Pump suction strainer

The pressurized lubrication system is a more elaborate lubrication method (.see Figure 3-19). The system has a main oil pump, either crankshaft or separately driven, a pump suction strainer, a cooler when needed, a... 

Pump suction pressure gauge downstream of the pump suction strainer. 

Clean out the pump suction strainer. Check that the suction pressure gauge is operable and that the connection is not plugged. The unit engineer should have placed a red mark on this gauge showing the minimum required suction pressure to prevent cavitation on start-up. 

To lessen the risk of pumping sludges or slurries into a unit, the practice is to leave a safety margin of 50 cm (heel) below the outlet nozzle or install a strainer on the pump suction line. The deposits accumulate with time and the tanks are periodically emptied and cleaned. 

A strainer should be used in the pump suction line temporarily for a centrifugal pump and permanently for the rotary positive displacement pump. For the permanent installations, a Y-type strainer with an austenitic stainless strainer basket should be used. The cross-sectional... 

Suction lines are often partly filled by settled sand and by debris from the pits, causing the pump to hammer at abnormally low speeds. Frequent inspection and cleaning of the suction manifold is required. The suction strainer can also be a liability if it is not cleaned frequently. 

Oil is supplied to these systems by a pump normally driven from the turbine rotor, with an auxiliary pump for use when starting the turbine. The main lubricating oil pump draws oil through a suction strainer and discharges to the emergency valve and hence through a cooler and filter to the lubrication system. A separate auxiliary... 

Strainers are used primarily to catch only very large particles and will be found in applications where this type of protection is required. Most hydraulic systems have a strainer in the reservoir at the inlet to the suction line of the pump. A strainer is used in lieu of a filter to reduce its chance of being clogged and starving the pump. However, since this strainer is located in the reservoir, its... 

It adds to the friction and reduces the possible suction lift. Figure 29 shows a clack valve and strainer. Figure 30 shows one fitted with a number of valves. If the water carries impurities thau. damage to the pump a strainer should be provide, suction pipe. 

Leak in oil pump suction piping. Clogged oil strainers or filters. 

POSSIBLE CAUSES Low fluid level Suction strainer blocked Oil overheated Air entrained in fluid Leakage past direction control valve Leakage past screenchanger cylinder Pump damaged/worn REMEDY A Fill reservoir A Clean or replace A See below A Allow bubbles to subside, use antifoam A Repair or replace A Repair or replace A Replace pump... 

Cleanliness of the hydraulic fluid is critical to the satisfactory operation of the hydraulic press. Therefore, it is recommended that the pumping unit include a filtration system. Usually, there will be one or more filters of 3-10 pm, a magnetic trap, and perhaps suction strainers. 

Cyclic release from relief system. Incipient breakdown of pump or development of leak. Cavitation. Foreign material in the pump. Same as above. Options Remove material from feed if pump cannot discharge it. Install suction strainer. Check suction fine and source to determine whether additional debris exists and whether it can be removed from the system. 

At some plants openings were cut into the ECCS strainers in the suppression pool and in the sump to prevent their clogging. Debris of any kind is then filtered from the water flow by suction strainers installed before the ECCS pumps outside the containment. 

The water in the pump suction well is chlorinated to control biofouling by the injection of sodium hypochlorite from a 10,000 gallon tank. Four vertical diffusers in each pump suction well distribute the sodium hypochlorite. RSIP item B151 (Reference 74) includes provision for adding strainer pressure instrumentation in the cooling water booster pump building, strainer bypass lines, and other improvements that will allow better operator monitoring, controls, and shutdown of pumps if the pressure limits are exceeded. 

A suction bell on the inlet of a vertical pump (or the inlet pipe of the suction side of a horizontal pump) is not necessary as far as pump or sump operation is concerned. If a bell is omitted, the entrance losses due to flow will be higher ith only a straight pipe, and this must be considered in pump operation. An economic comparison vsill help decide the value of the bell. Strainers should not be placed on suction bells unless this is the only arrangement. Inlet water should be screened with trash racks, bars and screens to keep the sump free of debris. 

Option 4 Additional connections are required for 1. Shaft-driven oil pump relief valve return (not required with integral relief valve) 2. Motor-driven oil pump relief valve return (not required with integral relief valve) 3. System PCV return 4. Aux. oil pump to have independent suction w/ strainer... 

Pumps should be provided with strainers at their suction inlet, normally with 3/8-inch screen openings to avoid leaves, pieces of wood and other foreign material from getting into the pump impeller. 

The suction line from solution feed pump can now be inserted into the pipe leading to the inner cone or manifold as the case may be. The foot valve and strainer on the suction line should be 2-3 in. above the bottom of the saturator tank. Make sure the feed pump has an anti-siphon valve, which will prevent overdosing. The saturator can now be placed into service. 

Deep-well pumps of the bucket type are designed for use on non-flowing wells where the water does not stand within suction distance. Two methods are employed In the plain tube well (Fig. 6) the well pipe with open ends is sunk to the proper depth where a sufficient water-bearing stratum is penetrated. The strainer A is then lowered to bottom of the well and the well pipe drawn back far enough to expose the slotted portion. The working barrel B is then lowered into the gum packer on top of strainer and tapped firmly into place. The top of the well pipe is provided with a tee for discharge connection. The... 

OTHER LOSSES (SUCTION - e.g. STRAINER/FILTER), psi PRESSURE DROP ACROSS PUMP, pSi. 

However, some simple spare parts may be developed in-house, e.g. anti-vibration pads, level indicators, shaft sleeves for pumps, thermowells for instmments, and strainer in pipelines at suction of pumps or instrument probes. 

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