Krah K12® pipes
How to compare Krah and ADS pipes?
In the South and North American pipe market there’s some confusion regarding the proper way to compare ADS pipes with other technologies. This is due, mainly, to the fact that ADS technology does not offer standardized pipe stiffness classes (for instance SN2, SN4, SN8, etc, as European standards demand), but they only offer one kind of pipe (with specific ring stiffness) for each diameter.
Usually ADS N12 pipes are used for standard drainage or sewage buried applications. Basically these pipes have a length of 6 or 12 m and they have an integrated jointing technology (depending on the application an integrated electro fusion joint or a rubber ring). The number 12 has no relation to the ISO 9969 stiffness of SN12, the main relation is to the American standard ASTM F894 with a RSCvalue of 120.
Although the static verification of pipes for each project should be mandatory for selecting the proper pipe, sometimes is necessary to ensure the “same stiffness properties” between 2 alternative pipe technologies, and comparing Krah and ADS pipes is not always easy (specially because they measure their ring stiffness according to different standards, with different results). That’s why, in order to give the client an easy and quick answer, Krah is now presenting it’s “K12 line”. This line was made by selecting profiles out of the big range of Krah pipe possibilities, with the idea that a K12 pipe stiffness should be equivalent to the stiffness of ADS N12 pipes.
Basically, as in ADS N12 pipes, the Pipe Stiffness of K12 pipes decreases by increasing the diameter, within the same “K12” classification. But even in large diameters (DN 2000) the stiffness of K12 is applicable for most cases of installation with varying soil and traffic load conditions. Static calculations show that clearly.
The nominal K12 pipe diameter is an internal diameter [DN/ID] and the pipe length (installing length) is 6 m. Regarding the waterway wall thicknesses, European and international minimum values are considered, as in our opinion the waterway wall thickness has the same importance as stiffness, because, at the end, this is the surface which will be affected by abrasion, impact load, corrosion, etc. and this is the thickness which will be responsible for water tightness of a pipe beside the joint itself. This is a big difference with ADS pipes, where waterway wall thicknesses are minimal (1.8 mm for the biggest diameter), not fulfilling the minimum European standards’ requirements.
The following list (with more details) is also available in our new MickeySoftware, the weights are conservative numbers and they can vary in different production facilities, due to different materials.
Diameter DN/ID 
Diameter DN/ID 
Profil No. 
Weight 
Waterway wall thickness 
Weight including socket 
500 mm 
PR 34001.14 
13,9 kg/m 
4 mm 
86 kg/6m 

21” 
PR 42001.88 
18 kg/m 
4 mm 
105 kg/6m 

600 mm 
PR 42001.88 
19,8 kg/m 
4 mm 
117 kg/6m 

24” 
PR 42001.88 
20 kg/m 
4 mm 
119 kg/6m 

27” 
PR 42002.28 
24 kg/m 
5 mm 
147 kg/6m 

700 mm 
PR 42002.28 
24,7 kg/m 
5 mm 
150 kg/6m 

30” 
PR 54004.39 
33 kg/m 
5 mm 
198 kg/6m 

800 mm 
PR 54004.39 
34,5 kg/m 
5 mm 
208 kg/6m 

33” 
PR 54004.39 
36 kg/m 
5 mm 
217 kg/6m 

36” 
PR 54004.39 
39 kg/m 
5 mm 
236 kg/6m 

39” 
PR 65006.46 
45 kg/m 
5 mm 
268 kg/6m 

1000 mm 
PR 65006.46 
44,7 kg/m 
5 mm 
270 kg/6m 

42” 
PR 65006.46 
48 kg/m 
5 mm 
287 kg/6m 

1100 mm 
PR 65006.46 
49 kg/m 
5 mm 
296 kg/6m 

45” 
PR 65006.46 
51 kg/m 
5 mm 
307 kg/6m 

1200 mm 
PR 65007.22 
59 kg/m 
5 mm 
355 kg/6m 

48” 
PR 65007.22 
60 kg/m 
5 mm 
361 kg/6m 

51” 
PR 65008.25 
68 kg/m 
6 mm 
406 kg/6m 

1300 mm 
PR 65008.25 
68 kg/m 
6 mm 
407 kg/6m 

54” 
PR 75011.95 
80 kg/m 
6 mm 
479 kg/6m 

1400 mm 
PR 75011.95 
81 kg/m 
6 mm 
488 kg/6m 

57” 
PR 75077.95 
84 kg/m 
6 mm 
504 kg/6m 

1500 mm 
PR 75011.95 
87 kg/m 
6 mm 
522 kg/6m 

60” 
PR 75011.95 
88 kg/m 
6 mm 
530 kg/6m 

1600 mm 
PR 75011.95 
93 kg/m 
6 mm 
555 kg/6m 

63” 
PR 75011.95 
93 kg/m 
6 mm 
555 kg/6m 

66” 
CPR 6513.71 
97 kg/m 
5 mm 
585 kg/6m 

1700 mm 
CPR 6513.71 
99 kg/m 
5 mm 
593 kg/6m 

69” 
CPR 6515.10 
108 kg/m 
5 mm 
646 kg/6m 

1800 mm 
CPR 6515.10 
110 kg/m 
5 mm 
662 kg/6m 

72” 
CPR 6515.98 
120 kg/m 
6 mm 
718 kg/6m 

1900 mm 
CPR 6517.88 
129 kg/m 
6 mm 
772 kg/6m 

75” 
CPR 6517.88 
129 kg/m 
6 mm 
773 kg/6m 

78” 
CPR 6517.88 
134 kg/m 
6 mm 
803 kg/6m 

2000 mm 
CPR 6518.35 
146 kg/m 
7 mm 
874 kg/6m 
The used profiles are:
PRProfiles 
CPRProfiles 