INTERNAL TO JOHN CRANE - NOT TO BE RELEASED TO EXTERNAL PARTIES WITHOUT PERMISSION PAGE 1 GUIDE TO MEASUREMENT OF ROTATING EQUIPMENT Contents: 1.0 INTRODUCTION Page 3 2.0 SOURCES OF EQUIPMENT DIMENSIONS 3 3.0 WHERE TO TAKE DIMENSIONS 4 4.0 RECORDING DATA 4 5.0 MEASURING EQUIPMENT & ACCURACY 4 6.0 MEASUREMENTS & CHECKS 4 7.0 RETROFITS - REUSING EXISTING SEAL PARTS 9 8.0 UPGRADES FROM GLAND PACKING 9 9.0 DOUBLE SEALS 10 10.0 PRE-COMMISSIONING EQUIPMENT CHECKS 10 11.0 OTHER EQUIPMENT 13 12.0 STUFFING BOX & SLEEVE DATA SHEET 14 John Crane EAA
Transcript
INTERNAL TO JOHN CRANE - NOT TO BE RELEASED TO EXTERNAL PARTIES WITHOUT PERMISSION PAGE 1
GUIDE TOMEASUREMENT OF
ROTATING EQUIPMENT
Contents:
1.0 INTRODUCTION Page 3
2.0 SOURCES OF EQUIPMENT DIMENSIONS 3
3.0 WHERE TO TAKE DIMENSIONS 4
4.0 RECORDING DATA 4
5.0 MEASURING EQUIPMENT & ACCURACY 4
6.0 MEASUREMENTS & CHECKS 4
7.0 RETROFITS - REUSING EXISTING SEAL PARTS 9
8.0 UPGRADES FROM GLAND PACKING 9
9.0 DOUBLE SEALS 10
10.0 PRE-COMMISSIONING EQUIPMENT CHECKS 10
11.0 OTHER EQUIPMENT 13
12.0 STUFFING BOX & SLEEVE DATA SHEET 14
John Crane EAA
John Crane EAA
GUIDE TO MEASUREMENT OF
ROTATING EQUIPMENT INTERNAL TO JOHN CRANE - NOT TO BE RELEASED TO EXTERNAL PARTIES WITHOUT PERMISSION PAGE
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John Crane EAA
GUIDE TO MEASUREMENT OF
ROTATING EQUIPMENT INTERNAL TO JOHN CRANE - NOT TO BE RELEASED TO EXTERNAL PARTIES WITHOUT PERMISSION PAGE
Hyperlinks to points in the document:
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Nearest ObstructionSee Section 6.3.1
ShaftSee Section
6.1.1
Radial ObstructionSee Section 6.3.2
Seal Chamber BoreSee Section 6.1.2
Access WindowSee Section
6.3.3
Heating / Cooling Gallery
See Section 6.4
Spigot LocationSee Section
6.1.2
Flush ConnectionSee Section 6.6
Direction of Rotation
See Section 6.5
KEY ASPECTS OF ROTATING EQUIPMENT:
PCD / Bolt StudsSee Section 6.2
John Crane EAA
GUIDE TO MEASUREMENT OF
ROTATING EQUIPMENT INTERNAL TO JOHN CRANE - NOT TO BE RELEASED TO EXTERNAL PARTIES WITHOUT PERMISSION PAGE
1.0 INTRODUCTION
Mechanical seals are not stand-alone items, but always form part of a larger rotating equipment assembly. Obviously if the seal is to function properly it is vital that the design of the seal installation is based on the correct dimensions and information covering all aspects of the rotating equipment which affect the seal. In many cases, this information is reliably available from drawings, but in some situations, there is no alternative but to take measurements of the actual equipment in the field.By their nature, rotating equipment tends to be very diverse in design; hence, it is not possible to produce a document guide covering all such designs that may be encountered in the field. Rather this document covers normal measurements for a typical centrifugal pump, but also refers to other equipment types in passing. With some field experience, it should be possible to apply the points given in this guide to other types of equipments on a case-by-case basis.
2.0 SOURCES OF EQUIPMENT DIMENSIONS
1. EQUIPMENT OEM As the original manufacturer, the OEM must have drawings!
ADVANTAGES As original manufacturing drawings these should reflect the actual equipment dimensions (but see below)
DISADVANTAGES May not be correct, changes may have been made in Production or on site which are not reflected on the drawingOEM often unwilling to release drawings due to a) confidentiality, b) no benefit to them, c) desire to retain seal spares business etc.
