Overview
ASTM F1309-23: Standard Practice for Installation Procedures for Fitting Chocks to Marine Machinery Foundations provides comprehensive guidelines for the correct installation of chocks to marine machinery foundations. Developed by ASTM International Committee F25 on Ships and Marine Technology, this standard is crucial for achieving machinery alignment, minimizing vibration, and ensuring long-term operational stability in shipboard environments. It standardizes methods that facilitate safety, efficiency, and durability across the marine industry.
Key Topics
Principal Methods of Fitting Chocks:
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Type A: Epoxy-Based Resin Chocks
- Uses nonshrinking, pourable epoxy resins.
- Resin is poured into contained volumes, cures at ambient temperature, and forms durable solid chocks.
- Facilitates easier future removal using a release agent on contact surfaces.
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Type B: Two-Piece Wedge Chocks
- Fabricated from medium steel or material of similar strength.
- Comprised of two interlocking wedge components, machined to fit precisely.
- Allows fine alignment adjustment via the wedges.
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Type C: Solid One-Piece Fitted Chocks
- Machined from steel plate or approved alternatives.
- Precisely fitted to the machinery bedplate and foundation, ensuring high bearing coverage and structural integrity.
General Installation Requirements:
- Proper alignment of ship machinery requires the ship to be waterborne and stable prior to final chock installation.
- Machined surfaces must meet strict smoothness and dimensional standards for optimal fit.
- Bolt and chock installation must prevent relative movement due to operational vibrations and sea conditions.
- Bolts should be correctly torqued to manufacturer or industry recommendations.
- Where welding is involved, the American Welding Society (AWS D1.1) and American Bureau of Shipping rules must be followed.
- Testing (when specified) on steel and resin chocks includes tensile, compressive, and shock resistance tests as per referenced ASTM methods.
Applications
Practical Uses of ASTM F1309-23:
- Shipbuilding and Retrofit: Ensures accurate and reliable mounting of engines, generators, and other marine machinery on new builds or during refurbishments.
- Vessel Machinery Maintenance: Provides standardized techniques for removing and replacing chocks to correct alignment or repair issues.
- Vibration Reduction: Application of these standardized installation practices minimizes machinery vibration, extending equipment lifespan and improving operational safety.
- Compliance and Safety: Using this standard assists shipyards and operators in meeting classification society requirements and international quality benchmarks.
Related Standards
Organizations implementing ASTM F1309-23 may also reference:
- ASTM A370: Test Methods for Mechanical Testing of Steel Products
- ASTM D638: Tensile Properties of Plastics
- ASTM D648: Deflection Temperature of Plastics Under Flexural Load
- ASTM D695: Compressive Properties of Rigid Plastics
- American Welding Society AWS D1.1: Structural Welding Code
- American Bureau of Shipping (ABS) Rules: Building and Classing Steel Vessels
- MIL-S-901: Shock Tests for Shipboard Machinery and Equipment (when specified)
Summary
Utilizing ASTM F1309-23 ensures marine machinery is fitted with chocks that are properly aligned, securely fastened, and vibration-resistant. This standard optimizes performance, maintains compliance, and supports safety in marine engineering applications globally. For marine professionals, adherence to this standard is integral to achieving long-lasting and maintenance-friendly machinery installations.