Instrument Bill of Material

What is an Instrument Bill of Material?

A Bill of Material (BOM) is a complete inventory of all the parts and components that comprise an object or assembly; it is also a component of material requirement planning (MRP).

Detailed Explanation of Instrument Bill of Material

  • BOMs also have instructions on how to get the materials and how to use them. A BOM is sometimes called a product structure or an assembly component list.
  • An instrument Bill of Materials (BOM) lists all the spare parts that can be used to repair an item of instrument, so that instrument maintenance engineers can quickly find the right part, find it in stock, or make a request to buy it by using the part number and vendor information.

What is the purpose of the instrument Bill of Material (BOM)?

The instrument bill of materials is mostly used to figure out how much of each item is needed for a project. It displays all essential materials and their pricing for project engineering and helps calculate the project’s budget.

You can build the composition of specifications allocated to the material in the SAP product component based on the material’s BOM.

The instrument BOM is an important resource for those who design, build, and maintain the instrument, as it provides a comprehensive overview of all the parts and systems that make up the device.

What are the five major parts of a bill of material?

There are several standard components that are typically included in a bill of material (BOM). The specific information and format of the BOM may vary depending on the type of product and the needs of the organization while creating it, but in general, a BOM will include the following five major parts:

  • Part Number
  • Part Name
  • Description
  • Quantity
  • Unit of Measure

Part number:

This is a unique identifier for each part or component in the BOM. The part number may be assigned by the manufacturer or the organization creating the BOM.

Part name:

This is a descriptive name for the part or component. It should be specific enough to accurately identify the part, but not so technical that it is difficult to understand.


This is a detailed description of the part or component, including its function and any important specifications or characteristics.


This is the number of units of the part or component that are needed to complete the product.

Unit of Measure:

In a bill of material (BOM), the unit of measure is typically included alongside the quantity of each part or component. This helps to ensure that the correct amount of each item is ordered or used during the manufacturing or assembly process.

For example, if a BOM specifies that a particular part is needed in a quantity of “10” with a unit of measure of “each,” it means that 10 individual units of that part are required.

What we should include in a multi level bill of material?


The BOM’s item category will tell you if the material can be kept in stock, can’t be kept in stock, or is a text item. When the BOM is copied to the production order, this item category is also copied to the order.

Part Image:

A picture of the item might be included for easy reference.


 If you will be purchasing components from an external seller, please include their names and contact information (rather than making it in-house)

Unit Cost:

Cost per unit of each part or component, as well as the cost per unit, will help you scale up your production if you need to place another order.

Total Cost:

The overall price of each part is determined by multiplying its quantity by its unit price.

Contact Information:

This can be the contact information for team members, management, stakeholders, or any external vendors or suppliers that are important.

Making Vs Buying:

You may also add a section for indicating whether you will be making each element or component yourself or purchasing it instead.

What does an instrument BOM contain?

Instrument Bill of Materials is a document that mostly has a list of things like cable trays, junction boxes, tubes, pipes, and fittings, air headers, cable glands, hook-up materials, stanchions, and steel needed for the installation of instruments.

The instrument BOM typically includes the quantities and specifications of each part, as well as its manufacturer and part number. It may also include information about the assembly and testing of the instrument, as well as any required maintenance or repair procedures.

The Instrument Bill of Materials includes the following details:

  • Item number with Description
  • Item Size
  • Material code of the Item
  • Quantities Required

What is the use of an Instrument Bill of Material?

The Instrument Bill of Material is primarily used to determine the quantity of each item required for a project. It displays all necessary supplies and pricing for project engineering and assists in calculating the project’s budget.

The following benefits come along with using a bill of materials template:

Use a bill of materials template to streamline your procedure and make sure you have all the relevant details. The main benefits of using a template are the following:


You’ll make sure you have all the information you need to make a successful, up-to-standard product by creating a consistent ordering process.


You may always modify the template to meet your requirements, even while it serves as a reference for what to include in your bill of materials.

Standardized Communication:

When you use a template, you are more likely to order materials for each production cycle using the same communication methods. So, team members, suppliers, vendors, and management can all follow the process to make an accurate list of all the parts you need and the information you need to support them.

Controlled inventory levels:

If you use templates correctly and often, they can help you predict how much inventory you’ll need, so you can plan ahead and reduce waste.

Successful Product Realization:

In the end, using a bill of materials template will best set you up for a successful production cycle.

A simple example of an instrument bill of materials of a Burner system is shown below

instrument bill of materials of a Burner system1

A simple example of an instrument bill of materials of a control valve is shown below

instrument bill of materials of a Burner system 2

Different types of Bill of Material Templates for download

Sundareswaran Iyalunaidu

With over 24 years of dedicated experience, I am a seasoned professional specializing in the commissioning, maintenance, and installation of Electrical, Instrumentation and Control systems. My expertise extends across a spectrum of industries, including Power stations, Oil and Gas, Aluminium, Utilities, Steel and Continuous process industries. Tweet me @sundareshinfohe

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