bellows shall be free of visible defects such as non-
perpendicularity between the axis and the ring plane of the bellows, uneven wave
distance, and skewed corrugation.
5.5.3 The inner and outer surfaces of the bellows shall be free from visible rust spots
and scales.
5.5.4 The inner and outer surfaces of the bellows shall be free from visually visible
defects such as large water vestiges and uneven colors.
5.5.5 The longitudinal welded joint at the flange of the van stoned bellows shall be
trimmed and smooth.
5.5.6 The outer surface of the welded joint of the compensator shall be trimmed and
smooth and shall be free from burrs or sharp corners.
5.5.7 The inner surface of the compensator shall be smoothly transitioned, and the
welded joint shall be trimmed into a smooth curved surface.
5.5.8 There shall be no damage to the flange sealing surface, and the roughness of the
flange sealing surface, inner surface and outer surface shall meet the requirements of
the design drawings.
5.5.9 There shall be no welding slag and spatter on the surface of each part of the
compensator.
5.6 Painting
5.6.1 The painting environment shall be dry and clean.
5.6.2 The painted parts shall be unoiled and de-rusted.
5.6.3 The painted parts shall be evenly painted, and shall be free from defects such as
bubbles, cracks and peeling.
5.6.4 The paint used for the first time shall be subjected to a quality comparison test.
The specific requirements shall be determined through negotiation between the supplier
and the buyer.
5.7 Shear force of cast aluminum flange
5.11.3 Pressure resistance under displacement conditions (stability)
In the case of the specified displacement (rated compensation capacity under pressure),
the tightness of the compensator under the test pressure shall be guaranteed, and there
shall be no leakage and no instability. The maximum wave distance change rate of the
wave distance under the test pressure relative to the wave distance under zero pressure
shall not be greater than 15%. The test pressure is 1.5 times the design pressure.
5.12 Air tightness
5.12.1 Vacuum tightness
The compensator shall be tested for vacuum airtightness, and its ultimate vacuum shall
be less than or equal to 40 Pa.
5.12.2 Qualitative inspection of air tightness of SF6 gas
Under the design pressure, there shall be no air leakage in the compensator.
5.12.3 Leakage rate inspection of air tightness of SF6 gas
According to the provisions of 2.7 in GB/T 11023-1989 and 6.11.3 in GB 7674-2008,
the compensator is vacuumed and filled with sulfur hexafluoride gas, so that the
pressure in the sealed volume reaches the design pressure, and the relative leakage rate
of sulfur hexafluoride gas shall not exceed 0.5% per year.
5.13 Fatigue life
5.13.1 Installation compensation fatigue life
The compensator cycles under the specified equivalent axial movement (caused by the
allowable compensation capacity during installation or the short-time allowable
compensation capacity during installation). When the number of cycles is determined
through negotiation between the supplier and the buyer, it shall be marked in the design
drawing. There shall be no leakage within the specified number of cycles.
5.13.2 Temperature compensation fatigue life
The compensator cycles under the specified design pressure and equivalent axial
movement (caused by the allowable compensation capacity for thermal extension and
compression). When the number of cycles is determined through negotiation between
the supplier and the buyer, it shall be marked in the design drawing. There shall be no
leakage within the specified number of cycles.
If the design of the compensator stipulates the fatigue life requirements under different
working conditions, the test shall be carried out according to the specified pressure,
displacement and displacement cycle times respectively, and the compensator shall not
leak after the test.
5.14 Burst pressure
The compensator shall be able to withstand 3.1 times the design pressure, and ensure
sealing and no leakage.
6 Test methods
6.1 Geometric dimensions
Use a caliper with a division value of 0.02 mm or a measuring tool or instrument with
comparable accuracy for inspection. The original length can be inspected with a steel
ruler or steel tape. The inspection results shall meet the requirements of 5.4.1.
6.2 Shape and position tolerance
6.2.1 For the maximum inner diameter and minimum inner diameter of the bellows
body on any section at right angles to the axis, use a caliper with a division value of
0.02 mm or a measuring tool or instrument with comparable accuracy for inspection.
The difference between the maximum inner diameter and the smallest inner diameter
shall meet the provisions of 5.4.2.1.
6.2.2 The inspection of flatness tolerance of the sealing surface at the flange end face
on both sides of the compensator shall be carried out according to the method in Table
A.3 of GB/T 1958-2004. The result shall meet the requirements of 5.4.2.2.
6.2.3 The inspection of axiality tolerance of the flanges on both sides of the
compensator relative to the bellows shall be carried out according to the method in
Table A.11 of GB/T 1958-2004. The result shall meet the requirements of 5.4.2.3.
