SH/T 3537-2009 English PDF (SHT3537-2009)

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SH/T 3537-2009: Technical specification for construction of vertical cylindrical low temperature storage tank
SH/T 3537-2009
SH
PETROCHEMICAL INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 75.200
P 72
Filing No.: J1019-2010
Replacing SH 3537-2002
Technical specification for construction of vertical
cylindrical low temperature storage tank
ISSUED ON: DECEMBER 04, 2009
IMPLEMENTED ON: JUNE 01, 2010
Issued by: Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword ... 4
1 Scope ... 6
2 Normative references ... 6
3 General provisions ... 7
4 Construction preparation ... 8
4.1 Technical preparation ... 8
4.2 Site preparation ... 9
5 Materials ... 9
6 Construction process ... 10
7 Prefabrication ... 11
7.1 General requirements ... 11
7.2 Base plate prefabrication ... 12
7.3 Wall plate prefabrication ... 15
7.4 Vault prefabrication ... 16
7.5 Prefabrication of inner suspension roof ... 18
7.6 Prefabrication of other components ... 19
7.7 Exit-factory of prefabricated parts ... 19
8 Review of foundation and reinforced concrete outer tank ... 20
8.1 Foundation review ... 20
8.2 Re-examination of reinforced concrete outer tank ... 21
9 Tank bottom assembly ... 22
9.1 General requirements ... 22
9.2 Assembly of tank bottom plate with overlap joints ... 23
9.3 Assembly of butt joint tank bottom plate ... 24
9.4 Assembly of inner tank bottom of double-layer low-temperature storage tank ... 25
10 Tank wall assembly ... 26
10.1 General requirements ... 26
10.2 Determination of datum circle ... 27
10.3 Wall plate assembly ... 27
10.4 Installation of moisture-proof plate for double-layer low-temperature storage tanks
whose outer tank is reinforced concrete structure ... 34
11 Tank top assembly ... 35
11.1 Center frame method ... 35
11.2 Air lift method ... 36
12 Accessory installation ... 40
12.1 Tank opening and connecting pipe installation ... 40
12.2 Anchor installation ... 40
12.3 Installation of other accessories ... 41
13 Welding ... 41
13.1 General provisions ... 41
13.2 Welding procedure qualification ... 42
13.3 Welding consumables management ... 43
13.4 Welding requirements ... 43
13.5 Welding sequence and method ... 44
13.6 Repair... 46
14 Cold insulation ... 47
14.1 General requirements ... 47
14.2 Cold insulation at tank bottom ... 47
14.3 Tank wall cold insulation ... 49
14.4 Cold preservation of pipelines in the tank ... 50
14.5 Cold insulation of inner suspension roof ... 50
15 Inspection and testing ... 51
15.1 Visual inspection of welded joints ... 51
15.2 Non-destructive testing and tightness test of weld joints ... 51
15.3 Inspection of tank geometry and dimensions ... 54
15.4 Tank test ... 54
16 Construction process technical documents and handover acceptance ... 57
Appendix A (Informative) Several typical structures of low-temperature storage tanks
... 59
Appendix B (Informative) Construction process flow ... 63
Explanation of wording in this code ... 68
Technical specification for construction of vertical
cylindrical low temperature storage tank
1 Scope
This Specification gives the construction process and construction methods of vertical
cylindrical low-temperature storage tanks (hereinafter referred to as low-temperature
storage tanks); specifies the process control, quality standards, inspection, testing of
prefabrication, assembly, welding, cold preservation.
This Specification is applicable to the construction and acceptance of low-temperature
storage tanks, which have a nominal volume greater than or equal to 10000 m3 and a
design temperature not higher than -45 °C and not lower than -168 °C. Low-temperature
storage tanks, which have a nominal volume of less than 10000 m3, can make reference
to this Specification.
This Specification is applicable to the construction of low-alloy steel and alloy steel
low-temperature storage tanks. Stainless steel low-temperature storage tanks can make
reference to this Specification.
This Specification does not apply to the outer tank part of reinforced concrete.
2 Normative references
The provisions in following documents become the provisions of this Standard through
reference in this Standard. For the dated references, the subsequent amendments
(excluding corrections) or revisions do not apply to this Standard; however, parties who
reach an agreement based on this Standard are encouraged to study if the latest versions
of these documents are applicable. For undated references, the latest edition of the
referenced document applies.
GB 985 Basic forms and sizes of weld grooves for gas welding, manual welding and
gas-shielded welding
GB 986 Basic forms and sizes of weld grooves
GB 50236 Code for construction and acceptance of field equipment, industrial pipe
welding engineering
JB 4708 Welding procedure qualification for steel pressure vessels - Welding
specification for steel pressure vessels - Mechanical proper ty tests of product
accordance with GB 50236. Welders engaged in low-temperature steel welding shall
undergo skill assessment, before taking up their posts.
3.4 The non-destructive testing personnel engaged in low-temperature storage tanks
shall obtain qualification certificates, which are suitable for their work, in accordance
with the "Rules on Management of Special Equipment Nondestructive Testing
Personnel Assessment and Supervision".
3.5 The construction safety technology and labor protection of low-temperature storage
tanks shall be implemented, in accordance with the provisions of SH 3505.
3.6 Refer to Appendix A, for typical structures of single-layer low-temperature storage
tanks, steel double-layer low-temperature storage tanks, double-layer low-temperature
storage tanks with reinforced concrete outer tanks.
4 Construction preparation
4.1 Technical preparation
4.1.1 The low-temperature storage tank shall have the following technical documents,
before construction:
a) Design documents;
b) Quality certification documents for materials and accessories;
c) Construction technical documents;
d) Welding procedure qualification report and welding operation instructions;
e) Relevant standard specifications.
4.1.2 Check the drawings, including:
a) Applicability of standard specifications;
b) The connection between the general assembly drawing and the parts drawing, as
well as the elevation, orientation, main dimensions, etc.;
c) Construction feasibility of the equipment structure;
d) Connection between equipment drawings and trade drawings such as civil
engineering and technology;
e) Requirements for inspection and testing.
4.1.3 Refer to design disclosure.
4.1.4 Conduct technical disclosure, including project characteristics, schedule,
construction technology, quality standards, safety and technical labor protection
measures, etc.
4.2 Site preparation
4.2.1 Arrange the construction site according to the construction layout drawing. The
water, electricity, roads are unimpeded and meet the following requirements:
a) The site is flat; there shall be no low-lying water accumulation around the tank
foundation;
b) The road shall meet the travel requirements of transportation and hoisting vehicles;
c) Material storage facilities shall meet the requirements of construction technical
documents.
4.2.2 Provide the construction machinery, tooling facilities, measuring instruments,
samples, etc. that meet the requirements for on-site assembly. Measuring instrumen...