application guidelines skf vibracon chocks - marine · pdf fileskf vibracon chocks 2014-08-25...

SKF Vibracon chocks 2014-08-25

Application guidelines

SKF Vibracon chocks

SKF Solution Factory – Marine Services

Contact e-mail address: [email protected]

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1 Executive Summary

SKF Vibracon chocks are permanent, strong and re-usable mounting

chocks for all types of rotating or critically aligned machinery. SKF Vibracon

chocks are mechanically stiff chocks that make accurate mounting and

alignment simple and quick. The SKF Vibracon chock advantages are its

adjustability characteristics, reusability features and the capability to

create the perfect mounting plane within minutes. This makes SKF

Vibracon chock the most economical means to establish precision mounting

and alignment between equipment and foundation.

The SKF Vibracon chock has many configurations and material options to

satisfy technical demands, in end user environments and production line

costs. All SKF Vibracon chocks include the spherical top plate and mating

middle section. This self-leveling configuration accommodates angular

differences up to 4°.

In this manual SKF will inform you about all aspects of the SKF Vibracon. If

you have further questions or if you need additional information, please

remember that SKF Solution Factory - Marine Services is a 24/7 local

organization. Do not hesitate to contact us by phone or e-mail.

Contact e-mail address: [email protected] Phone number: +31 (0)180 48 38 28

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Table of content

1 EXECUTIVE SUMMARY ........................................................................ 2

2 MARKET .......................................................................................... 4

3 THE APPLICATIONS ........................................................................... 5

3.1 Application description ....................................................................... 5

3.1.1 Where to use an SKF Vibracon chock? ................................................................ 5

3.1.2 The need for precise and quick alignment. .......................................................... 5

3.1.3 The need for quick re-alignment. ....................................................................... 5

3.1.4 The need to reduce unplanned failures – To secure vital uptime. ............................ 5

3.1.5 The need of compact and maintenance free designs. ............................................ 6

3.1.6 The need for global availability .......................................................................... 6

4 THE PROPOSAL ................................................................................. 7

4.1 Offer description ............................................................................... 7

4.2 Technical details ............................................................................... 7

4.2.1 SKF Vibracon (type SM) .................................................................................... 7

4.2.2 SKF Vibracon low profile chock (type SM LP) ..................................................... 12

4.2.3 SKF spherical washer (type SMSW) .................................................................. 14

4.2.4 SKF spherical washer low profile (type SMSW LP) ............................................... 16

4.2.5 Additional bottom rings .................................................................................. 17

4.2.6 Extended top plate ........................................................................................ 18

4.2.7 Mounting kits ................................................................................................ 18

4.3 Maintenance and Handling ............................................................... 19

4.4 Mounting and dismounting ............................................................... 23

5 UNIQUE BUYING POINTS .................................................................. 25

5.1 Offer Features ................................................................................ 25

5.2 The Benefits ................................................................................... 25

5.3 Technical advantages ...................................................................... 25

5.4 Commercial advantages ................................................................... 26

6 VARIOUS APPLICATIONS: .................................................................. 27

7 DATASHEETS .................................................................................. 31

8 MOUNTING PROPOSAL ...................................................................... 35

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2 Market

Industry overview

The origin of the SKF Vibracon chock products can be found in a marine

environment. However, the product is applied in many more industries. When components are pre-mounted on a steel base frame, a so called skid,

the necessity for initial and final alignment is apparent. Also for concrete mounted components. The Vibracon does have an impressive track record.

The SKF Vibracon products are known within the following markets and

applications:

- Compressors

- Electric motors

- Industrial fans

- Industrial pumps

- Industrial transmissions

- Machine tools

- Marine / Navy

- Material handling

- Medical and health care

- Metals

- Mining, mineral processing and cement

- Oil and gas / Offshore

- Pulp and paper

- Railways

- Solar energy

- Traditional power

- Wind energy

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3 The Applications

3.1 Application description

3.1.1 Where to use an SKF Vibracon chock?

- Critical rotating equipment - Eliminate soft foot

- Angular difference between machine and the mounting base - Require alignment - Short time frame, no curing time epoxy

- Height adjustment - Request for re-alignment

When to use an SKF Vibracon?

3.1.2 The need for precise and quick alignment.

To avoid noise and vibrations it is critical to have the machinery optimal

aligned. Optimal alignment works also positive on the wear and tear inside the machinery and reduces energy losses and fuel consumption. With the

SKF Vibracon chock the optimal alignment can be reached so the shafts are operating in line and creates an optimal lifetime of the bearings.

