JT/T 1282-2019Steel discharge pipeline (English PDF)

Foreword

This standard is in accordance with GB/T Draft the rules given in 1-2009.

This standard was proposed and managed by the National Port Standardization Technical Committee Dredging Equipment Sub-Technical Committee (SAC/TC 530/SC1).

This standard was drafted. China Communications Construction Co., Ltd., CCCC Dredging (Group) Co., Ltd., CCCC Shanghai Waterway Bureau has Co., Ltd., CCCC Tianjin Waterway Bureau Co., Ltd., CCCC Guangzhou Waterway Bureau Co., Ltd., Shanghai Communications Construction General Contracting Co., Ltd., China and Hong Kong Dredging Co., Ltd., CCCC Shanghai Airlines Bureau Channel Construction Co., Ltd., CCCC Dredging Technology and Equipment National Engineering Research Center Co., Ltd.

1 Scope

This standard specifies the form, structure and size, technical requirements, test methods, inspection rules, as well as marking, packaging, and transportation of steel sludge pipes.

Input and storage requirements.

This standard applies to the production, inspection and use of steel sludge pipes. The maintenance of the steel sewage pipe can refer to the use.

2 Normative references

The following documents are essential for the application of this document. For dated references, only the dated version applies to this article Pieces. For undated references, the latest version (including all amendments) applies to this document.

GB/T 191 Packing, storage and transportation icon GB/T 241 Hydraulic test method for metal pipes GB/T 700 carbon structural steel GB/T 709-2006 Size, shape, weight and allowable deviation of hot rolled steel plate and steel strip GB/T 1804-2000 General tolerances Linear and angular tolerances without tolerances GB/T 6092 square ruler GB/T 6315 Vernier, band meter and digital display universal angle ruler GB/T 8923. 1 Visual evaluation of surface cleanliness of steel surfaces before application of coatings Part 1. Uncoated steel Corrosion level and treatment level on the surface and steel surface after the original coating has been completely removed GB/T 9056 metal ruler GB/T 9124-2010 Technical requirements for steel pipe flanges GB/T 1134 Nondestructive testing contact ultrasonic pulse echo thickness measurement method GB/T 21389 Vernier, band meter and digital caliper CB/T 3513 Technical requirements for acceptance of ship painting quality CB/T 3718 Ship coating film thickness detection requirements QB/T 2443-2011 steel tape measure CCS Materials and Welding Code

3 Terms and definitions, symbols

3.1 Terms and definitions the following terms and definitions apply to this document.

3. 1. 1

Steel drainage pipe steel die pinine A steel pipe with a certain length and flange connection used for conveying mud in dredging and filling engineering.

3. 1. 2

Straight pipe pepper Steel sludge pipe with straight axis.

JT/T 1282-2019

3. 1. 3

Elbow bend

The steel sludge pipe made by welding several steel short pipes is inscribed in a circle.

3. 1. 4

Multi-channel tube muti-channel pipe the sum of the number of inlets and outlets is greater than two and the steel sludge pipes with the same diameter are used.

3. 1. Five

Amount of misalignment between moment tollance the amount of deviation of the butt edges of the plates not on the same plane.

3.2 Symbol

C --- flange thickness, unit is millimeter (mm);

D1 --- outer diameter of flange, unit is millimeter (mm);

D2 --- the diameter of the center circle of the bolt hole, in millimeters (mm);

D3 --- Flange inner diameter, unit is millimeter (mm);

D4--Inner diameter, unit is millimeter (mm);

D5 --- Inner diameter of flange bolt hole, unit is millimeter (mm);

L --- length of straight pipe, unit is millimeter (mm);

L1 --- length of main pipe, unit is millimeter (mm);

L2 --- length of branch pipe, unit is millimeter (mm);

L3 --- The distance from the intersection of the main pipe and the centerline of the branch pipe to the flange at the outlet of the main pipe, the unit is millimeter (mm);

n--the number of flange bolt holes;

S --- wall thickness of the pipe body, unit is millimeter (mm);

t1 --- side length of bracket, unit is millimeter (mm);

t2 --- cut angle length of bracket, unit is millimeter (mm);

alpha --- The angle between the main pipe and the center line of the branch pipe, the unit is degree (°);

theta --- The included angle between the flange planes at both ends of the elbow, in degrees (°).

