ASTM F1431-92(2021)

Standard Specification for Water Trap for Diesel Exhaust

ABSTRACT
This specification covers the material, dimensions, and construction of a water trap for diesel exhaust. The diesel exhaust water trap system shall consist of a tank and baffles manufactured from a nickel-chromium-molybdenum-columbium alloy, with gaskets made of nonmetallic materials. A minimum of three baffles shall be installed. The traps shall withstand the maximum temperatures specified, be free of paint, and be so designed such as to prevent sea backwash from entering the diesel exhaust system. The trap and piping systems shall prevent dirt accumulation, with the welding being of small, even beading, free of slag and splatter. Pneumatic proof testing of each trap shall be performed with no visible seam leakage and shall conform to the requirements specified.
SCOPE
1.1 This specification covers the material, dimensions, and construction of diesel exhaust water traps, which shall be required whenever the exhaust is to be expelled through the hull of the vessel.  
1.2 The traps are designed to prevent sea backwash from entering the diesel exhaust system.  
1.3 The values stated in SI units are to be regarded as standard. The values given in parentheses after SI units are provided for information only and are not considered standard.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

• Status: Published
• Publication Date: 31-Dec-2020
• ICS: 47.020.20 - Marine engines and propulsion systems
• Technical Committee: F25 - Ships and Marine Technology
• Drafting Committee: F25.11 - Machinery and Piping Systems

Relations

• Refers: ASTM F104-11(2020) - Standard Classification System for Nonmetallic Gasket Materials
• Effective Date: 01-Jan-2020
• Refers: ASTM B443-19 - Standard Specification for Nickel-Chromium-Molybdenum-Columbium Alloy and Nickel-Chromium-Molybdenum-Silicon Alloy Plate, Sheet, and Strip
• Effective Date: 01-Nov-2019
• Refers: ASTM B443-00(2014) - Standard Specification for Nickel-Chromium-Molybdenum-Columbium Alloy<brk/>&#40;UNS N06625&#41; and Nickel-Chromium-Molybdenum-Silicon<brk/>Alloy &#40;UNS N06219&#41; Plate, Sheet, and Strip
• Effective Date: 01-Oct-2014
• Refers: ASTM F104-11 - Standard Classification System for Nonmetallic Gasket Materials
• Effective Date: 01-Apr-2011
• Refers: ASTM F104-03(2009) - Standard Classification System for Nonmetallic Gasket Materials
• Effective Date: 01-Oct-2009
• Refers: ASTM B443-00(2009) - Standard Specification for Nickel-Chromium-Molybdenum-Columbium Alloy (UNS N06625) and Nickel-Chromium-Molybdenum-Silicon Alloy (UNS N06219)* Plate, Sheet, and Strip
• Effective Date: 01-Oct-2009
• Refers: ASTM B443-00(2005) - Standard Specification for Nickel-Chromium-Molybdenum-Columbium Alloy (UNS N06625) and Nickel-Chromium-Molybdenum-Silicon Alloy (UNS N06219)* Plate, Sheet, and Strip
• Effective Date: 01-Nov-2005
• Refers: ASTM F104-03 - Standard Classification System for Nonmetallic Gasket Materials
• Effective Date: 10-Apr-2003
• Refers: ASTM F104-02e1 - Standard Classification System for Nonmetallic Gasket Materials
• Effective Date: 10-Oct-2002
• Refers: ASTM F104-00 - Standard Classification System for Nonmetallic Gasket Materials
• Effective Date: 10-Oct-2000
• Refers: ASTM B443-00e1 - Standard Specification for Nickel-Chromium-Molybdenum-Columbium Alloy (UNS N06625) and Nickel-Chromium-Molybdenum-Silicon Alloy (UNS N06219)* Plate, Sheet, and Strip
• Effective Date: 10-Aug-2000

Overview

ASTM F1431-92(2021) - Standard Specification for Water Trap for Diesel Exhaust is an essential international standard published by ASTM International. It establishes the requirements for the materials, dimensions, construction, and testing of water traps used in diesel exhaust systems, specifically for scenarios where exhaust must be expelled through a vessel’s hull. The aim is to prevent sea backwash from entering the diesel engine exhaust, ensuring reliable and safe marine diesel operations.

This standard is intended for manufacturers, shipbuilders, system designers, and maintenance professionals who require reliable, high-quality components in marine diesel exhaust systems. ASTM F1431-92(2021) aims to promote system integrity, improve operational safety, and support global consistency in maritime exhaust system manufacturing and installation.

Key Topics

• Material Specifications: Requires the use of nickel-chromium-molybdenum-columbium alloys for tanks and baffles, ensuring durability and corrosion resistance in marine environments. Gaskets must be made from nonmetallic materials and withstand high operating temperatures.

• Construction Requirements: Specifies a minimum of three baffles per trap, a hand hole positioned at 45°, and welding that is small, even, and free of slag and spatter. Traps must be free of paint and designed to minimize dirt accumulation and prevent sea backwash.

• Dimensional Standards: Provides minimum height, diameter, and free area requirements relative to the exhaust and outlet lines. Dimensions and configurations are given in SI units as standard, with imperial units in parentheses for reference.

