Understanding AODD Pump Curves: Why Flow Rate Drops Before You Expect It
The pump curve looked fine on paper. At the required flow rate and the available air pressure, the pump should have delivered comfortably. Then it was installed, and flow was 30% lower than expected. This is one of the most common commissioning disappointments with AODD pumps — and it is almost always the result of […]
The Relationship Between Stroke Rate and Pulsation — And Why It Matters Downstream
Every stroke of an AODD pump delivers a discrete pulse of fluid. This is not a defect — it is the fundamental operating principle of any positive displacement pump. But pulsation is also one of the most overlooked sources of process problems downstream, and the stroke rate you set has a direct and predictable effect […]
When Your AODD Pump Freezes: Understanding Air Exhaust Icing and How to Prevent It
Your AODD pump slows down, chokes, and stops — but only on humid days, or only in the morning, or only when the compressor has been running hard. The pump is not damaged. The air supply is fine. The problem is ice forming inside the exhaust system, and it is one of the most consistently […]
Pumping Slurries with an AODD Pump: How Ball Seat Geometry Affects Solids Passage and Seal Life
AODD pumps handle slurries better than most other pump types — no mechanical seal to abrade, no close-clearance impeller to jam, no shaft to deflect under asymmetric particle loads. But slurry service does not mean any AODD pump configuration will work. The check valve design — specifically the ball seat geometry — determines whether your […]
Why Diaphragm Material Matters More Than Casing Material in Aggressive Chemical Transfer
When engineers specify an AODD pump for aggressive chemical service, casing material gets most of the attention. PVDF for strong acids. PP for bleach and caustic. Acetal for solvents. The selection logic is sound — but it focuses on the wrong component. In the majority of chemical pump failures, the diaphragm is what fails first, […]
The Hidden Cost of Oversizing an AODD Pump: Air Consumption, Heat, and Diaphragm Life
Selecting a pump one size up “just to be safe” is one of the most common and costly mistakes in AODD pump applications. An oversized AODD pump does not simply deliver more flow than you need — it changes the entire operating character of the pump in ways that increase running costs, shorten service life, […]
Why Your AODD Pump Stalls at Deadhead — And What It Tells You About Your System Design
Your AODD pump runs, the downstream valve closes, and the pump goes quiet. That is deadhead behaviour — and it is supposed to happen. What most operators do not realise is that how your pump behaves at deadhead tells you more about your system than almost any other operating condition. Understanding the mechanism, and what […]
What Happens When You Run a Boiler Monitoring System Without a Sample Cooler
Every boiler feedwater and steam condensate analyser on the market — including the Pyxis Guardian IK-2000 series — specifies that it must be installed downstream of a sample cooler. This requirement is stated prominently in the installation documentation, with operating temperature limits of 40–49°C at the sensor inlet. In practice, sample coolers are frequently omitted […]
Why Cation Conductivity Tells You More Than Standard Conductivity in a Boiler System
Standard conductivity measurement is one of the most common parameters in boiler feedwater and steam condensate monitoring. It is fast, inexpensive, and gives a useful general indication of total dissolved solids. But in power generation and co-generation applications, standard conductivity has a significant limitation: it cannot reliably distinguish between contaminants that are genuinely corrosive and […]
The Consequences of Running a Cooling Tower Above Its Maximum Cycles of Concentration
Cycles of concentration is one of the most important parameters in cooling tower operation. It determines how much mineral content builds up in the circulating water relative to the makeup water, and it directly controls both water consumption and the risk of scale and corrosion. Most operators know they should monitor it. Far fewer understand […]