ASTM F1431-92 (R2021) pdf free download.Standard Specification for Water Trap for Diesel Exhaust.
1 .1 This specification covers the material, dimensions, and construction of diesel exhaust water traps. which shall he required whenever the exhaust is to he 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 arc not considered standard.
3. Ordering Information
3. 1 Water traps ordered under this specification shall include the following information:
3.1.1 ASTM designation, title and date of this specification,
3.1.2 Quantity,
3.1.3 Size,
3.1.4 Shock test and grade (see Supplementary Requirement Si).
3.1.5 Handhole shall be at 45° unless otherwise specified, and
3.1.6 Flange dimensions shall be indicated for gaskets.
4. Materials and Nianufacture
4. 1 Materials.
4.1.1 The tank and baffles shall he of nickel-chromiummolybdenum-columbiurn alloy and tested in accordance with Specification B443.
4.1.2 Gaskets—Gaskets shall be Classification System F104 (F7121OO—A9B—E22K5M6) and shall withstand temperatures of 650°C (1200°F).
4.2 Manufacture:
4.2.1 Construction of the water traps shall he in accordance rith this specification and Fig. 1.
4.2.2 Welding shall he in accordance with ABS Rules for Building and Classing Steel Vessels or AWS Dl.1.
5. Requirements
5.1 Water traps for diesel exhaust systems shall be designed for maximum temperatures of 650°C (1200°F).
5.2.1 No less than three baffles shall be installed. The bottom bathe shall not extend below the top of the outlet pipe, as shown in Fig. 1.
5.2.2 The inlet may be rotated about the centerline of the trap to suit the installations. The top baffle shall also be rotated to retain the same relation with the inlet as shown in Fig. 1.
5.3 Trap Sire:
5.3.1 The trap size shall be a minimum of 1 m (3 ft) high.
5.3.2 The diameter shall equal twice the diameter of the inlet exhaust line.
5.3.3 The minimum free area through the trap shall equal twice the area of the outlet exhaust line.
5.4 Hand HoIe—The hand hole shall be configured as indicated in Fig. 1.
6. I)irnensions
6.1 The dimensions in Fig. 1 are recommended nominal dimensions.
7. Vorkrnanship, Finish, and Appearance
7.1 Workmanship on traps and piping shall be of sufficient quality to prevent dirt accumulation. Welding shall have small, even heading, free of slag and spatter.ASTM F1431 pdf download.