Petal Valve Brochure

7/24/2019 Petal Valve Brochure

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Petal Valve Marine Breakaway Couplings

Minimise offshore hose transfer system oil spills

due to tanker breakout or internal pressure surge incidents

The most reliable and efficient Marine Breakaway Couplings in the world


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Gall Thomson invented the Petal Valve Marine Breakaway Coupling and continues to

be the world leader in the development and delivery of Marine Breakaway Coupling

(MBC) technology.

The Gall Thomson range is the chosen industry standard and this brochure

explains why.

Minimise the risk of spills

Offshore oil spills can delay contract cargo

delivery and add costs to projects. Physical

damage to assets and the environment results

in tanker and terminal downtime and costly

clean-up operations.

Personnel injury can have short and long term

consequences; likely resulting in litigation,

diminished reputation, higher insurance

premiums and investor costs.

All this can compromise the focus and

performance of a business.

The employment of a Gall Thomson Petal Valve

MBC reduces risk and will demonstrate that

the terminal operator responsible has taken all

reasonable steps to enhance terminal safety

and prevent pollution by incorporating a proven,

market leading MBC into the transfer system.

Safe shutdown when it matters

The Gall Thomson Petal Valve MBC provides

an identied safe parting point in marine hose

transfer systems and automatically shuts off oil

ow in the event of an undue overload during

tanker loading or discharging, or an extreme

pressure surge generated by the sudden,

inadvertent closure of a valve downstream of

the MBC during tanker loading.

Product transfer applications

The MBC is suitable for use with crude oil,

heavy fuel oil and other high viscosity products.

Gall Thomson also offers a different design for

employment with light, low viscosity products

such as gasoline, kerosene, diesel, LPG and

similar media.

System applications

lFloating hose strings at SPM CALM / SALM

buoy terminals

lUnderbuoy hose strings at SPM CALM

buoy terminals

lFPSO and FSO floating hose strings

lFPSO and FSO export reeled floating

or catenary hose strings

l

CBM / MBM submarine hose strings

lArticulated Loading Platform in-air

or Submerged Catenary Hose Strings

lSubsea high pressure live crude flexibles

lWell choke and kill emergency

disconnect systems

lOther types of offshore hose

transfer system

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1. Single point mooring, FPSO, FSO, FSU and

other offshore oil terminal production and

bunker floating hose strings.

2. FPSO, FSO, FSU and other offshore oil

terminal product reeled and in-air and

submerged catenary hose strings.

3. Underbuoy and CBM/MBM submarine

hose strings.

4. Subsea and riser high pressure

live crude flexibles.

5. Well choke and kill emergency

disconnect systems.

lAvoid major offshore oil spills

lProtect the environment

lSave the expense of oil spill clear up

lEnhance the safety of your workforce

lPrevent costly system damage

lMinimise tanker/terminal downtime

lAvert negative media attention

lBenefit from lower insurance premiums

lMaximise terminal integrity

lProject a professional company image

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Zero headloss

The fully clear and smooth uninterrupted

bore, means this is the only proven system in

the world with the crucial advantage of zero

headloss: delivering efciency and speeding up

product transfer.

Protected against erosion

and corrosion

Unlike other designs, there is no exposure of

valves and mechanisms to product transfer.

The fully sealed clear bore therefore prevents

wear, erosion and corrosion by protecting

against the product in transfer and seawater

ushing.

No clogging

Exposed mechanisms can clog due to cooled

or non-owing viscous products such as crude

oil. The sealed sleeve bore design of the Gall

Thomson Petal Valve MBC ensures internal

mechanisms are protected; eliminating the risk

of clogging and promoting long life and low

maintenance.

Low maintenance

The simple but effective petal mechanism

minimises moving parts and components

which means there are no axles, shafts, hubs

or bearings to seize. This eliminates the risk of

failure and reduces maintenance costs.

This design can ensure extended, maintenancefree periods of around three to ve years.

Automatic

The system eliminates the human element: it is

automatic and instant.

Self-energised

The shut-off is powered by the energy of the

owing product acting on the petal assembly.

This means the unit is not vulnerable to the

reliability of an external source power supply.

Re-usable

The coupling can be re-instated after a

breakout or installed into a new hose string

during a routine change out.

Breakstud reliability

Due to our rigorous quality procedures during

production, our breakstuds have a reputation

spanning over 30 years for delivering

consistent eld service reliability.

Performance

Proven

Gall Thomson has over 30 years of successful eld experience with a track record of more than 1,500 MBCs

in service in some of the harshest environments in the world.

The Gall Thomson Petal Valve MBC possesses an unprecedented record of performing precisely as expected

saving the hose system and structure from damage and preventing costly clean-up and vessel downtime.

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Long life

The lack of moving parts and protective design

provides a much longer life expectancy when

compared to other types of MBC.

Ease of fitting

The unit ts between standard anges at any

point in the hose assembly.

