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fluid transmission welded api pipe line

Table 6-140 mine fluid transmission pipe welding tolerances (mm)
Outer diameter Allowable deviation Wall thickness Allowable deviation
D≤50
± O. 5
2.5 ~ 12 Earth 12%
D> 50 ± 0.90%
Note: 1. The usual length of steel pipe is 4 ~ 12m. Length and double length should be within the range of the normal length, the total length of the allowable deviation of +15
0 mm. Double the length of the pipe should be left in each between 5 ~ 15mm incision margin.
    2. Bending of steel pipe is not more than 1.2mm per meter, the total curvature of not more than 0.12% of the total length of steel pipe.
(2) Mechanical properties are shown in Table 6-141.
erw pipe,welded pipeline
Table 6-141 mechanical fluid delivery pipe welding mechanical properties
Grade Tensile strength ób / MPa ≥ Yield point ós / MPa ≥ Elongation δ (%) ≥
Q235  
 AB
375 235 20
Note: 1. Tensile test, arbitration to the longitudinal sample shall prevail.
      2. Steel with GB / T700 provisions of the Q235A level, B-class steel or other easily welded mild steel grades, the chemical composition should be consistent with the corresponding standards.
      3. Pipe by welding state delivery.
(3) Hydraulic pressure test is shown in Table 6-142.
(4) Use Suitable for mine air pressure, drainage, gas drainage.
Table 6-142 Hydraulic fluid pressure test value for mining fluid conveying welded steel pipes
OD D / mm Wall thickness S / mm
2.5
3. O
3.5 4.0 4.5
5. O
5.5 6.0 6.5
7. O
7.5 8.0 8.5
9. O
9.5 10 11 12
Test pressure value / MPa
21.3 15.0 15.0 15.0                              
26.8 15.0 15.0 15.0                              
33
15. O
15. O
15.0
15. O
                           
42
15. O
15. O
15.0
15. O
                           
45 15.0
15. O
15. O
15.0                            ,, ,,;,
48 14.7
15. O
15. O
15.0                            
57 12.4 14.8 15.0
15. O
15. O
                         
60 11.8 14.1 15.0 15.0
15. O
                         
70 10.1 12.1 14.1
15. O
15. O
                         
76 9.30 11.1 12.9 14.8
15. O
                         
89   9.50 11.1 12.7 14.3
15. O
                       
95   8.90 10.4 11.9 13.4 14.8                        
102   8.30 9.70 11.1 12.4 13.8
15. O
15. O
15. O
                 
108   7.80 9.10 10.4 11.8 13.1 14.4
15. O
15. O
                 
114     8.70 9.90 11.1 12.4 13.6 14.8
15. O
                 
121     8.20 9.30 10.5 11.7 12.8 14.0
15. O
                 
127     7.80 8.90 10.0 11.1 12.2 13.3 14.4                  
133     7.40 8.50 9.50 10.6 11.7 12.7 13.8                  
140       8.10 9.10 10.1 11.1 12.1 13.1 14.1 15.0              
152       7.40 8.40 9.30 10.2 11.1 12.1
13. O
13.9              
OD D / mm Wall thickness S / mm
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5
7. O
7.5 8.0 8.5 9.0 9.5 10 11 12
Test pressure value / MPa
159       7.10 8.00 8.90 9.80 10.6 11.5 12.4 13.3 14.2
15. O
15.0 15.0      
165         7.70 8.50 9.40 10.3 11.1 12.0 12.8 13.7 14.5
15. O
15.0      
168         7.60 8.40 9.20 10.1 10.9 11.8 12.6 13.4 14.3 15.0 15.0      
180         7.10 7.80 8.60 9.40 10.2
11. O
11.8 12.5 13.3 14.1 14.9      
194           7.30 8.00 8.70 9.40 10.2 10.9 11.6 12.4 13.1 13.8      
203           6.90 7.60 8.30 9.00 9.70 10.4 11.1 11.8 12.5 13.2      
219           6.40 7.10 7.70 8.40 9.00 9.70 10.3 10.9 11.6 12.2      
245           5.80 6.30 6.90 7.50 8.10 8.60 9.20 9.80 10.4 10.9 11.5    
273           5.20 5.70 6.20 6.70 7.20 7.70 8.30 8.80 9.30 9.80 10.3    
295               5.70 6.20 6.70 7.20 7.60 8.10 8.60 9.10 9.60 10.5  
325               5.20 5.60 6.10 6.50 6.90 7.40 7.80 8.20 8.70 9.50  
377               4,50 4.90 5.20 5.60 6.00 6.40 6.70 7.10 7.50 8.20 9.00
402               4.20 4.60 4.90 5.30 5.60 6.00 6.30 6,70 7.00 7,70 8.40
426               4.00 4.30 4.60 5.00 5.30 5.60 6.00 6.30 6.60 7.30 7.90
450               3.80 4.10 4.40 4.70 5.00 5.30 5.60 6.00 6.30 6.90 7.50
480               3.50 3.80 4.10 4.40 4.70 5.00 5.30 5.60 5.90 6.50 7.10
508               3.30 3.60 3.90 4.20 4.40 4.70 5.00 5.30 5.60 6.10 6.70
Note: 1. The values in the table are calculated according to the formula P = 2.SR / D. After the contract is revised, the value of 15.0MPa is calculated as 15.0MPa.
Where: P is the test pressure in MPa; D is the nominal diameter of steel pipe in mm; S is the nominal pipe wall thickness in mm; S is 60% of the specified yield point in MPa.
      2. Steel pipe should be carried out by water pressure test, the test pressure value should be consistent with the provisions of the table. Under test pressure, the voltage regulation time shall not be less than 5s, at this moment, the steel pipe shall not leak water.
 

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