This specification is applicable to the carbon steel and alloy steel welded spherical tanks with a design pressure greater than or equal to 0.1MPa and not greater than 4MPa and a nominal volume greater than or equal to 50m3, which are orange-shaped or mixed type and supported by pillars. This specification is not applicable to the following spherical tanks: (1) Spherical tanks exposed to nuclear radiation; (2) Non-fixed spherical tanks (such as those mounted on vehicles or ships); (3) Spherical tanks with double-layer structures; (4) Spherical tanks requiring fatigue analysis; (5) Spherical tanks formed by expansion. GB 50094-1998 Spherical Storage Tank Construction and Acceptance Specification GB50094-1998 Standard Download Decompression Password: www.bzxz.net

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National Standard of the People's Republic of China
GB50094-98
Code for construction and
acceptance of spherical tanks
1998-05-06
1998-12-01
State Bureau of Technical Supervision
Ministry of Construction of the People's Republic of China
Engineering Construction Standard Full-text Information System
Jointly Issued
Engineering Construction Standard Full-text Information System
National Standard of the People's Republic of China
Code for construction and
acceptance of spherical tanks tanksGB
50094-98
Editor: China National Petroleum CorporationApproval department: Ministry of Construction of the People's Republic of ChinaEffective date: December 1, 1998
1998Beijing
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Notice on the release of the national standard
"Specification for the construction and acceptance of spherical storage tanks"Jianbiao [1998] No. 99
According to the requirements of the State Planning Commission's document [1993] No. 110, the "Specification for the construction and acceptance of spherical storage tanks" revised by China National Petroleum Corporation and relevant departments has been reviewed by relevant departments. The "Specification for the construction and acceptance of spherical storage tanks" GB50094-98 is now approved as a mandatory national standard and will be implemented from December 1, 1998. 94-86 will be abolished at the same time.
Original national standard "Spherical storage tank construction and acceptance specification" GBJ This specification is managed by China National Petroleum Corporation, and the specific interpretation and other work is undertaken by the Engineering Technology Research Institute of China National Petroleum Corporation, and the publication and distribution is organized by the Standard and Quota Research Institute of the Ministry of Construction.
Ministry of Construction of the People's Republic of China
May 6, 1998
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Inspection and acceptance of parts
2.1 Inspection of parts quality certificates
22 Inspection of spherical shell plates and test plates
.． Pillar inspection
Inspection of welded parts………………………900000000004
Painting, packaging and transportation inspection of parts
On-site assembly
Basic inspection and acceptance
3.2 Spherical tank assembly
Installation of parts
General provisions
Welding process assessment
Selection of welding materials and on-site management
Welding construction
Dimensional inspection of spherical tank after welding
Weld seam inspection
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Appearance inspection of welds
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Qualification of non-destructive testing personnel
5.3 Radiographic and ultrasonic testing||tt ||Magnetic particle testing and penetration testing
Overall heat treatment after welding
General provisions
6.2 Heat treatment process
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6.3 Insulation requirements
6. Temperature measurement system...
6.5 Column foot treatment
Product welding test plate
7.1 Preparation requirements for product welding test plate
7.2 Preparation and testing of test specimens
8 Pressure test and air tightness test
8.． Pressure test
8.2 Air tightness test
Completion acceptance
Appendix A
Appendix B
Appendix C
Appendix D
Cryogenic spherical storage tank
General provisions
Inspection and acceptance of spherical shell plate
Overall heat treatment after welding
Product test plate
Weld inspection·
Pressure test·
Spherical tank Names of various parts and numbers of belts, shell plates and welds of spherical tanks
Acceptance form
Terms used in this specification
Additional explanation
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Engineering construction standard full text information system
1.0.1 This specification is formulated to make spherical storage tanks (hereinafter referred to as "spherical tanks") technologically advanced, economically reasonable, safe and applicable, and ensure quality during on-site construction. 1.0.2
This specification is applicable to orange-segment or mixed-type carbon steel and alloy steel welded spherical tanks supported by pillars with a design pressure greater than or equal to 0.MPa and not greater than 4MPa and a nominal volume greater than or equal to 50m3. This specification does not apply to the following spherical tanks:
(1) Spherical tanks exposed to nuclear radiation;
(2) Non-fixed (such as vehicle-mounted or ship-mounted) spherical tanks;(3) Double-layer spherical tanks;
(4) Spherical tanks requiring fatigue analysis;
(5) Spherical tanks formed by expansion.
