Lube oil coolers

Space needs to be provided for the auxiliaries, including the lube oil and seal systems, lube oil cooler, intercoolers, and pulsation dampeners. A control panel or console is usually provided as part of the local console. This panel contains instmments that provide the necessary information for start-up and shutdown, and should also include warning and trouble lights. Access must be provided for motor repair and ultimate replacement needs to be considered. If a steam turbine is used, a surface condenser is probably required with a vacuum system to increase the efficiency. AH these additional systems need to be considered in the layout and spacing. In addition, room for pulsation dampeners required between stages has to be included. Aftercoolers may also be required with knockout dmms. Reference 8 describes the requirements of compressor layouts and provides many useful piping hints. 

COMPRESSOR 1. Inadequate flow through the exceed 180°F. 4. Fouled lube oil cooler. 

Defective grouting. 2. Leak in lube oil cooler tubes or tube-sheet. 

Figure 9 Lube Oil Cooler Temperature Control System and...

Figure 9 shows a typical application of a block diagram to identify the operation of a temperature control system for lubricating oil. (A) in Figure 9 shows a schematic diagram of the lube oil cooler and its associated temperature control system. 

The lube oil cooler consists of a hollow shell with several tubes running through it. Cooling water flows inside the shell of the cooler and around the outside of the tubes. Lube oil flows inside the tubes. The water and lube oil never make physical contact. 

B) in Figure 9 represents the lube oil temperature control loop in block diagram form. The lube oil cooler is the plant in this example, and its controlled output is the lube oil temperature. The temperature transmitter is the feedback element. It senses the controlled output and lube oil temperature and produces the feedback signal. 

Resistance is that part of the process that opposes the transfer of energy between capacities. In Figure 9, the walls of the lube oil cooler oppose the transfer of heat from the lube oil inside the tubes to the cooling water outside the tubes. 

Inadequate cooling water flow lube oil cooler. 

Some large motors have their lubricating oil cooled by cooling tower water. If the bearings on these motors go out frequently, check the lube oil for water. The small lube-oil coolers may be leaking due to corrosive cooling tower water. On one unit this problem was solved by retubing the coolers with 316 stainless steel. 

Main feed water pump lube oil coolers. 

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