Crevet Ductile Fittings
Iplex’s foundry NIBF (Northern Iron and Brass Foundry) manufactures the Crevet® range of ductile iron fittings for the water industry. These fittings are produced in diameters from 80mm to 750mm and are compatible with Irontite® DI, PVC, GRP and AC pipelines.
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Technical Guide
Advantages
The Crevet® range of Ductile Iron Fittings has been a popular choice for pipeline construction due to the material advantages and characteristics.
|
Features |
Benefits |
|
Complete range |
Allows flexibility in design and construction |
|
Compact design |
Providing benefits in packaging and handling |
|
Deep sockets |
For use with all pipe systems including PVC-O, PVC-M, PVC-U, GRP and Ductile Iron |
|
Compatible |
Can be used for Series 1 and Series 2 PVC pipe systems |
|
Corrosion protected |
Fittings feature protective coating Plascoat |
Applications
The Crevet® Ductile Iron Fittings are suitable for installation in the following applications:
- Convey potable water
- Gravity and pressure sewerage
- Chemical and slurry solutions
- Irrigation water
The comprehensive range of pipes, fittings and valves up to 750mm offers a pipeline solution for all applications.
Features & Benefits
Product Details
Crevet® Ductile Fittings
The Crevet® ductile fittings are available from DN80 – DN750 in socket, spigot and flange combinations. The extensive range includes:
- Tees
- Bends
- Connectors and Pretaps
- Tapers
- Crosses and Wyes
- Bellmouths
- Hydrant Risers
- Dismantling Joints
With NIBF one of the only Australian foundries still locally manufacturing ductile iron fittings, Iplex rapidly responds to requests for uncommon fitting configurations to meet tight project time lines or assist in supplying fittings for unscheduled repairs.
Socket Joint Deflections
|
DN |
Minimum Joint Deflection (AS/NZS 2280) |
|
80-250 |
3.5° |
|
300-600 |
2.5° |
|
750 |
1° |
Polymeric Coatings
Thermal Bonded Polymeric Coatings (Standard Option)
Crevet® ductile fittings are supplied coated with a thermal bonded polymeric coating. Fittings can be supplied with Polyamide (thermoplastic coating) or other thermoplastic type coatings for Fusion Bonded Epoxy (FBE – thermosetting coating).
Both coating types provide the necessary protection, allowing the product to be installed without the need for sleeving. Thermoplastic and Thermosetting coatings are applied and tested to the requirements of AS4158.
Coating Thickness as per AS4158
|
Coating Material |
Minimum film thickness – Internal surface (µm) |
Minimum film thickness – External surface (µm) |
|
Polyamide (Thermoplastic) |
250 |
200 |
|
FBE (Thermosetting) |
350 |
300 |
Note: 1 µm = 1/1000th of a millimetre.
Cement Lining (Non-standard option)
Cement lining is applied to the requirements of AS/NZS 2280 to give a dense even surface concentric with the internal diameter of the fitting. Cement used is manufactured to AS3972. Fittings come standard with general purpose (GP) and can be supplied with Gb or SR type cement upon requires. All cement lined fittings are required to be seal coated.
Cement Mortar Lining Thicknesses
|
Nominal Diameter DN (mm) |
Lining Thickness (mm) |
|
|
Nominal |
Minimum |
|
|
80-300 |
6 |
9 |
|
375 – 750 |
9 |
7 |
Bitumen Coatings
Bitumen coating is applied to both cement lined and unlined fittings. Bitumen coatings conform with the requirements of AS/NZS 3750.4.
Mechanical Properties
|
Property |
Value & Unit |
|
Density (Specific Gravity) |
7.1 |
|
Ultimate tensile strength |
400MPa |
|
Yield Strain |
12% |
|
Tensile Modulus |
170MPa |
|
Hardness Brinell |
230 |
|
Poisson’s Ratio |
0.3 |
|
Design Stress |
130MPa |
|
Ring bending modulus (3 mins) |
165MPa |
|
Ring bending modulus (50 yrs) |
165MPa |
Thermal Properties
|
Property |
Value & Unit |
|
Coefficient of Thermal Expansion |
12.5 x 10³/°C |
|
Flammability |
Non-Flammable |
|
Allowable Operating Temperature |
50°C |
Allowable Pressure Ratings
Allowable pressure ratings table for fittings used within a PN20 or PN35 pipeline with integral joints.
|
DN |
Allowable Operating Pressure - MPa |
Allowable Maximun Operating Pressure - MPa |
Allowable Site Test Pressure - MPa |
|
80-750 |
3.5 |
4.2 |
4.38 |
|
80-750 |
2.0 |
2.4 |
2.50 |
Allowable pressure ratings table for fittings used within a PN35 pipeline with flange joints.
|
Flange to AS4087 |
DN |
Allowable Operating Pressure - MPa |
Allowable Max. Operating Pressure - MPa |
Allowable Site Test Pressure - MPa |
|
PN16 |
80-750 |
1.6 |
1.92 |
2.0 |
|
PN35 |
80-750 |
3.5 |
4.2 |
4.38 |
Certifications & Approvals
Standards and approvals
Crevet® ductile iron fittings are manufactured to the Australian Product Standard under third party accreditation quality assurance systems confirming to ISO 9001.
- AS/NZS 2280 “Ductile iron pipes and fittings”
- AS/NZS 4020 “Testing of products for use in contact with drinking water”
- AS 1646 “Rubber joint rings for water supply, sewerage and drainage purposes”
- AS 1831 “Spheroidal or nodular graphite iron castings”
- AS/NZS 4087 “Metallic flanges for waterworks purposes”
- AS/NZS 4158 “Thermal bonded polymeric coatings on valves and fittings”
- ISO 16132 “Ductile iron pipes and fittings, seal coats for cement mortar linings”
Installation & Handling
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