hydrex magazine 282 hydrex magazine 282 · 3 hydrex magazine 282_hydrex magazine 282.qxd 22/06/20...

Number 187NEWSL E T T E R | 2 8 2

Scrubber overboard pipe repairs in Belgium and the Netherlands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3Ready to travel again and fix your schip . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8Large fuel savings with new propeller surface treatment technique . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Hydrex magazine 282_Hydrex magazine 282.qxd 22/06/20 16:00

ContentsPage 3 - 6

Scrubber overboard pipe repairsin Belgium and the Netherlands

Page 8 - 9

Ready to travel again and fix your ship

Page 10

Large fuel savings with new propeller surface treatment technique

Underwater propeller repairs

When damage to propellersoccurs due to impact with

ice and other debris we can helpyou, even if the damage is quiteextensive. Our teams can restorethe propeller’s balance and effi-ciency.

By taking advantage of the in-housedeveloped cold straightening techni-que, damaged blades can be straight-ened underwater, allowing the shipto return to commercial operationswithout the need to drydock.

If straightening is not an option, the

affected area of the blade will becropped. This is done to achieve thegreatest possible efficiency. Crop-ping is carried out using our propel-ler blade cutting equipment.

Our teams can also carry out anyother repair work on the propeller.Examples of this are the removal and reinstallation of entire propellerblades or replacement of the propel-ler seal ring.

Contact us for more information onunderwater propeller repairs. We areat your disposal 24/7.

Phone: + 32 3 213 5300 (24/7)Fax: + 32 3 213 5321 [email protected]

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Last month our diver/techni-cians carried out scrubber

overboard pipe repairs in Belgiumand the Netherlands. In Flushingthe corroded overboard pipe of a229-meter bulker was replaced. In Antwerp the same was done on a 200-meter roro vessel. In bothcases the new pipe was protectedwith Ecospeed, a chemical resist-ant coating produced by SubseaIndustries.

Exhaust scrubbers are systems thatfilter out all harmful toxins fromexhaust gasses of marine diesel en-gines. These can severely corrodethe pipes of the scrubber which canresult in water ingress if not handledquickly enough.

Scrubber overboard pipe repairs inBelgium and the Netherlands

Corroded scrubber pipe of bulker in Flushing.

Hydrex technician cutting away the old pipe.

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Permanent in-water rudder

repairs now possible without

drydocking

Hydrex has developed an en-tirely new method enabling

permanent repairs of rudders without drydocking the ship.Permanent repairs were hithertonot possible and ships had todrydock in case a major defectwas found. The newly designedequip ment is light-weight andcan be mobilized very rapidly in our special flight containers.Therefore this new service is nowavailable world-wide.

Major defects on rudders very of-ten cause unscheduled drydockingof ships. The new method designedby our technical department allowsengineers, welders and inspectorsto perform their tasks in dry con-ditions. Class approved permanentrepairs on-site, without moving theship, are now possible and com-mercial operations can continue.Steel repairs and replacements canbe performed and pintle and bush-ing defects can be solved withoutthe loss of time and money asso-ciated with drydocking.

The equipment can be mobilizedwithin hours to any port in theworld and is available for rapidmobilization from the Hydrexheadquarters in Antwerp.

Reconnecting the new overboard pipe.

The new pipe was secured with a full penetration weld.

Hydrex welder during installation of the new pipe on the bulker.

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sent by the customer. The teaminstalled this cofferdam over the outlet of the pipe. This allowed themto perform work inside the engineroom without water ingress.

Next the team cut away the old pipe.The shell plating was then preparedfor the installation of the replace-ment part. The new pipe had alsobeen constructed at our warehousein Antwerp with a diffuser and flange already in place. The pipewas then positioned and securedwith a full penetration weld. Nextand independent inspector carriedout NDT testing of the weldingwork.

To prevent the new pipe from corro-ding, the inside was coated withEcospeed. This product is produced

Flushing

A small team traveled to the locationof the bulker to perform an inspec-tion of the damaged pipe on both the waterside and the onboard sideof the hull. This confirmed that the

scrubber outlet was corroded.Replacing the affected part of thepipe in its entirety was the onlyoption.

A cofferdam had been constructed atour workshop based on the drawings

Portside scrubber pipe coated with Ecospeed 8 months ago and still in perfectcondition.

New overboard scrubber pipe with Ecospeed protection on the inside.

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Antwerp. The portside overboardpipe of this vessel had been replacedeight months ago and had also beencoated with Ecospeed at that point.An inspection of the portside piperevealed that the pipe and theEcospeed coating were still in per-fect condition. No further action wasneeded for this pipe.

Conclusion

We offer a full package to ownersthat are experiencing similar dam-age. We replace the corrodedexhaust pipe while your vessel stayson schedule and we make sure thatyou will not have to call us again in a few months’ time for the sameproblem.