3.1.3 The need for quick re-alignment.

Whenever due to for example transport the alignment needs to be

optimised with SKF Vibracon chocks it is very easy to correct the misalignment. This corrective activity needs to go precise, easy and fast.

This to make sure the machinery is operational quickly and without a need for intensive labour.

3.1.4 The need to reduce unplanned failures – To secure vital uptime.

The SKF Vibracon chocks are tightened with decent forces so that the SKF

Vibracon will remain in the same position during operation of the

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machinery. The SKF Vibracon chock has the features from a rigid arrangement combined with benefits to change heights after installation.

3.1.5 The need of compact and maintenance free designs.

By introducing the low profile version the SKF Vibracon chock can also be

used in limited chocking heights. This is also helpful in case of conversion from a grouted chocking to a re-adjustable SKF Vibracon.

3.1.6 The need for global availability

The globalization trend has increased the need of high global availability.

Just-in-time concepts together with multinational production and assembly

put high demands of a highly available distribution chain of components. SKF just has that.

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4 The Proposal

4.1 Offer description

The SKF Vibracon chock is a universal re-adjustable steel chock. Universal

refers to the fact that an SKF Vibracon chock can be used instead of rigid

steel chocks, shims or epoxy resin chocks. Re-adjustable refers to the

possibility of aligning and re-adjusting the chock at every re-alignment

event. The name ”Vibracon” suggests that the elements can absorb

vibrations like a vibration damper.

It is important to realize that the SKF Vibracon chock is absolutely not a

vibration damper (resilient mount).

4.2 Technical details

4.2.1 SKF Vibracon (type SM)

SKF Vibracon chocks are machinery mounting chocks that can be easily

and accurately adjusted. The chocks have the ability to accommodate up to

a 4° angular difference between machine and the mounting base. The SKF

Vibracon chock is installed within a short time-span, mainly without the

need of expensive or invasive machining of the mounting base. The

products’ self-levelling and height-adjustment features eliminate the

possibility of a soft foot during the life cycle of the machinery. Soft foot

resists when one or more feet of a machine differ in height from the

others.

The SKF Vibracon chock: Quick, Easy, Accurate.

Available in

Standard (CS) DIN 1.1191 / 1.0570 Stock item Stainless Steel (SS) DIN 1.4404 (AISI 316L) Stock item

Alloy Steel (AS) DIN 1.7225 Stock item K-Monel 500 (KM) QQ-N-286 On request

Treated (CS-TR) Stock item

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Figure 1: SKF Vibracon chock photo

Figure 2:SKF Vibracon chock (type SM) set up

Figure 3: SKF Vibracon chock (Type SM)

Besides our standard range or materials there is the option to choose for a treated SKF Vibracon chock. When SKF Vibracons are used in humid and

salty climates, an additional protector might be beneficial. In these conditions we recommend to use treated elements.

SKF Vibracon chock

SKF spherical washer

Vibracon

SKF washer

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Stre

ngt

h

Corrosion resistance

SKF Vibracon Chock

+

Heavy duty

Carbon steel treated Carbon Steel

Stainless

+

Metric

Figure 4

Table 1

Vibracon type DIN 1.1191

Carbon Steel

Prodmast code

Bolt hole

[mm]

Height [mm]

Diameter [mm]

SM 12 -CS 9291040012100000100 17 30 – 38 60

SM 16 -CS 9291040016100000100 21 35 – 45 80

SM 20 -CS 9291040020100000100 25 40 – 50 100

SM 24 -CS 9291040024100000100 31 45 – 57 120

SM 30 -CS 9291040030100000100 37 50 – 62 140

SM 36 -CS 9291040036100000100 44 55 – 67 160

SM 42 -CS 9291040042100000100 50 60 – 72 190

SM 48 -CS 9291040048100000100 60 70 – 85 220

SM 56 -CS 9291040056100000100 66 75 – 90 230

SM 64 -CS 9291040064100000100 74 80 - 95 250

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Table 2

Table 3

The SKF Stainless steel Vibracon chocks are applicable in very demanding conditions, like offshore, on deck, or under water equipment.

