HAR 6-77-127
HAR 6-77-127 External corrosion control: protective coating
coating, whether conductive or insulating, applied for the purpose of external corrosion control must:#
(1)Be applied on a properly prepared surface;#
(2)Have sufficient adhesion to the metal surface to effectively resist underfilm migration of moisture;#
(3)Be sufficiently ductile to resist cracking;#
(4)Have sufficient strength to resist damage due to handling and soil stress; and#
(5)Have properties compatible with any supplemental cathodic protection.#
(b)Each external protective coating which is an electrically insulating type must also have low moisture absorption and high electrical resistance.#
(c)Each external protective coating must be inspected just prior to lowering the pipe into the ditch and backfilling, and any damage detrimental to effective corrosion control must be repaired.#
(d)Each external protective coating must be protected from damage resulting from adverse ditch conditions or damage from supporting blocks.#
(e)If coated pipe is installed by boring, driving, or other similar method, precautions must be taken to minimize damage to the coating during installation. [Eff ] (Auth: HRS '269-6) (Imp: 49#