QVFB036e-0

Installation and operating instructions

Bellows in glass equipmentNo.

QVFB036e

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QVF ENGINEERING GMBHPostfach 3369 Tel.: +49 6131 9704-055023 Mainz Fax: +49 6131 9704-500Hattenbergstrae 36 E-Mail: [email protected] Mainz Internet: www.qvf.com



QVFB036eIndex:Issue: 09/2007Author: Del/Fun

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Important! Before unpacking and installing read operatinginstruction without fail

Contents

1 General..............................................................................................................................................................32 Compensation of Length Deviations due to Heat Expansions..........................................................................3

2.0 Fixed Bearing Point WPR ..........................................................................................................................42.1 Fixed Bearing Point SCHOTT....................................................................................................................5

3 Prevention of Vibration Transfer........................................................................................................................64 Assembly Support and Tolerance Compensation.............................................................................................65 Case Examples .................................................................................................................................................7

Case Example 1....................................................................................................................................................75.2 Case Example 2.........................................................................................................................................8Case Example 3....................................................................................................................................................95.4 Case Example 4.......................................................................................................................................105.5 Case Example 5.......................................................................................................................................115.6 Case Example 6.......................................................................................................................................125.7 Case Example 7.......................................................................................................................................13

6 Final Note ........................................................................................................................................................147 Technical Data ................................................................................................................................................15

7.1 Technical Data Bellows WPR, Type FB...................................................................................................157.2 Technical Data Bellows SCHOTT, Type FALD.../U/F..............................................................................167.3 Technical Data Bellows SCHOTT, Type FALD.../V .................................................................................17




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1 General

Bellows for glass equipment mostly serve the purpose to absorb length deviations due to heatexpansions so that no unpermissibly high loading tensions are created within the pipe linesand equipment. Bellows may also be deployed to compensate for pipeline offsets andvibrations.

In order to fullfil the above mentioned task, the correct setting of the fixingscrew and its correct positioning position to the pipeline, as well as thecorrect placement of the fixed bearing points are of decisive significance.

By employing different examples, this guide shall display how the assembly and setting mustbe performed for different operational conditions. Of course, not all assembly and and operational possibilities can be described here, thereforeplease consult with the engineering design department in difficult and unclear situations. 2 Compensation of Length Deviations due to Heat Expansions

In order to compensate for length deviations due to heat expansions, the part acting due toexpansion must be set as fixed bearing point versus the opposite flange connection.For this type of installation, which functions in both vacuum and also in over-pressure cases,the stopping screws must either be completely removed, or at least be unscrewed on bothsides so that the incurring expansions do not relay force and torque loads into the subsequentglass pipeline. ( see case example 1, item 5.1 )

The design of the fixed bearing points shall be performed in a fashion so that these incurringforce loads, due to over- and under-pressure, may be absorbed without significant offset. Inthe course, support forks are deployed in connection with rack pipes and Kee clamps forsmall nominal sizes, whereas pipe frames are deployed for nominal sizes greater than DN300. ( see the following illustrations for items 2.1 and 2.2)




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2.1 Fixed Bearing Point WPR




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2.2 Fixed Bearing Point SCHOTT




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A further possibility for compensation of length deviations due to heat expansions in the caseof simultaneous over- and underpressure, is to assemble two bellows, which operate similarto a pendular support.In this assembly case, both nuts of the stopping screws shall be set to a tolerance gap of 0.1 0.2 mm so that angular movements are possible.By performing this setting, no force loads may be relayed due to over- and under-pressureinto the glass pipeline, and no loading tensions are exerted within the glass pipeline.

For all installations, in which stopping screws are deployed, one shall alwaysnotice that the stopping screw plane always settles to be perpendicular tothe pipeline plane.If this rule is not complied with, significant loading tensions are createdwithin the glass pipeline, which frequently leads to glass breakage.( see case example 4, item 5.4, and case example 6, item 5.6 )

3 Prevention of Vibration Transfer

Bellows are deployed in order to prevent the relay of vibrations to subsequent pipelines.Their assembly is performed via an externally positioned stopping screw during the assemblystatus. Upon the first start-up heating of equipment, the settings of the bellows shall beinspected, and possibly be corrected; this is performed in a cold and pressure-free state.For stirrers, the bellow serves the purpose of detachment, meaning for the prevention of relayof drive weight load onto the stirrer end.Additionally, the transfer of vibrations onto other equipment parts is prevented.

The stopping screws shall be removed for the above mentioned deployment!

4 Assembly Support and Tolerance Compensation

As all glass pipelines display fairly large tolerances, bellows and joint seals are deployedduring assembly for the purpose of length and angular compensation. Of course, the jointseal can only compensate for angular offsets and not for length deviations.This applies for pipelines ranging up to nominal widths of DN 150. In this application case, theguidelines described in items 2 and 3 shall unconditionally be considered.

It is of utmost importance that the planes of the stopping screws arepositioned perpendicular to the pipeline plane.




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5 Case Examples5.1 Case Example 1




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5.2 Case Example 2




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5.3 Case Example 3




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5.4 Case Example 4




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5.5 Case Example 5




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5.6 Case Example 6




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5.7 Case Example 7




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6 Final Note

In order to minimize insecurities during the assembly of the bellows, all technical drawingsshall be indicated with the positioning of the bellows and of the stopping screws via a symbol. As sometimes inclarities remain to exist in spite of all of the notes contained within thedrawings and assembly guidelines, one shall please consult with the engineering designdepartment in such cases.

For very complex equipment, acceptance shall be performed by a worksexpert on-site.

In order to again point out to the importance of correct assembly and setting of the bellows,the magnitude of force loads, which result from exerting vacuum and pressure, shall bestressed.

Nominal width DNmm

Tensile/PressureVakuum

N

Tensile/PressureOverpressure

N

Operatingpressure

bar25 110 450 480 750 2260 3

150 2510 5030 2300 8910 8910 1




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7 Technical Data 7.1 Technical Data Bellows WPR, Type FB...




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7.2 Technical Data Bellows SCHOTT, Type FALD.../U/F




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7.3 Technical Data Bellows SCHOTT, Type FALD.../V

GeneralCompensation of Length Deviations due to Heat ExpansionsFixed Bearing Point WPRFixed Bearing Point SCHOTT

Prevention of Vibration TransferAssembly Support and Tolerance CompensationCase ExamplesCase Example 1Case Example 2Case Example 3Case Example 4Case Example 5Case Example 6Case Example 7

Final NoteTechnical DataTechnical Data Bellows WPR, Type FB...Technical Data Bellows SCHOTT, Type FALD.../U/FTechnical Data Bellows SCHOTT, Type FALD.../V

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