UL 25B-2014 pdf download

UL 25B-2014 pdf download.Meters for Diesel Fuel,Biodiesel Fuel,Diesel/Biodiesel Blends with Nominal Biodiesel Concentrations up to 20 Percent (B20), Kerosene,and Fuel Oil.
6.2.2.1.4 Static seals shall be subjected to the Compression Set Test in accordance with the Standard for Gaskets and Seals. UL 157. except for the following modifications:
a) The test duration shall be 1000 hours;
b) The samples shall be immersed, at room temperature, in the test fluids (see item c) while compressed for the entire test duration. No oven conditioning is required.
C) The applicable test fluids shall be as described in Supplement SA.
d) The recovery period shall consist of removing the sample from the compression device and immersing it in the applicable test fluid for 30 minutes at room temperature. The sample shall not be allowed to dry out due to exposure to air. The 30 minute immersion should use the same fluid as the test fluid for each sample,
e) For all matenals. the average compression set is calculated and shall not exceed 35
percent, For coated fabrics, alternate limits can be used with the average compression set not
exceeding 70%.
Exception: This requirement does not apply to composite gasket materials as defined in accordance with the Standard for Gaskets and Seals. UL 157.
6.2.2.2 Dynamic seals
6.2.2.2.1 Dynamic seals shall be evaluated in accodance wTth the Standard for Gaskets and Seals, UL 157. modified as indicated in 62.2.2,2 — 6,2,2.2,4, II a specific material complies with these requirements, the material can be considered to be qualified for system level testing.
6.2.2.22 A dynamic seal shall be constructed of a material that is acceptable In accordance with the scope of the Standard for Gaskets and Seals, UL 157.
6.2.2.2.3 Dynamic seals shall be subjected to the Volume Change and Extraction Test In accordance with the Standard for Gaskets arid Seals. UL 157, except for the following modifications:
a) The test duration shall be 1000 hours;
b) The applicable test fluids shall be as described in Supplement SA: and
C) For all materials, the average volume change for a gasket or seal matenal shall not exceed 40% swell (increase in volume) or 1% shrinkage (decrease in volume). In addition, the weight loss shall not exceed 10%. For coated fabrics, alternate limits can be used with the average volume change not exceeding 60% swell or 5% shrinkage, and the weight loss shall not exceed 20%. There shall be no visual evidence of cracking or other degradation as a result of the exposure for any material including coated fabrics.
6.2.2.2.4 Dynamic seals shall be subocted to the Tensile Strength and Elongation Test in accordance with the Standard for Gaskets and Seals, UI 157, except (or the following modifications:
a) The test duration shall be 1000 hours;
b) The applicable test fluids shall be as described in Supplement SA; and
c) For all materials, the average tensile strength and the average elongation of materials shall not be less than 60% of the as-received values. For coated fabrics, alternate limits can be used with the average tensile strength and the average elongation not less than 30% of the as-received values.
6.2.3 Nonmetallic materials — system level
6.2.3.1 For all materials, gaskets and seals that have been shown to comply with the applicable requirements for static seals in the Standard for Gaskets and Seals, UL 157. or with the requirements under material level tests shall be subjected to the system level tests for the applicable component after the Long Term Exposure Test, Section 12. Static seals shall be provided in accordance with 12.2.4,
6.23.1 revtsedJasiuary2l, 2015
6.3 Casting Impregnation materials
6.3.1 Material level
6.3.1.1 Casting impregnation materials shal be evaluated at the material level in accordance with the requirements in the Outline of Investigation for Dispensing Devices for Diesel Fuel, Biodiesel Fuel, DieselBiodiesel Blends With Nominal Biodiesel Concentrations Up To 20 Percent (820), Kerosene, and Fuel Oil, UL 87B.
6.3.2 System level
6.3.2.1 The casting impregnation maierial, applied as intended to a casting. shall comply with the Long Term Exposure Test, Section 12. The casting shall not show Indications of porosity leakage at any point during or after this test.