Installation
AD Installation Readiness Checklist
A practical, section-by-section checklist covering scope, site, concrete, slurry, pipework, electrical, equipment, logistics and outstanding decisions.
8 min readRead Guide
Installation
Common Problems When Preparing a Farm for an AD Installation
Most installation delays are easier and cheaper to solve before the installation team arrives. Here's what commonly causes them, and how a readiness check helps.
8 min read · Reviewed September 2026
Quick Answer
Many problems on an AD installation project arise outside the digester itself. Late decisions, incomplete groundworks, missing equipment, poor access, incorrectly positioned services and unclear responsibility can all delay installation. Most of these are straightforward to prevent with early planning and a proper readiness check before the installation team arrives.
Key Points
- Most delays trace back to preparation, not the digester technology itself
- A clear, agreed scope prevents the most disruptive kind of delay: late changes
- Coordinating trenches, cable routes and concrete together avoids repeated digging
- A readiness check before delivery catches most problems while they're still cheap to fix
Why problems usually sit outside the digester itself
It's tempting to assume installation risk lives in the plant technology, but in practice most delays come from the enabling work around it — groundworks, procurement, coordination and decision-making. This is practical project experience, not a criticism of any particular farmer or supplier: every AD project involves the same categories of risk, and most of them are entirely manageable with early planning.
Incomplete design information and changing layout mid-project
Starting groundworks before the layout, scope and equipment requirements are properly settled is one of the most common sources of avoidable cost. A layout change after concrete has been poured or trenches dug is far more disruptive than the same change made on paper beforehand — it can mean reworking foundations, moving pipe routes, or reordering equipment.
Late equipment orders and fabricated component delays
Pumps, mixers, control panels and fabricated steelwork can all have significant lead times, and ordering them late relative to the construction programme is a common cause of a finished site sitting idle waiting for one missing part. Procurement needs to run ahead of construction, not behind it — covered in more depth in our guide on how long an AD build actually takes.
Unsuitable access and incorrect levels
Access that looks adequate on a farm plan can turn out to be too tight for a concrete wagon, crane or delivery vehicle once construction actually starts. Similarly, small level errors discovered late — after concrete has been poured — can affect pipe falls, equipment alignment and drainage in ways that are expensive to correct after the fact rather than caught during setting out.
Concrete not ready, and incorrect penetrations or equipment positions
Concrete needs adequate curing time before it can take equipment loads, and a programme that doesn't allow for this can force an awkward choice between delaying delivery or risking the new concrete. Incorrectly positioned pipe penetrations or equipment fixings are a related problem — errors of a few hundred millimetres that don't matter on paper can become a real obstacle once expensive equipment is on site and needs to connect to them.
Uncoordinated trenches and an unclear slurry route
Digging separate trenches for slurry pipework, electrical ducting and drainage at different times, rather than planning and excavating them together, wastes time and disturbs the same ground repeatedly. An unclear or late-decided slurry transfer route causes similar problems — it affects pump selection, pipe sizing and the whole layout, and needs settling early rather than worked out once trenching has already started.
Missing electrical preparation and insufficient maintenance access
Electrical ducting and cable routes are best installed while other trenches are open — leaving this until later means digging the same ground again. Insufficient maintenance access is a slower-burning problem: equipment installed without enough room to remove or service it later doesn't cause a delay on installation day, but it creates avoidable difficulty for years afterwards.
Supplier delays, farmer scope changes and unclear contractor responsibility
Supplier and fabrication delays happen on real projects and are worth building some programme flexibility around. Scope changes from the farmer partway through — deciding to take on or hand over more work than originally agreed — are manageable if flagged early, but disruptive if they surface once work is under way. The single most preventable version of this is unclear contractor responsibility: if it isn't obvious who is responsible for a given piece of work, it tends not to get done on time by anyone.
Weather
Groundworks and concrete are weather-dependent, and wet ground conditions can genuinely halt excavation and pours, particularly over winter. This isn't avoidable, but building reasonable contingency into the programme, rather than assuming ideal conditions throughout, reduces how disruptive it ends up being.
How readiness checks reduce problems
Most of what's covered above is easier and cheaper to fix on paper, or with a site check, than once the installation team and equipment are already on site. A structured readiness check before delivery — covered in full in our installation readiness checklist — catches the majority of these issues while they're still straightforward to resolve.
Frequently Asked Questions
Sources
Related AD Guides
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Installing an AD plant involves far more than delivering the digester — from site assessment and agreed scope through groundworks, connections, testing and commissioning.
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Pumps and mixers keep an AD plant's biology and material transfer working — selecting and installing them around the actual duty matters as much as choosing the digester.
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PLANNING AN AD INSTALLATION?
Need help with the practical side of an AD project?
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