Vibracon type DIN 1.1191

Carbon Steel

Prodmast code

Bolt hole

[mm]

Height [mm]

Diameter [mm]

SM 12 –CSTR 9291040012105100100 17 30 – 38 60

SM 16 –CSTR 9291040016105100100 21 35 – 45 80

SM 20 –CSTR 9291040020105100100 25 40 – 50 100

SM 24 –CSTR 9291040024105100100 31 45 – 57 120

SM 30 –CSTR 9291040030105100100 37 50 – 62 140

SM 36 –CSTR 9291040036105100100 44 55 – 67 160

SM 42 –CSTR 9291040042105100100 50 60 – 72 190

SM 48 –CSTR 9291040048105100100 60 70 – 85 220

SM 56 –CSTR 9291040056105100100 66 75 – 90 230

SM 64 –CSTR 9291040064105100100 74 80 - 95 250

Vibracon type DIN1.4404

Stainless Steel

Prodmast code

Bolt hole [mm]

Height [mm]

Diameter [mm]

SM 12 -SS 9291040012110000100 17 30 – 38 60

SM 16 -SS 9291040016110000100 21 35 – 45 80

SM 20 -SS 9291040020110000100 25 40 – 50 100

SM 24 -SS 9291040024110000100 31 45 – 57 120

SM 30 -SS 9291040030110000100 37 50 – 62 140

SM 36 -SS 9291040036110000100 44 55 – 67 160

SM 42 -SS 9291040042110000100 50 60 – 72 190

SM 48 -SS 9291040048110000100 60 70 – 85 220

SM 56 -SS 9291040056110000100 66 75 – 90 230

SM 64 -SS 9291040064110000100 74 80 - 95 250

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Imperial

Table 4

Table 5

Table 6


Carbon Steel

Prodmast code

Bolt hole [inch]

Height [inch]

Diameter [inch]

SM 12 -CS 9291040012100000100 0.67 1.18 – 1.50 2.36

SM 16 -CS 9291040016100000100 0.83 1.38 – 1.77 3.15

SM 20 -CS 9291040020100000100 0.98 1.57 – 1.97 3.94

SM 24 -CS 9291040024100000100 1.22 1,77 – 2.24 4.72

SM 30 -CS 9291040030100000100 1.46 1.97 – 2.44 5.51

SM 36 -CS 9291040036100000100 1.73 2.17 – 2.64 6.30

SM 42 -CS 9291040042100000100 1.97 2.36 – 2.83 7.48

SM 48 -CS 9291040048100000100 2.36 2.76 – 3.35 8.66

SM 56 -CS 9291040056100000100 2.60 2.95 – 3.54 9.06

SM 64 -CS 9291040064100000100 2.91 3.15 – 3.74 9.84


Carbon Steel

Prodmast code

Bolt hole [inch]

Height [inch]

Diameter [inch]

SM 12 –CSTR 9291040012105100100 0.67 1.18 – 1.50 2.36

SM 16 –CSTR 9291040016105100100 0.83 1.38 – 1.77 3.15

SM 20 –CSTR 9291040020105100100 0.98 1.57 – 1.97 3.94

SM 24 –CSTR 9291040024105100100 1.22 1,77 – 2.24 4.72

SM 30 –CSTR 9291040030105100100 1.46 1.97 – 2.44 5.51

SM 36 –CSTR 9291040036105100100 1.73 2.17 – 2.64 6.30

SM 42 –CSTR 9291040042105100100 1.97 2.36 – 2.83 7.48

SM 48 –CSTR 9291040048105100100 2.36 2.76 – 3.35 8.66

SM 56 –CSTR 9291040056105100100 2.60 2.95 – 3.54 9.06

SM 64 –CSTR 9291040064105100100 2.91 3.15 – 3.74 9.84


Stainless Steel

Prodmast code

Bolt hole [inch]

Height [inch]

Diameter [inch]

SM 12 -SS 9291040012110000100 0.67 1.18 – 1.50 2.36

SM 16 -SS 9291040016110000100 0.83 1.38 – 1.77 3.15

SM 20 -SS 9291040020110000100 0.98 1.57 – 1.97 3.94

SM 24 -SS 9291040024110000100 1.22 1,77 – 2.24 4.72

SM 30 -SS 9291040030110000100 1.46 1.97 – 2.44 5.51

SM 36 -SS 9291040036110000100 1.73 2.17 – 2.64 6.30

SM 42 -SS 9291040042110000100 1.97 2.36 – 2.83 7.48

SM 48 -SS 9291040048110000100 2.36 2.76 – 3.35 8.66

SM 56 -SS 9291040056110000100 2.60 2.95 – 3.54 9.06

SM 64 -SS 9291040064110000100 2.91 3.15 – 3.74 9.84

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4.2.2 SKF Vibracon low profile chock (type SM LP)

The SKF Vibracon low profile chocks offer an economic solution for repair

projects or fixed design systems where expensive milled chocks, shims or

epoxy resins were applied before. The SKF Vibracon low profile chock is

designed for those applications where the chock height between the

foundation and component has been established by the previous design

and is limited. Unlike other chocking methods the installation procedure

can be realised on a tight schedule and extends the life cycle of the

equipment. A variety of adjustment tools for confined installation spaces is

available.