1.0.3 The construction and acceptance of spherical tanks shall include the following scope:1.0.3.1 The spherical shell and the pressure-bearing parts connected to it shall be defined within the following scope:(1) The first circumferential weld of the spherical tank pipe and the external pipeline;(2) The first threaded joint of the spherical tank pipe and the external pipeline;(3) The first flange sealing surface of the spherical tank pipe and the external pipeline flange connection. 1.0.3.2
The pressure-bearing head, flat cover and fasteners of the spherical tank opening. 1.0.3.3 Non-pressure-bearing components such as pillars, tie rods, pads and bottom plates connected to the spherical shell. 1.0.4 For spherical tanks with a design temperature lower than or equal to -20°C, the provisions of Appendix A of this Code shall apply. www.bzxz.net
1.0.5 The construction unit of the spherical tank must have a spherical pressure vessel on-site welding qualification certificate issued by the labor department.
1.0.6 Before installing the spherical tank, the construction unit must notify the provincial and municipal labor departments where the spherical tank user or installation unit is located, and report to the inspection unit authorized by the provincial labor department boiler pressure vessel safety supervision agency, and accept the on-site supervision and inspection conducted by it.
7 The spherical tank shall be constructed according to the design drawings. When the design needs to be modified, the consent of the original design unit must be obtained and the design modification document must be signed. 3 In addition to complying with this code, the construction and acceptance of the spherical tank shall also comply with the provisions of the current national standards and specifications.

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2 Inspection and Acceptance of Components
2.1 Inspection of Component Quality Certificates
The construction unit shall inspect the technical quality documents such as product quality certificates provided by the manufacturer.
2.1.2 The factory certificates of the spherical shell plates, manholes, pipes, flanges, reinforcements, pillars and tie rods of the spherical tank shall include the following contents: (1) Factory certificate of parts;
(2) Product inspection report issued by the labor department inspection agency; (3) Material substitution approval certificate;
(4) Material quality certificate and relevant re-inspection report; (5) Non-destructive testing report of steel plates, forgings and parts; (6) Ultrasonic testing report of the periphery of the spherical shell plates; (7) Non-destructive testing report of grooves and welds (including inspection location map); (8) Inspection report of hot press forming test plates;
(9) Product welding test plate test report.
2.2 Inspection of spherical shell plates and test plates
2.2.1 The structural type of the spherical shell shall comply with the requirements of the design drawings. Each spherical shell plate shall not be spliced.
2 The spherical shell plates provided by the manufacturer shall not have defects such as cracks, bubbles, scars, folds and inclusions. 2.2.2
If the above defects exist, they shall be repaired in accordance with the provisions of Section 4.5 of this Code. 2.2.3 The thickness of the spherical shell plates shall be spot checked, and the measured thickness shall not be less than the nominal thickness minus the negative deviation of the steel plate. The number of spot checks shall be 20% of the number of spherical shell plates, and each belt shall not be less than 2 pieces, and the upper and lower poles shall not be less than 1 piece; each spherical shell plate shall be inspected at no less than 5 points. If there are any unqualified results in the spot check, the spot check shall be doubled. If there are still unqualified results, the spherical shell plates shall be checked one by one.
2.2.4 The outer dimensions of the spherical shell plate shall meet the following requirements: 2.2.4.1 The template used for the curvature inspection of the spherical shell plate and the allowable clearance between the spherical shell plate and the template shall meet the requirements of Table 2.2.4-1 (Figure 2.2.4-1). Template and allowable clearance between the spherical shell plate and the template
Spherical shell plate chord length
Template chord length
Same as spherical shell plate chord length
Table 2.2.4-1
Allowable clearance
Figure 2.2.4-1 Spherical shell plate curvature inspection (unit: mm) 1-Template; 2-Spherical shell plate
2.2.4.2 The allowable deviation of the geometric dimensions of the spherical shell plate shall meet the requirements of Table 2.2.4-2 (Figure 2.2.4-2).
