Effectively managing spare parts inventory is crucial for maintaining smooth operations and efficient stockroom management. Spare and critical parts are vital for the success of manufacturing businesses, especially when equipment failure or issues arise. Proper spare parts supply chain risk management relies on well-organized processes, reliable inventory software, and strong management oversight.
In many cases, spare parts warehouses and inventories don’t receive the attention they need to operate efficiently and accurately. Common reasons for these challenges include:
- Spare part stockrooms often don’t directly generate revenue, leading to fewer resources allocated to them.
- Inventory tracking for spare parts is not prioritized.
- Inventory management software may be underutilized or unable to manage stock accurately.
- Barcodes are not used to track inventory movements, or the perceived effort to implement them is too high.
- Poorly documented processes or inefficient workflows contribute to human error.
- Improper inventory levels and poorly managed inventory costs.
- Inadequate management or staffing.
This lack of focus on spare parts inventory control, combined with underutilized inventory management software, can be costly and disruptive.
However, implementing effective practices can help avoid problems and ensure the smooth operation of your parts warehouse. An accurate inventory system enables the parts department to respond proactively and efficiently to plant needs. Companies can save considerable money by avoiding unnecessary rush orders for parts that are already available in the warehouse. Below are nine best practices for improving spare parts inventory management:
1. Systematically Identify All Parts
A key aspect of managing spare parts effectively is having a well-organized system for tracking all inventory and transactions. For such systems to function effectively, each inventory unit must be properly identified and recorded. This includes:
- Ensuring all SKUs are logged into the inventory management system.
- Using manufacturer barcodes or creating internal barcodes for tracking.
- For smaller items like screws and bolts, label the bin with a barcode for easy scanning.
- Discontinuing older or unused spare parts to prevent accidental reordering.
- Properly maintaining Bills of Materials (BOMs) within the system to ensure accurate inventory levels.
- Utilizing RFID asset tracking when necessary.
It is critical that all spare parts and inventory levels are managed and maintained in the inventory system, including units that are set aside for recycling, remanufacturing, testing, or destruction. This helps ensure that inventory remains as accurate as possible.
2. Effectively Manage Unused Parts
During major overhauls or repairs, some parts may be purchased for one-time use. These parts might not be stocked regularly and may not be recorded in the inventory system. Once the machinery overhaul is completed, or unplanned downtime repairs are made, any unused parts that could have future use should be inventoried. Other equipment in the plant might be able to use these parts.
Instead of storing unused parts in a box, workbench, or cabinet, they should be added to the inventory control system and placed into the parts inventory. This ensures that valuable parts are accounted for and available for future use.
3. Utilize, Manage, and Maintain Bill of Materials (BOM)
Another critical element of spare parts management is maintaining accurate Bills of Materials (BOMs). BOMs simplify the process of ordering parts and placing work orders. It’s important to keep BOMs up to date. Failing to update them can lead to inaccurate inventory levels due to missing or outdated parts.
Accurate BOMs also assist with preventive maintenance (PM) schedules. In some systems, the PM schedule will automatically generate a work order with a scheduled date for maintenance. BOMs must be updated in real time to prevent issues in inventory and work order management.
4. Streamline the Work Order Process
To improve spare parts efficiency, it’s important to have a well-organized, yet simple, work order process that everyone can follow. Work orders need to be created for all spare parts issued, ensuring inventory accuracy. Centralized inventory systems can greatly simplify this process.
Develop a work order process that provides all the necessary information without being too complicated. If the process is too complex or employees can bypass it, inventory inaccuracies will arise.
Additionally, ensure that non-emergency work orders are submitted in advance. Work orders can then be prepared, pulled, and staged for pickup or delivery, reducing wait times for the maintenance department.
5. Adopt Security Measures
Implementing effective security practices in the parts warehouse is essential to maintaining inventory accuracy. Several critical measures should be taken:
- Limit access to the parts inventory to authorized personnel only. Parts should be kept off-limits to non-warehouse employees.
- Install physical security measures such as counters or barriers that prevent unauthorized access to inventory locations.
- Use security cameras and badge access systems to monitor entry and exit points.
- Consider equipment like vertical lift modules for spare parts, which provide strict security and control over inventory.
6. Centralize Inventory and Consolidate Spare Parts
Centralizing inventory helps provide greater control over stock levels. Whenever possible, consolidate satellite parts inventories into the main warehouse. Centralized inventory ensures that a core group of personnel is responsible for managing all stock levels, real-time inventory tracking, and control.
Centralizing inventory also helps limit access to stock and minimizes human error. Additionally, managing a single, centralized inventory system makes security easier to implement and maintain.
7. Utilize an Inventory Control System
Using an ERP’s warehouse functionality or a Warehouse Management System (WMS)—rather than relying on spreadsheets—to manage spare parts inventory ensures accuracy and simplifies the management of the parts warehouse.
Incorporating barcodes and scanning technology with the system will greatly improve efficiency and inventory accuracy. Inventory management systems help control the physical asset through various functions like receiving, cycle counting, stock moves, stock adjustments, and inventory item issuance.
8. Assign Every Spare Part a Stock Location
Ensure that stock locations are defined in detail, ideally down to the bin and slot level for each SKU. It’s important to avoid vague location identifiers, such as a shared shelf where multiple parts are stored together. This makes it difficult for employees to find the correct part when needed.
This discipline in stockroom management ensures parts are stored in an organized manner and can be easily located when required.
9. Implement Strong Spare Parts Inventory Management
At the core of effective spare parts inventory management are robust processes, such as cycle counting, physical inventories, and proper management of discrepancies. A successful inventory management program requires the following:
- Well-documented processes that everyone follows.
- A consistent cycle count routine to monitor inventory.
- A comprehensive annual physical inventory count, unless cycle counting is already well-regimented.
- Management of inventory discrepancies and their timely reporting.
- Real-time inventory transactions across all functions.
- Well-trained managers and staff who are held accountable for accurate records.
These strategies help ensure that your stockroom and warehouse run as efficiently as possible and reduce the risk of human error.
Summary
Unplanned downtime, asset failure, and critical equipment issues can challenge even the best spare parts inventory systems and stockrooms. To optimize inventory management, it’s important to maintain accurate inventory records, pull the correct items from stock, and ensure timely receipt of parts back into the warehouse.
Training staff, limiting access to inventory, and holding personnel accountable for accurate records are crucial. Furthermore, consulting with a warehouse expert can greatly enhance your overall spare parts inventory management and operational efficiency.
