Clover and Erciyas maintain a higher level of compliance for the manufacturing processes and distribution of steel pipes. Key standards we adhere to in the manufacture of steel pipes for the Australian market include:
- AS1579:2001 Arc-welded steel pipes and fittings for water and wastewater.
- AS4321:2001 Polyethylene coatings and linings for pipes and fittings.
- AS1281:2001 Cement mortar linings of steel pipes and fittings.
The range also offers standard proven polyethylene coated and cement lined pipes with alternate coatings and linings available to suit specific applications.
We also have a diverse range of joints types available: including Cylindrical Push-in (C-Joint & E-Joint), Spherical Push-in Ball Joint and Butt Weld Joint to suit specific applications.
Weld process for spirally wound pipe
Welding is carried out inside and outside via a continuous automatic submerged arc welding process. Welding is carried out to meet the requirements of AS/NZS1554.1 Part 1 Welding of steel structures: Category SP.
To maintain the integrity of the steel pipeline, the best joint is a welded joint:
- Standard Joint system (Cylindrical):
- Allows for easy, fast and clean installation
- Single Weld, Seal & Restraint system
Cylindrical C-Joint (Push-in Spigot/Socket)
A cement mortar lined pipe maintains a continuous lining without the need to reinstate the lining to maintain smooth fluid flow. The rubber stopper ensures no damage to cement lining during installation.
- Easily jointing with single weld
- No cement lining reinstatement required
- Maintains smooth internal flow
- Seal coating available
Cylindrical E-Joint (Push-in Spigot/Socket)
The E-Joint for Polyurethane and Epoxy lined pipe incorporates and innovative weldzone feature that ensures lining integrity is not compromised during welding.
- Easily jointed with single weld
- Innovative weld zone to ensure integrity of line system
- Available for Polyurethane or Epoxy linings
Other Joint types are available to suit your application:
- Spherical ball joint, angular deflection up to 10° depending on pipe OD.
- Butt weld joint, for high pressure and larger diameters.
Properties, dimensions and standards
- Manufacturing Standards: AS1579 Arc-welded steel pipes for water and wastewater
- AS4321 PE coatings and linings for pipes and fittings
- AS1281 Cement mortar linings of steel pipes and fittings
- External Diameters: 273mm – 2,235mm (larger sizes available up to 4,064mm)
- Rated Pressures: Up to 6.8MPa (based on material selection & wall thickness)
- Standard Coating: Polyethylene to AS4321
- Standard Linings: Cement Mortar to AS1281
- Coating/Lining options: Polyurethane or Epoxy
- Potable Water: AS4020
|External Diameters (OD)||273mm – 2,235mm (AS1579)|
|External Diameters other (OD)||>2,235mm – 3,048mm (International)|
|Wall Thicknesses (t)||6mm – 35mm (depending on diameter and material)|
|Minimum Ultimate Tensile Strengths||Typical Grades – Other grades as per project needs|
|Minimum Yield Strengths||Typical Grades – Other grades as per project needs|
|Temperature Range||-40°C to 70°C|
|Rated Pressure – MPa(Maximum Allowable Operating Pressure)||Up to 6.8MPa (based on material selection and wall thickness)|
|Test Pressure – MPa (Maximum Allowable Test Pressure and combined stresses)||1.25 times rated pressure|
|Modulus of Elasticity||207,000 N/mm2|
The maximum internal hydrostatic pressure at which hydrostatically tested pipe is suitable for sustained operation is calculated from the following equations:
Rated Pressure MPA – Pr – (Maximum working pressure) formula
|Pr||=||0.72||(||2 x SMYS x t||)|
|Pr||=||0.72||(||2 x NMYS x t||)|
|Pr||Rated pressure MPa|
|SMYS||Specified minimum yield strength|
|NMYS||Nominal minimum yield strength|
|t||Wall thickness of steel|
The maximum rated pressure for pipes produced in accordance with AS1579 is 6.8 MPa. In emergency situations transient pressure may lead to an increase in pipe stress. Under these conditions the maximum allowable combined stresses shall be determined by the designer but should not exceed 0.90 x SMYS/NMYS (1.25 x rated pressure).
|Coating & Lining Capabilities||Min Diameter (mm)||Max Diameter (mm)|
|Coating||3L Polyethylene (standard)|
|Linings||Cement Mortar (standard)|
Seal coat option available
Standard Coating System Overview
Polyethylene coating material fully complies with the material and performance requirements of AS4321:2001 polyethylene coating and lining for pipes and fittings.
Cement Mortar Lining
Cement mortar linings comply with the requirements of AS1281:2001 Cement mortar lining of steel pipes and fittings.
Steel pipes are lined with general purpose Portland cement mortar linings. Linings are applied to give a uniform thickness and finish. Seal coatings are available to apply over the cement mortar lining. Seal coatings limit the interaction between the cement and the contents of the water main. They reduce leaching and consequent elevation of pH levels in supply when conveying soft water, especially where flows are low and residence times are long.