To Next PageTo Next Page
Need help?Do you have a question about the PEERLESS 4TU11A2 and is the answer not in the manual?
Details on disengaging coupling halves, referring to manufacturer instructions.
Steps for disassembling the pump, including removing glands, casings, and bearing caps.
Instructions for disassembling the rotating element of the pump.
Cleaning procedures for all metal parts after disassembly.
Detailed steps for cleaning pump bearings.
Visual and detailed inspection of pump parts for damage and wear.
Procedures for making necessary repairs to pump components.
Step-by-step instructions for reassembling the pump's rotating element.
Final assembly steps for the pump casing and components.
Reinstalling plumbing for water-cooled bearings.
Instructions for testing the pump after repair.
Diagnosing and resolving common pump malfunctions.
Recommendations for stocking essential spare parts.
Information required for ordering spare parts efficiently.
The Peerless Pump Type TU, TUF-2 Stage, and TUT, TUTF-3 Stage Centrifugal Pumps are designed for reliable liquid transfer, offering robust performance across various applications. These pumps are engineered for efficiency and durability, with specific models tailored for either grease-lubricated or oil-lubricated bearings to suit different operational environments and maintenance preferences. The multi-stage design allows for the generation of higher pressures and flow rates, making them suitable for demanding tasks where single-stage pumps might fall short.
These centrifugal pumps operate by converting rotational kinetic energy into the hydrodynamic energy of the fluid flow. The fluid enters the pump impeller along or near the rotating axis and is accelerated by the impeller, flowing radially outward into a diffuser or volute casing, from which it exits into the discharge piping. The multi-stage configuration means that the fluid passes through multiple impellers in series, with each stage increasing the fluid's pressure. This design is particularly effective for applications requiring high head or pressure.
The pumps are available in two main lubrication types: grease-lubricated and oil-lubricated bearings. Grease-lubricated systems, as shown in Figure 1 for TU, TUF-2 Stage pumps and Figure 2 for TUT, TUTF-3 Stage pumps, are often chosen for their simplicity and reduced maintenance frequency in certain environments. Oil-lubricated systems, depicted in Figure 1A for TU 2 Stage pumps and Figure 2A for TUT 3 Stage pumps, typically offer better heat dissipation and are preferred for higher speed or temperature applications, or where more precise lubrication control is desired. Both systems are designed to ensure smooth operation and extended bearing life.
Key components contributing to the pump's function include the shaft, impellers (right-hand and left-hand), casing rings (right-hand and left-hand), shaft sleeves, inter-stage sleeves, and various bearing components. The impellers are responsible for imparting energy to the fluid, while the casing rings and inter-stage bushings help maintain proper clearances and guide the fluid efficiently through each stage. The shaft sleeves protect the shaft from wear in the packing or mechanical seal areas, and the bearing assemblies support the rotating element, ensuring concentricity and minimizing friction.
The packing glands and lantern rings are crucial for sealing the shaft where it exits the casing, preventing leakage and maintaining internal pressure. For water-cooled bearings, seal piping is integrated to provide a continuous flow of coolant, ensuring that bearing temperatures remain within acceptable limits, typically 1 US GPM at 50 Psig maximum and 90° F maximum coolant temperature, with water as the normal coolant medium.
The Peerless centrifugal pumps are designed for straightforward installation and operation, though adherence to specific guidelines is critical for optimal performance and longevity. Before installation, it is imperative to read the entire instruction manual to avoid issues that could void the manufacturer's responsibility. Proper alignment of the pump and driver, as well as correct plumbing connections, are essential to prevent vibration, premature wear, and operational inefficiencies.
The multi-stage design allows these pumps to handle a wide range of flow rates and pressures, making them versatile for various industrial, commercial, and municipal applications. The ability to select between grease and oil lubrication provides flexibility to match the pump to specific site conditions and maintenance capabilities.
