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The Ductile Iron Pipe Inner Lining

The inner surface of the ductile iron pipe is covered with the cement-mortar lining. The peculiarity of this type of lining is that it provides a passive and an active protection effect. The passive effect is reached because of the isolation of the water from the pipe metal surface. 

An active one is that an additional layer of the lining apears and protect the pipe surface from possible corrosion. 

                       

Except for the protection layer cement-mortar lining makes the hydraulic properties of the pipeline better because of the internal corrosion and any formation absence and because of a thin layer appearance on the lining surface.

Ductile iron pipes with the cement mortar lining allow to decrease hydraulic losts and corresponds to any basic requirenments in the field of energy effectiveness.   

For pipeline internal protection can be used the lining based on portland-cement, sulphate -resistant cement and high-alumina cement depending on aggressive liquid transportation influence 

The choice of the internal lining should be considered according to EN 545 an EN 598 standards.

Liquid transportation

Portland-cement

Sulphate-resistant cement

High-alumina cement

Minimal PH level

6

5,5

4

Maximum content (mg/l):

 

 

 

 

 

- agressive СО
2

7

15

No limits

- sulphates 

400

3000

No limits

magnesium 

100

500

No limits

- ammonium

30

30

No limits




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