4 Form, structure and dimensions 4.1 form Steel sludge pipes can be divided into the following three forms according to their appearance.

a) straight pipe;

b) elbows;

c) Multi-channel tubes.

4.2 Structure and dimensions 4.2.1 straight pipe the structure of straight pipe is shown in Figure 1. See Table A for the dimensions of straight pipe. 1.

4.2.2 Elbows

The structure of the elbow is shown in Figure 2. Refer to Table A for the dimensions of the elbow. 2.

JT/T 1282-2019

Figure 1 Schematic diagram of straight pipe structure

Figure 2 Schematic diagram of the elbow structure

4.2.3 multi-channel tube

4.2.3.1 The structure of the multi-channel tube is shown in Figure 3, and the dimensions of the multi-channel tube are shown in Table A. 3.

4.2.3.2 The length of the branch pipe (L2), the distance between the intersection of the main pipe and the centerline of the branch pipe and the flange of the discharge port of the main pipe (L3) should not be less than 2 times.

Blue inner diameter (D3).

4.2.4 Flange bracket

4.2.4.1 The structure of the flange bracket is shown in Figure 4. Refer to Appendix A for the thickness of the bracket.

4.2.4.2 The length of the flange bracket and the angle of the bracket cut are calculated according to formula (1) and formula (2), respectively.

D1-D3

2-10 (1)

JT/T 1282-2019

Figure 3 Schematic diagram of multi-channel tube structure

Figure 4 Schematic diagram of flange bracket

4.3 Product model

The product structure of the steel sludge pipe is shown in Figure 5.

Figure 5 Model structure of steel sewage pipe

Example. A steel sludge pipe with a custom code of ABD, an inner diameter of 850mm, a wall thickness of 12mm, a year of manufacture in 2015, and a number of 2001.

For. ABCDC850-12-15-2001.

JT/T 1282-2019

5 Technical requirements

5.1 Appearance

5.1.1 The surface of the pipe body shall be free from defects such as depressions, cracks, scars, folds, and burrs.

5.1.2 The flange sealing surface shall be free from cracks, scratches and other defects.

5.2 Materials

5.2.1 Steel pipe or steel plate specified in GB/T 700 should be used as the material of the pipe body.

5.2.2 The flange material shall meet the requirements of Table 1 in GB/T 9124-2010.

5.3 Welding

Weld bevel, welding process and welding quality shall meet the requirements of "Material and Welding Code".

5.4 Dimensional deviation

5.4.1 Inner diameter the allowable deviation of the inner diameter shall meet the requirements of Table 1.

Table 1 Allowable deviation of inner diameter

Inner diameter D4 (mm) Allowable deviation < 500 ± 0. 20% D4 >=500 ± 0. 25% D4 or ± 3.3. 0mm, whichever is smaller 5.4.2 wall thickness the allowable deviation of the wall thickness of the pipe body shall be in accordance with GB/T 709-2006 6. 1 provisions.

5.4.3 length

5.4.3.1 See Table A for straight pipe length. 1. The length deviation should not be greater than 5mm.

5.4.3.2 Refer to Table A for the length of the main pipe of the multi-channel pipe. 3. The length of the branch pipe is calculated according to formula (1), and the length deviation should not be greater than 5mm.

5.4.4 flange

5.4.4.1 The flange thickness deviation conforms to GB/T 1804-2000. 5. 1 Intermediate m class specified.

5.4.4.2 Flange bolt hole diameter deviation in accordance with GB/T 1804-2000 5. 1 Intermediate m class specified.

5. 4. 4. 3. The diameter of the center circle of the flange bolt hole conforms to GB/T 1804-2000. 5. 1 Intermediate m class specified.

5.4.5 verticality

The plane of the flange shall be perpendicular to the axis of the steel sludge pipe connected to it, and the deviation of verticality shall not be greater than 2 °.

5.4.6 Flatness

The flatness deviation of the flange connection end face should not be greater than 0 of the pipe diameter. 15%.

JT/T 1282-2019

5.4.7 coaxiality

The deviation of the coaxiality between the center of the flange and the center of the pipe should not be greater than 1mm.

5.4.8 Offset amount

5.4.8.1 The wall thickness of the pipe body is not greater than 12. At 5mm, the amount of staggered edges should not be greater than 2mm.