6.2.4 The inspection of position tolerance of the bolt holes corresponding to the flanges
on both sides of the compensator shall be carried out according to the method in Table
A.13 of GB/T 1958-2004. The result shall meet the requirements of 5.4.2.4.
6.2.5 After all components of the compensator are assembled and welded, the cross-
penetration accuracy of the bolt holes corresponding to the flanges on both sides of the
compensator shall be inspected with the help of inspection equipment, and the results
shall comply with the provisions of 5.4.2.5.
6.3 Welding
The radiographic inspection methods for longitudinal welded joints of tubular blanks
and welded joints of coiled steel pipes shall be carried out in accordance with the
provisions of Chapter 3 and Chapter 4 of JB/T 4730.2-2005.
The dyeing penetrant testing method of the longitudinal welded joints of tubular blanks,
and the circumferential welding joints between bellows and connecting pipes, bellows
and flanges, connecting pipes and flanges shall be carried out in accordance with the
provisions of Chapter 3 ~ Chapter 5 of JB/T 4730.5-2005.
The welded joints between the connecting pipe and accessories such as reinforcement
rids and support blocks shall be inspected visually.
The inspection result shall meet the requirements of 5.4.3.
6.4 Punch riveting and riveting force
Using the riveting equipment, use the strain gauge to measure the stress distribution of
the cast aluminum flange during riveting, so as to determine the riveting force. After
riveting, touch and visually inspect the tightness of the connection between the inner
protective sleeve and the bellows, the cast aluminum flange, and the surface quality of
the cast aluminum flange. The results shall meet the requirements of 5.4.4.
6.5 Appearance
6.5.1 Visual inspection of the compensator shall be carried out under standard lighting
conditions. The inspection results shall meet the requirements of 5.5.
6.5.2 The damage of the flange sealing surface shall be inspected visually, and the
roughness of the flange sealing surface, inner surface and outer surface shall be
compared with standard roughness samples, and the results shall meet the requirements
of 5.5.8.
6.6 Painting
6.6.1 The paint quality shall be inspected visually. The result shall meet the
requirements of 5.6.1, 5.6.2 and 5.6.3.
6.6.2 The paint quality comparison test method shall be determined through negotiation
between the supplier and the buyer. The result shall meet the requirements of 5.6.4.
6.7 Shear force of cast aluminum flange
Apply a concentrated load to the flange by means of a pressurizing device, and the
concentrated load applies a uniform circumferential pressure to the inner edge of the
flange through a pressurizing ring. Figure 5 is a schematic diagram of the pressurizing
device. After the pressure detection instrument shows the specified concentrated load,
keep it for 1 min, unload and take out the flange, and visually inspect the flange surface.
The measurement error of the shear force shall not be greater than 1%, and the test
results shall meet the requirements of 5.7.
Calculate the pressure stress caused by the design pressure, and the result shall meet the
requirements of 5.11.2.
6.11.3 Pressure resistance under displacement conditions (stability)
6.11.3.1 Test equipment
Hydraulic pump. Accuracy of pressure indicating instrument: no less than grade 1.5.
Special sealing fixture. To ensure the sealing of the compensator port, if there is a length
restraint mechanism, fix both ends of the test piece with the accessories of the
compensator itself; if there is no restraint mechanism, add a restraint mechanism to fix
both ends of the test piece.
Medium: water with chloride ion content not exceeding 25 mg/L.
6.11.3.2 Test method
Install the compensator in the fixture; seal and fix both ends; pressurize to the design
pressure value; then slowly pressurize to the test pressure specified in 5.11.3.
During the test, fix the bellows at the position of maximum deformation. Before
pressurizing, measure the wave distance of each wave at four evenly-distributed
positions in the circumferential direction. After pressurizing to the test pressure
specified in 5.11.3, keep the time for not less than 10 minutes; observe and judge
whether there is leakage; measure the original wave distance of each measuring point;
calculate the maximum wave distance change rate before and after pressurization,
where the result shall meet the requirements of 5.11.3. During the test, the test shall be
carried out separately at the maximum tensile displacement position and the maximum
compression displacement position specified by the nominal displacement (with
pressure compensation capacity).
The calculation method of the maximum wave distance change rate is the same as
6.11.1.2.
6.12 Air tightness
6.12.1 Vacuum air tightness test
6.12.1.1 Test equipment
Mechanical pumps or other vacuum systems; McFarland gauges or vacuum testing
instruments of comparable accuracy.
Special sealing fixture. To ensure the sealing of the compensator port, if there is a length
restraint mechanism, fix both ends of the test piece with the accessories of the
compensator itself; if there is no restraint mechanism, add a restraint mechanism to fix
both ends of the test piece.
6.12.1.2 Test method
Seal and fix the two ends of the compensator under test, and vacuumize its inner cavity.
