In this article, we will provide an overview of the mud pump and discuss the pre-startup inspection process using the FMC W1122BCD pump as an example. A mud pump is an essential piece of circulation equipment used to supply and remove drilling fluid from the well being drilled. The pump we will focus on is commonly utilized in vertical, column, and various other drilling operations. It is a component of Boart Longyear, Christensen, VLD, Sandvik, and other models, and is also incorporated into the TRIDO-140 pumping station manufactured by Atlas Copco. The circulation pump plays a crucial role in supplying and circulating the fluid in the well, ensuring proper flushing of the well and maintaining the integrity of the borehole walls with the drilling fluid.

Before starting the mud pump, it is necessary to perform a comprehensive inspection to ensure its proper functioning. The inspection process consists of several stages, which we will outline below:

Stage 1: Visual Inspection

Begin the inspection by conducting a visual examination of the mud pump. Check for any signs of physical damage, such as cracks, leaks, or loose connections. Inspect the pump's components, including the valves, pistons, liners, and seals, to ensure they are in good condition and free from any visible defects. Additionally, examine the pump's motor and electrical connections for any signs of wear or damage.

Stage 2: Oil Checking

Next, it is important to check the oil levels and condition in the mud pump. Follow the manufacturer's guidelines for the recommended oil type and ensure that the pump is filled to the appropriate level. Check for any signs of oil contamination, such as water or debris, which may indicate a potential issue with the pump. If necessary, drain and replace the oil to maintain optimal performance. Make sure that the magnetic drain plug in the bottom of the pump casing is tightly closed. Check the oil level through the drain valve; if necessary, add oil through the oil filling neck. Note that the oil level should be at the level of the drain valve behind the drive part of the pump.

Stage 3: Functional Testing

After completing the visual inspection and oil checking, proceed with functional testing. Start the mud pump and observe its operation. Pay close attention to the pump's pressure, flow rate, and overall performance. Verify that the pump is operating within the specified parameters and that all controls and safety features are functioning correctly. If any abnormalities are detected during the functional testing, further investigation and necessary repairs should be carried out before startup. The third stage involves checking the entire pump installation for seal integrity.

Stage 4: Documentation

Throughout the inspection process, it is essential to document your findings and any actions taken. Maintain a detailed record of the inspection results, including any observed issues, repairs performed, and maintenance tasks completed. This documentation will serve as a valuable reference for future inspections and will contribute to the overall maintenance history of the mud pump. Every 1000 hours of operation, introduce grease through 3 grease fittings.


By following these recommended steps and conducting a thorough pre-startup inspection, you can ensure the reliable and efficient operation of your mud pump. Regular inspections and proper maintenance will help minimize downtime, extend the lifespan of the equipment, and contribute to the overall success of your drilling operations.

Remember to always refer to the manufacturer's specific guidelines and recommendations for inspecting and maintaining your mud pump, as different models may have unique requirements.