Available in

Alloy Steel (AS) DIN 1.7225 Stock item Stainless Steel (SS) DIN 1.4404 (AISI 316L) On request

Figure 5:SKF Vibracon chock (type SM-LP)

Figure 6: SKF Vibracon chock (type SM-LP) set up

SKF Vibracon LP Chock

SKF spherical washer

SKF washer

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Figure 7: SKF Vibracon chock (Type SM LP) Metric

Table 7

table 8

Imperial

Table 9

Other materials available on request. Mail to: [email protected]

Vibracon type

DIN 1.7225

Alloy Steel

Product code

Bolt hole [mm]

Height [mm]

Diameter [mm]

SM 16 LP-AS 9291040016100020100 21 20 – 30 80

SM 20 LP-AS 9291040020100020100 25 20 – 30 100

SM 24 LP-AS 9291040024100020100 31 20 – 30 120

SM 30 LP-AS 9291040030100020100 37 20 – 30 140

SM 36 LP-AS 9291040036100020100 44 30 – 40 160

SM 42 LP-AS 9291040042100020100 50 35 – 45 190

Vibracon type

DIN 1.7225

Alloy Steel

Product code

Bolt hole [mm]

Height [mm]

Diameter [mm]

SM 16 LP-ASTR 9291055016125100100 21 20 – 30 80

SM 20 LP-ASTR 9291055020125100100 25 20 – 30 100

SM 24 LP-ASTR 9291055024125100100 31 20 – 30 120

SM 30 LP-ASTR 9291055030125100100 37 20 – 30 140

SM 36 LP-ASTR 9291055036125100100 44 30 – 40 160

SM 42 LP-ASTR 9291055042125100100 50 35 – 45 190

Vibracon type

DIN 1.7225

Alloy Steel

Product code

Bolt hole [inch]

Height [inch]

Diameter [inch]

SM 16 LP-AS 9291040016100020100 0.83 0.79 – 1.18 3.15

SM 20 LP-AS 9291040020100020100 0.98 0.79 – 1.18 3.94

SM 24 LP-AS 9291040024100020100 1.22 0.79 – 1.18 4.72

SM 30 LP-AS 9291040030100020100 1.46 0.79 – 1.18 5.51

SM 36 LP-AS 9291040036100020100 1.73 1.18 – 1.57 6.30

SM 42 LP-AS 9291040042100020100 1.97 1.38 – 1.77 7.48

mailto:[email protected]

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4.2.3 SKF spherical washer (type SMSW)

SKF spherical washers are designed to create an exact parallel plane between the bolt head and the face of the nut.

The main advantages are:

Prevent the need for spot-facing. It automatically adjusts to compensate for angular faults.

Bolt tension is evenly distributed. Increased bolt stretch due to increased clamping length.

Use of high-grade alloy steel gives reduces chance of failure. Eliminates bolt bending.

Reduces bolt fatigue.

Another major advantage of the SKF spherical washer is that it has been

engineered to easily machine down its own height. Standard SKF spherical washers come in alloy steel (AS). SKF stock the standard height and low

profile version.

Figure 9: SKF spherical washer (type SW) set up

Figure 8 Figure 10

SKF spherical washer (to prevent the need for

spot facing)

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Table 10

Table 11

The height of the SKF spherical washer is 60mm/2,36 inch for all types.

Article no.

Product code Metric Imperial

D[mm] d[mm] D[inch] D[inch]

SMSW 16 -AS 9291047016120000100 33 17 1.30 0.67

SMSW 20 -AS 9291047020120000100 42 23 1.65 0.91

SMSW 24 -AS 9291056024120000100 47 27 1.85 1.06

SMSW 27 -AS 9291056027120000100 52 30 2.05 1.18

SMSW 30 -AS 9291056030120000100 56 34 2.20 1.34

SMSW 36 -AS 9291056036120000100 67 40 2.64 1.57

SMSW 42 -AS 9291047048120000100 82 46 3.23 1.81

SMSW 48 -AS 9291047056120000100 92 52 3.62 2.05

SMSW 56 –AS 9291047056120000100 102 59 4.02 2.32

SMSW 64 -AS 9291047064120000100 112 66 4.41 2.60

Article no.