2. END-USER The end-user may have access to drawings from the OEM or in some cases may even have made their own drawings
ADVANTAGES As a customer the end-user may have more influence for obtaining OEM drawings than John Crane as a supplier
DISADVANTAGES Drawings may be inaccurate or incompleteModifications may have been made to the equipment which have not been recorded
3. COMPETITOR For retrofits the end-user may have a seal drawing from a competitor showing seal chamber and / or the envelope dimensions of the existing sealing arrangement
ADVANTAGES Easier than site measurementDISADVANTAGES The competitor's drawing may contain errors (sometimes
deliberate!)There may be inadequate dimensional information shown on the competitor's drawings - again this is sometimes intentional to make seal retrofitting very difficult
4. SITE MEASUREMENT
The subject of this Guide
ADVANTAGES Access to the actual equipment in which the seal will be installed ensures that any local modifications etc. that may have been made will be apparent
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GUIDE TO MEASUREMENT OF
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DISADVANTAGES The equipment may be running and there may be no maintenance opportunity to dismantle it for measurement purposesCareful measurement, recording and communication of dimensions by the engineer are essential - errors must be avoided!The measurement process is time-consuming
While the other options should be considered first, this document focuses on option no. 4 above, i.e. measurement of rotating equipment on site. This measurement is invariably carried out by John Crane personnel, either because the site engineers are too busy to do this and regard it as a seal vendor's task, or because they are unwilling to take the responsibility of measuring it themselves in case the seal ultimately does not fit!
3.0 WHERE TO TAKE DIMENSIONS - e.g. SITE / JC WORKSHOP / OTHER
For small pumps at sites close to a John Crane workshop, removing backplates or other parts of the equipment from the site for measurement purposes may sometimes be possible. This gives the advantages of being able to measure and record details in a 'controlled' manner, with more measurement equipment available and the option of making a cup of tea. However, in practice this is generally impractical either due to time constraints, remote location, large equipment, difficulties of getting a gate pass to remove the parts from site etc.Therefore, measurements will normally be taken at the site, either at the installation itself or (better) in the site Maintenance Workshop.
4.0 RECORDING DATA
Measurements taken should be recorded in a clear and concise way. This should normally be done on the John Crane Stuffing Box & Sleeve Data Sheet as shown in Section 12.0. Any aspects of the equipment not shown on the form but which are relevant can be sketched separately.Note that one practical way of recording various features of the equipment may be to use photographs (digital or Polaroid), since these can show the overall 'style' of the equipment, the positions of any obstructions, the extent of the damage to any worn components etc. The photographs can be reviewed by other engineers / draftsmen back in the office, and can be kept as a record for future reference.
5.0 MEASURING EQUIPMENT & ACCURACY
The John Crane representative should take suitable measuring equipment when attending the site, normally including a Vernier Calliper (250mm-range min.), a Micrometer and a 12" ruler.Suitable measuring equipment and accuracies are given against each of the dimensions described below. Where accurate measurement is needed and a Vernier Calliper or Micrometer is to be used, these should be periodically calibrated (typical interval 1 year for irregular use). It is sometimes thought that only Manufacturing / QC measuring equipment needs calibration, and that this is not necessary for equipment used intermittently on site. Clearly this is a fallacy, since measuring anything with uncalibrated / inaccurate equipment defeats the whole purpose of taking an 'accurate' measurement.
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GUIDE TO MEASUREMENT OF
ROTATING EQUIPMENT INTERNAL TO JOHN CRANE - NOT TO BE RELEASED TO EXTERNAL PARTIES WITHOUT PERMISSION PAGE
Even for calibrated equipment, it should be remembered that a Vernier Calliper is subject to a measuring tolerance of + 0.02mm, a Micrometer to + 0.01mm. Attempting to measure anything to greater accuracy than + 0.5mm with a ruler is unacceptable practice.While greater accuracy could be achieved with bore gauges, these are usually unavailable on site and are not normally warranted for this type of work.
6.0 MEASUREMENTS & CHECKS
6.1 CRITICAL SURFACES FOR SEALING & LOCATIONThe following are critical surfaces for location of seal components and for secondary sealing. Accordingly special care must be taken to ensure these elements of the equipment are properly measured / checked.
