gl ludemann t- · pdf filegl ludemann t-strainers ... do not lift the strainer by the lifting...

GL LudemannT-Strainers

Installation, Operation and Maintenance Manual

GL Ludemann Armaturen GmbH GL Ludemann Appendages GL Ludemann Robinetterie0049 221 933534-0 0031 598 690550 0049 221 [email protected] [email protected] [email protected] www.ludemann.info

English

GL LudemannGL LudemannGL LudemannT-StrainersT-StrainersT-StrainersT-Strainers

Installation,Installation,Installation,Installation,Installation,Operation andOperation andOperation andOperation andMaintenanceMaintenanceMaintenanceManualManualManual

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GENERALThese instructions are for installation, operation and maintenance of T-strainers fabricated by GL Ludemann Arma-turen GmbH in Germany.

These instructions are for skilled employees that are familiar with the common process equipment terminology.

GL Ludemann Armaturen GmbH declares that it reserves its right to modify these instructions; the information, specifications and technical data contained in this document are subject to change without notice. You can check if you have the latest update of this document by contacting GL Ludemann GmbH.

Attempts to modify and/or repair this strainer by unauthorized or unqualified persons void the product warranty and may cause damage to property and serious injury or death to persons.

These instructions have to be fully read and understood prior to installing or using the T-strainer. Failure to comply with these instructions may cause damage to property and serious injury or death to persons.

Always wear appropriate protective equip-ment (helmet, gloves, safety goggles etc.) when installing or maintening the strainer.

CONSTRUCTION1) Lifting eye for cover2) Vent plug3) Cover4) Gasket5) Screen (basket)6) Drain vent

Figure 1 Construction (standard issue without accessories)

GL Ludemann T-Strainer Manual


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CONSTRUCTIONThe fabricated T-strainers made by GL Ludemann Armaturen GmbH are devices used in pipelines to remove dirt and other debris from fluids.

The T-strainers can either be fitted with a round basket (as pictured in figure 1) or with a half round element. When a half round element is installed it is possible to clean the strainer by flushing the body through the bottom drain, with a basket installed this is not possible and the cover has to be lifted to clean the strainer.

The element are made from stainless steel plate with round openings for filtration. The standard perforated plate element can also be lined with wire mesh for fine filtration. The strainer has a large sump area at the bottom of the basket for particulate accumulation.

A vent located in the cover and a drain located at the bottom of the strainer body allows fast filling and draining.

All T-strainers made by GL Ludemann Armaturen GmbH are fabricated to meet the exact needs of the customer and are thus build to customs specifications. Used materials, flange sizes and pressure rates can be various and depends upon the specifications provided by the customer. Also several accessories can be mounted such as a davit arm, sup-port legs, quick opening cover, connections for pressure gauges to measure pressure drop etc.

All strainers are shipped fully assembled, ready for installation and were pressure tested before leaving the factory.

Figure 2 Example nameplate

RECEIVING HANDLING INSPECTION AND STORAGEWhen receiving the strainer inspect it for damage occurring during transit. When any damage is found report to the carrier immediately.

Verify that the flange size (and rating) of the strainer is the same as ordered and that it fits to the other piping in the system. This flange size (and rating) can be found on both the in- and outlet flanges, on the nameplate and on the accompanying documents.

Verify that the pressure rating of the strainer is greater than or equal to the maximum pressure of the installation. This information can be found on the nameplate and/or on the accompanying documents.



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Verify that the temperature rating of the strainer is greater than or equal to the maximum temperature of the installation. This information can be found on the name plate and/or on the accompanying docu-ments.

RECEIVING HANDLING INSPECTION AND STORAGEWhen the strainer is not installed immediately after delivery the strainer must be stored indoors in a clean and dry environment.

When hoisting the strainer always use certified and proper sized hoisting slings without any defects. Lift it with slings under the in- and outlet connections.

DO NOT lift the strainer by the lifting eye on the strainer cover because that is for lifting the cover only. See drawing below (figure 3).

Figure 3 Figure 3 Figure 3

Hoisting instructionsHoisting instructions

INSTALLINGT-strainers are designed to be used in horizontal lines.

Make sure that sufficient clearance is provided for easy opening of the cover and for screen removal.

Before installing the strainer in a system make sure the system is fully depressurized and all process fluid is drained from the system. Also assure that no process fluids can enter the system when installation is in progress.

Check the interior and exterior of the strainer to assure the strainer has no defects caused by transport or storage. Check the interior of the strainer for any foreign objects (tools, waste etc.).

Clean the flange facings of the strainer thoroughly and always use new gaskets that are dimensionally correct for the specific flanges. Use full face gaskets to assure the whole flange facing is covered by the gasket. Make sure the gaskets that are used are suitable for the process fluid in the system. Also assure that the counter flanges of the exist-ing piping are clean. Flanges can be cleaned with solvent dampened cloths.

Extra care has to be taken when using solvent, follow instructions of the solvent manufacturer.



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INSTALLINGPosition the strainer in the pipeline with the flow following the same direction as the red flow direction arrow on the strainer. This arrow can be found on one of the flanges or on the nameplate bracket.

Quality of bolts and nuts (or stud bolts) used for installing the strainer should be of a proper grade (for DIN use 8.8 or higher, for ASTM use B7/2H or higher). Always use proper sized bolts and nuts. The bolts must have sufficient length.

The pipeline where the strainer is installed must be conducted and assembled in such a way that the strainer body is not subjected to bending moment, stretching forces or system vibrations. When necessary pipe supports should be fitted under the process piping near the in- and outlet of the strainer. The strainer can also be fitted with support legs (accessory). Also make sure no stretching forces are generated, for example a different face-to-face length of the strainer.

When nozzles on the strainer have to be connected with external piping use care to prevent bending or expansion forces from acting on the nozzles.

