This standard covers sulfur dioxide, a compressed, nonflammable liquified gas, for use in the treatment of municipal and industrial water supplies to remove excess residual chlorine.<\/p>\n
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| 7<\/td>\n | Foreword I.\tIntroduction. I.A.\tBackground.\u2003Sulfur dioxide (SO2), or sulfurous oxide, is a colorless, nonflammable, pungent, suffocating gas. This reducing agent is widely used to remove chlorine and other oxidants from water. Sulfur dioxide is corrosive to mild steel if moisture i <\/td>\n<\/tr>\n | ||||||
| 8<\/td>\n | I.B.\tHistory.\u2003The first edition of ANSI\/AWWA B512, Sulfur Dioxide, was developed by the AWWA Standards Committee on Taste and Odor Control Chemicals and approved by the AWWA Board of Directors on Jan. 27, 1991, with an effective date of June 1, 1991. Subs I.C.\tAcceptance.\u2003In May 1985, the US Environmental Protection Agency (USEPA) entered into a cooperative agreement with a consortium led by NSF International (NSF) to develop voluntary third-party consensus standards and a certification program for direct <\/td>\n<\/tr>\n | ||||||
| 9<\/td>\n | II.\tSpecial Issues. II.A.\tSafety.\u2003Sulfur dioxide is a colorless, nonflammable, pungent gas or liquid with a vapor density of 2.26. Sulfur dioxide reacts with water or free moisture to form sulfurous acid, which is corrosive. <\/td>\n<\/tr>\n | ||||||
| 10<\/td>\n | III.\tUse of This Standard.\u2003It is the responsibility of the user of an AWWA standard to determine that the products described in that standard are suitable for use in the particular application being considered. III.A.\tPurchaser Options and Alternatives.\u2003The following information should be provided by the purchaser: III.B.\tModification to Standard.\u2003Any modification to the provisions, definitions, or terminology in this standard must be provided by the purchaser. IV.\tMajor Revisions.\u2003Major revisions made to the standard in this edition include the following: <\/td>\n<\/tr>\n | ||||||
| 11<\/td>\n | V.\tComments.\u2003If you have any comments or questions about this standard, please contact AWWA Engineering and Technical Services at 303.794.7711; write to the department at 6666 West Quincy Avenue, Denver, CO 80235-3098; or email at standards@awwa.org. <\/td>\n<\/tr>\n | ||||||
| 13<\/td>\n | AWWA Standard SECTION 1:\tGENERAL Sec. 1.1\tScope Sec. 1.2\tPurpose Sec. 1.3\tApplication <\/td>\n<\/tr>\n | ||||||
| 14<\/td>\n | SECTION 2:\tREFERENCES SECTION 3:\tDEFINITIONS <\/td>\n<\/tr>\n | ||||||
| 15<\/td>\n | SECTION 4:\tREQUIREMENTS Sec. 4.1\tPhysical Requirements Sec. 4.2\tChemical Requirements Sec. 4.3\tImpurities* <\/td>\n<\/tr>\n | ||||||
| 16<\/td>\n | SECTION 5:\tVERIFICATION Sec. 5.1\tSampling <\/td>\n<\/tr>\n | ||||||
| 17<\/td>\n | Sec. 5.2\tLaboratory Examination <\/td>\n<\/tr>\n | ||||||
| 18<\/td>\n | Sec. 5.3\tTest Procedures for Sulfur Dioxide, Nonvolatile Residue, Moisture, and Heavy Metals <\/td>\n<\/tr>\n | ||||||
| 19<\/td>\n | Sec. 5.4\tBasis for Shipment and Acceptance <\/td>\n<\/tr>\n | ||||||
| 20<\/td>\n | Sec. 5.5\tNotice of Nonconformance <\/td>\n<\/tr>\n | ||||||
| 21<\/td>\n | SECTION 6:\tDELIVERY Sec. 6.1\tMarking* Sec. 6.2\tPackaging and Shipping <\/td>\n<\/tr>\n | ||||||
| 22<\/td>\n | Sec. 6.3\tAffidavit of Compliance <\/td>\n<\/tr>\n<\/table>\n","protected":false},"excerpt":{"rendered":" AWWA B512-23 Sulfur Dioxide<\/b><\/p>\n |