Piping engineering is a specialised branch of engineering dealing with design & layouts of piping network along with the Equipments in a process plant.

These layouts from a complete blue print of the plant & are used for plant construction at site. The most important factors to be considered’ are process requirements, safety, operability, maintenance, compliance with statutory requirements & economy Responsibilities piping design engineer begin with:

  • 1) Preparation of plot plan, equipment layouts piping studies, piping specification;
  • 2) Review of process package;
  • 3) Giving inputs to civil, vessel, electrical / instrumentation groups for various purposes.
  • Goes through:
  • 1. Preparation of piping layouts, isometrics, support Drawings;
  • 2. Stress analysis
  • 3. Procurement assistance;
  • 4. Preparation of drawings for statutory approvals;
  • 5. Preview of vendor drawings;
  • 6. Coordination with various engineering groups & site.

And ends with completion & commissioning of plant.

Responsibilities of piping engineer

Most important documents produced by design engineer:

Arranging all plant units in a logical manner to take care of Material flow, statutory requirements, & good engineering Practices.

Document showing layout of all equipments satisfying the Process requirements, safety & statutory Regulations, operability ease of maintenance & economy.

Document showing layouts of piping network to carry fluids From one equipment to another in a process plant satisfying The requirements as mentioned above.

Activities of piping design engineer

Review of process package

This activity is carried out prior to start the detail engineering to ensure availability of all the required process data by all engineering groups. This includes the following:

  • 1) Process data required converting P & ID’s to piping layouts like a proper identification of valves, strainers, In-line instruments,
  • 2) Utility summery giving utility consumption for each equipment with duty conditions like pressure, temperature etc.,
  • 3) Conceptual equipment layout drawings for process plant reflecting the process constraints.
  • 4) Process data sheets for equipments.
  • 5) Hazardous area classification etc..

Design planning

Following information is required for planning the various design activities

  • 1) Contract instructions,
  • 2) Project design basis & scope of work,
  • 3) Basic engineering Documents.
  • 4) Site design data including facilities around the plot,
  • 5) Contour & survey drawing,
  • 6) Applicable codes, standards & statutory regulations,
  • 7) Project schedule & network,

With all this data plan the detail engineering activities.

Basic engineering documents

These mainly cover the following documents:

  • 1) Plot plan;
  • 2) Equipment layouts
  • 3) Pipe rack study sketches;
  • 4) Study piping layouts;
  • 5) Piping specification;
  • 6) Utility distribution diagrams;
  • 7) Line list & critical line list;

Details engineering documents

These mainly cover the following documents:

  • 1) Piping layouts drawings;
  • 2) Material take off (MTO / BOM) for piping items;
  • 3) Nozzle orientation for fabricated equipments;
  • 4) Stress analysis;
  • 5) Piping isometric drawings;
  • 6) Piping support drawings;
  • 7) Fire fighting specification
  • 8) Drawings for statuary approvals

Other activities

These mainly cover the following documents:

  • 1) Review of drawings for machinery & other brought-outs;
  • 2) Review of drawings for special piping items;
  • 3) Specification for bellows, spring, hangers etc.;
  • 4) Specification for insulation & painting of equipments & piping items;
  • 5) Updation of P&ID’s based on detailed engineering,
  • 6) Scheme for the erection of equipments in consultation with site engineer.

Review of process package

Following information shall be available in P &ID’s:

  • 1) ) Legends, notes, abbreviations
  • 2) Line numbers;
  • 3) Location of change in piping specification;
  • 4) Specific requirements like slope, elevation difference break flanges. Minimum running length, process drains & Vents type of heating (jacketing /steam i electric heating) etc.;
  • 5) Proper symbols for piping items;
  • 6) Equipments & nozzle numbers;
  • 7) All instrumentation & control valves, etc;
  • 8) Continuation sheet numbers etc.

1) Utility summary:

This document shall reflect the various utilities consumed by each equipments with duty conditions like pressure, temperate, flow, state of fluid, critical data like freezing point etc.

2) Conceptual equipment layouts:

This document gives the general arrangement of the Equipments considering the process requirements like Inter-distances & approximate elevations of the equipments;

3) Piping material specification:

Basic material for piping items, valve specifications, special, flanges & gaskets required , any other specific requirement.

4) Type of storage required:

This document shall mention the state of the fluid & type of equipment to be used for the storage like API Tank, silo, dehumidified atmosphere (warehouse), bullet horizontal / vertical) etc.

5) Hazard classification:

This documents gives the type of hazard for the fluids being handled ( like class a/b/c, flammability toxicity etc.) & the special precautions to be taken care.

6) Future expansion requirements:

These are to be mentioned by the client & to be taken care for the space requirement during the layout stage.

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