Cooling water pumps

A pump impeller and a shaft bushing from a small cooling water pump assembly were generally corroded. Reddish surface discoloration revealed layer-type dezincification (Figs. 13.14 and 13.15). 

Backup systems which depend upon the action of automatic cut-in devices (e.g., a turbine-driven standby spare for a motor-driven cooling water pump, with PLCI control) would not be considered an acceptable means of preventing a utility failure for normal pressure relief design purposes, even though their installation is fully justified by improved continuity and reliability of plant operations. 

Figure 7.4 Microcomputer programming of a hatch cooling crystallizer. A, crystallization vessel, B, control heater, C, control cooler. surrounding the draft-tube), D, contact thermometer, E, discharge plug and conical baffle), F, recorder, G, relay, H, temperature programmer, I, cooling water pump, J, cooling water reservoir, K, water inflow L, water outflow after Jones and Mullin, 1974)...

Ten years later, there was a pressure surge on the cooling water lines when the cooling water pumps were ehanged over this caused a sample... 

In another incident, a maintenance foreman was asked to look at a faulty cooling water pump. He decided that, to prevent damage to the machine, it was essential to reduce its speed immediately. He did so, but did not tell any of the operating team immediately. The cooling water rate fell, the process was upset and a leak developed in a cooler. 

Nixon, R. A. and Cairney, W. D., Scale effects in centrifugal cooling water pumps for thermal power stations, NEL Report 505(1972). 

Power will be purchased from a nearby company. (One of the major reasons for locating here was the presence of low-cost, plentiful power.) A gas-fired plant for 125 psig steam will be built. This must be able to supply enough power to operate agitators and cooling-water pumps associated with the reactors when there is a power failure. Gas will be purchased from a local company. Drinking water will be purchased from the community of Martins Ferry, Ohio. Process and cooling water will be obtained from the Ohio River. Both will require treatment before they can be used in the plant. 

All mechanical and electrical components should be examined and verified that they are functioning properly. These components include the solenoid valves for water cooling systems, cooling water pumps, cooling fans, electrical heaters, thermocouples and other temperature sensors, pressure sensors, and gear pump operations. 

Kuehlwasserpumpenbauarten Fuer Kuehltuerme (Cooling Water Pump Systems for Cooling Towers)... 

Similarly, any fouling will reduce efficiency, and 5 mil (5 thousandths of an inch) of a scale or deposit may well reduce efficiency by 20 to 30%. A small amount of scale can greatly increase refrigeration compressor horsepower or cooling water pumping requirements. 

The daily power requirements, kWh/day, for cooling water pumps and fans is estimated by multiplying the circulation rate in gpm by 0.6. This power requirement is usually a significant item in total plant power load and should not be ignored. 

Table 8.31 provides the added cost for a gas engine driver. These supplemental equipment items are the starter (electric motor or air piston), air tanks, air filters, cooling water pumps, and local piping. An air-cooled radiator is included in Fig. 8.10, the engine cost curve. The radiator of course requires water circulation pumps. For 500 BHP or less, the assumption is made that cooling water of the recirculated inhibited type is available from outside circulated cooling water plant... 

If heat can be removed as fast as it is generated by the reaction, the reaction can be kept under control. Under steady state operating conditions, the heat transfer rate will equal the generation rate (see Figure 6-26). If the heat removal rate Qr is less than the heat generation rate Qg (e.g., a condition that may occur because of a cooling water pump failure), a temperature rise in the reactor is experienced. The net rate of heating of the reactor content is the difference between... 

Figure 10-2 A vibration technician taking readings on a cooling water pump.

Hot water thermostat, tank of cooling water, pumps for water pumping, gas and hydraulic main pipes and control instrumentation are parts of installation beside sorbers. Units of installation operation have cyclic character. In the first half-cycle, hydrogen is absorbed by metal hydride of a low-temperature sorber. Released heat is removed by flowing water with temperature 10-15°C. Hydrogen in a low-temperature sorber comes from a high-temperature sorber, where it is desorbed due to heating by hot water. 

Loss of cooling due to failure of cooling water pumps or air coolers ... 

AMMONIA COMPRESSORS VACUUM PUMPS(FOR PRIMING SIPHONS) COOLING WATER PUMPS DRAINAGE PUMPS BRINE CIRCULATING PUMPS BRINE STIRRING PUMPS AIR HEATERS (DEFROSTING)... 

Many utiUty-generation systems have a spectrum of impacts. For example, recirculated cooling water from cooling towers involves power consumption in air fans and cooling water pumps, raw water consumption as make-up, and a purge to avoid excessive concentration of contaminants. Refrigeration systems involve... 

A, which corresponds to maximum load), and the constant and negligible consumption of 110 W is due to the cooling water pump. 

The HP steam is principally used to drive the two syngas compressors and the MTG circulating compressor. MP superheated steam is obtained by extraction from the syngas turbines and, if necessary, by direct letdown from HP steam. MP steam is used to drive a number of turbines (eg three 2.3 MW cooling water pumps) and also in reformer feed. LP steam discharged from the back-pressure turbines is returned to the methanol units for use in the BFW deaerator and as interstage motive steam for the converter circulator turbines. 

A first example is shown on Fig. 12 for a treatment plant of a refinery (different from the one in Fig. 10), including a separator of hydrocarbons (API tank) and a sand filtration unit before a trickling filter. The raw wastewater composition is characterised by the presence of phenolic compounds with an absorption peak around 265 nm. The effect of the two pretreatment steps is evident on the particulate fraction (including the effect of emulsified hydrocarbons), but does not affect the dissolved matrix. This last is removed (at least the phenolic compounds) with the biological step, the effect of which is a removal of almost 90% of the TOC. At the end of the treatment, cooling water (pumped from the sea) is mixed with treated wastewater, explaining the nitrate dilution and the presence of chloride in the discharge. 

Energy requirements are calculated for the primary and secondary compressors and estimated for the feed, recycle, and cooling water pumps for a plant producing 1,000,000 gallons of fresh water per day. The areas of the feed-product exchangers and secondary refrigerant condensers are also calculated. 

Pumps All pumps All motors Recycle pumps Cooling water pumps Feed pumps... 

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