dirt steam grease Systems d/p cell blunting adequacy mass flow condition corrosion sharp edge pipe sizes pipe state deposition fluid flows 6" diameter installation water hammer larger pipes tap location plate warpage unit blockage optimal choice stainless steel orifice surface critical factors lead line design minimal build-up secondary phases integral orifice prevalent material straight pipe runs gasket interference unwavering attention erosion-induced nicks cost-effective solution orifice plate flow meter orifice bore misalignment low flow rate measurement clean, single-phase fluids potential adverse circumstances substantial measurement inaccuracies Pride Orifice Flow meter Pride Controls crucial differential pressure flow meter