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3
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1 - sh a ft d iam eter2 - b o re o f sea l ch am b er3 - face o f sea l ch am b er
6.1.1 ShaftThe shaft of the equipment sets the position of all the rotating portion of the seal assembly, either through a close clearance shaft sleeve or directly to a retainer / collar etc. It also forms part of a static or dynamic seal (e.g. sleeve o-ring / trapped gasket / secondary seal etc.).For stepped shafts, it is essential to measure all relevant diameters in the seal chamber area, both inboard and outboard of the seal. Where the design is a hooked sleeve, the position of the hooked step, the minor diameter and the keyway should all be noted.The major diameter on the shaft should have an adequate lead-in chamfer (typically 1.5mm long X 20o) to ensure that the sleeve / sleeve o-ring / secondary seal can easily be passed onto the shaft during seal installation. If this does not exist then the end-user should be asked to modify the shaft.Note should be taken of any special features existing on the shaft, for example pin or setscrew holes, threads etc., and their size and position should be recorded.
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GUIDE TO MEASUREMENT OF
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NOTE: Some shaft sleeves have a high hardness (chrome steels etc.) or a hard coating (Metco, chrome oxide spray etc.) in the area of the seal. It is important to note the position of any such coatings, and to establish the shaft hardness (normally via the OEM or possibly with a hardness tester), since this would affect the holding power of setscrews (seal head or drive collar).
Typical manufacturing tolerance: + 0.02 to + 0.05mmRequired measurement tolerance: + 0.01mmSurface finish: 0.8mRoundness: 0.05mm TIRPreferred method of measurement: Micrometer
6.1.2 Bore of seal chamber / spigot diameterGood practice for all mechanical seals demands a radial location of the stationary element, to ensure those parts are centred relative to the shaft. For the majority of seal installations the bore of the seal chamber is used as a close clearance pilot diameter, to radially locate the stationary portion of the seal assembly. The exceptions are installations where: the radial location is taken from an OD spigot, in which case similar comments apply
to that OD surface instead of the ID some cartridge seal designs are radially set through setting spacers or centralising
rings (e.g. Type 5600 series etc).For either of the seal chamber bore is then less critical, since it is not used for sealing or location.
ID Spigot OD Spigot
Where an ID spigot is used, there may be a short recess machined as a counterbore into the face of the seal chamber. In such cases this recess is intended specifically for spigotting purposes, hence should be a controlled (tight tolerance) diameter.For some seal designs, an o-ring in the bore of the seal chamber forms the static seal between the gland plate and the seal chamber. In such cases the surface finish of the seal chamber bore must be sufficient for sealing purposes (see below), and there must be an adequate lead-in chamfer to ensure the o-ring does not get cut during installation (typically 1.5mm long X 20o). Similarly, if the o-ring has to pass over any connection holes or other steps on the ID surface, these should be dressed or relieved to prevent o-ring damage during installation.
ROTATING EQUIPMENT INTERNAL TO JOHN CRANE - NOT TO BE RELEASED TO EXTERNAL PARTIES WITHOUT PERMISSION PAGE
6.1.3 Face of seal chamber The face of the seal chamber is normally used as a sealing surface for either an o-ring or gasket in the seal gland plate. Although this is a static secondary seal, nevertheless it is important that the surface finish of the seal chamber face is adequate for sealing purposes. The face of the seal chamber also acts as an abutment for the gland plate, hence must be square to the shaft to prevent any misalignment of the stationary seal assembly.
Surface finish: 0.8mSquareness to shaft: TIR 0.005mm per 10mm of seal chamber bore
6.2 BOLT STUD / PCDThe bolt PCD is a critical piece of information; any errors made in recording this could be expensive and time-consuming (or even impossible!) to rectify, and would inevitably be damaging to the John Crane reputation.The diameter across from the outside of one stud to the outside of the diametrically opposite stud should be measured using a Vernier Calliper. A measurement should then be taken from the inside of the studs. The mean of these 2 dimensions should then be taken and this considered as the PCD. With 4 studs, this should be checked with the opposing pair of studs to ensure the figure is the same!The angle of the bolt positions should be noted, e.g. TDC and 90o positions, 45oC positions, special positions / non-standard angle etc. In the latter case, it may be necessary to 'construct' the positions of the bolt studs by taking several measurements. NOTE: there is often a wide tolerance on the actual positions of bolt studs; hence, even for orthodox bolt positions it is still worth constructing the position as a check.The bolt stud extension should be measured, since this will limit the section of the seal gland plate or require replacement longer studs. This dimension should be measured from the end face of the seal chamber to the end of the threaded portion of the stud. Note that for seal retrofits the thickness of the existing gland plate can also be used as a guide to allowable envelope dimensions.
