Temporary strainers

Temporary strainers and blinds installed Provisions for sampling... 

Alternatively (or in addition), temporary strainers can be installed in outlet lines, especially those feeding pumps. Strainers alone are less effective than plugs, because some debris can pass through strainers or damage strainer elements by impact and then... 

Checks — before pressure testing, a functional inspection of each system is can ied out to ensure that it has been installed coireclly — for example, correct valve types, control valves the right way round, correct instruments fitted and so on. All vulnerable equipment such as pumps and control valves are fitted with temporary strainers. The system is then blanked off at each end, filled with water and pumped up to test pressure. The line/vessel test pressures must be compatible. Relief valve set pressures are tested on-site and tagged before installation. If necessary, relief valves are blanked during pressure testing of lines. 

After completion of linc/equipment pressure testing, remove all swing blinds (slip-plates) from lines other than those required for operation purposes and install temporary strainers H H H... 

Installation of oriRce plates after line cleaning, installation of temporary strainers, removal of slip-plates and so on. 

Open up system flush or blow through to remove mill scale/rubbish. fit temporary strainers and close ... 

Strainers offer a simple method for the protection of pipeline systems, by removing debris such as dirt, swarf, weld sputter, scale and so on. They are simple coarse filters using perforated plate or wire mesh as the filter medium. Strainers fall broadly into two categories temporary strainers and permanent strainers. 

Where fitting such strainers is difficult or impractical on a particular system, other types of temporary strainers are available to match a blind T-junction fitting, into which they can readily be fitted and removed. These strainers are often of a trough shape, and have become referred to as bathtub strainers. 

Rusty pipe should not be used. The rust and loosened mill scale will travel around the circuit to block the suction strainer and the drier. Other avoidable debris are loose pieces of weld, flux, and the short stubs of welding rod often used as temporary spacers for butt welds. Pipe should only be cut with a gas torch if all the oxidized metal can be cleaned out again before closing the pipe. 

Duplex basket strainer —H )— T type strainer permanent) —— T type strainer temporary) X" —- Vent... 

At this stage, sensitive instruments and control valves may be absent from the system, in order to prevent damage from any debris flushed through pipework, and replaced by temporary spool pieces. Strainers should be fitted to the suction lines of pumps and certain compressors. Orifice plates should be omitted. 

Proper direction of rotation of all drives Inclusion of temporary startup strainers Free movement of pipe guides... 

Have the temporary start-up strainers been identified to ensure removal for normal operation ... 

Administrative control systems shall be established for installation of temporary modifications such as electrical jumpers, lifted leads, pulled circuit boards, disabled annunciators/alarms, mechanical Jumpers, bypasses, temporary set point changes, installed or removed blank flanges, disabled relief or safety valves and installed or removed filters or strainers, plugged floor drains, and temporary pipe supports. 

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