Product code Metric Imperial

D[mm] d[mm] D[inch] D[inch]

SMSW 16 –ASTR 9291047016125100100 33 17 1.30 0.67

SMSW 20 –ASTR 9291047020125100100 42 23 1.65 0.91

SMSW 24 –ASTR 9291047024125100100 47 27 1.85 1.06

SMSW 27 –ASTR 9291047027125100100 52 30 2.05 1.18

SMSW 30 –ASTR 9291047030125100100 56 34 2.20 1.34

SMSW 36 –ASTR 9291047036125100100 67 40 2.64 1.57

SMSW 42 –ASTR 9291047042125100100 82 46 3.23 1.81

SMSW 48 –ASTR 9291047048125100100 92 52 3.62 2.05

SMSW 56 –ASTR 9291047056125100100 102 59 4.02 2.32

SMSW 64 -ASTR 9291047064125100100 112 66 4.41 2.60

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4.2.4 SKF spherical washer low profile (type SMSW LP)

Figure 11

Table 12

Table 13

Other materials and sizes are available on request.

Mail to: [email protected]

Article

no.

Product code Metric Imperial Height (H)

D[mm] d[mm] D[inch] d[inch] Metric[mm] Imperial[inch]

SMSW

16 LP-AS 9291056016120000100 33 17 1.30 0.67 20 0.79

SMSW

20 LP-AS 9291056020120000100 42 23 1.65 0.91 22 0.87

SMSW

24 LP-AS 9291047027120000100 47 27 1.85 1.06 24 0.94

SMSW

27 LP-AS 9291047030120000100 52 30 2.05 1.18 26 1.02

SMSW

30 LP-AS 9291047036120000100 56 34 2.20 1.34 28 1.10

SMSW

36 LP-AS 9291047042120000100 67 40 2.64 1.57 30 1.18

SMSW

42 LP-AS 9291056048120000100 82 46 3.23 1.81 34 1.34

Article

no.

Product code Metric Imperial Height (H)

D[mm] d[mm] D[inch] d[inch] Metric[mm] Imperial[inch]

SMSW

16 LP-

ASTR

9291056016125100100 33 17 1.30 0.67 20 0.79

SMSW

20 LP-

ASTR

9291056020125100100 42 23 1.65 0.91 22 0.87

SMSW

24 LP-

ASTR

9291056024125100100 47 27 1.85 1.06 24 0.94

SMSW

27 LP-

ASTR

9291056027125100100 52 30 2.05 1.18 26 1.02

SMSW

30 LP-

ASTR

9291056030125100100 56 34 2.20 1.34 28 1.10

SMSW

36 LP-

ASTR

9291056036125100100 67 40 2.64 1.57 30 1.18

SMSW

42 LP-

ASTR

9291056042125100100 82 46 3.23 1.81 34 1.34

mailto:[email protected]

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4.2.5 Additional bottom rings

It can be that the maximum element height is not sufficient to bridge the

gap between the mounting surface and the bed plate of the component.

Here it is possible to place an additional bottom ring in order to extend the

maximum height of the SKF Vibracon original and low profile chocks. This

ring will be mounted between the base plate of the chock and the top plate

of the foundation. As an alternative for the additional bottom ring SKF

Solution Factory - Marine Services can also provide SKF Vibracon additional

bottom rings. As a rule of thumb, the height of the chocks should not

exceed the diameter of the elements. For instance the maximum height of

an SKF Vibracon SM30, with a diameter of 140 mm, can go up to a chock

height of 140 mm; with the maximum height of the SM30 of 62 mm this

means a maximum height of the Additional Bottom Ring of 78 mm.

Figure 12: additional bottom ring

Article

code

Diameter metric Diameter imperial Height (H)

D[mm] d[mm] D[inch] d[inch]

ABR-12 66 40 2.36 1.57

To be

specified by

customer

ABR-16 86 50 3.15 1.97

ABR-20 106 60 3.94 2.36

ABR-24 126 80 4.72 3.15

ABR-30 146 95 5.51 3.74

ABR-36 166 105 6.30 4.13

ABR-42 196 125 7.48 4.92

ABR-48 226 155 8.66 6.10

ABR-56 236 165 9.06 6.50

ABR-64 256 185 9.84 7.28

Table 14

Material: St.52-3, C45N or 42CrMo4V. Other materials are available on request.