6.3 OBSTRUCTIONSMost seal selections and designs are constrained by the available space in the seal chamber. This problem is compounded in a growing number of upgrades to double seal installations in older equipments, resulting from greater emphasis on emissions/ reliability / safety etc.
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GUIDE TO MEASUREMENT OF
ROTATING EQUIPMENT INTERNAL TO JOHN CRANE - NOT TO BE RELEASED TO EXTERNAL PARTIES WITHOUT PERMISSION PAGE
Nearest AxialObstruction(bearing housing)
Nearest Radial Obstruction(bearing bracket)
Access Window
Drain Hole
typical end-view of sealchamber:
The major constraints facing the seal supplier are as follows:
6.3.1 AxialThe most important axial obstruction to consider is the distance to the bearing housing. This is variously referred to as the N.O. (Nearest Obstruction) or the F.O.B. (First OBstruction). This restricts the length of the seal assembly outboard of the seal chamber. It is normally impossible to increase this distance, because the bearing position will be fixed as part of the original design. Therefore, the only way to make more space available would be to machine back the surface of the seal chamber. However, this is unpopular with end-users due to the difficulties of making the modification, and because it is an irreversible process. Note that the distance to the nearest obstruction at the shaft may be less than at a larger diameter, due to the inclusion of a bearing deflector.
Typical build tolerance: + 0.5mmRequired measurement tolerance: + 1mmPreferred method of measurement: Vernier or ruler
6.3.2 RadialRadial obstructions typically include bearing brackets or other features limiting the design of the seal installation. These can affect the gland plate OD, the size and position of tapped connections for flushing / quenching etc. Thought must also be given to the 'ergonomics' of the seal design, for example the space available for tightening of setscrews, removal of setting spacers etc.The positions of any obstructions should be 'constructed' by taking various measurements relative to the face of the seal chamber, the shaft, the bearing housing etc. Bearing bracket designs will be vary depending on the individual equipment, however typical configurations include those shown on the Stuffing Box and Sleeve Data Sheet.
Typical manufacturing tolerance: + 0.5mmRequired measurement tolerance: + 1mmPreferred method of measurement: Vernier or ruler
For retrofitting projects, the competitors' seal components are a reliable guide to acceptable seal envelope dimensions, since they have already been installed in the available space. Therefore, by measuring the OD of the existing gland plate, the overall length of the existing sleeve etc., it is safe to conclude that these dimensions will be less than the radial or axial obstructions.
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GUIDE TO MEASUREMENT OF
ROTATING EQUIPMENT INTERNAL TO JOHN CRANE - NOT TO BE RELEASED TO EXTERNAL PARTIES WITHOUT PERMISSION PAGE
6.3.3 Access WindowsWhere the seal assembly may have to pass through an access window, this will be a constraint on the overall dimensions of the seal. Similarly, if a seal is to be fitted from the coupling side of the equipment, the DBSE (Distance Between Shaft Ends) should be noted, since with the coupling removed this dimension will limit the overall length of the seal.
6.4 COOLING / HEATING GALLERIESSome pumps may have galleries around the seal chamber for the purposes of heating or cooling the pump. These are usually evident from the tapped heating (steam) or cooling (water) connections running into the pump casing. The position of these connections and pipes may obstruct the area around the seal, and limit the size / design of the seal installation.NOTE: Where modifications are being proposed to older equipment (e.g. re-bore of seal chamber) with galleries fitted, careful thought must be given to whether the modification is practical. Decreasing the wall thickness of the casing will affect the integrity of the pressure casing. Therefore, any such situations should be referred to the OEM and / or end-user, and John Crane should never take the responsibility for the modification alone.
6.5 DIRECTION OF SHAFT ROTATIONThe direction of shaft rotation is critical for seal designs that include: unidirectional spiral grooves (e.g. Type 2800 series, Type 28 series, Type 28SC, Type
28ST, Type 285 etc.); where there is any likelihood of prolonged reverse rotation a bi-directional seal design should be considered.
