Sintakote® steel pipeline systems can be connected via a wide variety of jointing systems.
Overview
Steel Mains can manufacture and supply various jointing systems. These jointing systems fall into two categories: Welded Restrained Pipelines and Unrestrained pipelines, also known as Sintajoint. The selection of the joint type will depend upon the specific requirements for the construction and performance of the pipeline.
Sintajoint is a rubber ring joint specifically designed to eliminate the need for any on site field reinstatement after assembly on site. It provides a factory applied coating system that is continuous within the joint, with its interface under the cement lining ensuring a complete envelope coating end to end. Sintajoint is available in pipe sizes from DN300 to DN1800, and each joint provides angular deflection up to 3° dependent on diameter. Where ground strains are expected to be high, such as in a mine subsidence area, deep entry Sintajoint can be provided to accommodate the greater axial displacements expected.
Sintalock provides all the benefits of Sintajoint and, when combined with external welding, enables construction of a fully end restrained pipeline without the need for concrete thrust blocks. This is a significant improvement on welded joints as it eliminates the safety issues associated with entry, and it is much faster to install as only external welding is required. Sintalock is available DN300 to DN1400 (Type I) and DN500 to DN1800 (Type II).
Steel Mains supplies pipes with welded joints in sizes ranging from DN100 to DN2500. These joints include the Spherical Slip In Joint (SSJ), the Ball and Socket Joint (BSJ), butt weld joints, butt weld joints with weld collars and flanged joints. SSJ joints offer up to 3 degree joint deflection depending on diameter and steel wall thickness. BSJ joints offer 3 degrees joint deflection for all diameters and wall thicknesses, and are only available in sizes DN900 and greater.
Features
- Sintajoint: unrestrained rubber ring joint, DN300 – DN1800, up to 3° deflection
- Deep-entry Sintajoint for high ground-strain areas such as mine subsidence
- Sintalock Type I (DN300 – DN1400) and Type II (DN500 – DN1800), fully restrained
- Spherical Slip-In Joint (SSJ), welded and restrained, DN100 – DN1400, up to 3°
- Ball and Socket Joint (BSJ), welded and restrained, DN900 and above, 3°
- Butt weld, weld collar and flanged joints, DN100 – DN2500
Rubber Ring Joint – Unrestrained
Sintajoint®
SINTAJOINT is a rubber ring joint specifically designed to eliminate the need for any on site field reinstatement after assembly on site. It provides a factory applied coating system that is continuous within the joint, with its interface under the cement lining ensuring a complete envelope coating end to end.
SINTAJOINT is available in pipe sizes from DN 300 to DN 1800. Each joint provides angular deflection up to 3° dependent on diameter. In some special situations where ground strains are expected to be high, e.g., in a mine subsidence area, deep entry SINTAJOINT can be provided to accommodate the greater axial displacements expected.
Rubber Ring Joint – Restrained
Sintalock®
SINTALOCK provides all the benefits of SINTAJOINT and when combined with external welding, enables construction of a fully end restrained pipeline without the need for concrete thrust blocks. This is a significant improvement on welded joints as it eliminates the safety issues associated with entry. SINTALOCK is also much faster to install as only external welding is required.
SINTALOCK Type I welded rubber ring joint is available from DN300 to DN1400, and Type II from DN500 to DN1800.
Welded Joints – Restrained
Steel Mains supplies pipes with welded joints in sizes ranging from DN100 to DN2500. These joints include Spherical Slip In Joint (SSJ), Ball and Socket Joint (BSJ), Butt Weld joints, Butt Weld Joints with Weld Collars and Flanged Joints. SSJ joints offer up to 3 degree joint deflection depending on diameter and steel wall thickness. BSJ joints offer 3 degrees joint deflection for all diameters and wall thicknesses and are only available in sizes DN900 and greater.
Joint comparison
An overview of the joints Steel Mains can supply with Mild Steel Pipe.
| Attribute |
Sintajoint
Rubber Ring, Unrestrained
|
Sintalock I
Rubber Ring, Restrained
|
Sintalock II
Rubber Ring, Restrained
|
Spherical Slip-In Joint
Welded, Restrained
|
Ball & Socket Joint
Welded, Restrained
|
Butt / Plain End
Welded, Restrained
|
|---|---|---|---|---|---|---|
| Sizes available | 324–1829 OD | 324–1422 OD | 508–1829 OD | 168–1422 OD | 914–1981 OD | All sizes |
| Wall thickness | Up to 16mm | Up to 10mm | Up to 12mm | Up to 11mm | Up to 20mm | Up to 25mm |
| Pressure rating | Up to PN42 | Up to PN25 | Up to PN35 | Up to PN70 | Up to PN50 | Up to PN70 |
| Joint deflection | Up to 3° | 1.1° | 1.1° | Up to 3° | 3° | Zero |
| Joint welding | Not applicable | External only | External only | External to 762, Internal/External >762 | Internal/External | External to 762, Internal/External >762 |
| Full fittings system | Yes | Yes | Yes | Yes | Yes | Yes |
| Potable water | Yes | Yes | Yes | Yes | Yes | Yes |
| Aggressive fluids (CAC lining) | Yes | Yes | Yes | Above 813 OD | Yes | Yes |