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Kitchen Design Guide

Specification

Aluline will provide you with complete specification for your consideration. Ideally this should be implemented at design stage whether new build or retro-fit.

Constructing tailor made solutions: Our services are entirely bespoke and based on individual delivery plans for each premises or project, we produce site surveys to ensure your understanding.

Sizing Biological Grease Separators

In accordance with current guidance from Water Authorities, dishwashers and waste disposal units should not be connected to grease separators.

Sizing AG Series

Please refer to the chart on the relevant page for the grease trap sizes.

To determine the size of grease trap, calculate the volume of water, divide by the discharge time (2 minutes).

Example:

Sink Size

2 x 400 x 400 x (250), overflow height (OH) is 220. Volume is 2 x 400 x 400 x 220 = 70.4L

Sink Size

l x 500 x 400 x (300), overflow height (OH) is 220. Volume is 31 x 500 x 400 x 220 = 44.0L

Total Volume = 114.40L

Size of Grease Trap

114.4L divided by discharge time (2 Min) = 57.2L

Use AG2 (115L) for Above Ground Series.

L cubic m = 1 tonne -1000L

The calculation of Grease/Oil Interceptor size is not an exact science, factors to account for are: type of premises, cleaning regime, staff training, frequency of cleaning, available space for fitting, place of trap eg: above floor/below floor inside kitchen-outside kitchen. Supplier should have experience to advise on trap sizing, training & cleaning frequency.

The actual loading should be assumed to be 60% of the above value, as most appliances and fixtures are not filled to the brim. In many cases, these fixtures are filled to less than 60% of the capacity, especially when water is at premium. Most large businesses reduce water consumption to attain economic and environmental benefits and reduce carbon footprint.

Sizing UG Series

We use the same methodology for the Under Ground series (however as a rule of thumb) we advise using one size larger to reduce the cleaning regime.

When specifying Under Ground Traps, the T-Dimension or invert level, it is important to ensure that the lid is at a finished level and increment cost can be calculated for bill of quantities.

Access to final position for cleaning is important during the specification stage.

Flow Rating

A 2 minute drainage period is acceptable for commercial fittings to fully discharge. To calculate the flow rating, simply divide the litre capacity of the kitchen fixtures and equipment by 2 (drainage period) to give flow rating in litres/minute then divide by 60 to calculate litres/second.

Example

59.4 litres multiplied by 0.60 to give actual loading for a single catering sink = 35.64 litres. This is then divided by 2 = 17.83 litres per minute or 0.297 litre per second.

Under European Legislation, dishwashers are assumed to have flow rating 2 litres/second.

Specialist manufacturers of stainless steel DRAINAGE Grease/oil separators Gullies/Channels Bio-remediation stations.STPs, Aluline – Engineered for Compliance. Built for a Cleaner Future.

Welcome to Aluline, where engineering excellence meets environmental responsibility. With over 30 years of experience, we design and manufacture high-performance grease traps, stainless steel drainage, and biological grease management systems that protect commercial kitchens, infrastructure, and the planet.

From hospitality and healthcare to MOD and industrial sectors, we serve organisations that demand proven, sustainable results — not gimmicks.

Proven Compliance, Every Time

At Aluline, we understand that compliance isn’t optional — it’s critical. Our systems are built to meet and exceed all relevant standards, including EN 1825 and Water Authority discharge limits, helping your business avoid costly fines and maintain uninterrupted operation.

Our grease traps and biological dosing solutions are designed to physically and biologically remove food, oil, and grease (FOG) from wastewater before it enters drainage systems, allowing you to demonstrate environmental due diligence with full documentation.

Whether you operate a restaurant chain, hospital, MOD facility, or manufacturing site, Aluline gives you clear proof of performance and audit-ready records for local authorities and water companies. You’re not just managing grease — you’re demonstrating best-in-class environmental stewardship.

Environmental Impact You Can Measure

Our mission goes beyond compliance — it’s about actively preventing pollution. Aluline systems divert tonnes of food waste, oil, and grease from landfill and sewer lines every year, significantly reducing methane, carbon dioxide, and other greenhouse gases (GHGs) associated with food breakdown and wastewater contamination.

By removing FOG before it enters the sewer network, our technology prevents the formation of fatbergs, reduces strain on sewage treatment plants, and lowers carbon emissions from unnecessary tanker call-outs and reactive maintenance. Every kilo of FOG intercepted is a direct win for the environment.

We can even help you quantify your carbon savings — offering real, reportable data on how much organic waste your site is intercepting and preventing from becoming GHG emissions. For ESG reporting, tenders, or internal sustainability goals, Aluline systems give you the facts, not just promises.

Long-Term Value and Expertise

All Aluline units are manufactured in the UK from high-grade, 100% recyclable stainless steel. Engineered to last 30+ years with minimal maintenance, our equipment outperforms plastic or imported alternatives in both durability and environmental impact.

We offer end-to-end service: from site consultation and design to installation, compliance checks, and aftercare. Our in-house teams and national service network ensure continuity, support, and performance monitoring – backed by real expertise, not box-shifting.

Whether you need a bespoke kitchen drainage system, a compact biological grease trap, or a complete upgrade to meet water authority standards, we provide tailored, compliant, and cost-effective solutions that stand the test of time.

Partner with Aluline

For organisations serious about compliance, sustainability, and operational resilience, Aluline offers more than a product — we offer a partnership built on decades of knowledge, technical innovation, and measurable environmental outcomes.

Get in touch to arrange a site assessment or request a tailored specification. Let’s build something better — for your kitchen, your business, and the environment.