04 Ports & Marine Infrastructure
Design the tie system around the waterline.
JOTAIN can support threaded and load-bearing material routes for quay-wall ties, anchorage, connection components, and machinery blanks when loading, exposure zone, protection, inspection, and project acceptance are defined.
Component catalogue / 01
Where we can enter the supply route
Start with the component, then define the material condition, processing boundary, inspection plan, and documentary release.
Quay-wall tie rods
High-strength rod material and processed ends for purchaser-designed retaining systems.
- Heat-treated bar
- Thread preparation
- Protected packing
Anchor rods
Bar and prepared threaded material for marine and waterfront anchorage.
- Specified bar
- Cut length
- Protection when specified
Couplers, clevises, and turnbuckles
Drawing-defined connection and adjustment components.
- Machining
- Thread compatibility
- Finish inspection
Fastener, shaft, and pin blanks
Alloy-steel blanks for heavy marine machinery interfaces.
- QT condition
- Machining allowance
- UT when specified
Engineering conditions / 02
Define the service before the grade
The candidate route becomes meaningful only after load, environment, geometry, interfaces, and acceptance criteria are controlled.
Loading
Tie and machinery routes depend on combined permanent and cyclic actions.
- Design force and fatigue spectrum
- Impact and accidental load
- Connection stiffness and adjustment
Exposure
Protection must match the actual marine zone.
- Atmospheric, splash, immersed, or buried
- Design life and maintenance
- Cathodic-protection interface
Threads and finish
Strength, protection, and assembly cannot be specified separately.
- Thread standard and engagement
- Coating or galvanizing route
- Hydrogen risk and post-process controls
Material route / 03
Material selection boundary
Candidate routes are reviewed against load, fatigue, toughness, section size, thread processing, corrosion system, and the approved project specification.
| Grade | Condition | Why it enters review | Application guardrail |
|---|---|---|---|
| 42CrMo4 / 4140 | QT or thread-ready | Candidate high-strength route for tie, shaft, and pin applications. | Protection and fatigue acceptance remain project-specific. |
| 35CrMo | QT or fastener route | Candidate route for threaded and fastener-related components. | Final fastener performance depends on the complete assembly specification. |
| 40Cr | Heat-treated or machined blank | Candidate route for general marine machinery parts. | Use depends on load, environment, section, and target properties. |
Processing sequence / 04
A route that can be inspected
- 01Approved bar route
- 02Heat treatment
- 03Machining or peeling
- 04Thread and end preparation
- 05Protection when specified
- 06Inspection and protected packing
Verification / 05
Evidence travels with the route
Define test location, acceptance criteria, inspection timing, marking, and release records before production.
Material and integrity
- Heat traceability
- Mechanical tests
- UT when specified
Connection geometry
- Thread dimensions
- Coupler engagement
- Length and straightness
Protection
- Surface preparation record
- Coating thickness when specified
- Thread protection and packing
Standards context / 06
Reference the rule set—do not imply approval
The purchaser's approved drawing, project specification, inspection and test plan, and contractual standard editions control the order.
DNV-RP-C203
Offshore steel-structure fatigue assessment context where the project invokes it.
Open reference ↗ISO 12944-8
Protective-paint-system specification context for relevant exposure and durability requirements.
Open reference ↗Technical enquiry / 07
Send an enquiry engineering can review.
Include these inputs to reduce assumptions, shorten technical clarification, and keep the proposed route inside the purchaser's design boundary.
- 01Marine structure and component
- 02Drawing and project specification
- 03Design load and fatigue context
- 04Exposure zone and design life
- 05Grade or approved material
- 06Dimensions and thread details
- 07Delivery condition
- 08NDT and inspection plan
- 09Protection system
- 10Quantity and destination