... ,etc.so the ductile iron pipe fittings are widely applied to such compressive pipes as water pipeline.oil pipeline,gas ... pipeline,sand pipeline,sewerage pipeline etc2. Product standards:All types of ductile iron pipe fittings ... &nuts Socket end,flange joint(flange type)including flanged fittings,rubber gasket,flange-bolts&nuts.7.Hydrostatic Test Pressure ...