... IS1978 ,GB/T3091, GB/T9711,BS 1387UsageUsed for low pressure liquid delivery, such as water, gas, and oil.EndsSquare ends ( ... Test), Exterior Size Inspection, Hydrostatic Test, X-ray Test.Ultrasonic Testing,etcThird party inspection:SGS, BV, Lloyds etc.Mill Test ... Spiral Pipe6.Production Equipment Of Spiral Pipe7. Quality Control(Ultrasonic Testing,etc) Of Spiral Pipe8.Application&Projects Of Spiral ...