BILL OF MATERIAL ( BOM )

ImageBills of material used in plant maintenance are called maintenance bills of material (maintenance BOMs).

The main goals of  bills of material on plant maintenance are:
  • ·Description of the structure

A maintenance BOM describes the structure of a technical object or material.  It can help you determine on what part of technical object maintenance work has to be carried out.

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  • ·Listing of spare parts

A maintenance BOM is used in plant maintenance for linking spare   parts to a technical object or material.

BOMs are used in plant maintenance for the following functions:

  • Assigning spare parts to task lists
  • Assigning spare parts to maintenance orders
  • Localizing damages (identifying maintenance assemblies in maintenance notifications or orders)

We can Allocate Bill of Materials ( BOM ) in 2 ways:

1) Direct Allocation

  • ImageWhen you allocate a BOM directly, you link one object (piece of equipment, functional location) to a BOM.  The BOM can only be used by this object in maintenance orders, maintenance notifications, maintenance plan items, etc.

2) Indirect Allocation

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  • When you allocate a BOM indirectly, you link the master record of a technical object with material master record which has its own BOM.  You do this with the help of the field “Construction type”.

Below is a sample of PLant Maintenance BOM defined in SAP:

ImageIn this example, in Plant Maintenance,  make an assembly ( the ones in yellow ) and combine it with a particular material ( the ones in red ) so that we can make a Bill of Material.

Note: All the Materials(spare parts) should be defined first in SAP so that you can use them. You can also attach a Text Item or Non-Stock Item also depending on your requirement.

 

 

PLANT MAINTENANCE REFURBISHMENT PROCESS

ImageHere is a sample on how a Refurbishment is being done in Plant Maintenance:

ImageProcurement of spare parts: For certain high-value components you procure spares in order to be able to replace the component immediately in the case of a breakdown.  Procurement of spares is handled by Material Management.  The spares are ordered and delivered.

Withdrawal of repairable spares/return of defective repairable spares: When a repairable spares item becomes defective, then it must be replaced with another suitable one.  The defective part is removed and sent back to the warehouse while a replacement spare part is withdrawn from the warehouse and installed in its place.
Creating a refurbishment order: When the number of defective repairable spares in the warehouse has reached a certain level, the maintenance planner in charge creates a refurbishment order.  The planner defines the timeframe for the refurbishment and plans all the operations materials, tools, etc. required for the refurbishment.
Order release: After planning has been completed, the refurbishment order is released.
Withdrawal from the warehouse: The defective/used repairable spares as well as any additional materials planned in the order which are needed for the refurbishment are withdrawn from the warehouse.
Confirmation: The work done, the refurbishment order is confirmed by the employees concerned.  These confirmations show the work progress.
Return to warehouse: The repaired/refurbished parts are returned to the warehouse in accordance with the planning in the order as a goods receipt.  To this end, you can call up the object list from the refurbishment order as a reference.  It helps you identify individual repairable spares.  If an item cannot be refurbished, cancel the reservation and post it to scrap.
Order completion: The order can be completed as soon as refurbishment is finished.