Specific Surface Preparation Clause Samples

Specific Surface Preparation. Surface preparation for the specific system shall be as noted in Section 601.07 – Sections 4, 5, and 6 13. Surface shall be checked in three locations for the presence of chlorides, free iron and sulfates. New tanks shall be tested prior to abrasive blasting, tanks being rehabilitated shall be tested prior to blasting. If blisters are present in existing tank, testing shall also be performed after abrasive blasting. These tests are an Iron Test (Fe2+), Chloride Test and Sulfate Test. Testing shall be carried out as per SSPC Technology Guide 15 “Field Methods for Retrieval and Analysis of Soluble Salts on Steel and Other Nonporous Substrates”. The maximum limits for these contaminants shall be: a. The maximum level of chlorides is 30 milligrams per square meter or 3 micrograms per square centimeter. Item 601 - COATING AND LINING OF POTABLE WATER STORAGE TANKS b. The maximum level of sulfates is 100 milligrams per square meter or 10 micrograms per square centimeter. c. The maximum level of ferrous ions (Fe2+) is 50 milligrams per square meter or 5 micrograms per square centimeter. d. Contamination levels above these limits will require washing and retesting in accordance with Item 2 (below) until the surface is under the allowable limits. If testing shows amounts present in the test solution to be greater than the limits listed herein, the Contractor shall clean the surface of the entire tank interior with a 5,000 psi water blast with fine entrained abrasive until the levels in the test solutions are below the maximum acceptable level. Alternate cleaning methods may be allowed with prior approval of the Engineer. Surface shall be re-blasted as specified in 2.04 at no additional cost to the Owner. Contractor shall provide a written statement from paint manufacturer stating that the maximum acceptable levels are not less than those listed herein. Results of the testing shall be provided to the Owner before any coatings are applied. The following test kits are approved for use on this project: a. Chlor*Rid Chlor*Test Kit