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4.2.6 Extended top plate

It can be that the maximum element height is not sufficient to bridge the gap between the mounting surface and the bed plate of the component.

Alternatively to the additional bottom ring there is also the possibility to order an extended top plate. This option is on request and applicable when

clients have a preference for having 3 components.

Figure 13: extended top plate

4.2.7 Mounting kits

An SKF mounting kit offers the SKF Vibracon chock together with all

elements needed for accurate installation. This all-in-one mounting kit may

include:

- SKF Vibracon elements

- Additional bottom rings

- SKF spherical washers

- Foundation bolts

- Fitting bolts

- Nuts

- Castle nuts (and pins)

- SKF Vibracon bolt torque calculation

- Plan approval certificate of the classification of your choice

- Material certificates bolting material

Figure 14: Mounting kit

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4.3 Maintenance and Handling

A detailed video on the installation procedure of the SKF Vibracon chock is

available online via www.vibracon.com. Below the steps of the installation

procedure are described.

Step 1 Check foundation quality

a. The bottom ring area of the SKF Vibracon chock should be in full

contact (100%) with the foundation surface.

b. The spherical top part of the chock must have at least 75%

contact with the machine foot.

c. When necessary, any foundation roughness is sandblasted with a

quality of Sa 2.5 minimum or machined Ra 6.3.

d. The contact surface between foundation and bottom ring of the

SKF Vibracon chock should be checked using the bottom ring of

the element, until an evenly distributed bearing surface is

reached. The minimum of this bearing surface is given by the

machinery manufacturer or classification society. In all other

cases, we recommend a minimum bearing surface of 75%.

e. The taper between foundation and machine feet should be less

than 4°.

f. Foundation and machine foot should be free from paint and

grease.

Step 2 The SKF Vibracon chocks’ thread and spherical layers are

protected with Molykote®. The chocks are ready for installation

directly from the package after cleaning the surface!

SKF Solution Factory - Marine Services recommends the use of:

Molykote® type P37 on the screw thread;

Molykote® type TP42 on the convex / concave mating

surface.

http://www.vibracon.com/

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Step 3 Check if the SKF Vibracon chock is placed concentric with the bolt

hole.

Step 4 Alignment of machine.

Keep in mind while aligning the machine to add 0.10 mm

(0.004”) to the target alignment because of the fact that the SKF

Vibracon chock will compress slightly at the moment the

foundation bolts are secured. A feeler gauge can be used to check

if the topplate is in full contact with the bottom of the machinery

feet.

Step 5 Fine-tuning SKF Vibracon heights

When executing the alignment, the SKF Vibracon assists without

the need for trial and error, typical for shims. The table below will assist you to fine-tune the chock height of the SKF vibracons.

Height adjustment

Vibracon type Number of adjustment

holes Thread Pitch 1 hole 1/2 hole

[mm] [mm] [mm]

SM 12 6 1 0,167 0,083

SM 16 8 1,5 0,188 0,094

SM 20 8 2 0,250 0,125

SM 24 8

2 0,250 0,125

SM 30 8

2 0,250 0,125

SM 36 8

2 0,250 0,125

SM 42 8 2 0,250 0,125

SM 48 8 3 0,375 0,188

SM 56 10

3 0,300 0,150

SM 64 10 3 0,300 0,150

SM 80 12 4 0,333 0,167

Table 15

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Step 6 Tighten the foundation bolts. SKF Solution Factory - Marine

Services recommends doing this in several steps (in line with SKF

handbook). During or after tightening of the foundation bolts

recheck the alignment and check for "soft foot". A "soft foot"

occurs if one or more of the SKF Vibracon chocks are not carrying

the same load as the other elements.

Step 7 The bolt tension must be checked after the test run.

SKF Solution Factory - Marine Services recommends the use of

SKF spherical washers in the bolt connection.

