Sit TRASCO GRMP Series, TRASCO GRMALU Series, TRASCO GRB Series, TRASCO GRS Series, TRASCO GRF Series Operating And Maintenance Manual

TRASCO® Couplings

OPERATING AND MAINTENANCE MANUAL

SIT S.p.A. Viale A. Volta, 2 - 20090 Cusago (MI) - Italy

Tel. [phone] Fax [phone] - [e-mail] www.sitspa.com

INDEX

Pag.

1

1.1

1.2

1.3

1.4

1.5

2

2.1

2.1.1

2.1.2

2.1.3

2.1.4

2.1.5

2.1.6

2.1.7

2.2

2.2.1

2.3

3

4

4.1

4.2

4.2.1

4.2.2

4.3

44

4.4.1

4.4.2

4.4.3

5

5.1

5.2

5.3

5.3.1

5.3.2

5.4

5.4.1

5.4.2

5.5

5.6

5.7

5.8

5.8.1

5.8.2

5.9

GENERAL INFORMATION 4

PURPOSE OF THE DOCUMENT 4

PROPER USE 4

WARNING SYMBOLS FOR SAFETY 4

GENERAL ADVICE IN CASE OF DANGER 5

REFERENCE LAWS AND STANDARDS 5

CHARACTERISTICS OF TRASCO® COUPLINGS 5

HUBS 6

GRMP SERIES HUBS 6

GRMALU SERIES HUBS 8

GRB SERIES HUBS 8

GRS SERIES HUBS 10

GRF SERIES HUBS 11

HUBS MACHINING 13

POSITION AND SIZE OF THE SETSCREW 14

ELASTIC SPIDER 15

ELASTIC SPIDER PERFORMANCE 16

COUPLING MISALIGNMENTS 17

STORAGE 17

ASSEMBLING 18

GRMP COUPLING ASSEMBLY 18

GRB COUPLING ASSEMBLING 20

TAPER BUSH MOUNTING 20

TAPER BUSH DISASSEMBLING 21

GRS COUPLING ASSEMBLING 21

GRF COUPLING ASSEMBLING 22

FLANGE-FLANGE VERSION 22

SHAFT-FLANGE VERSION 23

SHAFT-SHAFT VERSION 24

ATEX ANNEX 25

ATEX ZONE CLASSIFICATION 25

ATEX EQUIPMENT CLASSIFICATION 26

APPROPRIATE USE OF TRASCO® COUPLINGS IN ATEX ZONES 26

GAS TEMPERATURE CLASSES FOR GROUP II EQUIPMENT 26

TEMPERATURE CLASSES FOR GROUP I EQUIPMENT 26

MARKING 27

COMPLETE MARKING 27

COMPACT MARKING 27

HUB MACHINING IN ATEX ENVIRONMENT 28

ELASTIC SPIDER CHECK 28

INTERNAL MANUFACTURING CHECK 29

STARTING 29

PROTECTION DEVICES FOR COUPLINGS IN HAZARDOUS ATMOSPHERES 30

ELECTRICAL CONTINUITY 30

DECLARATION OF CONFORMITY 31

INDEX OF TABLES

Pag.

TABLE 2.1

TABLE 2.2

TABLE 2.3

TABLE 2.4

TABLE 2.5

TABLE 2.6

TABLE 2.7

TABLE 2.8

TABLE 2.9

TABLE 2.10

TABLE 2.11

TABLE 4.1

TABLE 4.2

TABLE 4.3

TABLE 5.1

TABLE 5.2

TABLE 5.3

TABLE 5.4

TRASCO®: HUBS MATERIALS 6

DIMENSIONS TRASCO® GRMP 7

TRASCO® GRMP LENGTHS 7

DIMENSIONS TRASCO® GRMALU 8

DIMENSIONS TRASCO® GRB 9

DIMENSIONS TRASCO® GRS 10

DIMENSIONS TRASCO® GRF 11

DIMENSIONS TRASCO® GRF 12

TRASCO®: POSIZIONE GRANO DI FISSAGGIO 14

ELASTIC SPIDER PERFORMANCE 16

TRASCO®: MISALIGNMENTS 17

QUOTE M 19

GRANI BUSSOLE CONICHE 20

GRF SCREWS 22

ATEX ZONE CLASSIFICATION 25

ATEX GROUPS AND CATEGORIES CLASSIFICATION 26

GAS TEMPERATURE CLASSES 26

QUOTE Z FOR CHECKING SPIDER WEAR 28

INDEX OF FIGURES

Pag.

