Water mains

Ruukki’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 pipes are protected on the inside by concrete or epoxy suitable for potable water, and on the outside by polyethylene or polyurethane.

The various connection methods can be carried out by welding or with flanges, connectors or sealed sleeve joints.

Applications:

Water mains
Sewage pipes

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	Weight (kg) m / wall thickness t (mm)
Outside diameter mm	5.6	6.3	7.1	8.0	8.8	9.5	10.0	11.0	12.5	14.2	16.0
406.4	55.4	62.2	69.9	78.6	86.3	93	97.8	107	121
457.0	62.3	70	78.8	88.6	97.3	105	110	121	137
508.0	69.4	77.9	87.7	98.6	108	117	123	135	153
559.0	76.4	85.9	96.6	109	119	129	135	149	168
610.0	83.5	93.8	106	119	130	141	148	162	184	209
660.0	90.4	102	114	129	141	152	160	176	200	226
711.0	97.4	109	123	139	152	164	173	190	215	244
762.0		117	132	149	165	176	185	204	231	262
813.0		125	141	159	175	188	198	218	247	280	314
864.0		133	150	169	186	200	211	231	262	298	335
914.0		141	159	179	196	212	223	245	278	315	354
1016.0		157	177	199	219	236	248	273	309	351	395
1220.0		189	212	239	263	284	298	328	372	422	475

Steel grade	Yield strength R_eH N/_mm2Minimum	Breaking strength Rm N/_mm2	Breaking elongation A₅ % Minimum
P235TR1	235	360-500	25
St 37.0	235	350-480	25
St 52.0	355	500-650	21
L235	235	350-500	25
L355	355	500-650	21

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.

Water mains

Dimensions

Dimension and weights per metre

Properties

Joining

Butt joint

OV welded joint

DIN welded joint with a rubber ring

Flange joint

Fittings

Coatings

External coating

Internal cement mortal lining

Order and delivery