CJJ 33-1989 Specification for Construction and Acceptance of Urban Gas Transmission and Distribution Projects CJJ33-89 CJJ33-1989 Standard download decompression password: www.bzxz.net

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Industry Standard of the People's Republic of China
Urban Gas Transmission and Distribution Project
Construction and Acceptance Specification
CJJ33—89
Engineering Construction Standard Full-text Information System
Engineering Construction Standard Full-text Information System
Industry Standard of the People's Republic of China
Urban Gas Transmission and Distribution Project Construction and Acceptance Specification CJJ33—89
Editor: Urban Construction Research Institute of the Ministry of Construction Approval Department: People's Republic of China Ministry of Construction of the People's Republic of China Implementation Date: June 1, 1990
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Chapter 1 General Provisions
Chapter 2 Earthwork
Section 1 General Provisions
Section 2 Grooving
Section 3 Backfill
Chapter 3 Performance and Inspection of Materials
General Provisions
Section 1
Section 2 Steel Pipes and Steel Pipe Fittings| |tt||Section 3 Cast Iron Pipes and Cast Iron Pipe Fittings
Section 4 Cast Iron Pipe Interface Materials
Chapter 4 Pipeline and Ancillary Equipment Installation
Section 1
Section 2
Section 3
Section 4
Section 5
General Provisions
Steel Pipeline Installation
Cast Iron Pipe Installation
Pipeline Passing (Spanning)
Ancillary Equipment Installation
Chapter 5 Anti-corrosion of Steel Pipelines
Section 1
General Provisions Definition
Section 2 Petroleum asphalt anti-corrosion insulating coating
Section 3 Epoxy coal tar anti-corrosion insulating coating Section 4 Cathodic protection (sacrificial anode method) Chapter 6 Storage, distribution and voltage regulation
Section 1
General provisions
Section 2 Storage and distribution station
Section 3 Voltage regulating facilities
Chapter 7 Testing and acceptance
Section 1
General provisions
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Section 2． Strength test
Section 3 Air tightness test
Section 4 Acceptance·
Requirements for construction of petroleum asphalt coating
Appendix—
.心.心心.
Requirements for construction of epoxy coal tar coating
Appendix 2
Appendix 3
Appendix 4
Requirements for construction of magnesium anode
.............
Explanation of terms used in this specification.
Additional explanation
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Main symbols
Groove bottom width (m)
Groove top width (m)
Groove depth (m)
Groove slope rate
——Permissible pressure drop (Pa)
Measured pressure drop (Pa)
B1, B2
D1.D2.-D.
did2**-d.
Li, L·L
ti, t2
Barometer readings at the beginning and end of the test (Pa) Pressure gauge readings at the beginning and end of the test ((Pa) Outer diameter of pipe section (m)
Inner diameter of pipe section (m)
Outer diameter of each pipe (m)|| tt||Inner diameter of each pipe section (m)
Length of each pipe section (m)
Test time (h)
Temperature inside the pipe at the beginning and end of the test (℃) Leakage detection voltage (V)
Coating thickness (mm)
Design clearance between two pipes (m)
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Chapter 1 General
Article 1.0.1 This specification is specially formulated to guide the construction and acceptance of urban gas transmission and distribution projects and ensure safe gas supply. Article 1.0.2 This specification applies to the construction and renovation of urban gas (excluding liquefied petroleum gas in liquid form) transmission and distribution projects with a pressure not exceeding 0.8MPa (8kgf/cm2) Construction and acceptance of new or expanded construction. Article 1.0.3 Any unit that carries out the construction of urban gas transmission and distribution projects must have a construction permit approved or recognized by the local competent authorities. Article 1.0.4 The construction of urban gas transmission and distribution projects shall be carried out in accordance with the basic construction procedures, and the following conditions shall be met before construction can begin:
1. The design and other technical documents are complete, and the construction drawings have been reviewed; 2. The construction plan has been approved, and the technical briefing and necessary technical training have been completed;
3. Materials, labor, and machinery are basically complete, the construction site environment meets the requirements, and the water, electricity, gas, etc. for construction can meet the needs, and continuous construction can be guaranteed. Article 1.0.5 The construction of urban gas transmission and distribution projects shall be carried out according to the design, and the modification of the design or the substitution of materials shall be approved by the original design department. Article 1.0.6 The safety technology and labor protection of the construction and inspection of urban gas transmission and distribution projects shall be implemented in accordance with relevant regulations.