FIGURE 2-1

FIGURE 2-2

FIGURE 2-3

FIGURE 2-4

FIGURE 2-5

FIGURE 2-6

FIGURE 2-7

FIGURE 2-8

FIGURE 2-9

FIGURE 4-1

FIGURE 4-2

FIGURE 4-3

FIGURE 4-4

FIGURE 4-5

FIGURE 4-6

FIGURE 4-7

TRASCO® GRMP HUBS 6

TRASCO® SERIES GRB 8

TRASCO® SERIES GRS 10

TRASCO® GRF HUBS 11

TRASCO® GRF C HUBS 12

PROCESSING TOLERANCE 13

SETSCREW POSITION 14

ELASTIC SPIDER 15

TRASCO®: MISALIGNMENTS 17

GRMP COUPLING 18

GRMP: MOUNTING 19

TYPES OF GRB 20

GRS INTERMEDIATE ELEMENT 21

FLANGE-FLANGE VERSION (CF/CFN) 22

SHAFT-FLANGE VERSION (CF/CFN) 23

SHAFT-SHAFT VERSION (CF/CFN) 24

www.sitspa.com TRASCO® - Operating and Maintenance Manual

1 General information

We recommend that you carefully read all the mounting instructions before installing the coupling, paying particular attention to the safety
instructions.
TRASCO® coupling is suitable for use in potentially explosive atmospheres. When using the coupling in hazardous areas, strictly observe
the special information and instructions regarding safety in the ATEX attachment.

The mounting instructions are part of the product; please keep them safe and close to the coupling.
They are available in electronic format on the website www.sitspa.com.

All the rights of this manual are reserved and are the property of SIT S.p.A.; therefore, its sale and reproduction without permission are
prohibited.

1.1 Purpose of the document

The purpose of this document is the description of the TRASCO
use in potentially explosive environments in accordance with ATEX Directive 2014/34/EU.
All the indications are provided, so that it is properly dimensioned, stored and assembled.
As regards the couplings that have to work in potentially explosive environments, all the indications and standards for identifying the
installation areas for which the coupling is certified to operate in safe conditions are provided.

®

couplings, both in the standard version and in the version suitable for

1.2 Proper use

Before handling a SIT coupling for moving, installing, or performing maintenance, it is advisable to carefully read the mounting instructions.

Any kind of changes aren’t authorized except those expressly provided for in the operating and maintenance manual.
SIT assumes no liability for damage resulting from tampered material and, therefore, no longer original.
SIT reserves the right to make changes to the product; as a consequence, this manual will be updated. The technical specifications listed
in the operating and maintenance manual exactly match the state of the art at the time of printing.

1.3 Warning symbols for safety

The warning symbols included in this manual alert the user to possible risks that may occur during handling, assembling and use of the
coupling.
It is necessary to pay particular attention to them.

STOP

114.01 - Rev. 3 - 24 April 2019 Approved by SIT S.p.A.

DANGER

CAUTION

ATTENTION

PRECAUTION

Danger of injury to persons.

Possible damages to the machine.

Important guidelines to follow.

Hints about explosion protections.

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1.4 General advice in case of danger

DANGER!

Every operation performed on the coupling, either with mounting
or maintenance, must be carried out with the machine not con-

STOP

nected to the power supply. Accidental contact with the rotating
parts can cause serious injury to the operator. It is recommended
to read these operating instructions to ensure safety.

• Affix proper warning signs around the machine

• Instruct the operator before giving permission to work on the coupling

• Operate on the coupling and on the transmission in safe conditions

• Make sure the machine power is disconnected before carrying out any operation

• Do not touch any moving part of the machine and wait until it stops completely

• Protect the coupling against accidental contact with protection devices

1.5 Reference laws and standards

This evaluation was carried out in accordance with the provisions of the relevant laws, directives, standards mentioned below:

DIN 740/2

ATEX DIRECTIVE 2014/34/EU

ATEX GUIDELINES 2014/34/EU

EN 1127-1:2011

EN 13463-1:2009

EN 13463-5:2011

Reference standard for flexible couplings

Equipment and protective systems intended for use in potentially explosive atmospheres

Guidelines to the application of Directive 2014/34/EU

Explosion prevention and protection against explosion. Basic concepts and methodology

Non-electrical equipment for potentially explosive atmospheres. Basic method and requirements

