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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 RSC-value 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 “K-12” 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.

k12

 

The following list (with more details) is also available in our new Mickey-Software, 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
s1

Weight including socket

500 mm

 

PR 34-001.14

13,9 kg/m

4 mm

86 kg/6m

 

21”

PR 42-001.88

18 kg/m

4 mm

105 kg/6m

600 mm

 

PR 42-001.88

19,8 kg/m

4 mm

117 kg/6m

 

24”

PR 42-001.88

20 kg/m

4 mm

119 kg/6m

 

27”

PR 42-002.28

24 kg/m

5 mm

147 kg/6m

700 mm

 

PR 42-002.28

24,7 kg/m

5 mm

150 kg/6m

 

30”

PR 54-004.39

33 kg/m

5 mm

198 kg/6m

800 mm

 

PR 54-004.39

34,5 kg/m

5 mm

208 kg/6m

 

33”

PR 54-004.39

36 kg/m

5 mm

217 kg/6m

 

36”

PR 54-004.39

39 kg/m

5 mm

236 kg/6m

 

39”

PR 65-006.46

45 kg/m

5 mm

268 kg/6m

1000 mm

 

PR 65-006.46

44,7 kg/m

5 mm

270 kg/6m

 

42”

PR 65-006.46

48 kg/m

5 mm

287 kg/6m

1100 mm

 

PR 65-006.46

49 kg/m

5 mm

296 kg/6m

 

45”

PR 65-006.46

51 kg/m

5 mm

307 kg/6m

1200 mm

 

PR 65-007.22

59 kg/m

5 mm

355 kg/6m

 

48”

PR 65-007.22

60 kg/m

5 mm

361 kg/6m

 

51”

PR 65-008.25

68 kg/m

6 mm

406 kg/6m

1300 mm

 

PR 65-008.25

68 kg/m

6 mm

407 kg/6m

 

54”

PR 75-011.95

80 kg/m

6 mm

479 kg/6m

1400 mm

 

PR 75-011.95

81 kg/m

6 mm

488 kg/6m

 

57”

PR 75-077.95

84 kg/m

6 mm

504 kg/6m

1500 mm

 

PR 75-011.95

87 kg/m

6 mm

522 kg/6m

 

60”

PR 75-011.95

88 kg/m

6 mm

530 kg/6m

1600 mm

 

PR 75-011.95

93 kg/m

6 mm

555 kg/6m

 

63”

PR 75-011.95

93 kg/m

6 mm

555 kg/6m

 

66”

CPR 65-13.71

97 kg/m

5 mm

585 kg/6m

1700 mm

 

CPR 65-13.71

99 kg/m

5 mm

593 kg/6m

 

69”

CPR 65-15.10

108 kg/m

5 mm

646 kg/6m

1800 mm

 

CPR 65-15.10

110 kg/m

5 mm

662 kg/6m

 

72”

CPR 65-15.98

120 kg/m

6 mm

718 kg/6m

1900 mm

 

CPR 65-17.88

129 kg/m

6 mm

772 kg/6m

 

75”

CPR 65-17.88

129 kg/m

6 mm

773 kg/6m

 

78”

CPR 65-17.88

134 kg/m

6 mm

803 kg/6m

2000 mm

 

CPR 65-18.35

146 kg/m

7 mm

874 kg/6m

 

The used profiles are:

PR-Profiles

k12pr

CPR-Profiles

k12cpr