2.2.5 The weld groove of the spherical shell plate shall meet the following requirements: 2.2.5.1 The surface quality of the gas-cut groove shall meet the following requirements: (1) The flatness shall be less than or equal to 0.04 times the nominal thickness (8) of the spherical shell plate and shall not be greater than 1 mm.
(2) The surface should be smooth, and the surface roughness (R.) should be less than or equal to 25um (3) The limit spacing between defects (Q) should be greater than or equal to 0.5m; Engineering 4 Construction Standard Full Text Information System
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Allowable deviation of geometric dimensions of spherical shell plate
Chord length in length direction Li, L, Ls
Chord length in any width direction B1, Bz, Bs
Diagonal chord length D
Distance between two diagonals
Table 2.2.4-2
Allowable deviation (mm)
Note: For spherical shell plates with poor rigidity, the arc length can be checked. Its allowable deviation should comply with the provisions of the first 3 items in the table. (4) Slag and oxide scale should be cleaned, and there should be no defects such as cracks and delamination on the groove surface. For spherical shell plates made of steel with a standard tensile strength greater than 540MPa, the groove surface shall be randomly inspected by magnetic particle or penetrant testing, and there shall be no defects such as cracks, delamination and slag inclusions. The number of random inspections shall be 20% of the number of spherical shell plates. If any unacceptable defects are found, the random inspection shall be doubled; if there are still unacceptable defects, each piece shall be inspected. 2.2.5.2 The allowable deviation of the groove geometric dimensions shall comply with the following requirements (Figure 2.2.5): (1) The allowable deviation of the groove angle (α) is ±2°30°; (2) The allowable deviation of the groove blunt edge (P) and groove depth (h) is ±1.5mm. 2.2.6 The full area of ​​the spherical shell plate within 100mm of the periphery shall be subjected to full-area ultrasonic inspection and random inspection. The number of random inspections shall not be less than 20% of the total number of spherical shell plates, and each strip shall not be less than 2 pieces, and the upper and lower poles shall not be less than 1 piece; if there is a requirement for ultrasonic inspection of the spherical shell plate, ultrasonic inspection and random inspection shall also be carried out, and the number of random inspections shall be the same as the number of random inspections of the periphery. The test methods and results shall comply with the provisions of the current national standard "Nondestructive Testing of Pressure Vessels" JB4730, and the qualified level shall comply with the requirements of the design drawings. If there are unacceptable defects, double spot checks shall be conducted. If there are still unacceptable defects, each piece shall be tested.
2.2.7 When the thickness difference between adjacent plates is greater than or equal to 3mm or greater than 1/4 of the thickness of the thin plate, the edge of the thick plate shall be beveled (Figure 2.2.7), and the thickness of the end after beveling shall be equal to the thickness of the thin plate.
2.2.8 The manufacturing unit shall provide no less than 6 product welding test plates and test plates required for welding process assessment for each spherical tank, and the base size shall be 180mm×650mm. The material of the test plate engineering construction standard full text information system
engineering construction standard full text information system
should be qualified, and shall have the same steel grade and thickness as the spherical shell plate, and the groove type of the product welding test plate shall be the same as that of the spherical shell plate. B*+2
Spherical shell plate geometric dimension inspection (unit: mm) Figure 2.2.4-2
Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
Figure 2.2.5 Spherical shell plate groove geometric dimension inspection (unit: mm) Figure 2.2.7 Requirements for thick plate thinning when welding spherical shell plates of different thicknesses. 2.3 Pillar inspection
The allowable deviation of the full length of the pillar is 3mm.
The pillar and the bottom plate should be kept vertical after welding, and the allowable deviation of the verticality is 2mm (Figure 2.3.2).
Figure 2.3.2 Pillar and bottom plate verticality deviation inspection (unit: mm) Engineering Construction Standard Full-text Information System
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