UL 331 CRD-2012 UL Standard for Safety Strainers for Flammable Fluids and Anhydrous Ammonia - Section Paragraph Reference New 1 4 and New Supplement SA Subject Strainers for non-p.pdf

1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULUNDERWRITERS LABORATORIES INC. CERTIFICATION REQUIREMENT DECISIONThis Certification Requirement Decision is prepared and published by Underwriters Laboratories Inc.(UL). It is normative for the a

2、pplicable UL Product Certification Program(s); however, it is currently notpart of the UL Standard(s) referenced below.Product Category (CCN): VXYV, VXYV2Standard Number: UL 331Edition Date: February 25, 2008Edition Number: 8Section / Paragraph Reference: New 1.4 and New Supplement SASubject: Strain

3、ers for non-potable waterDECISION:1.4 Non-potable water strainers requirements are covered in Supplement SA.Supplement SA Non-Potable Water StrainersSA1 ScopeSA.1.1 This supplement covers complete, self-contained strainer or filter assemblies intended for use withnon-potable (not for human consumpti

4、on) water.SA1.2 In addition to this Supplement, the following Sections of UL 331 shall apply to the construction ofa non-potable water strainer or filter:1) Section 5 General2) Section 8 Bodies and Covers3) Section 10 SpringsSA2 MaterialsSA2.1 If atmospheric corrosion of a part of the strainer will

5、interfere with the intended function of thestrainer or permit external leakage, the part shall be of corrosion-resistant material or be provided with acorrosion-resistant protective coating.SA2.2 A protective coating shall provide resistance against corrosion to a degree not less than thatprovided b

6、y the protective coating specified in 7.2.SA2.2 Polymeric parts of a non-potable water strainer shall comply with the requirements of theResistance to Impact Test and Mold Stress-Relief Distortion Test, in accordance with the Standard forPolymeric Materials - Use in Electrical Equipment Evaluations,

7、 UL 746C, with the following parameters:1) With regard to the Resistance to Impact Test, the drop impact test shall be conductedutilizing a concrete floor or an equivalent nonresilient floor in lieu of a hardwood surface.2) With regard to the Resistance to Impact Test, the ball impact test shall be

8、conducted withthe impact requirements of 6.8 J (5.0 ft-lbs).UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL3) With regard to the Mold Stress-Relief Distortion Test, the part is to be placed in an air ovenmaintained at 10F 5F (5.6C 2.8C) highe

9、r than the non-potable water temperature rating ofthe strainer/filter but not less than 158F (70C) for 7 hours.SA3 PerformanceSA3.1 If a series of strainers is to be investigated in which the bodies differ in size only, threerepresentative samples are to be chosen to include the largest, smallest, a

10、nd one intermediate size. If astrainer having a single body size is being investigated, one sample is sufficient.SA3.2 The strainer is to be tested with water (potable or non-potable) as the test fluid.SA3.3 The Deformation and External Leakage Test, Section 13, shall be conducted on the non-potable

11、strainer.SA3.4 The Hydrostatic Test, Section 14, shall be conducted on the non-potable strainer.SA3.5 All samples used in the Deformation and External Leakage Test, SA3.3 shall be subjected to theHydrostatic Test of SA3.4. (One sample for both tests)SA4 Manufacturing and Production TestsSA4.1 The re

12、quirements of 19.1 and 19.2 shall apply to non-potable water strainers.SA5 MarkingSA5.1 The requirements of Section 20 shall apply, with the exception of 20.1.f, with “non-potable water”being the fluid service for which the strainer is intended, see 20.1.c.SA5.2 The non-potable water temperature max

13、imum temperature rating is to be marked on the filter orstrainer.RATIONALE FOR DECISION:This Certification Requirement Decision is intended to document the safety requirements for non-potablewater strainers. This decision reflects current engineering practice and takes into account the strength ofth

14、e strainer. Non-potable water is not considered corrosive or destructive to non-metallic gaskets andseals; therefore, the Section 12 testing is not required.Copyright 2012 Underwriters Laboratories Inc.UL, in performing its functions in accordance with its objectives, does not guarantee or warrant t

15、hecorrectness of Certification Requirement Decisions it may issue or that they will be recognized or adoptedby anyone. Certification Requirement Decisions are the opinion of Underwriters Laboratories Inc. inpractically applying the requirements of the standard. They do not represent formal interpret

16、ations of thestandard under American National Standards Institute (ANSI) processes. UL shall not be responsible toanyone for the use of or reliance upon Certification Requirement Decisions by anyone. UL shall not incurany obligation or liability for damages, including consequential damages, arising

17、out of or in connectionwith the use or reliance upon Certification Requirement Decisions. The electronic version of theCertification Requirement Decision is the current version and previously printed copies may be outdated.STANDARD NUMBER: UL 331 -2-UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER

18、 REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULThis document is published as a service to ULs certification customersSTANDARD NUMBER: UL 331 -3-UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULSTANDARD NUMBER: UL 331 -4-No Text on This Page