UL 25A-2014 pdf download

UL 25A-2014 pdf download.Meters for Gasoline and Gasoline/Ethanol Blends with Nominal Ethanol Concentrations up to 85Percent (Eo – E85).
6.1.1.3 Metallic parts in contact with the fuels anticipated by these requirements shall not be constructed of lead, or materials that are substantially lead. In addition, no coatings or platings containing lead shall be used, such as terne-plated steel.
61,2 Metallic materials — material level
6.1.2.1 Corrosion due to fluid
6.1.2.1.1 All metallic materials used for fluid confining parts shall be resistant to corrosion caused by the fuels anticipated by these requirements. In addition, metallic materials, used internally in fluid confining parts, that are required to operate in some manner to address safety (e.g. plunger on a valve) shall be resistant to corrosion caused by these fuels. Th’s requirement also applies to all tubing, piping, o other interconnection means between components. Compliance is verified by the Long Term Exposure Test, Section 12,
6.1.2.1.2 A coating or plating, applied to a base metal, shall be resistant to the action of the fuels anticipated by these requirements as determined by the Long Term Exposure Test, Section 12.
6.1.2.2 Atmospheric corrosion
6.1.2.2.1 Metallic matenals used tar fluid confining parts shall be resistant to atmospheric corrosion. In addition, metallic materials that are required to operate to address safety shall be resistant to atmospheric corrosion. Ferrous materials of a thickness specified in the following items are acceptable for the preceding when uncoated:
a) A casting having a wall thickness of not less than 1/4 inch (6.4 mm) if shown by production test to be free of leakage
b) Standard pipe and fittings conforming to the Standard for Welded and Seamless Wrought Steel Pipe, ANSI.ASME 636.1OM; and
C) Fabricated sheet steel parts having a minimum wall thickness of 0.093 inch (2.36 mm).
6.1.2.2.2 A protective coating shall provide resistance against atmospheric corrosion to a degree not less than that provided by the polective coatings specified in 6.1.2.2.3.
6.1.2.2.3 Cadmium plating shall not be less than 0.0003 inch (0.008 mm) thick, and zinc plating shall not be less than 0.0005 inch (0.013 mm) thick, except on parts where threads constitute the major portion of the area in which case the cadmium or zinc plating shall not be less than 0.00015 inch (0.0038 mm) thick. Metallic parts are considered to comply with 6.1.2.2 when they are protected against atmospheric corrosion by:
a) Hot dipped, mill galvanized sheet steel complying with the coating designation G90 In Table I of the Specification for Sheet Steel. Zinc Coated (Galvanized) or Zinc-Iron-Alloy Coated
(Galvannealed) by the Hot Dip Process, ASTM A653/A653M, or
b) Coatings which have been determined to be equivalent to G90 under the requirements of the Standard for Organic Coatings for Steel Enclosures for Outdoor Use Electrical Equipment, UL 1332.
6.1.2.2.4 A metalhc material other than as described in 6.1.2.2.1 — 6.1.2.2.3 shall be painted or Protected in a manner that has been determined to be equivalent.
6.1.3 Metallic materials — system level
6.1.3.1 Combinations of metallic materials in products rated for use with gasoline ethanol blends with nominal ethanol concentrations greater than 25 percent shall be chosen to reduce degradation due to galvanic corrosion in accordance with 6.1.3.2 — 6,1.3.4.
6.1.3.2 Table 6.1 shows the galvanic series for metallic materials exposed to a conductive solution of sea water. The most active material in a given combination will experience increased levels of corrosion. while the most passive material in the combination will expenence reduced levels of corrosion, The greater the separation of the materials in the galvanic series of Table 6.1. the more pronounced the effects would be. Table 6.1 serves as a guide In selecting the appropriate test conditions based on manufacturer specif led material combinations.
6.1.3.3 Plating, such as nickel plating, can be used to reduce or eliminate dissimilar metal contact areas,as long as the plating material complies with 6.1.3.2 as the contact metal. f used, the plating shall complywith the Long Term Exposure Test, Section 12.
6.1.3.4 Gaskets or nonmetallic spacers used to reduce or eliminate dissimilar metal contact areas,wherepermitted,shall be subjected to the applicable requirements for static seals in Nonmetallic materials, 6.2,when they are in contact with the fluid.