Piping Symbols for Isometric Drawing PDF: A Comprehensive Guide

Isometric drawings are a crucial aspect of piping design, providing a detailed representation of the piping system. In this article, we will delve into the importance of isometric drawings and highlight the key symbols used in piping systems.

Why Are Isometric Drawings Important?

An isometric drawing is a type of pictorial drawing that allows us to view three sides of an object simultaneously. In piping design, isometric drawings are essential as they provide a clear representation of the piping system, including its components, connections, and orientations. This drawing plays a vital role in ensuring the accuracy and integrity of the piping system.

Isometric drawings involve various symbols to represent different components, such as pipes, fittings, valves, and instruments. The following are some essential symbols used in isometric drawings:

1. Orifice Meter Taps Orientation: This symbol represents the orientation of orifice meter taps, which depends on the pipe direction and fluid type.

2. Minimum Gap Requirement between Welds: This symbol indicates the minimum gap requirement between welds to ensure proper connections.

3. Field Weld and Workshop Weld Identification: These symbols identify whether a weld is performed in the field or workshop.

4. Structural Penetration (if the line crosses any structure): This symbol represents the penetration of the piping system through any structural element.

5. Control Valve Location and Arrangement: This symbol indicates the location and arrangement of control valves within the piping system.

6. Continuation Isometric Drawing Number (if the complete line does not fit in a single sheet): This symbol provides information on whether the isometric drawing continues onto another sheet.

Other Important Symbols

1. Size, Location, and Type of Pipe: These symbols provide information on the size, location, and type of pipe used in the piping system.

2. Slope (if required as per project): This symbol represents the slope of the pipe, which may be necessary to ensure proper drainage or flow.

3. Line Elevations (it can be centerline or BOP elevation): These symbols indicate the elevations of the pipes, either as a centerline or Bottom of Pipe (BOP) elevation.

4. Angle Allocation and Direction (clockwise or anti-clockwise): This symbol represents the allocation and direction of angles within the piping system.

Points to Check at Drawing Area

When reviewing an isometric drawing, it is essential to check for the following:

1. Design Pressure and Design Temperature (It's not mandatory): These symbols provide information on the design pressure and temperature of the piping system.

2. Insulation and Heat Tracing Type (If the line is insulated only): This symbol indicates whether the pipe is insulated or heat-traced, if necessary.

3. Project Name, Project Code, and Area Code: These symbols provide essential information about the project, including its name, code, and area.

In conclusion, isometric drawings are a vital component of piping design, providing a detailed representation of the piping system. By understanding the key symbols used in isometric drawings, designers and engineers can ensure accuracy and integrity in their designs. This article has highlighted the importance of isometric drawings and provided an overview of the key symbols used in piping systems.

References

* '1' ASME B31.4-2018: Pipeline Transportation Systems for Liquid Hydrocarbons and Natural Gas

* '2' API 650-2017: Welded Steel Tanks for Oil Storage

Piping symbols for isometric drawing pdf