Robust

The design ensures that operational loads such

as bending moments, torsional stresses and

cyclically applied loads created by wave and

wind motion, tanker movement and pumping

vibration are absorbed and have no adverse

effects on function or condition.

Pigging

The clear and unobstructed bore allows for

convenient and cost efcient internal line

cleaning: eliminating the need to remove the

unit from the hose string.

Compact and lightweight

The compact and lightweight design ensures

there is no detrimental effect on the hose

string. The unit therefore avoids external

mechanical damage and stress fatigue to

adjacent hoses.

Buoyant

Due to the MBCs lightweight construction and

the reserve buoyancy of the adjacent hoses,

additional buoyancy aids are not always

required when installed in a standard oating

hose string and never required when installed

in a submarine or catenary hose string.

Self-reliant

The unit is completely self-contained,requiring no outside systems. This eliminates

dependability on other components or

mechanisms.

Support

Technical expertise and global support

designed to minimise downtime.

Aftersales care

Speak to us about our maintenance and

refurbishment services, extended warranties,

parts and spares.

Minimum product outflow following activation has been confirmed by all 230

successful parting incidents to date*.

*Conrmed by eld operators performance reports. 2012

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Cantilever spring mechanism

The cantilever spring mechanism is a bias andbackup system. It is not depended upon to

close the petal assembly. The springs will effect

closure should there be no product ow when

an activation occurs.

Material composition

Extensive testing of materials includes

chemical, mechanical and electrolytic reaction

during extreme and adverse conditions. The

material composition and manufacturing

process delivers the most robust breakaway

coupling on the market.

Calibration

The unit can be pre-set to precise linear

overload and ow pressure requirements:

to suit individual product and transfer

system parameters.

Controlled closure

Variable closure speeds provide anti-line shock

shutdown to protect up-stream assets such as

pumps and hoses.

Where required for bi-directional transfer

systems, a unit with controlled closure in both

directions is supplied.

Instantaneous closure

Instantaneous closure delivers immediate shut-off.

This is suitable for operations with lower loading

rates or short piping systems where damage to

asset due to instantaneous closure is unlikely.

Specification

Sizes: 3 to 24 nominal bore.

Activation type Controlled closure Instantaneous closure

DOUBLE SHUT-OFF

Linear overload and flow pressure surge Standard Standard

Linear overload Stabilised Stabilised

SINGLE SHUT-OFF

Linear overload and flow pressure surge Standard Standard

Linear overload Stabilised Stabilised

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MBC Petal Valve options


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Double shut-off

Double shut-off provides valve closure on both

the upstream and downstream sides of the

separation point.

Single shut-off

Single shut-off provides valve closure on one

side of the separation point.

Standard MBC

The Standard MBC will activate in two

circumstances. It is the systems safety fuse.

Linear overload:

The Standard MBC will part on linear overload.

This may occur due to a tanker moving

off station due to a manoeuvring fault, an

unexpected wave, wind or general weather

conditions. Where usually in this circumstance

a hose system without a Gall Thomson MBC will

rupture and provoke a spill, the Standard MBC

will activate and shut down the ow.

Flow pressure surge:

The Standard MBC will also activate where an

extreme internal pressure surge occurs: caused

by an unusual event such as an inadvertentvalve closure down-stream. The activation

pressure is set to suit operational requirement.

Stabilised MBC

Linear overload:

The Stabilised MBC will activate on linear

overload as with the Standard MBC.

Flow pressure surge:

The Stabilised MBC will not activate due to

a pressure surge but is instead designed to

possess the same integrity as the rest of the

transfer system. The entire transfer system is

therefore designed to withstand the maximum

internal pressure surge that the system may

generate without damage.

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The Gall Thomson range

Petal Valve Marine Breakaway Coupling

Flip-Flap Marine Breakaway Coupling

Welin Camlock Coupling

Global support and aftersales care

Gall Thomson Environmental Ltd.,

Pommers Lane, Great Yarmouth,

Norfolk, NR30 3PE, United Kingdom

Tel +44 (0) 1493 857936

Fax +44 (0) 1493 850888

[email protected]

Queens Award for Technological Achievement

Product descriptions and specifications are subject to change without prior notice. Gall Thomson recommends that all information and data

are confirmed with our technical department before specifying, ordering or commissioning. Copyright All information provided is subject to

international copyright, trademark and patent laws and cannot be reproduced without the expressed and written permission of Gall Thomson

Environmental Ltd. Trademarks protected: Gall Thomson Petal Gall Thomson Environmental Ltd. Protected by Worldwide Patents.

G.P.E1302 A Signum Technology company

+44 (0) 1493 857936 [email protected] www.gall-thomson.co.uk
http://www.gall-thomson.co.uk/mailto:[email protected]:[email protected]://www.gall-thomson.co.uk/mailto:[email protected]:[email protected]://www.gall-thomson.co.uk/http://www.gall-thomson.co.uk/

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