• Testing and Quality Assurance: Each water trap must undergo pneumatic proof testing at specified pressure levels to confirm absence of seam leakage. Additional shock testing may be applied per MIL-S-901 if specified by the purchaser.

• Marking and Packaging: Requires weatherproof tagging and compliant packaging. No asbestos or asbestiform materials are permitted in packaging materials.

• Compliance and Inspection: Purchasers have the right to inspect manufacturing processes and final products at the supplier’s facility to ensure adherence to the standard.

Applications

• Marine Diesel Exhaust Systems: Primarily used in ships and marine vessels where diesel exhaust is expelled through the hull, making effective water traps critical for preventing backflow and potential water ingress.

• Piping System Integrity: Ensures long-term reliability and performance of exhaust piping in harsh marine environments by mandating robust materials and precise construction.

• Naval and Commercial Vessels: Applicable to both military and civilian maritime sectors, including commercial shipping, workboats, and naval craft requiring compliance with international maritime standards.

• Shipbuilding and Maintenance: Used by shipyards, component manufacturers, and maintenance crews to specify, fabricate, or replace diesel exhaust water traps to globally recognized benchmarks.

Related Standards

Professionals implementing ASTM F1431-92(2021) for water traps in diesel exhaust systems may also need to consult:

• ASTM B443: Specification for Nickel-Chromium-Molybdenum-Columbium Alloy and Nickel-Chromium-Molybdenum-Silicon Alloy Plate, Sheet, and Strip.

• ASTM F104: Classification System for Nonmetallic Gasket Materials.

• AWS D1.1: Structural Welding Code, for welding practices and quality.

• MIL-S-901: Military standard for shock testing of shipboard machinery, equipment, and systems.

• ABS Rules for Building and Classing Steel Vessels: For vessel construction and marine system compliance.

Following ASTM F1431-92(2021) aids in assuring safety, operational efficiency, and international regulatory compliance for diesel exhaust systems on marine vessels.

Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: F1431 −92 (Reapproved 2021) An American National Standard
Standard Specification for
Water Trap for Diesel Exhaust
This standard is issued under the fixed designation F1431; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 2.3 Other Documents:
ABS Rules for Building and Classing Steel Vessels
1.1 This specification covers the material, dimensions, and
AWS D1.1 Structural Welding Code
construction of diesel exhaust water traps, which shall be
required whenever the exhaust is to be expelled through the
3. Ordering Information
hull of the vessel.
3.1 Water traps ordered under this specification shall in-
1.2 The traps are designed to prevent sea backwash from
clude the following information:
entering the diesel exhaust system.
3.1.1 ASTM designation, title and date of this specification,
1.3 The values stated in SI units are to be regarded as
3.1.2 Quantity,
standard. The values given in parentheses after SI units are
3.1.3 Size,
provided for information only and are not considered standard.
3.1.4 Shocktestandgrade(seeSupplementaryRequirement
1.4 This international standard was developed in accor- S1),
dance with internationally recognized principles on standard-
3.1.5 Handhole shall be at 45° unless otherwise specified,
ization established in the Decision on Principles for the and
Development of International Standards, Guides and Recom-
3.1.6 Flange dimensions shall be indicated for gaskets.
mendations issued by the World Trade Organization Technical
Barriers to Trade (TBT) Committee.
4. Materials and Manufacture
4.1 Materials:
2. Referenced Documents
4.1.1 The tank and baffles shall be of nickel-chromium-
2.1 ASTM Standards:
molybdenum-columbium alloy and tested in accordance with
B443 Specification for Nickel-Chromium-Molybdenum-
Specification B443.
Columbium Alloy and Nickel-Chromium-Molybdenum-
4.1.2 Gaskets—Gaskets shall be Classification System F104
Silicon Alloy Plate, Sheet, and Strip
(F712100–A9B4–E22K5M6) and shall withstand temperatures
F104 Classification System for Nonmetallic Gasket Materi-
of 650°C (1200°F).
als
4.2 Manufacture:
2.2 Military Standard:
4.2.1 Construction of the water traps shall be in accordance
MIL-S-901 Requirements for Shock Tests, High Impact,
with this specification and Fig. 1.
Shipboard Machinery, Equipment and Systems
4.2.2 Welding shall be in accordance with ABS Rules for
Building and Classing Steel Vessels or AWS D1.1.
This specification is under the jurisdiction of ASTM Committee F25 on Ships
and Marine Technology and is the direct responsibility of Subcommittee F25.11 on
5. Requirements
Machinery and Piping Systems.
Current edition approved Jan. 1, 2021. Published January 2021. Originally
5.1 Water traps for diesel exhaust systems shall be designed
approved in 1992. Last previous edition approved in 2016 as F1431 – 92 (2016).
for maximum temperatures of 650°C (1200°F).
DOI: 10.1520/F1431-92R21.
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. Available from American Bureau of Shipping (ABS), ABS Plaza, 1701 City
Available from U.S. Government Printing Office, Superintendent of Plaza Dr., Spring, TX 77389, http://www.eagle.org.
Documents, 732 N. Capitol St., NW, Washington, DC 20401-0001, http:// Available from American Welding Society (AWS), 8669 NW
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