Non-electrical equipment for potentially explosive atmospheres. Constructional safety "c"

®

2 Characteristics of TRASCO

®

TRASCO
is very compact and allows a safe transmission of motion between the motor and the driven machine, absorbing shocks and torsional
vibrations. It also allows, through the elastic deformation of the elastic spider, to compensate for angular, radial and axial misalignments
due to small variations in length of the shafts. The hub teeth and spider profiles are designed so as to obtain a uniform pressure distri­bution.
The elastic element is subject only to compression stress and does not induce any axial or radial stresses, providing the TRASCO®
coupling with great load capacity and durability. The coupling can be assembled both horizontally and vertically, and it correctly tolerates
load variations and reversals.

couplings are a flexible and constant-velocity coupling that ensures maximum performance with same overall dimensions. It

couplings

The TRASCO® series is suitable for use in areas classified with the
presence of flammable gases, vapours and mists or combustible
dusts (Zone 1/21, category 2 GD).
It is designed and built in accordance with the ATEX Directive
2014/34/EU and in accordance with the following European stan
dards:

• EN 1127-1:2011

• EN 13463-1:2009

-

• EN 13463-5:2011

114.01 - Rev. 3 - 24 April 2019 Approved by SIT S.p.A.

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www.sitspa.com TRASCO® - Operating and Maintenance Manual

GRMP...A

AR

GRMP...B

2.1 Hubs

The TRASCO® coupling consists of two metal hubs that have cut-outs with circular sections which contain the teeth of the elastic spider.
The materials of standard hubs are laminated cast iron, spheroidal cast iron or aluminium, depending on the types and sizes.
For details see TABLE 2.1 - TRASCO®: hubs materials.

TABLE 2.1 - TRASCO®: hubs materials

SERIES SIZE STANDARD MATERIAL OPTIONAL MATERIALS

19/24 Steel sintered Steel / Stainless steel / Aluminium / spheroidal cast iron

GRMP

from 24/32 to 90/100 Grey cast iron Steel / Stainless steel / Aluminium / spheroidal cast iron

from 100/110 to 180/200 spheroidal cast iron Steel / Stainless steel / Aluminium / spheroidal cast iron

GRMALU

GRB

GRS

GRF

Table 2.1 - Note: For details contact the Technical Department.

All Aluminium diecast Steel / Stainless steel / Aluminium / spheroidal cast iron

All Grey cast iron Steel / Stainless steel / Aluminium / spheroidal cast iron

All Aluminium Steel / Stainless steel / Aluminium / spheroidal cast iron

All spheroidal cast iron Steel / Stainless steel / Aluminium / spheroidal cast iron

2.1.1 GRMP series hubs

The TRASCO® hubs series GRMP are made, depending on the size, in two versions: A (hollow) and B (full).
They are different for the exterior design and for the maximum bore that can be achieved.
Each of them has the respective AL and BL extended version (TABLE 2.2 - TRASCO® GRMP dimensions, TABLE 2.3 - TRASCO®

GRMP lengths).

Table 2.3 - TRASCO® GRMP lengths

A B AL BL

Figure 2-1 - GRMP TRASCO® Hubs

The milling of the seat of the flexible element of the GRMP guarantees a perfect coupling with the elastic spider in order to ensure a long
life in the correct operating conditions.

H

I

t

E

A

aF

gF

Hub Hub

Mozzo

“A”

114.01 - Rev. 3 - 24 April 2019 Approved by SIT S.p.A.

M

N

P

G

L

H

SS

I

B

bF

Mozzo

gF

“B”

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www.sitspa.com TRASCO® - Operating and Maintenance Manual

