Bill of Materials (BOM)
Key Learning Points
Identify what is a Bill of Materials
Identify the purpose of a Bill of Materials
Identify the personnel involved in compiling a Bill of Materials and using a bill of materials.
1.1 Bill of Materials
A Bill of Materials (BOM) sometimes referred to as the Material Take Off (MTO) lists all the items that go into a finished project or subassembly of that project. The Bill of Materials can be structured in levels indicating all the steps to final completion. This can let the bill of materials look like a tree with the finished good or subassembly as root.
1.2 Purpose of the Bill of Materials
A bill of Materials has different functions depending on which level of the BOM you have and job description you are carrying out.
For example in pipe fitting you could have the following layers:
BOM for each individual piping isometric
BOM totals for all the piping isometrics for the clean steam system
BOM totals for all clean systems that use high purity piping
Customer name
Project description
Company Job Number
Person who prepared the BOM
Drawing number
Revision number and date
Component description
Component
Tell about fit up and complete detail of 45 degree offset
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Structure diagram
Isometric diagram
P& I'd information
Lay out of plan diagram
Pipe fittings
Material code of SS and CS and alloy and other material
Find out travels and degree in structure
Dummy support
How made elbow
Fabrication formula's
Piping best formula
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Degree cuts
Difference between tube and pipe
Measurement tape
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Rigging
Folding
Type of exchanger
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Project of oil and gas
Isometric diagram
American standard fitting of pipe
British standard of pipe and structure
Fertilizer projects
Hydro testing of pipe lines and exchangers
Maintenance of exchangers and column
Interview question and answer of piping and structure
Fabricator
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Supervisor
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Exchanger type
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Work with safety CALCULATING OFFSET FOR 45 DEGREE ELBOW
TAKE OFF 45 DEGREE ELBOW
CALCULATE TRAVEL
CALCULATE RUN
CALCULATE OFFSET
What is a pipe offset? What is a rolling offset?
In doing some pipe works, we sometimes encounter situations wherein we have to connect two lines of pipes that are not quite aligned with each other. These two pipelines could be offset horizontally or vertically. When we see a combination of both horizontal and vertical offset, or in other perspectives, a combination of offsets in two different directions, we call it a pipe rolling offset.
To deal with pipe offsets, we can use a bent pipe fitting to change the direction of the pipeline and another bent fitting to return to the final direction of the pipeline. In this calculator, we tackle how to find the travel length, which is the length of the diagonal that connects the two points at which the pipeline changes directions
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Material Size
Material Quantity
An example of a typical bill of materials is given on the next page.
2.2 Purpose of the Elements
The information recorded on a Bill of Materials is used to provide traceability and accountability for companies:
Customer Name: Often used as the first method of dividing and filing information.
Project description: Is used to sub-divide and file individual projects for one specific client.
Company Job Number: This is used to track cost elements in a project and is assigned to materials and labour so the all costs can be tracked.
Prepared by: This identifies who prepared the bill of materials and ensures accountability for it’s accuracy. In large organizations it also allows for someone to query information given in the BOM after it has been issued to site.
Key Learning Points
Identify the key elements of information for a Bill of Materials
Identify why this information is critical
Describe automated systems for generating bills of materials.
Pipefitting Drawing number, revision and date: This ensures traceability and is used to ensure that the most up to date information is being used.
Component description: Basic description of the component required, e.g. Pipe, elbow, flange etc..
Component specification: This gives detailed information on the material to be used. This information is used by the draughtsman to complete the drawing, the purchasing personnel to order the material and the pipe fitter to verify that he/she has received the correct material. This reference will call up a piping specification which will give detailed information on how the pipe line should be installed, supported, inspected, tested and much more.
Material Size: Indicates the size of the components required.
Material Quantity: Indicated the quantity of the components required.
14 окт 2024
