What standards apply to water transmission pipes?
AWWA C200 for steel water pipe. ANSI/AWWA C205 for cement mortar lining. NSF/ANSI 61 for drinking water components. Local water authority specifications. Environmental regulations for water quality.
How are welded pipes protected in water service?
Cement mortar lining prevents internal corrosion. External coatings suitable for soil conditions. Cathodic protection for buried installations. Special linings for aggressive water chemistries. Regular cleaning prevents biological growth.
What are the advantages of welded pipes for water systems?
Leak-tight construction maintains system integrity. Ability to withstand high operating pressures. Long service life with proper maintenance. Adaptability to various terrain conditions. Cost-effectiveness for large diameter applications.
How are water pipes tested before commissioning?
Hydrostatic testing verifies pressure integrity. Bacteriological testing ensures water quality. Flow testing checks hydraulic performance. Leak detection surveys identify joint issues. Final inspections confirm proper installation.
What special considerations apply to large diameter water mains?
Thrust restraint design for pressure changes. Special handling equipment for heavy sections. Field joint coating compatibility. Valve and fitting integration. Air relief and drainage provisions.