Table 2.2 - Dimension TRASCO® GRMP

SIZE Fa

19/24

24/32

28/38

38/45

42/55

48/60

55/70

65/75

75/90

90/100

100/110

110/125

125/145

140/160

160/185

180/200

- 24 - - - - 40 40 16 2 12 18

24 32 8 10 8 10 55 40 55 18 2 14 27

28 38 8 10 8 10 65 48 65 20 2,5 15 30

38 45 10 12 14 14 80 66 80 24 3 18 38

42 55 10 12 16 16 95 75 95 26 3 20 46

48 60 12 12 16 16 105 85 105 28 3,5 21 51

55 70 15 15 16 16 120 98 120 30 4 22 60

65 75 15 15 20 20 135 115 135 35 4,5 26 68

75 90 15 15 22 22 160 135 160 40 5 30 80

90 100 20 20 30 30 200 160 180 45 5,5 34 100

115 - 45 - - - 225 180 - 50 6 38 113

125 - 55 - - - 255 200 - 55 6,5 42 127

145 - 55 - - - 290 230 - 60 7 46 147

160 - 55 - - - 320 255 - 65 8 50 165

185 - 75 - - - 370 290 - 75 9 57 190

200 - 80 - - - 420 325 - 85 11 64 220

Fb

max

Table 2.2 - * dimensions in mm

®

Table 2.3 - TRASCO

GRMP lengths

Fg

max Fb AL BL

E A B M S N G

SIZE

19/24

24/32

28/38

38/45

42/55

48/60

55/70

65/75

75/90

90/100

100/110

110/125

125/145

140/160

160/185

180/200

Execution A Execution B Execution AL Execution BL

H L (A+A) I H L (B+B) I H L (AL+AL) I H L (BL+BL) I

25 66 - - - - - 50 - - 25 66

30 78 24 - 50 128 44 60 128 - 30 78

35 90 28 - 60 160 53 80 160 - 35 90

45 114 37 - 80 214 72 110 214 - 45 114

50 126 40 - 110 246 100 110 246 - 50 126

56 140 45 - 110 278 99 140 278 - 56 140

65 160 52 - 110 280 97 140 280 - 65 160

75 185 61 - 140 315 126 140 315 - 75 185

85 210 69 - 140 350 124 170 350 - 85 210

100 245 81 81 170 425 151 210 425 191 100 245

110 270 89 - - - - - - - 110 270

120 295 96 - - - - - - - 120 295

140 340 112 - - - - - - - 140 340

155 375 124 - - - - - - - 155 375

175 425 140 - - - - - - - 175 425

195 475 156 - - - - - - - 195 475

Table 2.3 - * dimensions in mm

114.01 - Rev. 3 - 24 April 2019 Approved by SIT S.p.A.

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www.sitspa.com TRASCO® - Operating and Maintenance Manual

Ø

d

Ø

d

L

Ø

B

Ø

B

Ø

E

I I

NS

H H

S

M

GRMP...A

AR

GRMP...B

2.1.2 GRMALU series hubs

The TRASCO® GRMALU series hubs are made of die-casting aluminium for A and B versions
(TABLE 2.4 - TRASCO® GRMALU dimensions).

E

Table 2.4 - Dimensions TRASCO® GRMALU

SIZE

19/24

24/32

28/38

38/45

42/55

48/60

Fa

maxFbmax

- 24 - - 40 40 40 66 25 16 2 12 - 18 10 M5

24 32 - - 55 40 55 78 30 18 2 14 24 27 10 M5

28 38 12 28 65 48 65 90 35 20 2.5 15 28 30 15 M6

38 45 22 38 80 66 77 114 45 24 3 18 37 38 15 M8

- 55 - 22 95 - 95 126 50 26 3 20 - 46 20 M8

- 60 - 30 105 - 105 140 56 28 3.5 21 - 51 20 M8

Table 2.4 - * dimensions in mm

Fg

A B

H

I

t

P

A

aF

gF

Hub Hub

Mozzo

“A”

E A B L H M S N I G t P

M

N

G

H

SS

I

B

bF

gF

Mozzo

“B”

L

2.1.3 GRB series hubs

The TRASCO® GRB series couplings for taper bush combines high performance characteristics, typical of standard hub coupling, the
ease of use, assembly and disassembly, resulting from the coupling with a SER-SIT® taper bush. (TABLE 2.5 - TRASCO® GRB dimen-

sions).

They are produced in two versions:

• B1, with bush mounting from the outside of the hub

• B2, with bush mounting from the inside of the hub

B1 B2

H H

H HM

NS S

E

B

d

Ø

Ø

Ø

I I

L

B

d

Ø

Ø

E

B

d

Ø

Ø

Ø

M
NS

I I

L

Figure 2-2 - TRASCO® series GRB

S

B

d

Ø

Ø

114.01 - Rev. 3 - 24 April 2019 Approved by SIT S.p.A.