Contact us to find out how we canassist you. We are available 24/7.

by Hydrex sister company SubseaIndustries. www.subind.net. Eco-speed is highly chemically resistant.Taking into account the nature of the process taking place inside a scrubber, this is essential for alasting protection of the pipe. Eco-speed can also be used to protect a

newly installed scrubber systemfrom day one.

Antwerp

The same procedure was followedon the corroded starboard overboardscrubber pipe of the roro vessel in

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The heavily corroded starboard side pipe was replaced and given the same protection.

Independent NDT testing of the welding work.


In-water bow thruster repairs

The Hydrex lightweight flexiblemobdocks are designed to be

easily transported around theworld and are used to close off thethruster tunnel on both sides,allowing divers to perform re-pairs and other operations in adry environment around the bowthruster unit.

This technique enables them to reinstall the propeller blades of anoverhauled thruster inside thethruster tunnel after the unit hasbeen secured or replace the bladesor seals and perform repair work ona specific part without removing theunit.

Since the development of this flexi-ble mobdock technique, numerous

thruster repairs have been carriedout by Hydrex diver/techniciansaround the world.

There is no need to send the vessel to drydock as all operationscan be carried out in port or whilethe vessel is stationary at sea.Normal commercial activities cantherefore continue without disrup-tion.


www.hydrex.be

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Ready to travel aga in

Rotterdam, the NetherlandsRudder crack repair S

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Sisimiut, GreenlandEmergency rudder repair

Palm Beach, U.S.A.Insert repair

Grand Isles, Gulf of Mexico, U.S.A.Moonpool hull repair

Algeciras, SShell plating

Veracruz, MexicoDouble seal repair

Tacoma, U.S.A.Bow thruster replacement

Balboa, PanamaStern tube assembly renewal

Punta Del Este, UruguayPipe repair and insert installation

OsBo

U.S.A. – Tampa

Spain - Algeciras

Belgium - Antwerpthe Netherlands – Rotterdam

CaribbeanBow thruster repair in stages

Las Palmas, SpainDoubler plate install

Dakar, SenegalHull repair

Port Gentil, GabonThruster tunnel repair

Lome,Propel

Phone: + 32 3 213 5300 (24/7)[email protected]

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ga in and fix your ship

Tasmania, AustraliaSeal repair and propeller blade replacement

Phuket, ThailandGround repair and thruster operation

herlandsir Skagen, Denmark

Scrubber pipe replacement

SingaporePropeller cropping

Algeciras, SpainShell plating repair

on

Oslo, NorwayBow thruster gearbox repair

werpdam

British Indian Ocean TerritoryPropeller blade straightening

U.A.E.Grounding damage repair

almas, Spainer plate installation

Senegalepair

abonel repair

Lome, TogoPropeller blade straightening

Hydrex offices

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Regular maintenance is easy to schedule and results in ultra-smoothpropeller surfaces. Continuous andlarge fuel savings are now possible.

This award-winning surface treat-ment technique justifies having the

propeller cleaned every time it callsa port.

Please contact us for more infor-mation, we will gladly discuss thebenefits of this new technology withyou.

We discovered an unsophis-ticated but very efficient

technology to enhance propellerblade surfaces. With this methodwe can achieve surface conditionsthat were never seen before. Thiscan only be done underwater.

We have four workboats equippedto deliver this service on a very shortnotice in the Rhine-Scheldt deltafrom Antwerp to Rotterdam.

When a comparison is made be-tween the surface condition of anaverage propeller, as our diversregularly see it, and the smoothnessthat is obtained with our cleaningtechnique, savings are in the 5-10%range. These results are easily a-chieved. The cost of such an oper-ation is very attractive and is veryeasily gained back in a matter ofdays (or even hours).

Large fuel savings with new propellersurface treatment technique

Our workboats are equipped to deliver this service at very short notice.

With our method we can achieve surface conditions never seen before.


Stern tube seal repairs

Using our flexible mobdockmethod to create a dry under-

water environment, we have car-ried out stern tube seal repairsand replacements underwater forsome years now in cooperationwith OEMs.

This technology brings drydock

conditions to the ship rather thanhaving to take the ship to drydock,saving a considerable amount oftime and money in doing so.

This class accepted method is performed by our diving teamsunder our warranty. It can be usedwhile the ship is carrying out its

usual cargo or other commercialoperations in port.

Visit the special stern tube sealrepair section on our website formore information and examples of the many seal repairs we haveperformed in recent years.


www.hydrex.be11


www.hydrex.be

Headquarters Hydrex N.V. - AntwerpPhone: + 32 3 213 5300 (24/7)E-mail: [email protected]

Hydrex Spain - AlgecirasPhone: + 34 956 675 049 (24/7)E-mail: [email protected]

Hydrex LLC - Tampa, U.S.A.Phone: + 1 727 443 3900 (24/7)E-mail: [email protected]

Hydrex RotterdamPhone: +31 10 313 25 19 (24/7)E-mail: [email protected]

We fix ships worldwide


hydrex magazine 282 hydrex magazine 282 · 3 hydrex magazine 282_hydrex magazine 282.qxd 22/06/20...

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