TODO® Safety
Break Away Couplings
Eliminate spillage
The TODO® Safety Break Away couplings are
designed to eliminate spillage and damage
associated with drive / pull away incidents.
The consequences of such incidents can be
very serious without breakaway protection
and occur more frequently than you would
think. The effectiveness of alternative
protection systems is often compromised by
human error.
Measures such as brake interlocks, barriers
and even removing the keys from a tanker
driver can all be defeated, either intentionally or otherwise. The TODO® Safety Break Away coupling
system removes the human error element in this area of product transfer.
The TODO® Safety Break Away coupling uses a double valve arrangement that ensures closure of
both halves before the main seal release to atmosphere. The coupling halves seal automatically
as soon as a movement greater than 1.5 mm is detected between the halves. This important
feature removes the possibility of incomplete closure in partial break away or excessive strain
conditions.
How it works
The coupling (1, normal operating condition) automatically reacts to an excessive load, closes its
valves (2) and then permits disconnection (3).
1 2 3
Features
• Exceptionally high flow rate / low pressure drop.
• Valves in both halves close automatically before the main fluid seal releases to atmosphere.
• Ultra compact design.
• Encapsulated shear bolts.
• Operates independently of shut off other safety systems and does not require an external
power source.
• Marine midhose versions available.
• Easy to reset on site with one person.
Technical Details
Sizes: 2” (DN50) to 3” (DN80).
Materials: Stainless Steel AISI 316L.
Seals: FKM (Viton®) as standard, NBR, EPDM and FFKM on request.
Working pressure: See table in break pins
Test pressure: 37,5 bar each coupling half
Possible break angle: 0-90°, all directions
End connections: BSP- and NPT-threads, different kind of flanges.
Closing time of internal flaps: 0,03 s
Viton® is registered trademarks of DuPont Performance Elastomers.
Dimensions examples (others available)
Connections Dimensions (mm) Weight
Size Picture One side Other side A B C** Kg
DN 50 1 2" BSP or NPT FT 2" BSP or NPT FT 76 76 142 4.90
DN 50 2 2" BSP or NPT FT Flange DN 50 76 A.S.* 152 7.55 * According
to standard.
DN 50 3 Flange DN 50 Flange DN 50 A.S.* A.S.* 162 10.25
** Dimensions
DN 80 1 3" BSP or NPT FT 3" BSP or NPT FT 104 104 171 8.45 of the units with
flanges can
DN 80 2 3" BSP or NPT FT Flange DN 80 104 A.S.* 181 12.05 vary because of
different flange-
DN 80 3 Flange DN 80 Flange DN 80 A.S.* A.S.* 190 15.65
standards.
Flow capacity
TODO® Safety Break Away couplings offer exceptionally high flow capacity for their size.
Alternative designs of
coupling often need to
step up at least one size to
achieve comparable flow
rates.
2" 3"
Media: water.
Temperature: 20°C.
Installation
The valve is designed to be the weakest link for pulling forces and it is recommeded that it is
installed so that the pulling force is perpendicular (90°) to the coupling. See two exampels below.
Certificates / Approvals
• CE-marked, European directives 97/23/EC (PED) and 94/9/EC (ATEX) compliant.
• TDT approval, mark TDT-UW-30/09 towards ADR/RID in Poland.
• Manufactured under EN ISO 9001:2000.
• Certified towards ISO 14001:2004 and OHSAS 18001:2007.
• Manufactured towards EN 13480 and EN 13445.
Break pins
The TODO Safety Break-Away coupling contains 3 break pins of stainless steel,
available in various sizes. The size of the break pins coresponds to the diameter
of the “waist” of the bolt.
Break Forces at Straight Pull
Measured pull forces The table shows the straight pull force that is needed to break 3
pin Ø (mm) kN break pins without internal pressure and external loads.
2.5 12.5
3.0 18.5
3.5 24.9
4.0 33.0
4.5 44.0
Internal pressurized area In order to calculate the straight force created by the internal
pressure please use the following example.