If you have any questions, please contact SKF Solution Factory -

Marine Services: +31-(0)180 483828

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Link to Animation:

Installation SKF Vibracon chock and SKF spherical washer: http://youtu.be/FJOQuCh-xdo

Installation SKF Vibracon low profile chock and SKF spherical washer: http://www.youtube.com/watch?v=W_9cnHUPmHk

Brochure:

http://www.skf.com/binary/12-64540/06686_1_EN-SKF-Vibracon-brochure.pdf

http://www.youtube.com/watch?v=W_9cnHUPmHk



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4.4 Mounting and dismounting

SKF Solution Factory – Marine Services advise to use 8.8 graded bolts, yield strength > 630 N/mm², in SKF Vibracon applications. Make sure that

the foundation bolt has a minimum elongation of: 0,20 mm / 0.08 inch.

There are several alternatives to create enough elongation in the foundation bolt. The commonly used measures are mentioned below:

Creating enough clamping length by using an extension sleeve;

Figure 15: Extension Sleeve

Reducing the shank diameter (contact your local dealer or SKF Solution Factory - Marine Services for a calculation of the

elongation).

Figure 16: Reduced Shank Diameter

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The clamping length is the total distance between bolt head and

nut, this distance is equal to the sum of: o Machine foot thickness (bed plate thickness)

o Final SKF Vibracon height o Foundation thickness (top plate thickness)

o Extension sleeve height (alternatively the length of the SKF spherical washer)

Figure 17: Clamping Length

SKF Solution Factory - Marine Services recommends the use of so called SKF spherical washers, of which the final height will be determined after

the alignment has been performed, to ensure 100% mating surface of bolt head and nut mating surface to prevent bending stresses in the bolt

connection.

Figure 18: SKF spherical washer

SKF Solution Factory - Marine Services recommends using spherical

washers with convex/ concave mating surfaces in steel of convex/ conical. The SKF spherical washers have the capability to optimally transfer the

pretension stresses.

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5 Unique Buying Points

5.1 Offer Features

A perfect fitted chock.

Easy in installation without particular knowledge.

Saving alignment time.

Accurate alignment possible before testing, after testing and

launching.

Easy realignment during the life time of the component.

5.2 The Benefits

The SKF Vibracon chock has many advantages compared to other products

such as epoxy resin and steel shims. The key advantages are listed below:

5.3 Technical advantages

SKF Vibracon chock has many configurations and material options to

satisfy technical requirements, in end user environments and production

line costs.

Re-adjustability.

Quick installation.

Quick re-alignment in case of problems or warranty claims.

With the SKF Vibracon chock no curing time is needed as with epoxy resin,

it eliminates the trial and error alignment process characteristics for the

“mill and shim” method and adjustability during the life cycle of the

machinery.

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5.4 Commercial advantages

The SKF Vibracon chock is the most economical means to establish a

perfect mounting plane within minutes and will provide a repeated benefit

for production or service managers.

In packaged units (like generators, compressors, turbines and pump sets)

the benefits are:

No parallel or angular soft foot problems, even when the skid is

twisted;

No machining of the base frame required;

No on site problems to arrange or install shims;

Re-adjustable;

In combination with laser alignment equipment, alignment time

can be reduced by 50%;

Existing chocking systems, steel chocks or epoxy resin with a

height of only 20 mm, can be replaced by the SKF Vibracon low

profile configuration (depending on SKF Vibracon size).

Available at your local SKF distributor.

Onboard vessels for chocking propulsion units and auxiliary equipment:

No preparation and curing time like epoxy resin chocks;

No time consuming fitting and grinding of rigid steel chocks;

Chocking can be carried out when the ship is still in the dry dock,

the alignment check and (if required) realignment has to be carried

out after the ship has been launched;

No parallel or angular soft foot problems, even if the foundation is

not machined;

No machining of foundation, only locally (where the elements will

be fitted) machining can be done if required.

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6 Various applications:

Figure 19: gearbox installed with rectangular SKF Vibracon chocks, due to limited space

Figure 20: compressor standing on SKF Vibracon chocks

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Figure 21: Electro motor in industry on SKF Vibracon chocks

Figure 22: pump skids

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Figure 23: Detail of bracket with SKF Vibracon to create a fixed point

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Figure 24: Overview of engine mounted on SKF Vibracon chocks on a concrete foundation. The additional delivered plate is for reducing the surface pressure.