During operation, it is crucial to monitor the pump's performance parameters, such as pressure, flow rate, and liquid temperature, ensuring they remain within the originally purchased specifications. Operating the pump outside these parameters, or with liquids other than those for which it was designed without manufacturer consent, can lead to pump failure, personal injury, or death. The vane position for proper rotation, as illustrated in Figure 7, is a critical aspect of correct setup, ensuring the pump operates as intended.
The assembly relationship of the inter-stage sleeve, as shown in Figure 8, highlights the precision required during reassembly to ensure proper fluid dynamics and prevent internal recirculation or cavitation. The design allows for the careful positioning of impellers and sleeves to achieve optimal performance.
Maintenance is a critical aspect of ensuring the long-term reliability of these pumps. The manual provides detailed instructions for disassembly, inspection, and repair, emphasizing the importance of regular checks and timely replacement of worn components.
Disassembly: The process begins with shutting down the pump and disconnecting power to the driver, followed by disengaging coupling halves and disconnecting plumbing from water-cooled bearings. Step-by-step instructions guide the user through removing glands, casing nuts, bearing caps, and separating casing halves. Special attention is given to the careful removal of the rotating element, including impellers, shaft sleeves, and bearings, to prevent damage. Tools like arbor presses and tubing are recommended for bearing removal and mounting to ensure proper fit and prevent damage.
Cleaning: Thorough cleaning of all metal parts (except bearings) with a solvent and a non-metallic brush is essential to remove deposits. Bearings require a specific cleaning procedure involving immersion in Stoddard solvent, agitation, and flushing with a spray gun, followed by immediate lubrication and storage in a covered container to prevent contamination.
Inspection and Repair: A comprehensive inspection protocol is outlined, focusing on visual checks for cracks, nicks, tears, and excessive wear on O-rings, gaskets, packing rings, and bearing components. The shaft's eccentricity must be checked with a dial indicator, and threads must be clean and sharp. Critical clearances, such as impeller/case wear ring diametrical clearances (Figure 5) and inter-stage sleeve/bushing diametrical clearances (Figure 6), must be measured and compared against specified limits. Repair procedures include boring casing rings, installing new impeller rings, replacing worn shaft sleeves, and straightening or replacing shafts with excessive run-out.
Reassembly: Reassembly instructions are equally detailed, covering the careful coating of the shaft with oil, installation of keys, impellers, shaft sleeves, stuffing box bushings, lantern rings, and bearing components. Proper seating of casing rings and bearing housings, along with the correct tightening of all fasteners, is crucial. The manual stresses the importance of checking the run-out of inter-stage sleeves and ensuring that impellers are correctly centered.
Lubrication: For oil-lubricated pumps, the manual specifies the use of high-quality turbine oil with rust and oxidation inhibitors. It provides guidelines for initial oil changes, subsequent frequencies based on service conditions, and the importance of keeping breather tubes and filters clean. For grease-lubricated pumps, a greasing frequency table (Table III) and grease amount table (Table IV) are provided, emphasizing the need for proper lubrication to prevent bearing failure.
Troubleshooting: A comprehensive troubleshooting guide (Table V) lists common problems, probable causes, and recommended remedies. This includes issues like failure to deliver liquid, pump not priming, overload on the driver, and pump vibrations or noise. The guide helps users diagnose problems ranging from air leaks and restricted impeller passages to worn bearings and misalignment.
Spare Parts: To minimize downtime, stocking recommended spare parts, such as inboard and outboard bearings, shaft sleeves, packing sets, and case wear rings, is advised. When ordering spare parts, providing the pump size, type, serial number, and part names/numbers from the sectional drawings ensures quick and accurate service.
The Peerless Pump manual serves as a vital resource for maintaining the operational integrity and extending the service life of these centrifugal pumps, ensuring they continue to provide satisfactory and dependable service.
General| Brand | PEERLESS |
|---|---|
| Model | 4TU11A2 |
| Category | Water Pump |
| Language | English |