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Chapter II Earthwork
Section I General Provisions
Article 2.1.1 The construction unit shall make all preparations before trench excavation and jointly check the data of underground pipelines and structures with the construction, design and other relevant units, and dig test pits for verification when necessary. Article 2.1.2 In the construction area, existing buildings and structures, roads, ditches, pipelines, electric poles, trees, etc. that hinder construction shall be handled by the construction unit and relevant units in consultation before construction.
Article 2.1.3 The trench must be laid out according to the design drawings. Article 2.1.4 When constructing in areas with high groundwater levels or in the rainy season, measures should be taken to lower the water level or drain water to promptly remove the water in the trench. Section 2 Grooving
Article 2.2.1 The pipeline trench shall be excavated according to the plane position and elevation specified in the design. When excavated manually and without groundwater, the trench bottom reserve value should be 0.05-0.10m; when excavated mechanically or with groundwater, the trench bottom reserve value should not be less than 0.15m. Before installing the pipeline, the bottom should be manually cleaned to the designed elevation.
Article 2.2.2 The width of the trench bottom should meet the following requirements: 1. Cast iron pipes and steel pipes (single pipe trench bottom assembly) should comply with the provisions of Table 2.2.2: Trench bottom width size
Nominal diameter of pipe
Trench bottom width
100~250~400~wwW.bzxz.Net
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500~700~
900~1100~
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2. Steel pipe (single pipe trench side assembly) can be calculated as follows: a=D+0 .3
3. The steel pipe (two pipes laid in the same trench) can be calculated according to the following formula: a=D1+D2+8+c
- Trench bottom width (m);
- Pipe outer diameter (m);
- First pipe outer diameter (m);
D2--Second pipe outer diameter (m);
- Designed clear distance between the two pipes (m):
(2.2.2-1)
(2.2.2-2)
- Working width, when assembled at the trench bottom, c=0.6, when assembled at the trench edge, c=0.3(m).
Article 2.2.3 The upper width of the trapezoidal trench (as shown in Figure 2.2.3) can be determined by the following formula:
Figure 2.2.3 Cross section of trapezoidal trench
b=a+2nh
Wherein b——the upper width of the trench (m);
——the bottom width of the trench (determined according to Table 2.2.2) (m); (2.2.3)
——the slope rate of the trench (the ratio of the horizontal projection of the slope to the vertical projection n
value);
h——the depth of the trench (m).
Article 2.2.4 When trenches are excavated in natural moisture soil without groundwater, if the trench depth does not exceed the following provisions, the trench wall may not be provided with a slope. 1m;
1. Compacted sand and gravel soil
2. Sub-sand and sub-clay
3. Clay
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4. Particularly dense soil
Article 2.2.5 For trenches with natural moisture, uniform structure, no groundwater, good hydrogeological conditions, and a depth of less than 5m and without support, the slope gradient can be based on Table 2.2.5 Determine.
Maximum side slope of trenches with a depth of less than 5m (without support) Table 2.2.5 Side
Soil name
Sub-sand
Sub-clay
Gravel soil Pebble soil
Peat rock Chalk
Loess soil
Manual excavation and throwing soil
on the side of the trench
Excavating soil at the bottom of the trench
(1 +n)
Excavating soil at the side of the trench
Note: ①If manual excavation does not throw the soil on the top of the trench and is transported away at any time, the slope of mechanical excavation at the bottom of the trench can be used.
②The height of the abandoned soil pile should not exceed 1.5m. When the soil is piled against the wall of the house, its height is required not to exceed 1/3 of the wall height. There should be a safe distance between the abandoned soil and the trench side. Article 2.2.6 When the requirements of Article 2.2.5 cannot be met, the trench wall shall be reinforced with support. Continuous support shall be provided for loose soil, and the support shall be of sufficient strength.
