Specifications
| Parameter | Specification |
|---|---|
| Material | Nickel aluminium bronze C95800 to ASTM B148; aluminium bronze C95400; bronze C83600 and austenitic 316L ASTM A351 CF3M on request |
| Process | Water glass lost wax investment casting for large sections, silica sol for smaller fairleads, plus CNC boring, facing and drilling |
| Tolerance | Casting to ISO 8062 CT8 large format, CT7 on machined interfaces; machined bore to +/- 0.05 mm; ISO 2768-m general |
| Surface finish | As-cast shot blasted, machined bore Ra 3.2 um, ground rope contact radius to Ra 1.6 um, optional passivation or epoxy coating |
| Weight range | 25 kg to 480 kg per casting |
| Heat treatment | Stress relieving at 620-680 C or full annealing per ASTM B148, with furnace chart record for every load |
| Inspection | EN 10204 3.1 or 3.2 certification, PMI alloy verification, dye penetrant to ASTM E165, ultrasonic testing, dimensional report, coating inspection |
Key features
- C95800 nickel aluminium bronze gives excellent resistance to seawater erosion, impingement attack and cavitation at the rope entry radius where flow velocity is highest.
- Cast near-net body replaces heavy fabricated steel weldments, cutting deck weight and eliminating the through-thickness welds that crack under repeated mooring loads.
- The rope groove and bell mouth are cast with generous radii and then ground smooth, protecting synthetic and wire rope from abrasion and point loading.
- Large water glass lost wax capability allows single piece fairleads up to 480 kg, avoiding the segmented construction and joinery of smaller foundries.
- Machined deck flange face and bolt circle are produced in one CNC set-up from the bore datum, keeping the flange square to the pipe axis within 0.05 mm per 100 mm.
- Full thickness ultrasonic examination of the flange to barrel transition, the area most prone to shrinkage in heavy bronze sections.
- Optional galvanic isolation detailing for steel hull installation, including insulating sleeves and non-metallic gasket faces to control dissimilar metal corrosion.
Applications
- Anchor hawse pipes on cargo ships, tankers and bulk carriers.
- Moreover, Mooring fairleads on offshore support and anchor handling vessels.
- Chain and rope passages on tugs, dredgers and workboats.
- Bow and stern mooring stations on ferries and passenger vessels.
- Single point mooring and terminal buoy hawse arrangements.
- Naval and coastguard vessel deck fittings.
- Yacht and superyacht custom deck hardware.
Quality & compliance
Ningbo Ruican supplies castings and machined parts to shipyards and deck equipment makers; class society approvals such as ABS, DNV, LR, BV, RINA, ClassNK, KR and CCS are obtained by the customer or jointly on a project basis, and Ningbo Ruican does not hold class type-approval certificates as a company. Each hawse pipe fairlead casting is delivered with EN 10204 3.1 material certification listing chemical analysis and mechanical properties against ASTM B148, with EN 10204 3.2 third party certification available where a surveyor witness is required. Heat lot traceability is maintained from melt through heat treatment and machining, and a furnace chart is archived for every stress relieving load.
Non-destructive testing options include dye penetrant examination of all machined surfaces, ultrasonic testing of the flange to barrel transition and radiography of critical sections on request, all reported against agreed acceptance criteria alongside a full dimensional report. Contact Wendy She at sales@cnsandcasting.com or WhatsApp +86-13777124360 to discuss your drawing.
FAQ
Q1. Which bronze alloy is best for a hawse pipe fairlead?
C95800 nickel aluminium bronze to ASTM B148 is our standard recommendation, combining high strength with excellent resistance to seawater corrosion, erosion and biofouling. Where the fairlead carries heavier wire rope loads, C95400 aluminium bronze offers higher hardness. For low speed or freshwater service, C83600 bronze or 316L are cost effective alternatives.
Q2. How large a hawse pipe fairlead can you cast?
Using the water glass lost wax process we produce single piece castings from 25 kg up to 480 kg. Where a casting exceeds our envelope, we design a two piece split body with a machined and bolted joint, fully detailed on the manufacturing drawing for your approval before tooling starts.
Q3. Can you machine the bore and prepare the casting for welding into the hull?
Yes. We finish bore the rope passage, face the deck flange, drill the bolt circle and machine the weld preparation bevel to your hull detail. Moreover, machined surfaces are protected with rust preventative and the casting ships on a cradle. We also supply fit-up drawings for the shipyard on request.
Q4. How do you control shrinkage in thick bronze sections?
We run solidification simulation during tooling development, then place risers and chills to feed the flange to barrel transition. Generally, every casting is ultrasonically examined through the heavy sections and dye penetrant tested after machining. Where a first article carries residual risk, we section a sample to verify soundness before release.
Inspection and documentation
Q5. Do you provide EN 10204 3.2 certification and surveyor witness?
EN 10204 3.1 is standard with every order. EN 10204 3.2 can be arranged with third party agencies or a customer nominated surveyor who witnesses mechanical testing, NDT and final dimensional checks. We coordinate the visit and issue the documentation package in your required format.
Q6. What corrosion protection do you recommend on steel hulls?
Nickel aluminium bronze is noble relative to steel hull plate, so we recommend insulating the fairlead with non-metallic gaskets and sleeves and fitting sacrificial anodes nearby. We machine the deck flange to accept insulating kits and hold the gasket faces flat within 0.1 mm for a reliable seal.