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www.sitspa.com TRASCO® - Operating and Maintenance Manual

Table 2.5 - DimensionsTRASCO® GRB

SIZE

28/38 1108 (2820) 65 65 66 23 20 2,5 15 -

38/45 1108 (2820) 80 78 70 23 24 3 18 15

42/55 1610 (4025) 95 94 78 26 26 3 20 16

48/60 1615 (4040) 105 104 106 39 28 3,5 21 28

55/70 2012 (5030) 120 118 96 33 30 4 22 20

65/75 2012 (5030) 135 133 101 33 35 4,5 26 19

75/90 2517 (6545) 160 158 130 45 40 5 30 36

90/100 3535 (9090) 200 180 223 89 45 5,5 34 70

SER-SIT SIZE

1108 (2820)

1610 (4025)

1615 (4040)

2012 (5030)

2517 (6545)

3535 (9090)

SER-SIT TAPER

BUSH

[mm] 11-12-14-15-16-17-18-19-20-22-24-25-26-27-28

[inch] 3/8-1/2-5/8-3/4-7/8-1-1 1/8

[mm] 12-14-15-16-18-19-20-22-24-25-26-28-30-32-35-38-40-42

[inch] 3/8-1/2-5/8-3/4-7/8-1-1 1/8-1 1/4-1 3/8-1 1/2-1 5/8

[mm] 12-14-15-16-18-19-20-22-24-25-26-28-30-32-35-38-40-42

[inch] 1/2-5/8-3/4-7/8-1-1 1/8-1 1/4-1 3/8-1 1/2-1 5/8-1 3/4

[mm] 14-15-16-18-19-20-22-24-25-26-28-30-32-35-38-40-42-45-48-50

[inch] 5/8-3/4-7/8-1-1 1/8-1 1/4-1 3/8-1 1/2-1 5/8-1 3/4-1 7/8-2

[mm] 18-19-20-22-24-25-28-30-32-35-38-40-42-45-48-50-55-60-65

[inch] 3/4-7/8-1-1 1/8-1 1/4-1 3/8-1 1/2-1 5/8-1 3/4-1 7/8-2-2 1/8-2 1/4-2 3/8-2 1/2

[mm] 25-35-38-40-42-45-48-50-55-60-65-70-75-80-85-90

[inch] 1 1/2-1 5/8-1 3/4-1 7/8-2-2 1/8-2 1/4-2 3/8-2 1/2-2 5/8-2 3/4-2 7/8-3-3 1/8-3 1/4-3 3/8-3 1/2

E B L H M S N I

BORE DIAMETER (H7)

Tolerance of the seat of the keyway JS9

Torque

[Nm]

1300

5000

150

490

490

800

Table 2.5
* dimensions in mm
** Transmittable friction torque without the keyway

114.01 - Rev. 3 - 24 April 2019 Approved by SIT S.p.A.

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www.sitspa.com TRASCO® - Operating and Maintenance Manual

2.1.4 GRS series hubs

The GRS series hubs are intermediate elements that increase the ability of the coupling to compensate for axial, radial and angular
misalignments.
The presence of two elastic spiders allows a high damping effect of the vibrations, with consequent reduction of the transmission noise
and a reduced wear of the connected components, such as bearings.

Figure 2-3 - TRASCO® GRS series

L

E

Fa

A

Ø

Ø

Ø

S N N S

I I

H C H

Table 2.6 - DimensionsTRASCO

SIZE Fa Fb H V C M S N L E A B G ΔKr ΔKw

24/32

28/38

38/45

42/55

48/60

55/70

65/75

75/90

90/100

9-24 11-32 30 16 52 18 2 14 112 55 40 55 27 0,89 1°30’

9-28 11-38 35 18 58 20 2,5 15 128 65 48 65 30 1 1°30’

11-38 13-45 45 20 68 24 3 18 158 80 66 80 38 1,15 1°30’

11-42 13-55 50 22 74 26 3 20 174 95 75 95 46 1,26 1°30’

13-48 13-60 56 24 80 28 3,5 21 192 105 85 105 51 1,36 1°30’

16-55 16-70 65 28 88 30 4 22 218 120 98 120 60 1,52 1°30’

16-65 16-75 75 32 102 35 4,5 26 252 135 115 135 68 1,75 1°30’

16-75 16-90 85 36 116 40 5 30 286 160 135 160 80 2 1°30’

21-90 21-100 100 40 130 45 5,5 34 330 200 160 180 100 2,5 1°30’

®

GRS

G
Ø

S S

M V M

Fb
Ø

B
Ø

* dimensions in mm

114.01 - Rev. 3 - 24 April 2019 Approved by SIT S.p.A.

10