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Water mains

Water mains

SSAB's welded steel pipes can be used in water mains where the maximum operating pressure is usually 16 bar. Pipe fittings are delivered for diameters ≥ DN 400.

The long lifespan of steel pipes is ensured by an external polyethylene coating and an internal concrete or epoxy layer suitable for use with drinking water. The various connection methods can be carried out by welding or with flanges, connectors or sealed sleeve joints.

Our solutions are competitive and technically first rate. We are committed to high delivery capacity and punctuality as well as expert technical customer service.

Applications:

  • Water mains
  • Sewage pipes

Joining methods

Pipe joints connect pipes and fittings into an integrated pipeline.

Joints can be divided into two main types: tension resistant and non-tension resistant. Joints may also be divided by application.
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Joining methods

Pipe joints connect pipes and fittings into an integrated pipeline.

Joints can be divided into two main types: tension resistant and non-tension resistant. Joints may also be divided by application as follows:

Butt joint

Used primarily in tension-resistant pressure lines such as oil, natural gas and district heating pipelines. Used in water pipelines, especially when the diameter is ≥DN 600 and the joint can be repaired from the inside after welding.

OV welded joint

Used in water lines to facilitate installation and to allow 1.5–3.0 degree bends at joints. Since the joint is welded from the inside to make it tension resistant, it is suitable for diameters ≥DN 600 and pressures up to 20 bar.

DIN welded joint with a rubber ring

The DIN joint is made with a rubber ring partially embedded in the concrete (type DIN/G), which eliminates the need to complete the internal concrete lining after welding. Used in pipelines where easy installation of the tension-resistant joint and the possibility of making less than 1.0 degree bends are a must. Welded from the outside. Suits pipe diameters DN 400–1000.

 

Flange joint

Flange joints are widely used in industry. In the case of underground pipes flange joints are used mainly to connect large bends.

Pipe fittings

Internally and externally coated pipe fittings can be easily joined to each other.

Besides standard fittings, SSAB also delivers fittings for water mains tailored to customer specifications, considerably improving the modifiability of the system.
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Pipe fittings

Internally and externally coated pipe fittings can be easily joined to each other.

Besides standard fittings, SSAB also delivers fittings for water mains tailored to customer specifications, considerably improving the modifiability of the system.

 

 

Coatings

External and internal coatings ensure the long life of steel water mains.

SSAB delivers water mains with external polyethylene coating and an internal concrete or epoxy layer suitable for use with drinking water. There are also suitable inside coatings for sewage and rainwater.
Learn more

Coatings

External and internal coatings ensure the long life of steel water mains.

SSAB delivers water mains with external polyethylene coating and an internal concrete or epoxy layer suitable for use with drinking water. There are also suitable inside coatings for sewage and rainwater.

 

External coating

Property Typical values   
Density grade HDPE (High density Polyethene)   
Thickness, mm  > 2,2  DN 400 - 450 
  > 2,5  DN 500 - 750 
  > 3,0  DN 800 - 1200 
  Increased thickness (v) + 0,7   
Bond strenght at +20 ⁰C, N/cm  > 120   
Impact resistance, J/mm > 5   
Identation at +23 ⁰C, mm 0,2 >  
Breaking elongation, % > 400   
Specific resistance, Ωm2 > 108   
Thermal ageing, % 35 >  
Light ageing, %  35 >  
Cathodic disbonding, 30 days, mm  5 >  
Ambient temperature, ⁰C  - 40 ... +80   

 

The 3-layer coating consists of polyethylene, adhesion and epoxy layers.

 

 Internal cement mortal lining

Property Typical values 
 Thickness, mm   8 ± 2 DN 400 - 600
   10± 3 DN 650 - 900
   12± 3 DN 950 - 1200
 Flexural tensile strength, N/mm2  > 5
 Compressive strength, N/mm2  > 50

 

Availability and weights per metre of water mains

Availability and weights per metre of watert mains


Wall thickness [mm] / Weight [kg/m]

6.3
7.1
8
8.8
10
11
12.5
14.2
16
DN400 62.2*
69.9
78.6
86.3
97.8
107
121


DN500 77.9*
87.7
98.6
108
123
135
153


DN600 93.8
106
119*
130
148
162
184
209

DN700
123
139*
152
173
190
215
244
274
DN800

159
175*
198
218
247
280
314
DN900

179
196
223*
245
278
315
354
DN1000

199
219
248
273*
309
351
395
DN1200

239
263
298
328
372*
422
475

 *) The dimensions recommended by SSAB

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