Exploring the Differences Between N80-1 and N80-Q Pipe: A Comprehensive Guide

Introduction

N80-1 and N80-Q are two types of steel pipes used in the Oil and gas industry. Both pipes are made from grade C or Grade L material and are used for a variety of applications. While they are similar in many ways, there are some key differences between the two that should be taken into consideration when selecting the right pipe for a particular project. This guide will provide an overview of the differences between N80-1 and N80-Q pipe, including their material composition, mechanical properties, and applications.

 API 5ct L80 casing Tubing Grade color Codes
Grade Grade Type Number and Color of Bands for Product a with Length ³ 1.8 m Color(s) for couplings
      Entire Coupling Band(s) b, c
1 2 3 4 5
H40 None or black band at the Manufacturer’s option None Same as for pipe
J55 tubing One bright green Bright green None
J55 Casing One bright green Bright green One white
K55 Two bright green Bright green None
N80 1 One red Red None
N80 Q One red, one bright green Red Green
R95 One brown Brown None
L80 1 One red, one brown Red One brown
L80 9Cr One red, one brown, two yellow None Two yellow
L80 13Cr One red, one brown, one yellow None One yellow
C90 1 One purple Purple None
T95 1 One silver Silver None
C110 One white, two brown White Two brown
P110 One white White None
Q125 1 One orange Orange None
a In the case of coupling material, unless otherwise specified in the purchase agreement, the manufacturer’s internal requirements shall govern.
b special clearance couplings shall also have a black band.
c Seal-ring couplings shall also have a blue band.

Material Composition

N80-1 and N80-Q pipes are both made from Grade C or Grade L material. Grade C material is a low-carbon steel that is used for general purpose applications, while Grade L material is a higher-carbon steel that is used for higher-pressure applications. The difference between the two grades is the amount of carbon present in the material. Grade C material has a carbon content of 0.15-0.25%, while Grade L material has a carbon content of 0.30-0.50%.

Mechanical Properties

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The mechanical properties of N80-1 and N80-Q pipes are also different. N80-1 pipe has a higher yield strength than N80-Q pipe, with a minimum yield strength of 80,000 psi for N80-1 and 75,000 psi for N80-Q. N80-1 pipe also has a higher tensile strength than N80-Q pipe, with a minimum tensile strength of 95,000 psi for N80-1 and 90,000 psi for N80-Q.

Labels a           Calculated Mass c
    Nominal Linear Mass T& C b,c Wall Thick- ness       em, Mass Gain or Loss Due to End Finishing d
  Outside Diameter     Inside Diameter Drift Diameter Plain- end kg
              round Thread Buttress Thread
            wpe        
  D kg/m t D mm kg/m Short Long RC SCC
  mm   mm mm            
1 2 3 4 5 6 7 8 9 10 11 12
8 5/8 24 219.08 35.72 6.71 205.66 202.48 35.14 10.93
8 5/8 28 219.08 41.67 7.72 203.64 200.46 40.24 10.07 — 12.44 — 12.57 — 2.51
8 5/8 32 219.08 47.62 8.94 201.2 200.02 e 198.02 195.58 46.33 9.39 12.44 12.57 2.51
8 5/8 32 219.08 47.62 8.94 201.2 193.68 e 46.33 9.39 11.6 11.68 1.62
8 5/8 36 219.08 53.57 10.16 198.76 193.04 52.35 8.72 10.73 10.77 0.71
8 5/8 40 219.08 59.53 11.43 196.22 190.5 58.53 10.73 10.77 0.71
8 5/8 40 219.08 59.53 11.43 196.22 187.6 58.53 9.88 9.87 –0.20
8 5/8 44 219.08 65.48 12.7 193.68   64.64 8.88 8.85 –1.21
8 5/8 49 219.08 72.92 14.15 190.78   71.51      
9 5/8 32.3 244.48 48.07 7.92 228.6 224.66 46.2 11 — 14.48 — 13.87 — 2.74
9 5/8 36 244.48 53.57 8.94 226.6 222.63 51.93 10.36 13.59 12.97 1.84
9 5/8 40 244.48 59.53 10.03 224.4 222.25 e 220.45 218.41 218.41 216.54 216.54 57.99 9.69 13.59 12.97 1.84
9 5/8 40 244.48 59.53 10.03 224.4 215.90 e 57.99 9.69 12.78 12.15 1.01
9 5/8 43.5 244.48 64.74 11.05 222.4 215.90 e 212.83 212.83 63.61 12.84 f 12.15 1.01
9 5/8 43.5 244.48 64.74 11.05 222.4 212.72 e 63.61 12.03 11.39 0.25
9 5/8 47 244.48 69.94 11.99 220.5 212.72 e 210.29 210.29 209.58 206.38 203.23 200.02 68.75 12.09 f 11.39 0.25
9 5/8 47 244.48 69.94 11.99 222.5   68.75 10.57 9.92 –1.22
9 5/8 53.5 244.48 79.62 13.84 216.8   78.72 10.63 f 9.92 –1.22
9 5/8 53.5 244.48 79.62 13.84 216.8   78.72 10.57 9.92 –1.22
9 5/8 53.5 244.48 79.62 13.84 216.8   78.72 10.63 f 9.92 –1.22
9 5/8 53.5 244.48 79.62 13.84 216.8   78.72 9.58 8.92 –2.22
9 5/8 58.4 244.48 86.91 15.11 214.25   85.47 9.65 f 8.92 –2.22
9 5/8 58.4 244.48 86.91 15.11 214.25   85.47 9.58 8.92 –2.22
9 5/8 58.4 244.48 86.91 15.11 214.25   85.47 9.65 f 8.92 –2.22
9 5/8 58.4 244.48 86.91 15.11 214.25   85.47
9 5/8 59.4 244.48 88.4 15.47 213.5   87.37
9 5/8 64.9 244.48 96.58 17.07 210.3   95.73
9 5/8 70.3 244.48 104.62 18.64 207.2   103.82
9 5/8 75.6 244.48 112.51 20.24 204   111.93    

Applications

N80-1 and N80-Q pipes are both used in a variety of applications in the oil and gas industry. N80-1 pipe is typically used for general purpose applications, such as casing and tubing, while N80-Q pipe is used for higher-pressure applications, such as production tubing and completion strings.

Conclusion
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N80-1 and N80-Q pipes are both commonly used in the oil and gas industry. While they are similar in many ways, there are some key differences between the two that should be taken into consideration when selecting the right pipe for a particular project. This guide has provided an overview of the differences between N80-1 and N80-Q pipe, including their material composition, mechanical properties, and applications.

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