Addison Project employs specialist mechanical design engineers who are supported by a team of 3D AutoPlant designers, 2D Design Detailers and CAD operators. 

Our core area of experience is in the industrial sector, where proficiency has been gained through understanding sector specific problems and adapting to precise requirements.

Our range of mechanical services includes:

  • 3D Design and Modelling
  • General arrangements
  • Laser scans
  • Equipment arrangements and Isometrics
  • Visualisations
  • 2D Design
  • Schematic layouts
  • Detail drawings
  • Feasibility studies
  • Survey reports
  • Tender and enquiry specifications
  • Installation procedures
  • Scope of work specifications
  • Sanction grade estimates
  • Risk assessments

Specialist services include:

Pipe Stress Analysis

Addison now have the ability to perform pipe stress analysis in-house utilising the latest CEASAR II software.

CAESAR II is the market leading software for pipe stressing. It uses beam theory to evaluate piping systems and plants to international standards. CAESAR II does not use the conventional FEA Analysis that many stress packages use, but instead uses stick models comprising of elements connected by nodes. CAESAR II uses computational codes from inputted data to determine whether a particular pipe network, vessel or plant will pass or fail during operation.

CAESAR II uses three load cases to determine the feasibility of a system.

  • Sustained Loads: Those due to forces present during normal operation.
  • Occasional Loads: Those present during rare intervals of operations.
  • Displacement Loads: Those due to displacement of pipe.

This capability, twinned with our general mechanical and specifically piping design expertise and experience, now means that Addison can be your complete piping design solution.

Pressure Relief – Requirements & Equipment Sizing

Addison Project has a multidiscipline team specialising in the assessment of pressure relief requirements. With over 30 years experience of solving real pressure relief challenges across a wide variety of industries, our team has unrivalled knowledge and understanding of the field.

Pressure relief is about cost effective and pragmatic risk management. Design and installation forms only a small part of the overall cost of a pressure relief system; the largest cost element is the effective inspection and maintenance of that relief system.At Addison, we consider the whole life cycle cost- not just the design. By ensuring the design is right, significant cost savings are made through reduced operating costs and the elimination of potentially expensive failures.Our low overheads and flexible working arrangements allow us to provide a cost effective and safe solution to your problem. This will be carried out on time, to your requirements and within budget. We can undertake pressure relief work on a fixed price basis, rate basis or target cost basis, regardless of size. Our services include:

  • Site audits
  • Design reviews
  • Pressure systems rating
  • Relief case identification
  • Relief case calculations
  • Relief device sizing
  • 2-phase flow (DIERS)
  • Chemical reaction hazards
  • Relief capacity calculations
  • Device selection and specification
  • Legislative compliance
  • Pipework sizing
  • Piping detail design
  • Pipe stress analysis
  • Discharge & disposal
  • Inherent safety


What our clients say

“"I’d just like to let you know how impressed I’ve been with the way your engineers have worked together with us on this project."”

Working Together


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General Enquiries:

Career Enquiries:

Project Enquiries:

Hillhouse: 01253 898 200

Daresbury Park: 01928 786 000

Teesside: 01642 694 000

Precision Enquiries:

T: 01253 898 292

Engineering Enquiries:

T: 01253 898 280

Regional Offices:

Hillhouse Business Park, Thornton Cleveleys, Lancs, FY5 4QD

Daresbury Park, Warrington, Cheshire, WA4 4BS

Riverside Park, Middlesbrough, Teesside, TS2 1RU

Find us on LinkedIn:

Project, Precision, Engineering.