Size cm2 m2
2" 62.2 0.00622 Force (F) = Pressure (P) x Area (A)
3" 107.5 0.01075 Example
3”, 12 bar = 1,2 MPa
Fp = 1,2 x 106 (Pa) x 0,01075 (m2) = 12900 N = 12,9 kN
Maximum allowed working pressure
Disconnect pressure reduced 20 % Maximum allowed working pres-
pin Ø 2" 3" sure is depending on break pins
(mm) p (bar) p (bar) size.
2.5 17 9 The figures in the table is without
3.0 24 14 any external load.
3.5 25 18
4.0 25 24
4.5 25 25
Breaking Moment (90°)
Beneath are break load charts of bending moments on the Y-axis and internal pressure on the X-axis
for the 2” and 3” Safety Break Away coupling respectively. The curves represent a bending moment
with the force acting perpendicular to the coupling.
The sizes of the break pins are 2.5 mm, 3.0 mm, 3.5 mm, 4.0 mm and 4.5 mm.
Breaking moment 2” Safety Break-Away
2"
2500
2000
Breaking Moment [Nm]
1500
4.5 mm
4.0 mm
1000
3.5 mm
3.0 mm
500
2.5 mm
0
0 10 20 30 40 50 60 70 80
Pressure [bar]
Breaking moment 3” Safety Break-Away
3"
2500
2000
Breaking Moment [Nm]
1500
4.5 mm
4.0 mm
1000
3.5 mm
3.0 mm
500
2.5 mm
0
0 5 10 15 20 25 30 35 40 45
Pressure [bar]
Application examples
TODO AB
Box 33, Industrigatan 2-4 ·
S-545 21 Töreboda · Sweden GARDNER DENVER FRANCE SA
Phone +46 506 19940 · Fax : +46 506 19944 Immeuble Le Miroir, 15-17, Boulevard du Gal. de Gaulle
92120 Montrouge · France
EMCO WHEATON UK Limited Phone +33 146 1241-41 · Fax +33 146 1241-59
Channel Road · Westwood Industrial Estate
Margate, Kent CT9 4JR · UK EMCO WHEATON ASIA PACIFIC
Phone +44 1843 221521 · Fax +44 1843 295444 21 - 5F · IOI Business Park · Bandar Puchong Jaya
47100 Puchong Selangor · Malaysia
EMCO WHEATON GmbH Phone +603 8075-7500/ 7900 · Fax +603 8075-4100
Emcostraße 2-4 · 35274 Kirchhain · Germany
Phone +49 6422 84-0 · Fax +49 6422 5100 GARDNER DENVER INTERNATIONAL LTD.
PO Box 30804 · Diraz, Manama · Bahrain
EMCO WHEATON USA, INC. Phone +973 17813187 · Fax +973 17813186
9111 Jackrabbit Road · Houston, Texas 77095 · USA
Phone +1 281 856-1300 · Fax +1 281 856-1325 EMCO WHEATON GmbH
Branch Office CEE
EMCO WHEATON Corp. Blue Danube Park, Objekt 60 · 2100 Korneuburg Austria
2480 Bristol Circle · Oakville, Ontario L6H 5S1 · Canada Phone +43 2262 64281-0 · Fax +43 2262 6428120
Phone +1 905 8298619 · Fax +1 905 8298620
EMCO WHEATON GmbH Sp.z.o.o.
GARDNER DENVER Inc. Oddzial w Polsce
306 Middletown Park Place, Suite D ul. Królewska 57 · 30-081 Kraków · Poland
Louisville, KY 40243 · USA Phone +48 12 2934308 · Fax +48 12 2934309
Phone +1 502 489 3884 · Fax +1 502 489 3882
EMCO WHEATON Regional Sales Office
PO Box 468 · Cross Lane, Tong, Bradford ·
West Yorkshire BD4 0SU · UK
www.todo.se Phone +44 1274 683131 · Fax +44 1274 651006
www.emcowheaton.com
assist@todo.se
assist@emcowheaton.com