Figure 25 and 26: SKF Vibracon chocks in industry

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7 Datasheets

Figure 27: Data sheet for SKF Vibracon chock

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Figure 28

SKF Solution Factory - Marine Services

Coloured cells to be filled out

Shipyard / Customer :

Shipname / Project :

New build yard + hullnumber :

IMO number :

Classification society :

Object :

Make / type :

Generator

Mass : (kg)

Power : (kW)

Revolutions : (rpm)

Number of elements : (-)

Foundation bolthole diameter : (mm)

Fitted bolthole diameter : - (mm)

Top View of generator LETTER :

Total length of component : (mm) A

Location first hole (seen from flexible c.) : (mm) B

Pitch between other holes (on one side) : (mm) C

Total width of component : (mm) D

Pitch of boltholes (left to right) : (mm) E

Foundation with (inside) : (mm) F

Foot length : (mm) M

Cross section of mounting detail LETTER :

Top sleeve length : (mm) G

Bed plate thickness : (mm) H

Chock height : (mm) J

Top plate thickness : (mm) K

Bottom sleeve length: (mm) L

Address information

Company :

Contact :

Phone :

Fax :

E-mail :

F-334 REV. 06 D.D. 12.11.2008 © SKF

Remarks:

E-mail: [email protected]

Nikkelstraat 7

2984 AM Ridderkerk

The Netherlands

Website: www.vibracon.com

Vibracon element selection for Generator, E-motor, Pump, Compr.

CO

UP

LIN

G

CO

UP

LIN

G

F DE F E D

A

CB

A

B

M M

C

G

H

J

K

L

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Figure 29






IMO number :


Object :

Make / type :

Engine

Mass : (kg)

Power : (kW)

Revolutions : (rpm)



Fitted bolthole diameter : (mm)

Top View of engine LETTER :

Total length of engine : (mm) A



Total width of engine : (mm) D









Address information

Company :

Contact :

Phone :

Fax :

E-mail :

F-333 REV. 06 D.D. 12.11.2008 © SKF



Nikkelstraat 7

2984 AM Ridderkerk

The Netherlands

Remarks:

Vibracon element selection for Diesel, Gas, Turbine Engines

Stopper clearance in accordancewith manufacturer instructionsSteel side chocks

CO

UP

LIN

G

F E D

B

A

C

G

H

J

K

L

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Figure 30






IMO number :


Object :

Make / type :

Gearbox

Mass : (kg)

Power : (kW)

Revolutions : (rpm)



Fitted bolthole diameter : (mm)

Reduction rate : (-)

Average distance of boltholes : (mm)

Dist. between centre line of shaft and top plate : (mm)

Propulsion efficiency : (N/kW)

(For and aft chocks capable of transmitting 3 times nominal propeller thrust must be installed)

Top View of gearbox LETTER :

Total length of gearbox : (mm) A



Total width of gearbox : (mm) D









Address information

Company :

Contact :

Phone :

Fax :

E-mail :

F-332 REV. 06 D.D. 12.11.2008 © SKF

Vibracon element selection for (Marine) Gearboxes

Remarks:



Nikkelstraat 7

2984 AM Ridderkerk

The Netherlands

CO

UP

LIN

G

C B

A

F E D

G

H

J

K

L

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Phone : +31 (0)180 483828

Fax : +31 (0)180 483829

[email protected]



Classification society : C-factor

Object : 5000

Make / type :

MachineMass (if engine with water +oil) : (kg)

Power : (kW)

Revolutions : (rpm)

Foundation width (bolt distance) : (mm)


Bolthole diameter : (mm)

Correction / Safety factor : (-)

Minimum required Vibracon SM element : (-)

Advised Vibracon SM element : (-)

Element load (maximum) : (kN)

Element load (minimum) : (kN)

Machine load : (kN)

:

Foundation bolts : (-)

Material : (-)

E-modul : 207000 (N/mm²)

Yield stress : (N/mm²)

Elongation foundation bolt : (mm)

Tension per bolt : (kN)

Tensile stress : (N/mm²)

Utilized yield stress : (%)

Von Mises stress (tensile / torsion) : (N/mm²)

Utilized yield stress < 90 % : (%)

Tightening torque : (Nm)

Sheet 1 of 1

Foundation bolt

MS R

EF.

NU

MBER :

Selection of Vibracon SM element

Calculation of holding down bolts' torque

Figure 31

8 Mounting proposal

Figure: 29, 30 and 31

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SKF Solution Factory Marine Services Tel: +31 (0)180 483828 Fax: +31 (0)180 483829 [email protected]

Figure 32

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SKF S

olu

tion F

acto

ry M

arine S

erv

ices

Tel:

+

31 (

0)1

80 4

83828

Fax:

+31 (

0)1

80 4

83829

Vib

racon@

skf.

com

Figure 33

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