START-UPBefore starting-up the system make sure that the pressure of the system can not exceed the maximum allowable pressure of the strainer. Maximum allowable pressure can be found on the nameplate.

Before starting-up the system make sure that the temperature of the system can not exceed the maximum allowable temperature of the strainer. Maximum allowable temperature of the strainer can be found on the nameplate.

Precaution should be taken when operation temperature can exceed 40° because above that tempera-ture limbs or other body parts can be burned when touching the strainer. In case temperature could exceed 40° use proper covering or isolation.

If, for the start-up, the strainer has to be filled with liquid make sure that the bottom drain is closed and the air vent in cover is open. Make sure the strainer is completely filled with liquid without any air remaining.

Avoid liquid spraying out of the air vent when filling the strainer; fill the body gradually. Also take extra care when working with hot or dangerous liquids.

Start-up the system GRADUALLY (pressure and when applicable also temperature) to eliminate sudden shock to the strainer and the piping system.

When the system is pressurized the cover, joints, gaskets and connections must be checked for any leakage. Gasket replacement or tightening of flange bolts or cover bolts is necessary if leakage occurs.



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OPERATION AND MAINTENANCEAll operating conditions and specifications as stated before must be maintained and monitored during operation.

Check the inside of the body for corrosion when performing periodical maintenance to the strainer.

When any leakage to gaskets or connections of the strainer occurs immediate action is needed to avoid a hazardous situation for its environment. Gaskets that keep leaking after retightening the bolts must be changed.

The interval between inspection and maintenance will depend on service conditions. The pressure drop should be periodically checked and recorded to determine when the screen needs cleaning. To measure the pressure drop across the element two pressure gauges must be installed near the in- and outlet of the strainer. Such connections for pressure gauges can also be fitted on the strainer (accessory).

When a basket is installed flushing dirt and debris through the bottom drain will NOT be possible and the cover has to be lifted to clean the element. See the instructions below for screen removal.

When a half round element is installed small amounts of contamination can be cleaned by flushing the bottom drain. When flushing the bottom drain is not sufficient enough, the screen has to be cleaned more thoroughly by lifting the cover. See the instructions below for screen removal.

When flushing the bottom drain or when lifting the cover extra care has to be taken to avoid hazardous situations caused by any process fluid leaking from the strainer.

FLUSH CLEANING THROUGH BOTTOM DRAIN Flush cleaning the strainer can be done by slowly unscrewing the bottom drain (number 6 in figure 1). For the bottom drain a proper drain valve with drain pipe can be installed. When draining or venting, the fluid must be piped to a safe discharge point to protect the operator.

CLEANING THE SCREEN BY REMOVING THE COVER

ALWAYS ENSURE NO LINE PRESSURE EXISTS WHEN OPENING THE COVER!

Before lifting the cover make sure the system is fully depressurized and all process fluid is drained from the strainer.Drain the process fluid by slowly unscrewing the bottom drain (item 6, figure 1) on the strainer body. When the drain plug is completely removed open the vent plug (item 2, figure 1) in the cover to drain the strainer more rapidly and to assure the strainer is completely drained.

Assure that no process fluids can enter the system when maintenance is in progress!



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CLEANING THE SCREEN BY REMOVING THE COVEROpen the bolts of the cover flange (item 3, figure 1) gradually. Please take care to loosen and to screw out the nuts in a crosswise manner in order to prevent the cover from tilting. After opening all the bolts unscrew all bolts com-pletely and remove the cover.

Removing the cover can be done either by lifting it to the hoisting eye or with a davit arm when mounted (accessory). Smaller covers can be removed by hand. Take care not to damage any machined surfaces.

Remove the element from the strainer body. Clean all debris from it as required (e. g. steam cleaning, solvent clea-ning, wire brushing). Do not let the basket debris get dry, as it would be more difficult than, to clean the basket.

Inspect the element for damage. When any damage to the element is noticed the element has to be replaced. Infor-mation to be provided to GL Ludemann Armaturen GmbH when ordering a spare element: the information on the nameplate (or a picture of it) and the dimensions of the sieve screen (length, diameter and mesh, etc.).

Check the gasket and flange facings of the cover for any defects and clean them thoroughly.

When spiral wounded gaskets have been used always use a new one when replacing the cover. Spiral wounded gaskets can NOT be used twice!

Clean the cover bolts and make sure they are undamaged, when damaged replace them.

Place back the element, make sure that it is pressed into place and correctly placed otherwise it can be distorted when closing the cover. In case a basket is installed it is fitted with a special bolt to adjust the total height of the basket. Make sure that it has sufficient height and is (slightly) compressed when the cover is placed back.

Place back the cover with its gasket. Assure that the gasket is correctly fitted.

Hand tighten all nuts and bolts (or stud bolts) of the cover and afterwards tighten them with a tool in a back and forth clockwise motion. Please take care to loosen and to screw out the nuts in a crosswise manner in order to pre-vent the cover from tilting. Reinstall and tighten the drain plug (item 6, figure 1).

Fill the strainer GRADUALLY and make sure it is completely filled with liquid without any air remaining.

Avoid liquid spraying out of the air vent when filling the strainer. Also take extra care when working with hot or dangerous liquids.

When all air is expelled reinstall and tighten the vent plug (item 2, figure 1).

Start-up the system GRADUALLY (pressure and when applicable also temperature) to eliminate sudden shock to the strainer and the piping system.

When the system is pressurized the cover, joints, gaskets and connections must be checked for any leakage. Re- tightening of the cover flange bolts or gasket replacement is necessary if leakage occurs.



Issue 1 - 03/2014 - /7

gl ludemann t- · pdf filegl ludemann t-strainers ... do not lift the strainer by the lifting...

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