When the vacuum degree reaches the ultimate vacuum degree specified in 5.12.1, seal
the compensator and keep it for 10 minutes; then, measure the residual vacuum degree.
The vacuum degree shall not drop by more than 2 Pa.
6.12.2 SF6 gas air tightness qualitative inspection test
6.12.2.1 Test equipment
SF6 gas filling recovery device or equivalent equipment.
SF6 gas leak detector or a SF6 gas detection instrument with equivalent function and
accuracy.
McFarland gauges or vacuum testing instruments of comparable accuracy.
Special sealing fixture. To ensure the sealing of the compensator port, if there is a length
restraint mechanism, fix both ends of the test piece with the accessories of the
compensator itself; if there is no restraint mechanism, add a restraint mechanism to fix
both ends of the test piece.
6.12.2.2 Test method
Seal and fix the two ends of the compensator under test, and vacuumize its inner cavity.
When the vacuum degree reaches the ultimate vacuum degree specified in 5.12.1, fill
in SF6 gas to the design pressure; seal the compensator; keep it for at least 5 minutes.
After the pressure holding process is completed, check with a SF6 gas leak detector,
and there shall be no leak point display. The result shall meet the requirements of 5.12.2.
6.12.3 Leakage rate inspection test of air tightness of SF6 gas
6.12.3.1 Test equipment
SF6 gas filling recovery device or equivalent equipment.
SF6 gas leak detector or a SF6 gas detection instrument with equivalent function and
accuracy.
McFarland gauges or vacuum testing instruments of comparable accuracy.
Special sealing fixture. To ensure the sealing of the compensator port, if there is a length
restraint, fix both ends of the test piece with the accessories of the compensator itself;
if there is no restraint mechanism, add a restraint mechanism to fix both ends of the test
piece.
6.12.3.2 Test method
7.2.3 Criteria and post-test processing
Those that pass the inspection are defined as qualified products; if there are unqualified
items in the inspection, the defects can be repaired. The repaired compensator needs to
be inspected again. The re-inspection shall be carried out for the unqualified items of
the previous inspection. Unqualified products shall not leave the factory.
For the rework of welded joints, it is not allowed to repair the longitudinal welded joints
of the finished bellows; the same part of the welded joints of the compensator assembly
and the welded joints of the connecting pipe can only be repaired twice.
7.3 Type inspection
7.3.1 Inspection rules
In any of the following cases, type inspection shall be carried out:
a) Before the new product is identified or finalized and put into production;
b) Before new models and specifications are put into production;
c) When the product is transferred to another factory for production;
d) When there are major changes in structure, materials, and processes after official
production that may affect product performance;
e) When the production, which is stopped for more than 18 months, is resumed.
f) When it is stipulated in the contract;
g) Every three years under normal production conditions;
h) After changes or revisions to product implementation standards;
i) When the national quality supervision department proposes a requirement to carry
out the type inspection.
7.3.2 Number of samples
The number of samples for type inspection is two finished products and one tubular
blank.
The finished products are randomly selected from the products that pass the ex-factory
inspection. The tubular blank is the same as that used for the finished bellows, just take
a single-layer tubular blank; for multi-layer bellows with different single-layer wall
thickness combinations, take a tubular blank for each wall thickness.
7.3.3 Type inspection items and sequence
See Table 6 for type inspection items and inspection sequence.
7.3.4 Judgment rules for non-conforming products
For each inspection item, if one piece is unqualified, the item is unqualified.
If there are less than two (including two) unqualified category C items or one category
B item, the type inspection shall be judged to be qualified, otherwise the type inspection
shall be judged to be unqualified.
7.3.5 Delivery of products
Samples that have passed type inspection cannot be delivered as finished products.
8 Marking, packaging and storage
8.1 Marking
8.1.1 There shall be a marking on the compensator. There shall be at least the product
name, model specification, product number, manufacturer name and date of
manufacture on the marking.
8.1.2 A certificate of conformity shall be attached to each package, and the certificate
of conformity shall be marked with:
a) name or trademark of the manufacturer;
b) product name, model specification, product number and quantity;
c) inspection date, inspector code;
d) the implemented standard number;
e) other information stipulated in the agreement between the two parties.
8.2 Packaging
8.2.1 For the sealing surface of the carbon steel flange, anti-rust treatment shall be
carried out according to the requirements of the agreement between the two parties, and
a non-metallic protective pad shall be added to the sealing surface of the flange to ensure
that it will not be damaged and rusted during storage and transportation.
8.2.2 Pull rods and nuts must be tightened to prevent deformation and damage of the
compensator.
8.2.3 The packing box shall have the words of product name, moisture-proof, rain-proof,
sender and receiver or refer to the relevant regulations in JB/T 4711.
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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