The direction of shaft rotation (CW / CCW) should be checked on site by reference to any / all of the following: pump data sheets physical pump (there will normally be an arrow on the bearing housing or pumping
casing) orientation of discharge volute on pump existing seal parts which may have tangential flushing connections or 'handed'
designs site operatorsThe direction of shaft rotation should be recorded as from the motor side. Note that conventionally an API pump will rotate CW while an ANSI pump will rotate CCW, as seen from the motor side. TO BE CHECKED.
6.6 PIPING & UTILITIESFor installations that will have ancillary connections such as API Plan 11 flushing, Plan 62 quenching etc., provisions for these supplies must be checked. This includes checking whether a tapping is provided on the pump discharge for flush recirculation. If on a retrofit project an existing sealant system or heat exchanger is to be used, then the size / location / capacity etc. must be noted, and the piping circuit sketched to include rough overall dimensions, fittings, orifices, and pipe diameters.As above, the position of any obstructions should be noted carefully, so that the seal can be designed for straightforward piping access. The utilities themselves should also be checked, including external flushing pressure and flow rate (API Plan 32) N2 pressure (API Plan 53), steam pressure (API Plan 62), cooling water pressure / temperature / flow etc.
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GUIDE TO MEASUREMENT OF
ROTATING EQUIPMENT INTERNAL TO JOHN CRANE - NOT TO BE RELEASED TO EXTERNAL PARTIES WITHOUT PERMISSION PAGE
6.7 CORROSION / EROSION / CAVITATION etc.Any evidence of corrosion / erosion / cavitation to any parts of the pump in the area of the seal chamber should be noted and discussed with the end-user. This damage may effect seal selection, design and installation, and may necessitate replacement of affected pump parts. Such damage may also indicate problems with some aspect of pump operation that would be detrimental to seal performance; hence, it is in the interests of John Crane to get such problems resolved.In particular, any wear to Critical Surfaces for Sealing and Location (see Section 6.1) should be brought to the attention of the end-user.
7.0 RETROFITS - REUSING EXISTING SEAL PARTS
Note that in some cases the customer may request that parts of the existing competitor's seal (e.g. shaft sleeve or gland plate) be re-used, as a perceived saving in cost. However, this is frequently difficult or impossible; the dimensions of the competitor's parts may force a compromise in the John Crane seal design, and would preclude the supply of a standard cartridge seal.Apart from whether this may or may not be feasible, it also creates a problem of split responsibility for the installation, e.g. John Crane would then be expected to warranty the quality of materials and manufacture for parts not of our supply. Clearly there could be doubts over the design, the material, and any wear or corrosion in service. Therefore, this practice should be avoided unless special circumstances apply.
8.0 UPGRADES FROM GLAND PACKING
One type of retrofit of an existing sealing device is the replacement of gland packing. For older equipments that are being fitted with mechanical seals for the first time, the following key points should be noted: A mechanical seal will usually need more space than the gland packing, however the
space available in a stuffing box (both radial and axial) will be very limited and not intended to accommodate a seal (see Section 6.3 Obstructions).
Due to this space limitation, it is often necessary to reuse the flush connection that normally exists already in the stuffing box; hence, it is important to record the size, axial position, angle and orientation of this connection.NOTE: the axial position of the connection relative to the face of the stuffing box is particularly important, since the effectiveness of the flushing liquid in cooling the seal faces will depend on this.
FlushConnection
Stuffing Box
It is quite possible that wear on the shaft or the face of the seal stuffing box may have taken place from the gland packing installation (see below). Any such wear should be noted and recorded. This may affect the type of seal design used, and in extreme
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GUIDE TO MEASUREMENT OF
ROTATING EQUIPMENT INTERNAL TO JOHN CRANE - NOT TO BE RELEASED TO EXTERNAL PARTIES WITHOUT PERMISSION PAGE
cases may necessitate substantial modification and / or replacement of parts of the rotating equipment before a seal could be installed.
Worn Shaft Worn Face ofStuffing Box
The gland packing follower will typically have been tightened using only 2 gland bolts / studs, however for even tightening of a seal gland plate 4 bolt studs are recommended. Therefore, the feasibility of adding in 2 more bolt studs to the face of the seal chamber should be considered.
