Section 10 · Deep Dives
Applications & use cases
A ram is the wrong machine for a great many jobs and unbeatable for a few. The thing that decides which is neither the size of the demand nor the height of the lift — it is the shape of the demand, and whether a tank can stand between it and the pump.
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Matching the demand shape
A ram delivers very nearly the same volume every hour of every day for years. That single fact sorts every application into one of two piles.
| Demand shape | Fit | Why |
|---|---|---|
| Steady trickle out of a tank — troughs, pond top-up, reservoir replenishment, trees | Ideal | The ram's constant output is the demand. Nothing else is needed — no controls, no power, no attention. |
| Diurnal bursts — household and village taps, morning and evening peaks | Good | A tank sized for a day or two of demand reconciles a bursty draw with a steady supply, for free and forever. See storage. |
| Seasonal or continuous irrigation — drip lines, horticulture, nursery irrigation | Good | Grows in step with the season and the hours of daylight the pump has to work with. Matches low-rate, long-duration application. |
| Top-up duty — dust suppression tanks, fire reserves, header tanks, process water | Good | You are maintaining a level, not meeting a flow. The ram refills the buffer continuously so the buffer can deliver the flow. |
| Large flow on demand — filling a tanker, fire fighting, showers at will, a mill or plant | Wrong tool | The ram cannot be turned up, turned off or aimed at a peak. Buying a bigger ram does not change this; buying a bigger tank does not either, if the peak exceeds the daily total. |
| Very high lift from very little flow | Ambition | Past about a 10:1 lift ratio the output collapses toward a trickle and tuning becomes fragile. See the lift-ratio limits. |
Write down the daily total and the peak rate separately. If the ram's 24-hour output covers the daily total, a tank can cover the peak and the scheme works. If it does not, no amount of clever plumbing will help — the site needs more fall, more spare flow, or a different machine.
Household, village & livestock water
This is the classic duty, and the one that has kept rams at work for two centuries. Water is needed at a point higher than the source, continuously, and the alternative is a walk, a fuel bill or a grid connection that never arrived.
Domestic and community supply
- Service level decides the number. Roughly 20 L per person per day at a standpipe, 50 L with on-plot supply; livestock, schools and clinics add their own. The planning figures are tabulated under storage & distribution.
- Storage does the hard work. People draw in bursts at breakfast and supper; the ram supplies a trickle all night. A tank of a day or two's demand reconciles them, and the gravity main downstream delivers it at a pressure nobody has to pay for.
- Potability is a separate problem from pumping, and often the harder one — protecting the source matters more than treating the water. See water quality, and note the compound ram, which keeps drive water and delivered water in separate circuits so a dirty stream can pump clean water.
Livestock, dairy and watering points
Troughs are a ram's ideal customer: a steady draw, a modest head, and a location where nobody wants to run power. Dairy is the historic case — the rams at East Dundry ran for the dairy farms for the best part of a century — and the same arithmetic applies to a modern trough system.
A 200-head herd at 50 L/head/day needs 10 m³/day. Lifted 6 m on a 1.2 m fall — a 5:1 ratio at 60% efficiency — the drive flow needed is about 0.96 L/s. In other words, one fitter's ram and a small stream water a herd that would otherwise need a pump, a tank, a fuel run and someone to fetch the fuel.
Two practical patterns are worth knowing. Where stock are spread out, one ram can feed several watering points by lifting once to a high tank and letting gravity distribute, which is cheaper than several rams. And where a trough sits on a route the animals walk daily, siting it to intercept them is more reliable than any pump maintenance schedule.
Irrigation, aquaculture & process water
Irrigation
- Drip and low-rate application suit a ram well: the demand is a long, slow soak rather than a flood, which is exactly what a constant output provides. A hectare of drip at 4 L/m²/day is 40 m³/day of water, delivered over 24 hours rather than in one frantic hour.
- Hand-watered nurseries, tree establishment and greenhouse top-up are all the same shape of demand, at a smaller scale, and are excellent first projects — small enough to afford, and forgiving of a ram whose beat is not yet perfectly tuned.
- Flood or furrow irrigation of a large block is a poor fit unless the block is worked in rotation, because it asks for a large flow in a short window. That is a storage problem the ram can only solve if the daily total still fits.
- The dry season still rules the design. Irrigation demand peaks exactly when the stream is lowest, which is why the sizing must be done on the low-flow month and not on a wet-season reading.
Aquaculture and fish ponds
Ponds lose water to evaporation and seepage every day and must be topped up — a continuous, low-rate demand, which is the ram's speciality. Two notes: pond make-up water should be added gently to avoid stirring anoxic sediment, and where the source is cold and shaded, the delivery tank is a useful place to let water warm and aerate before it enters the pond.
Mines, quarries, construction and process water
- Dust suppression on haul roads is a classic use: a header tank kept full by a ram, gravity-fed to sprays or a water cart filling point.
- Fire reserve. A ram cannot deliver a fire flow on demand, but it can keep a dedicated reserve tank full indefinitely and for free — which is precisely what a reserve is for. Size the tank for the fire flow and let the ram replace what is used.
- Process and wash water — screening plants, concrete batching, wheel washes — where the demand is steady and the water need not be potable. The ram's indifference to what the drive water looks like is a virtue here (materials permitting).
- Dewatering is not a ram job. A ram lifts a fraction of what flows through it; if you need to move the whole flow uphill, that is a pump, not a ram. What a ram can do is lift a modest seepage flow to a settling pond using the fall of water already on site.
The schemes that survive are boring: a trough that fills itself, a tank that is full every morning, a reserve that is never empty. If the job can be described as "keep this full", a ram will do it for decades. If it has to be described as "deliver this much, now", it will not — and no amount of engineering will make it.
What those schemes cost over their life is Costs & Operation; what they actually deliver is Performance Data; and how they look in the field is Case Studies.