Article 2.2.7 The partially over-excavated part shall be backfilled and compacted. When there is no groundwater at the bottom of the trench, if the over-excavation is within 0.15m, the original soil may be backfilled and compacted, and its density shall not be lower than that of the original foundation natural soil. If the over-excavation is more than 0.15m, lime soil or sand may be used, and its density shall not be lower than 95%. When there is groundwater at the bottom of the trench or the soil layer at the bottom of the trench has a high water content, natural sand may be used for backfilling. Article 2.2.8 For excavation in collapsible loess areas, it is not advisable to construct in the rainy season, or to effectively remove the water in the ditch during construction. During excavation, a 0.03-0.06m thick soil layer should be reserved at the bottom of the ditch for compaction. After compaction, the dry bulk density of the surface soil at the bottom of the ditch is generally not less than 1.6×10°kg/m. Article 2.2.9 When there are old and abandoned structures, hard stones, wood, garbage and other debris at the bottom of the ditch, they must be removed, and then a layer of sand or plain soil with a thickness of not less than 0.15m should be laid and leveled and compacted. Article 2.2.10 For weak pipe foundations and special corrosive soils, they should be treated according to the design requirements.
Section 3 Backfill
Article 2.3.1 When backfilling the trench, the bottom of the pipe should be filled first, and then both sides of the pipe should be filled at the same time, and then backfilled to 0.5m above the top of the pipe (uninspected interfaces should be left out). If there is water in the trench, it must be completely drained before backfilling. The unfilled part of the trench should be backfilled in time after the pipeline is inspected and qualified. Article 2.3.2 The support of the trench should be removed in sequence according to the backfill progress while ensuring construction safety. After the vertical sheet piles are removed, the gaps should be filled with sand. Article 2.3.3 The backfill soil on both sides of the pipeline and within 0.5m above the top of the pipe shall not contain debris such as gravel, bricks, garbage, etc. Frozen soil shall not be used for backfilling. A small amount of stones with a diameter of no more than 0.1m are allowed in the backfill soil more than 0.5m from the top of the pipe. Article 2.3.4 The backfill soil shall be compacted layer by layer, with each layer thickness of 0.2 to 0.3 m. The backfill soil on both sides of the pipeline and within 0.5 m above the top of the pipe must be compacted manually. When the backfill soil exceeds 0.5 m above the top of the pipe, a small machine can be used for compaction, and the thickness of each loose soil layer is 0.25 to 0.4 m.
Article 2.3.5 The backfill soil shall be checked for compactness layer by layer. The density of each part of the trench shall meet the following requirements (see Figure 2.3.5): III
Cross section of backfill soil
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1. Chest fill (1) 95%
2. Within 0.5m above the top of the pipe
85%;
():
3. From 0.5m above the top of the pipe to the ground (III): 1. Trench within urban area 95%;
2. Cultivated land 90%.
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Engineering Construction Standard Full Text Information System
Chapter III Performance and Inspection of Materials
Section I General Provisions
Article 3.1.1 The pipes, pipe fittings, pipeline accessories and sealing packing used in gas transmission and distribution projects shall comply with the relevant national standards in force. All non-standard products shall be subject to performance tests or inspections in accordance with the corresponding standards. Article 3.1.2 Pipes, pipe fittings, pipeline accessories and other materials shall be provided with factory certificates. If there is no certificate, they shall be inspected and tested and only used after being proved to be qualified. Section 2 Steel Pipes and Steel Pipe Fittings
Article 3.2.1 The performance and inspection of steel pipes used in gas transmission and distribution projects shall comply with the requirements of the following national current standards: 1. GB3091 "Galvanized welded steel pipes for low-pressure fluid transportation"; 2. GB3092 "Welded steel pipes for low-pressure fluid transportation"; 3. YB231 "Seamless steel pipe";
4. SY5036 "Spiral welded submerged arc welded steel pipes for pressure fluid transportation"; 5. SY5037 "Spiral seam submerged arc welded steel pipes for general low-pressure fluid transportation", 6. SY5038 "Spiral seam high-frequency welded steel pipes for pressure fluid transportation"; 7. SY5039 "Spiral seam high-frequency welded steel pipes for general low-pressure fluid transportation"; 8. Steel pipes and steel pipe fittings with working temperatures below -20°C should have low-temperature impact toughness test results, otherwise they should be tested according to the requirements of YB19 "Metal Low-temperature Impact Toughness Test Method", and their indicators shall not be lower than the lower limit of the specified value. Section 3 Cast Iron Pipes and Cast Iron Fittings
Article 3.3.1 The performance and inspection of cast iron pipes and cast iron fittings shall comply with the requirements of the following current national standards:
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Backfill cross section
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1. Chest fill (1) 95%
2. Within 0.5m above the top of the pipe
85%;
()):