9.0 DOUBLE SEALS
The main issues to be considered with double seals are as follows: The seal installation will need more axial (and possibly radial) space than a single
seal; hence, the position of the nearest obstructions is particularly important (see Section 6.3 Obstructions).
There may be a need for a barrier or buffer fluid connection in the pump casing. This may exist from a previous seal or gland packing installation; otherwise, provision would need to be made to provide this.
10.0 PRE-COMMISSIONING EQUIPMENT CHECKS
Prior to commissioning of the rotating equipment, the points given below should be always checked (normally by the end-user). However if these can be checked at an earlier stage during measurement of the seal chamber, this would allow more time to rectify any problems with bearings / alignment / shaft ovality etc.
The readings taken should be checked against the published limits for the seal AND those for the equipment itself. If actual equipment tolerances exceed these limits, this must be discussed with the end-user / OEM as appropriate, to prevent possible seal problems which would result.
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GUIDE TO MEASUREMENT OF
ROTATING EQUIPMENT INTERNAL TO JOHN CRANE - NOT TO BE RELEASED TO EXTERNAL PARTIES WITHOUT PERMISSION PAGE
Figure #1check the shaft and seal chamber dimensionsand surface finishes as noted
1.5 LG x 20° Chamfer
0.8
0.8
surface finish & dimensional check
pre-commissioningpre-commissioningequipment checksequipment checks- 1. dimensions and surface finishes
Figure # 2measure the shaft runout at the seal location - themaximum value should not exceed 0.05mm FIM
ROTATING EQUIPMENT INTERNAL TO JOHN CRANE - NOT TO BE RELEASED TO EXTERNAL PARTIES WITHOUT PERMISSION PAGE
11.0 OTHER TYPES OF EQUIPMENT
This Guide is based around a standard centrifugal pump configuration, since these are the most common equipments encountered in the field. However, for other equipments (e.g. agitators, fans, blowers, steam turbines etc.) similar guidelines apply in most cases. These together with an understanding of the seal type to be installed should ensure that the right measurements and checks are made.
11.1 AGITATORS For agitators the driver unit (motor ' gearbox) may not be removed for seal
installation, as this is a time-consuming process. Rather the maintenance procedure may involve the coupling only being removed, and the seal then installed through an access window. The dimensions of the access window are frequently small and restrict the overall envelope dimensions of the seal. If this is not taken into consideration then the result can be an expensive seal that finally cannot even be installed!
AccessWindow
Shaft runout and vibration levels on agitators are invariably higher than for a pump, because the equipment is larger and alignment less precise. These should be discussed on site, and axial and radial shaft float should be measured if practical. If the equipment is running then it should be possible to qualitatively assess the shaft movement and vibration, e.g. 'normal', 'high' etc. Vibration levels at the area of the seal can be recorded if suitable measurement equipment is available.
Where an integral radial bearing is required in the seal cartridge, the necessary load figures are needed to correctly size the bearing. These may be available from site data sheets or the OEM, or in the case of a retrofit the size / specification of the existing bearing should be noted.
11.2 STEAM TURBINES For steam turbine retrofits (Type 28ST seals) it is common to find that the
equipment on which the seal will be installed is old, and that corrosion has occurred on the casing and / or shaft. This can include steam cuts where the casing material has been eroded by gradual steam leakage over a long period. In some cases this is likely to affect secondary sealing and pilot locations, and can be so severe that there is no option but to request major equipment repairs or replacement before the seal can be reliably installed.
These aspects should be checked well in advance of seal installation if at all possible. The alternative is that the customer must be prepared to expect some
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GUIDE TO MEASUREMENT OF
ROTATING EQUIPMENT INTERNAL TO JOHN CRANE - NOT TO BE RELEASED TO EXTERNAL PARTIES WITHOUT PERMISSION PAGE
'surprises' when the turbine is opened for seal installation, and to carry out necessary repairs in a short time frame. The OEM should be involved in this process if possible.
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GUIDE TO MEASUREMENT OF
ROTATING EQUIPMENT INTERNAL TO JOHN CRANE - NOT TO BE RELEASED TO EXTERNAL PARTIES WITHOUT PERMISSION PAGE
12.0 STUFFING BOX & SLEEVE DATA SHEET (2 pages)
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See spigotdetail
Note: - Irrelevant dimensions and details to be marked as ‘X’.
45º
SPECIALMark location
Viewing from ‘A’, the End View. Indicate which type of layout.
