Tag: pumps
Municipal utilities face a narrow window to set credible PFAS monitoring before steady regulation and public scrutiny force expensive retrofits; this practical guide to pfas testing methods for municipalities focuses on what to specify in contracts, how to prevent field and lab contamination, and how to turn data into treatment decisions. It compares targeted LC-MS/MS […]
INTRODUCTION One of the most persistent and costly errors in municipal water and wastewater engineering is the practice of “line-sizing” control valves. When engineers default to matching a control valve’s diameter to the adjoining pipe size, the result is almost always an oversized valve. A poorly sized valve operating continuously between 10% and 20% open […]
When a gould pump goes down at a municipal station the consequences are immediate: bypasses, regulatory headaches, and costly emergency repairs. This hands-on guide shows operators and engineers how to translate a wastewater duty point into the right Goulds model, size and commission the pump with proper NPSH margin, implement preventive maintenance and condition monitoring, […]
Introduction In municipal and industrial wastewater handling, the “iceberg effect” is a well-documented economic reality: the purchase price of a pump represents only a fraction of its true cost. Yet, municipal bid structures often prioritize the lowest initial capital expenditure (CAPEX), inadvertently locking utilities into decades of excessive operational expenditure (OPEX). For consulting engineers and […]
Introduction One of the most persistent friction points in wastewater treatment plant design is the misalignment between initial procurement budgets and long-term operating realities. Engineers frequently encounter scenarios where a positive displacement pump is required for high-solids or viscous sludge applications, yet the specification process defaults to the lowest bidder. This approach often ignores the […]
Introduction One of the most expensive misunderstandings in wastewater treatment and industrial fluid handling is the assumption that all pumps behave hydraulically like centrifugal pumps. This misconception is particularly dangerous when applied to positive displacement (PD) technology. While a centrifugal pump simply stops flowing when discharge pressure equals its shutoff head, a progressive cavity (PC) […]
Introduction In municipal and industrial water treatment, diaphragm pumps—whether Air-Operated Double Diaphragm (AODD), solenoid metering, or mechanically actuated—are the workhorses of chemical delivery and sludge handling. Yet, they are frequently the source of disproportionate operational headaches. A surprising industry statistic suggests that while chemical feed systems often represent less than 5% of a plant’s capital […]
Introduction One of the most persistent misconceptions in municipal wastewater engineering is that positive displacement (PD) pumps are immune to the hydraulic sensitivities that plague centrifugal systems. While it is true that double disc pumps (DDP) are robust, self-priming, and capable of handling high solids, they remain subject to the fundamental laws of fluid mechanics. […]
Introduction One of the costliest errors in municipal wastewater design is the mismatch between pump metallurgy and fluid characteristics. Engineers often default to 316 Stainless Steel for its “universal” corrosion resistance, only to witness premature failure due to abrasive scour in grit-heavy sludge applications. Conversely, specifying standard Grey Cast Iron for septic receiving stations can […]
Introduction The modern wastewater stream has undergone a radical transformation in the last two decades. The proliferation of non-dispersible synthetic fabrics—commonly known as “flushable” wipes—combined with water conservation mandates that reduce transport velocities, has created a perfect storm for municipal and industrial operators. For engineers involved in lift station design and treatment plant operations, the […]