Reconstruction and development of drawings

If, for any reason, you do not have the design and operating documentation for your facility, order a P&ID and PFD process drawing reconstruction and development service. Viravix Engineering engineers will prepare working diagrams of your dairy plant and individual equipment units: pasteurizers, CIP washers and other units.

What are p&id and pfd drawings

Process flow diagrams and drawings are needed by plant technicians to manage operations and to plan repairs, modifications or dismantling. They clearly show the main structural units of the equipment and the connections between them.

There are two basic types of diagrams.

PFD (process flow diagram)

It is a general flow chart depicting units of major equipment and the flows of raw materials between them. The PFD gives an idea of the connections between components in a process, the flow of the process.
Chief engineers and project managers use PFDs to plan plant or shop floor improvements. It is also useful for training new employees on the basis of such drawing
What a PFD can include:
  • pieces of equipment;
  • process piping;
  • designations, names and identification numbers of objects;
  • controls;
  • valves;
  • connections with other processes;
  • main, reserve and recirculation lines;
  • nominal and operating parameters of the process (temperature, pressure);
  • composition of fluids in the system.

P&ID (Piping & Instrumentation Diagrams).

This is a diagram of the piping, valves, pumps and instrumentation. The PID diagram is more detailed than the PFD diagram and is therefore intended primarily for operating personnel as well as installation and service technicians.
What a P&ID can contain:
  • names, designations, numbers, dimensions of elements in the diagram;
  • measuring instruments;
  • mechanical equipment;
  • all valves;
  • process piping;
  • vents, drains, special fittings, sampling lines, reducers, expanders and samplers;
  • permanent start-up and flushing lines;
  • flow directions;
  • links to interconnections;
  • control inputs and outputs, interlocking interfaces;
  • input data;
  • other data as required by the customer.
Both types of schemes are required in the technical operation of the main and auxiliary equipment: PFD and P&ID.

Why drawings are needed

Each production facility must have a set of technical documentation, including process flow diagrams. The drawings are updated with the frequency specified in the regulatory requirements (usually once every 3-5 years) or after each change in the equipment, process.
Where p&id and pfd schemes are used:
  • process design and process modification;
  • calculating raw materials, materials;
  • drawing up equipment specifications;
  • implementation of automated production control systems;
  • HAZOP (hazard and operability study) analysis;
  • planning of works on maintenance, repairs, modernisation of equipment;
  • development of production regulations, instructions, flow charts, PPP;
  • Training and retraining of maintenance workers;
  • planning of works on reduction of water, electricity, heat and other utilities consumption.
For various reasons, up-to-date flow charts may not be available. For example, the dairy has been in operation for a long time and some of the schematics have been lost; or all changes and alterations during operation have not been documented. Or the seller of the equipment has not provided a complete set of drawings.

In such cases, the service of restoring and developing flowcharts comes in handy.
What will be required to develop p&id and pfd drawings:
  1. Computer aided design system (CAD) software compatible with the drawing requirements of the company. The software must be available to the drawing developer.
  2. Lists of process elements.
  3. Description of input, output main and auxiliary flows.
  4. Boundaries of equipment installation.
  5. Identification of all components in accordance with the company's system - the drawings must be clear to users.
  6. Types and characteristics of materials to be used.
  7. Energy balances for each line.
We set out a specific list of inputs required from the customer in the terms of reference of the contract.

Stages of work

  1. Data analysis
  • Gather background information for the design through a survey of the installed equipment.
  • Study customer documentation with drawing and project management requirements.
  • Analyse input data.
2. Design
  • Develop pfd diagram and p&id drawings.
  • Prepare data sheets for equipment.
  • Draw up a table with technical data and final report.
3. Review by customer and delivery
  • Submit set of documents for review.
  • Making corrections to customer comments, if any.
  • Approve the report and sign the work report.

Who are we

"Viravix Engineering" is a team of process engineers in the food processing industry.
Each of our specialists has worked their way up from the rank-and-file equipment maintenance worker to an area expert supervising 10-20 plants