5.4.8.2 The wall thickness of the pipe body is greater than 12. At 5mm, the amount of staggered edges should not be greater than 3mm.

5.5 Hydrostatic pressure the test pressure of hydrostatic pressure test should be 1. 25 times, holding pressure 15min without leakage.

5.6 Painting

5.6.1 The surface treatment of steel before painting should conform to GB/T 8923. 1 in Sa2. Level 5 regulations.

5.6.2 The coating quality shall comply with the provisions of CB/T 3513.

6 Test method

6.1 Test environmental conditions the test should be carried out at room temperature and in a well-ventilated environment.

6.2 Test equipment

The test equipment and requirements are as follows.

a) Steel tape measure shall comply with Type A, Type B, Type C, Type D or Type E specified in ZB/T 2443;

b) A square ruler shall conform to the flat shape specified in GB/T 6092;

c) Vernier universal angle ruler shall conform to Type I specified in GB/T 6315;

d) metal ruler shall meet the requirements of GB/T 9056;

e) The caliper should meet the requirements of GB/T 21389;

f) The dry film thickness gauge shall comply with the requirements of CB/T 3718.

6.3 Appearance

Visually check the appearance quality of the steel sludge pipe.

6.4 Materials

Use the method of checking the material certificate to check the material of the steel sewage pipe.

6.5 Welding

Visually inspect the weld seam surface of the steel drain pipe.

6.6 dimensional deviation

6.6.1 Inner diameter Use a steel tape to measure the inner pipe wall diameter of each pipe end of the steel dredging pipe, and measure three times at different positions on the same pipe end.

The average result is the inner diameter of the tube end.

JT/T 1282-2019

6.6.2 wall thickness the wall thickness of the pipe is measured in accordance with GB/T 11344.

6.6.3 length

6.6.3.1 Use a steel tape measure to measure the distance between the two ends along the inner tube wall of the straight tube parallel to the axis of the straight tube. Measure 3 times at different positions.

The average value of the measurement results is the straight pipe length.

6. 6. 3. (2) Use a steel tape to measure the distance between the two ends of the inner pipe wall of the multi-channel pipe main pipe in a direction parallel to the main pipe axis.

Measure three times, and take the average of the measurement results to calculate the length of the main pipe of the multi-channel pipe.

6.6.3.3 Use a steel tape to measure the main pipe in the outer pipe wall of the multi-channel pipe branch pipe in a direction parallel to the axis of the branch pipe, and the intersection point of the branch pipe axis is in the outer pipe.

The distance from the vertical projection point of the wall to the end face of the branch pipe flange, the result is the length of the multi-channel pipe branch pipe.

6.6.4 flange

6.6.4.1 Use a caliper to measure the thickness of the flange.

6.6.4.2 Use a caliper to measure the inside diameter of the flange bolt hole.

6. 6. 4. 3. Measure the center distance of two bolt holes on the same diameter of the flange with a steel tape measure, and measure at different diameter positions of the same flange.

Next, the arithmetic mean of the measurement results is taken as the diameter of the center circle of the flange bolt hole.

6.6.5 verticality

Using a vernier universal angle ruler, measure the angle between the inner wall of the tube and the end face of the flange along the axis of the tube, and measure at different positions on the same tube end Measure 3 times, and take the maximum value of the remaining angle of the measurement result as the deviation of the verticality of the pipe end.

6.6.6 Flatness

Use a metal ruler with a nominal length not less than the outer diameter of the flange, and place the side of the metal ruler vertically on the flange end along the diameter of the flange the maximum distance from the side of the metal ruler close to the flange to the end face of the flange with a caliper, measured at different diameter positions of the same flange 3 Secondly, the arithmetic mean of the measurement results is taken as the flatness deviation of the end face of the flange connection.

6.6.7 coaxiality

Use a caliper to measure the distance from the inner wall of all flange bolt holes to the inner wall of the steel sludge pipe in any semicircle, and take the extreme of the measurement result.

The difference is the coaxiality deviation.

6.6.8 Offset amount

Use a metal ruler, place the side of the metal ruler flat on the surface of the pipe body weld in a direction perpendicular to the axis of the pipe body, and use another metal ruler Ruler measures the distance from the pipe wall on both sides of the weld to the side of the metal ruler lying on the weld of the pipe body. The difference between the measurement results is the wrong side of the weld.

