Schedule 40 (SCH 40)

Pipe wall thickness grade Sch40, carbon steel, low alloy steel of a thickness class code, corresponding to a certain pipe thickness.

Sch40: indicates tensile strength, 40 kg pressure. It can be detected through standard thickness of 4.0mm. Tubes of different diameter, different pressures, different wall thickness.

Steel tube wall thickness representation has a pipe size table, The pipe wall thickness and weight of the tube is a tube sheet number three ways "Sch" indicates the wall thickness. Table number is tube pipe design pressure and design temperature material allowable stress ratio multiplied by 1000, and by the rounded off value.

SCH indicates Inch wall thicknesses

ANSI B36.10 wall thickness grade: Sch10, Sch20, Sch30, Sch40, Sch60, Sch80, Sch100, Sch120, Sch140, Sch160 ten levels.

What Is the Difference Between Schedule 40 & Schedule 80 Pipe?

Schedule 40 and schedule 80 pipe are made from the same material. The difference in structure lies in the thickness of the pipe wall; the higher the schedule, the thicker the wall of the conduit.

Uses

The thicker the wall of the conduit, the stronger it is to both outside forces and internal pressure. Any time there is a necessity for a stronger pipe than the standard strength schedule 40, inspectors may require schedule 80 pipe to be used.

Cost

More material is used in schedule 80 pipe, making it more costly to produce and more expensive to the end user. In applications where extra strength isn't a large concern, schedule 40 pipe is a less expensive alternative.

Diameter

The outside diameter remains the same regardless of schedule. Schedule 40 and schedule 80 pipe use the same fittings and same points of entry, making them interchangeable in jobs that don't require a heavier walled pipe.

Weight

Schedule 40 pipe weighs less per foot than schedule 80 pipe, which makes it easier to install, especially in long runs.

Dangers

If a higher schedule pipe is specified in plans or by inspectors, contractors should never substitute the lower schedule for any reason. Using any construction material that won't stand up to the pressure put upon it by regular use or the environment can have very serious consequences.

Pipes schedule 40 chart, dimensions, weight and pipe wall thickness and Steel Metal Weight Calculator

Pipes schedule 40 chart gives dimensions of steel pipes schedule 40. The chart includes sizes in inches and in millimeters.

Nominal size [inches] Outside diameter [inches] Outside diameter [mm] Wall thickness [inches] Wall thickness [mm] Weight [lb/ft] Weight [kg/m]
1/8 0,405 10,3 0,068 1,73 0,24 0,37
1/4 0,540 13,7 0,088 2,24 0,42 0,84
1/2 0,840 21,3 0,109 2,77 0,85 1,27
3/4 1,050 26,7 0,113 2,87 1,13 1,69
1 1,315 33,4 0,133 3,38 1,68 2,50
1 1/4 1,660 42,2 0,140 3,56 2,27 3,39
1 1/2 1,900 48,3 0,145 3,68 2,72 4,05
2 2,375 60,3 0,154 3,91 3,65 5,44
2 1/2 2,875 73,0 0,203 5,16 5,79 8,63
3 3,500 88,9 0,216 5,49 7,58 11,29
3 1/2 4,000 101,6 0,226 5,74 9,11 13,57
4 4,500 114,3 0,237 6,02 10,79 16,07
5 5,563 141,3 0,258 6,55 14,62 21,77
6 6,625 168,3 0,280 7,11 18,97 28,26
8 8,625 219,1 0,322 8,18 28,55 42,55
10 10,750 273,0 0,365 9,27 40,48 60,31
12 12,750 323,8 0,406 10,31 53,52 79,73
14 14 355,6 0,375 11,13 54,57 94,55
16 16 406,4 0,500 12,70 82,77 123,30
18 18 457,0 0,562 14,27 104,67 155,80
20 20 508,0 0,594 15,09 123,11 183,42
24 24 610,0 0,688 17,48 171,29 255,41
32 32 813,0 0,688 17,48 230,08 342,91
What is the meaning of Schedule 40 pipe?

