Water mains
Water mains

Water main pipes

SSAB's welded steel pipes can be used in water mains, where the normal maximum operating pressure is 16 bar. Water main pipe size fittings are delivered for diameters ≥ DN 400.

The long lifespan of steel water main pipe materials 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 main pipes
  • 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.

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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 main pipe sizes 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 main pipe sizes tailored to customer specifications, considerably improving the modifiability of the system.

 

 

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Coatings

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

SSAB delivers water main pipe materials 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.
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Coatings

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

SSAB delivers water main pipes 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

 

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Environmental responsibility and sustainability

SSAB develops new products and services in order to improve our customers’ performance in sustainability and overall efficiency.

Life cycle assessment data for SSAB’s products are available in the form of Environmental product declarations (EPDs). Manufacturing chain from raw material to finished product is carefully managed.

SSAB has introduced CE marking for infrastructure products. Declarations of Performance (DoP) indicate the technical characteristics of CE-marked products.
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Customer cases

Read about our customers' success using SSAB's Infrastructure products

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Availability and weights per metre of water mains
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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