How to Turn a Restaurant Seafood Brief into an Equipment Schedule

The Menu Is the First Engineering Document

A restaurant seafood-tank brief should be converted into an equipment schedule by translating six commercial facts—species, peak biomass, holding time, target temperature, room conditions, and operating routine—into measurable duties for chilling, circulation, mechanical filtration, biofiltration, aeration, monitoring, drainage, and backup equipment.

The mistake is jumping directly from:

“We need a 1,200 L lobster and crab display.”

to:

“1,200 L tank + 2 HP chiller + large filter.”

FAO's recirculating-system engineering guidance does not size life support that way. Oxygen demand depends on animal mass; ammonia treatment depends on nitrogen load and biofilter performance; complex recirculation combines mechanical filtration, biological treatment, and re-aeration.

At Ruibit, I would want the restaurant brief converted into numbers before the final tank drawing is released.

Sometimes the equipment schedule changes the tank.

The Brief Arrives on One Page

Let's use a worked project.

A restaurant sends this:

Display: two-tier live seafood tank
Species: lobster + crab
Normal inventory: 28 kg
Friday peak: 52 kg
Maximum holding time: 3 days
Restaurant ambient: 24°C normally, 32°C worst case
Available wall: 2.2 m
Power: 230 V / 50 Hz
Staff: filter cleaning once daily
Priority: quiet operation, low mortality, easy cleaning

That's actually a decent brief.

Notice what is missing:

pump flow;

bio-media liters;

chiller horsepower;

air-pump capacity.

Good.

Those are outputs, not buyer guesses.

First Split the Animals Before Splitting the Equipment

Lobster and crab should not automatically share one hydraulic loop simply because both are seafood.

FAO recommends avoiding overcrowding in live lobster holding and notes that crabs should be kept in circulated seawater at temperatures appropriate to the species; technical requirements vary among finfish, crustaceans, and molluscs.

So the first equipment decision might actually be:

Zone A: lobster

Zone B: crab

If both species can legitimately share the same temperature and water conditions, common treatment may be possible.

If not, one large chiller and one common sump may be the wrong “economy.”

This is why I want species names on the RFQ, not just:

Seafood.

Now 52 kg Becomes the Design Number

The restaurant normally holds 28 kg.

I ignore that for equipment sizing until I've checked the peak.

52 kg is what Friday asks the system to support.

A published study of commercial-style recirculating food-fish holding systems found that increasing density affected TAN and unionized ammonia, and researchers monitored TAN, nitrite, nitrate, dissolved oxygen, temperature, pH, conductivity, alkalinity, and turbidity throughout the holding period.

Those exact fish data should not be copied directly to lobster or crab.

The lesson is the useful part:

biomass changes treatment duty.

Now the schedule starts becoming real.

I Build the Equipment Schedule Backwards From Failure

Instead of listing equipment alphabetically, I ask what kills inventory first.

If the water gets too warm

Specify the chiller from:

total circulating volume + species setpoint + 32°C design ambient + pump heat + required pull-down time

Not simply “2 HP.”

The schedule should state:

Cooling capacity: ___ kW at ___°C ambient / ___°C water

For saltwater, I would also specify the wetted heat-exchanger material.

If oxygen falls

FAO treats oxygen replacement as a fundamental recirculating-system design calculation based partly on animal mass.

So I add:

dedicated aeration system

and, where inventory value justifies it:

backup aeration + DO monitoring/alarm

I do not make the return pump solely responsible for oxygen.

If ammonia rises

Now I need:

mechanical solids removal before the biofilter

plus

biological-media capacity sized for expected nitrogen load

FAO specifically warns that inorganic and organic material should be removed before biological filtration where necessary because solids can interfere with nitrification; nitrification also consumes oxygen.

The biofilter and air system are therefore not independent line items.

One needs the other.

The Schedule I Would Send Back to the Restaurant

At concept stage, it might look like this:

Notice how many cells still say to be declared .

That's deliberate.

At concept stage, false precision is worse than an empty box.

One Piece of Equipment I Would Delete From Some Restaurant Briefs

The oversized return pump.

It appears constantly.

Someone worries about water quality, so the solution becomes:

“Use a bigger pump.”

But more flow does not automatically mean more ammonia removal, more oxygen, or better solids capture.

FAO's treatment guidance separates hydraulic loading, ammonia loading, settling, biological filtration, and aeration as different design variables.

A pump moves water.

It does not replace those processes.

For a Ruibit commercial seafood system, I want enough flow to deliver waste to treatment and return conditioned water effectively—without turning the tanks into washing machines or wasting electricity through unnecessary head loss.

The Restaurant Manager Gets One Schedule. Purchasing Gets Another.

Operations needs:

What do I clean daily?

What numbers do I check?

What alarm means call someone?

Purchasing needs:

manufacturer/model

capacity

power

voltage

material

quantity

spare-parts requirement

warranty

substitution rules

I would not combine those into one enormous spreadsheet.

The operator should be able to look at one page at 6 p.m.

The procurement team should be able to identify exactly which pump failed three years later.

Different readers. Different schedule.

I Know the Brief Is Finished When I Can Simulate Friday Night

The final review is not:

“Do we have a chiller, pump, filter and air pump?”

It is:

52 kg arrives.

The room reaches 32°C.

The mechanical filter gets dirty.

One return pump trips.

Staff are busy serving dinner.

What continues running?

What alarms?

How long can the system maintain acceptable water conditions?

Can staff isolate one zone?

FAO's guidance on live crustacean holding repeatedly comes back to mortality, stocking density, circulated seawater, appropriate temperature, and minimizing holding stress.

That is what the equipment schedule is supposed to protect.

A restaurant brief describes what the customer wants to sell.

The equipment schedule describes what has to keep working so the seafood is still alive when somebody orders it.

FAQs

1. What information is needed before designing a restaurant seafood tank?

Provide species, normal and peak biomass, maximum holding time, target water temperature, maximum ambient temperature, available space, electrical supply, and maintenance frequency .

2. How should a seafood tank equipment schedule be created?

Convert the operating brief into equipment duties for mechanical filtration, biofiltration, circulation, aeration, chilling, monitoring, drainage, and backup systems .

3. Should seafood tank equipment be sized from average or peak biomass?

Use the maximum realistic biomass as a key design condition. A system designed only around normal inventory may become overloaded during large deliveries or busy weekends.

4. What should a seafood chiller specification include?

Specify cooling capacity in kW or BTU/h at defined ambient and water temperatures , required flow, heat-exchanger material, electrical input, temperature-control range, and restart behavior.

5. Why should backup equipment appear in the schedule?

Commercial seafood is valuable live inventory. Backup aeration, spare pumps, alarms, or independent zones can reduce the consequences of equipment failure during peak operating periods.