Measure the amount of edge misalignment three times at different positions of the same pipe body weld, and take the maximum value as the amount of edge misalignment of the pipe body.

6.7 Hydrostatic pressure Hydrostatic pressure test shall be carried out in accordance with GB/T 241.

6.8 Painting

6.8.1 Using GB/T 8923. 1 The prescribed sample photo comparison method is used to check the surface treatment of steel before painting.

6.8.2 Visually check the appearance of the coating and dry film thickness gauge to check the coating thickness.

JT/T 1282-2019

7 Inspection rules

7.1 Inspection classification

7.1.1 Steel silt pipe inspection is divided into type inspection and factory inspection.

7.1.2 Type inspection shall be carried out on steel sludge pipes in one of the following situations.

a) new product production type identification;

b) product transfer to factory;

c) when there are major improvements in product structure, materials, and processes that may affect product performance;

d) when the product is discontinued for more than one year, when it resumes production;

e) required by the competent authority or quality supervision department.

7.1.3 The steel sludge pipe products are subject to factory inspection for each order.

7.2 Inspection items See Table 2 for steel sludge pipe inspection items.

Table 2 Inspection items of steel sewage pipe

Test item requirements Test methods Type inspection Factory inspection

1 Appearance 1 6. 3 + +

2 Tube material and flange material 2 6. 4 + +

3 Welding 5. 3 6.6. 5 + +

4 Inner diameter 5. 4. 1 6. 6. 1 + + 5 wall thickness 4. 2 6. 6. 2 + +

6 Length 5. 4. 3 6.6. 6. 3 + + 7 flange thickness 4. 4. 1 6. 6. 4. 1 + +

8 Inner diameter of flange bolt hole 4. 4. 2 6. 6. 4. 2 + +

9 Diameter of center circle of flange bolt hole 4. 4. 3 6.6. 6. 4. 3 + +

10 Verticality 5. 4. 5 6.6. 6. 5 + +

11 Flatness 5. 4. 6 6. 6. 6 + +

12 Coaxiality 5. 4. 7 6.6. 6. 7 + +

13 Staggered amount 5. 4. 8 6.6. 6. 8 + +

14 Hydrostatic pressure 5. 5 6.6. 7 +-

15 Surface treatment before painting 6. 1 6. 8. 1 +-

16 Painting quality 5. 6. 2 6. 8. 2 + +

Note. "+" is a required inspection item; "-" is an inspection-exempt item.

7.3 Sampling and batching

7.3.1 Type inspection the quantity of each type inspection of steel sludge pipe products is 1 piece.

JT/T 1282-2019

7.3.2 Factory inspection each specification of steel sludge pipe products is subject to factory inspection at 10% and not less than one of the order quantity.

7.4 Judgment rules

7.4.1 Type inspection the type inspection of steel sewage pipe shall meet the following requirements.

a) When all the inspection items meet the requirements, it is judged that the steel silt pipe type inspection is qualified;

b) If the serial numbers 1, 3, 11, 13, 15, and 16 in Table 2 do not meet the requirements, a corrective action may be taken to re-inspect the item.

If the re-inspection meets the requirements, it is still judged that the type of steel sewage pipe is qualified. If the re-inspection still does not meet the requirements, it is determined that the steel sewage pipe Unqualified

c) If there are other items that do not meet the requirements, double the sampling of the batch of ordered products or the batch of raw materials and repeat the non-conforming items If the re-inspection meets the requirements, the steel silt pipe type inspection is still qualified. If the re-inspection still does not meet the requirements, the steel exhaust pipe is judged to be qualified.

The mud pipe type inspection failed.

7.4.2 Factory inspection the factory inspection of steel sludge pipes shall meet the following requirements.

a) When all the inspection items meet the requirements, it is judged that the steel sewage pipe has passed the factory inspection;

b) If the serial numbers 1, 3, 11, 13, and 16 in Table 2 do not meet the requirements, re-inspect the item after taking a corrective action.