Based on the NPS and schedule of a pipe, the pipe outside diameter (OD) and wall thickness can be obtained from reference tables such as those below, which are based on ASME standards B36.10M and B36.19M. For example, NPS 14 Sch 40 has an OD of 14 inches (360 mm) and a wall thickness of 0.437 inches (11.1 mm).

NPS OD Schedule # Wall Thickness ID. 1.000” 1.315” SCH 40 0.133” 1.049” (approx.) 1.000” 1.315” SCH 80 0.179” 0.957” (approx.) All pipes are specified using the NPS and schedule numbers. It is the schedule number that determines the approximate inside diameter.

What are Pipe Schedules?

The schedule number on pipe products relates to the thickness of the wall on the pipe: as the number increases, the thicker the wall thickness becomes. Also, while the schedule number can be the same on different sized pipes, the actual wall thickness will be different. Here are a few examples:

What we can see here is that the schedule number increases the wall size and that the wall thickness changes based on the nominal pipe size (NPS).

The best way to see the relationship between pipe size, schedules, and wall thicknesses is simply to refer to a conversion chart (below):

Metric diameter Inch Out diameter the out diameter point to the thickness
A B ASME STD SCH40 SCH80
8 1/4′        
10  3/8        
15 1/2" 21.3 2.77 2.77 3.73
20 3/4" 26.7 2.87 2.87 3.91
25 1" 33.4 3.38 3.38 4.55
32 1.1/4" 42.2 3.56 3.56 4.85
40 1.1/2" 48.3 3.68 3.68 5.08
50 2" 60.3 3.91 3.91 5.54
65 2.1/2" 73 5.16 5.16 7.01
80 3" 88.9 5.49 5.49 7.62
90 3.1/2" 101.6 5.74 5.74 8.08
100 4" 114.3 6.02 6.02 8.56
125 5" 141.3 6.55 6.55 9.53
150 6" 168.3 7.11 7.11 10.97
200 8" 219.1 8.18 8.18 12.7
250 10" 273 9.27 9.27 15.09
300 12" 323.8 9.53 10.31 17.48
350 14" 355.5 9.53 11.13 19.05
400 16" 406.4 9.53 12.7 21.44
450 18" 457.2 9.53 14.27 23.83
500 20" 508 9.53 15.09 26.19
550 22" 558.8 9.53   28.58
600 24" 609.6 9.53 17.48 30.96
650 26" 660.4 9.53    
700 28" 711.2 9.53    
750 30" 762 9.53    
800 32" 812.8 9.53 17.48  
850 34" 863.5 9.53 17.48  
900 36" 914.4 9.53 19.05  
950 38" 965.2 9.53    
1000 40" 1016 9.53    
1050 42" 1066.8 9.53    
1100 44" 1117.6 9.53    
1150 46" 1168.4 9.53    
1200 48" 1219.2 9.53    

There are several schedule numbers used on pipes, such as schedules: 5, 5S, 10, 20, 30, 40, 60, 80, 100, 120, 140, 160, STD, XS, and XXS. The most common ones used are STD, SCH 40 and SCH 80.

What does Nominal Pipe Size or NPS mean?

The NPS size represents the approximate inside diameter (not outside) of the pipe; if the schedule number on a set size is changed, it does affect the inside diameter (ID) but not the outside diameter (OD). In 1927 the American Standard Association replaced the previously used Iron Pipe Sizing (IPS) with Nominal Pipe Sizing (NPS). This North American standard is used on pipes for high or low pressures and temperatures.

Example:

NPS OD  Schedule # Wall Thickness   ID
1.000”      1.315”    SCH 40   0.133”      1.049” (approx.)
1.000”   1.315”     SCH 80  0.179”  0.957” (approx.)

All pipes are specified using the NPS and schedule numbers. It is the schedule number that determines the approximate inside diameter.



Seamless pipe Specification, standard and identification

Seamless pipes are extensively applied for the nuclear device, gas, petrochemical, ship building and boiler industries. Seamless pipes dominates 65% of market share in Chinese boiler industry.