Lube oil filters

Differential pressure aeross die lube oil filter Differential pressure aeross die inlet sereen Pressure behind die expander and eompressor impellers Oil reservoir level... 

GOVERNOR LUBE OIL FILTER LJFULL FLOW ] SLIPSTREAM... 

Increase maintenance on the unit. Revise maintenance schedule Q-50, for Engines QM-350 A B, revise bimonthly change of lube oil filters to monthly. 

Lubricating Oil Filter Installation. Position the lube-oil filter as close to the engine as possible. 

Lube oil units are typieally available in two versions the manu-faeturer s standard or in aeeordanee with API Standard 614. The major eomponents of a unit are the oil tank, auxiliary oil pump, double filter and, seleetively, one or two oil eoolers. All eomponents of the smaller units are mounted on a eommon bedplate, separated from the other eomponents. The oil ean be heated by an eleetrieal or steam-powered heating unit. The neeessary instrumentation is a standard supply item and, if requested, the switehes and motors ean be prewired. The main and auxiliary oil pumps are driven by different types of drivers (e.g., one by an eleetrie motor and the other by either a small steam turbine or by direet eonneetion to the shaft end of a major maehine easing in the turbotrain). 

Lubrication is typically provided by two separate oil pumps—a direct shaft-driven pump on the gear case and an auxiliary electric motor-driven oil pump that is usually mounted on a lube skid or similar sub-base. Oil filters, oil coolers, and oil heaters complete tlie lubrication system, which has many (if not all) feamres in coimuon with traditional auxiliary systems. A typical schematic is shown in Figure 4-42. 

All piping assoeiated with turboexpander lubrieation systems should be 300-series stainless steel. Using non-stainless piping upstream of the filters does not harmonize with the life-eyele eost goals of modern industrial plants. Whenever possible, lube oil piping eonneetions should be welded. 

The lube oil pumps are now ready to be turned on. The pump and filter bypass valves should be open to avoid pressure pulses in the filter eartridges. Strong pressure pulses may eause filter eartridges to eollapse. Typieal filter elements will withstand 35-100 psi differential. If the pumps are turned on with eaeh bypass elosed, an instantaneous pressure of approximately 150 psi will hit the filters. This is due to the setting of the relief valves. For this reason, it is important to have on hand several extra seal gas and lube oil eartridges. 

After the lube oil pumps have been running for approximaely 15 min, elose the pump and filter bypass and slowly pressurize the system to establish normal lube oil pressure. The alarm and shutdown lights should turn off by pushing the reset button on the annuneiator panel. 

Solvent dewaxing Treatment Cool/filter Remove wax from Inbe stocks Vacuum tower lube oils Dewaxed lube base stock... 

The solvent dewaxing process involves addition of solvent during the chilling of the waxy feed. The chilling process induces crystallization of the wax and the solvent is added to maintain the fluidity. The wax crystals are filtered by rotating drum filters, resulting in a lube oil filtrate and a slack wax with entrained solvent and oil. In both fractions, the solvent is recovered by successive vaporization and distillation. 

The primary function of the lube oil console is to supply clean, cool lubricating oil to the bearings of the compressor and its driver. The console is a package of equipment, which is supplied by the compressor vendor and usually includes an oil reservoir, two pumps (a primary and a spare), two filters or filter elements in a duplex-type arrangement, coolers, and associated controls. A typical lube oil console is shown in Exhibit 4-20. When placing a iube oil console around a compressor, the designer must adhere to clearance requirements for operation and maintenance of the unit. First, there should be sufficient room to remove the cooler tube bundle. Second, the space required to pull the filter elements must be considered—there can be no physical obstruction over the filters that... 

Carbon contamination of the produced sulfur can result from liquid hydrocarbon droplets in the feed gas or by condensation of feed gas hydrocarbons. This problem is besr avoided by operating the process about 10°F above the feed gas hydrocarbon dew point and by removing any hydrocarbon aerosol in the feed gas (compressor lube oil, etc.) with a coalescing filter (Allen, 1995). Yet another potential form of sulfur contamination can occur when the feed gas contains a significant amount of mcrcaptans. Any disulfides formed will lend to coat the surface of the sulfur particles. If the sulfur is to be recovered as a salable product, special attention needs to be paid to the design of the overall system to avoid production of low-quality, disulfide-contaminated sulfur. Elimination of mercaptans and heavy hydrocar-... 

The largest industrial SRNF plant is installed in the petrochemical industry (Bhore et al., 1999). Wax is a monoester of fatty acids that severely modifies the properties of lube oil and must therefore be removed (Hart et al., 1995). The traditional process of dewaxing involved the cooling of a hydrocarbon mixture in solvent or solvent mixtures (methyl ethyl keton, acetone) to temperatures typically ranging from —5 to — 18°C. In this chilling section, waxy components coagulated and were precipitated or filtered the solvent in the filtrate was removed by evaporation and reused in the process (Cuperus and Ebert, 2002). 

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