If the inspection meets the requirements, it is still determined that the steel sludge pipe has passed the factory inspection. If the re-inspection still does not meet the requirements, it is determined that the steel sludge pipe is shipped Failed inspection

c) If there are other items that do not meet the requirements, double the sampling of the batch of ordered products or the batch of raw materials and repeat the non-conforming items If the re-inspection meets the requirements, it is still determined that the steel sewage pipe has passed the factory inspection. If the re-inspection still does not meet the requirements, it is determined that the steel drainage pipe the mud pipe failed the factory inspection.

8 Marking, packaging, transportation and storage

8.1 Sign

8.1.1 Product model labeling position and form 8. 1. 1. 1. The steel sludge pipe shall be marked with the product model by welding steel characters on the outer wall of the steel pipe.

8.1.1.2 After welding of steel characters, the character surface shall be no less than 2 mm above the surface of the steel pipe.

8.1.1.3 The first character of the mark of the steel sludge pipe shall be not less than 500mm from the pipe end.

8.1.1.4 The distance between the mark of the steel sludge pipe and the weld shall be greater than 25mm.

8.1.2 Storage and transportation signs the storage and transportation marks shall comply with the provisions of GB/T 191 and indicate.

a) product name;

b) name and address of manufacturing unit;

c) the date and number of products manufactured;

d) consignee and name;

e) Product net weight and dimensions.

JT/T 1282-2019

8.2 Packaging

8.2.1 All exposed machined surfaces and bolt holes should be coated with anti-rust oil.

8.2.2 Random technical documents shall be placed in sealed bags. Random technical documents include.

a) product packing list;

b) product quality certification documents;

c) general assembly drawing;

d) inspection and test reports;

e) Quality guarantee.

8.3 Transportation and storage

8.3.1 Steel sludge pipes and parts should be placed horizontally and firmly fixed during transportation.

8.3.2 Steel silt pipes and parts shall be stored in a ventilated and dry environment.

JT/T 1282-2019

Appendix A

(Informative appendix) Straight, elbow, and multi-channel tube sizes A. 1 See Table A for straight pipe dimensions. 1.

Table A. 1 Straight pipe size

Flange bracket bolt holes D3 (Mm) D2 (Mm) D1 (Mm) welding Bevel (Mm) (Mm) (sheet) (A) D5 (Mm) (Mm) 6 × 45 ° 10 × 45 °

5 800,

6 000,

JT/T 1282-2019

Table A. 1 (continued)

Flange bracket bolt holes D3 (Mm) D2 (Mm) D1 (Mm) welding Bevel (Mm) (Mm) (sheet) (A) D5 (Mm) (Mm) 18.1990 20.1994 25 1.2004 1 110 1.200 10 × 45 ° 15 × 45 ° 5 800, 6 000, JT/T 1282-2019

Table A. 1 (continued)

Flange bracket bolt holes D3 (Mm) D2 (Mm) D1 (Mm) welding Bevel (Mm) (Mm) (sheet) (A) D5 (Mm) (Mm) 1.200 15 × 45 ° 5 800, 6 000, JT/T 1282-2019 A. 2 See Table A for the dimensions of the elbow. 2.

Table A. 2 Elbow size

Flange bracket bolt holes D3 (Mm) D2 (Mm) D1 (Mm) (Mm) (Mm) (sheet) (A) D5 (Mm) 15, 20, 25, 30, 45, 60, 90

JT/T 1282-2019

Table A. 2 (continued)

Flange bracket bolt holes D3 (Mm) D2 (Mm) D1 (Mm) (Mm) (Mm) (sheet) (A) D5 (Mm) 1.200 15, 20, 25, 30, 45, 60, 90 18.1990 20.1994 25 1.2004 1.200 JT/T 1282-2019 A. 3 See Table A for dimensions of multi-channel tubes. 3.

Table A. 3 Multi-channel tube size

Flange bracket bolt holes D3 (Mm) D2 (Mm) D1 (Mm) (Mm) (Mm) (sheet) (A) D5 (Mm) L1 (Mm) 2.200 2.200 JT/T 1282-2019

Table A. 3 (continued)

Flange bracket bolt holes D3 (Mm) D2 (Mm) D1 (Mm) (Mm) (Mm) (sheet) (A) D5 (Mm) L1 (Mm) 1.200 18.1990 20.1994 25 1.2004 1 110 1.200 JT/T 1282-2019