СНиП на английском языке 2.05.06-85*
SNiP in English 2.05.06-85*
- PIPELINE CORROSION PROTECTION
10.1. Design the means of protection of (underground, surface, aboveground and underwater embedded) steel pipelines against underground and atmosphere corrosion should conform to the provisions of GOST 25812—83* and duly approved regulatory enactments.
10.2. Corrosion control must assure accident-free (i.e., corrosion-proof) operation of the pipelines, irrespective of the laying mode, throughout their service life.
UNDERGROUND CORROSION PROTECTION WITH PROTECTIVE
10.3. Protection of pipelines (except for above-ground pipelines) against underground corrosion, regardless of the corrosive nature of the ground and the laying zone, must be a combined effort that includes protective coating and electrochemical protection.
10.4. Specific pipeline laying and running conditions make it worthwhile applying two types of protective coating: enhanced and normal.
The enhanced type of protective coating should be applied to the liquefied hydrocarbon pipelines, the pipelines of 1020 mm and more in diameter, irrespective of the laying conditions, and also to pipelines of any diameter being laid:
south of latitude 50 ° north;
in salty soil areas anywhere in this country (saliniferous, solonetz, solod, takyr (desert soil), sor (saline) etc.);
in boggy, water-logged, black earth and irrigated soils, as well as in areas of prospective water-supply development;
in underground passages and in flood plains, and also at rail and motor road crossings, including protective enclosures and in adjoining pipeline segments within projected distances in accordance with Table 3 and Table 4;
at crossings with various pipelines — 20 m off the crossing point on either side;on the sites of municipal-industrial effluents, land fills and slag dumps; on the sites of stray currents and those of pipelines with a transported product (313К) temperature of 40° С and more;
on the sites of oil and product pipelines laid within 1000 m of rivers, canals, lakes, and water storage reservoirs, and also of the boundaries of population centers and industrial facilities.
Protective coatings to use in all other cases are of a normal type.
PROTECTING ABOVE-GROUND PIPELINES FROM
10.5. The pipelines laid above the ground must be protected from
atmosphere corrosion with paint and vitreous-enamel coatings, metal plating or grease coatings.
10.6. Paint coatings must have a total thickness of no less than 0.2 mm and continuity of no less than 1 sq. per thickness.
Paint coatings should be monitored by a MТ-41NTs (TU 25-06. 2500-83)- type or by a MТ-ЗЗН (TU 25-06.1874-78)-type thickness gauge for thickness, and by a LKD-1m- or „Krona-1Р» (TU 25-06.2515-83)-type spark flaw detector for continuity.
10.7. The thickness of vitreous-enamel coatings (OST 26-01-1-79) must
be no less than 0.5 mm, and continuity — no less than 2 sq. per thickness.