3. From 0.5m above the top of the pipe to the ground (III): 1. Ditches within the urban area 95%;
2. Cultivated land 90%.
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Chapter III Performance and Inspection of Materials
Section I General Provisions
Article 3.1.1 The pipes, pipe fittings, pipeline accessories and sealing packing used in gas transmission and distribution projects shall comply with the relevant national standards in force. All non-standard products shall be subject to performance tests or inspections in accordance with the corresponding standards. Article 3.1.2 Pipes, pipe fittings, pipeline accessories and other materials shall be provided with factory certificates. If there is no certificate, they shall be inspected and tested and only used after being proved to be qualified. Section 2 Steel Pipes and Steel Pipe Fittings
Article 3.2.1 The performance and inspection of steel pipes used in gas transmission and distribution projects shall comply with the requirements of the following national current standards: 1. GB3091 "Galvanized welded steel pipes for low-pressure fluid transportation"; 2. GB3092 "Welded steel pipes for low-pressure fluid transportation"; 3. YB231 "Seamless steel pipe";
4. SY5036 "Spiral welded submerged arc welded steel pipes for pressure fluid transportation"; 5. SY5037 "Spiral seam submerged arc welded steel pipes for general low-pressure fluid transportation", 6. SY5038 "Spiral seam high-frequency welded steel pipes for pressure fluid transportation"; 7. SY5039 "Spiral seam high-frequency welded steel pipes for general low-pressure fluid transportation"; 8. Steel pipes and steel pipe fittings with working temperatures below -20°C should have low-temperature impact toughness test results, otherwise they should be tested according to the requirements of YB19 "Metal Low-temperature Impact Toughness Test Method", and their indicators shall not be lower than the lower limit of the specified value. Section 3 Cast Iron Pipes and Cast Iron Fittings
Article 3.3.1 The performance and inspection of cast iron pipes and cast iron fittings shall comply with the requirements of the following current national standards:
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Backfill cross section
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1. Chest fill (1) 95%
2. Within 0.5m above the top of the pipe
85%;
()):
3. From 0.5m above the top of the pipe to the ground (III): 1. Ditches within the urban area 95%;
2. Cultivated land 90%.
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
Chapter III Performance and Inspection of Materials
Section I General Provisions
Article 3.1.1 The pipes, pipe fittings, pipeline accessories and sealing packing used in gas transmission and distribution projects shall comply with the relevant national standards in force. All non-standard products shall be subject to performance tests or inspections in accordance with the corresponding standards. Article 3.1.2 Pipes, pipe fittings, pipeline accessories and other materials shall be provided with factory certificates. If there is no certificate, they shall be inspected and tested and only used after being proved to be qualified. Section 2 Steel Pipes and Steel Pipe Fittings
Article 3.2.1 The performance and inspection of steel pipes used in gas transmission and distribution projects shall comply with the requirements of the following national current standards: 1. GB3091 "Galvanized welded steel pipes for low-pressure fluid transportation"; 2. GB3092 "Welded steel pipes for low-pressure fluid transportation"; 3. YB231 "Seamless steel pipe";
4. SY5036 "Spiral welded submerged arc welded steel pipes for pressure fluid transportation"; 5. SY5037 "Spiral seam submerged arc welded steel pipes for general low-pressure fluid transportation", 6. SY5038 "Spiral seam high-frequency welded steel pipes for pressure fluid transportation"; 7. SY5039 "Spiral seam high-frequency welded steel pipes for general low-pressure fluid transportation"; 8. Steel pipes and steel pipe fittings with working temperatures below -20°C should have low-temperature impact toughness test results, otherwise they should be tested according to the requirements of YB19 "Metal Low-temperature Impact Toughness Test Method", and their indicators shall not be lower than the lower limit of the specified value. Section 3 Cast Iron Pipes and Cast Iron Fittings
Article 3.3.1 The performance and inspection of cast iron pipes and cast iron fittings shall comply with the requirements of the following current national standards:
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