FAQ MOTS (Momac-Offshore-Transfer-System): Features of the boat/vessel needed to carry MOTS: What is the recommended vessel technology for MOTS? MOTS can be installed on every vessel type. MOTS minimum dimensions (beam, length, etc.) MOTS 500: Length: 4 m; Beam: 1.8 m; High: app. 3.0 m (sailing position) MOTS 1000: 7 m; Beam: 2.7 m; High: app. 3.5 m (sailing position) Payload at the place of installation MOTS 500: ~ 2,900 kg (without foundation) MOTS 1000: ~ 7,500 kg (without foundation) Payload for control system / UPS Control system: ~ 300 kg (without heater system) UPS (uninterrupted power supply): ~ 300 kg Electrical power 3 AC 400V +/-10%, 16 kva (20 kva if air condition / heating is required) no hydraulics, no risk of environmental pollution! Number of free places for specific staff to use MOTS zero, no specific staff necessary, operated by vessel stuff What is the ideal MOTS installation place bow or stern installation, center line of the vessel, distance center point MOTS socket - frontline basket :~ 3,300mm diameter MOTS socket flange: ~ 1,700 mm, installation room see minimum dimensions Does the vessel need Dynamic Positioning (DP I, DP II, DP III)? MOTS 500: no, a sliding / roller fender system to led the vessel to the boat landing is recommended, the existing rubber fender has too much friction MOTS 1000: yes; if the weight of the vessel is over the acceptable load to the turbine Meteorological and oceanic measures that ensure the MOTS operability: Significant wave height; Maximum wind speed; Maximum wave period depends on the used vessel, vessel movement compensation at the installation point of MOTS 500 max. 3.2 m (z-axes), MOTS 1000 / G max. 4.0 m The maximum significant wave is the wave height where the movement of your vessel at the MOTS installation point is lower than the max. z-compensation of the chosen MOTS system. Max.compensated vessel movement at the installation point: 1,6m/s; Max. vessel acceleration at the point of installation: 3,7m/s2 MOTS staff requirements: Does momac provide the staff to use it? No, only a short training of the operator Staff qualification needed No special staff needed, full automatic transfer process, captain / master is able to operate the system, one day "operator training" after installation
MOTS basic figures: Dimensions MOTS 500 (Length 4 m x Wide 2.2 m x Height 2.45 m) MOTS 1000 (Length 6 m x Wide 2.3 m x Height 3.5 m) Control Panel (W x L x H): 970 mm x 560 mm x 1,320mm Vent station (W x L x H): 970 mm x 560 mm x 1,320mm Uninterruptible power supply (UPS) (W x L x H): 775 mm x 600 mm x 1,842mm Weight MOTS 500 system: 2,300 kg MOTS 500 + ~600 kg MOTS standard socket* + 300 kg control panel** + UPS*** + vessel foundation*** Weight MOTS 1000 system: ~7,500 kg MOTS 1000 + 300 kg control panel ** + UPS*** + vessel foundation*** *= steel version; **= must be placed in dry condition, max. 50m from MOTS ***= optional, depending on the vessel Load capacity (150 kg) Maximum compensatory movements: MOTS 500: max. basket speed: 1,6m/s; max. basket acceleration: 3,7m/s2 MOTS 1000 / G: under construction, similar to MOTS 500 MOTS operation features: Does the MOTS compensate the wave induced movement? What types of movement can the MOTS compensate and its magnitude? Yes, active compensation of vessel movement. The magnitude depends on the used vessel. MOTS 500: max. 3.2 m (z-axes), the vessel is led to the turbine by a fender in X and Y axle. MOTS 1000 is designed for small DP vessels, working area depends from the distance vessel / turbine.
What is the tolerance of movement for the vessel positioning? Is there a DP2 system required? MOTS 500 need no DP system. The vessel has contact to the structure. MOTS 1000/G is designed for small DP vessel. Maximum surge / sway <1,5 m. In DP mode, how close does the ship have to stay to the pile? 4.25 meters to 5.75 meters If MOTS cannot compensate the wave induced movement, what kind of service provides so? Warning signal when movement compensation reserve is less than a defined value of the maximum movement of MOTS, stop of transfer when the actual process is finished. Maximum operating time (without interruptions/breaks) provided by the MOTS no limits What is the average Transfer time to a turbine? MOTS 500: <1 minute / person (starting when the vessel has contact to the turbine) MOTS 1000 / G: 1 minutes / person (starting when the vessel is in position) Could you give us an impression on the indicative reliability of the system, is there a failure rate? MOTS is based on an industrial robot system. The availability of this system is 99,8% with one yearly inspection in 24/365 operation. MOTS will have the same availability. How complex is the maintenance and troubleshoot? Could you provide us an indicative price? Maintenance see MOTS acquisition features. Troubleshoot: MOTS is self-monitoring. Problems / failures are shown in clear text in the operation panel on the bridge. The crew gets an indication of the failure type and behavioral instructions. If necessary momac can make detail diagnostic / bug fixing via remote monitoring (standard feature). After detail diagnostic small repairs can be made by the crew or momac service in the next harbor, mostly over night. Does it require an onsite spare part stock available? If so, what is the related cost? No, a spare part stock is required. Momac offers full service contracts with reaction time guaranty. Are there possibilities to transfer cargo? If so, up to what weight? Yes and No. At the moment we concentrate on personnel transfer. But MOTS can also be used as a stabilized platform to pick up materials / tools by an uncompensated turbine crane. For this operation the basket has to be modified. Max. basket/platform load 150 kg. Do you have some information regarding redundancy in the robot arm? We have 6 axes of freedom in the robot kinematic. To retract MOTS we only need 3. In case of a failure in one of the axis we can retract the robot over the remaining 5 axis. Our safety concept includes an "emergency control system", which is constructed like a shell around the operation control system. In case of a failure which endangers the safe operation the transfer process will be automatically canceled and the robot arm will be retracted out of the collusion zone. Please keep in mind, the basis of MOTS is a very well approved robot arm, which has an availability of over 99,8% in 3-shift operation and a max. load of 500 kg! The main difference is the sea environment. Because of that we use the closed hull which guaranties a controlled environment around the robot. The environment is monitored. Is the system certified? If so, by whom? MOTS is not a ship integrated part. If MOTS fails there is no risk for the ship safety itself. Until now there are no fitting class rules MOTS could be certified against.
MOTS is build according the rules of the EC machinery directive. MOTS has a CE certificate. The installation itself has to be approved by the class of the vessel (stability, seaworthy installation,...). This has to be done by the ship owner. MOTS acquisition features: Delivery time MOTS 500: 4-6 months MOTS 1000/G: 2013 / 2014 Could you give us an impression of the type of maintenance required for the MOS and how is it best to perform it? "Basic contract": - Yearly inspection and safety check (one day on board) (sensor check, surface check, electronic check, mechanical check, safety features) costs: app. 5000 Euro / year excl. travel costs "Evolution contract" available, including - Yearly system update / exchange (takes one day on the quay wall) - Up to 5 years warranty extension, - 48 hr exchange system availability, Costs: depends on the concrete package. Please contact momac. Do you have an indication of costs (day rate)? We think that we mostly will sell MOTS. Based on the upcoming request of the marked we also offer day rates. Please contact momac. MOTS warranty: Has MOTS some kind of warranty? Technical warranty on the complete system. Performance warranty on vessel movement compensation (heave, acceleration and speed) How long is the warranty period? Standard 24 months, warranty extension up to 5 years available (evolution contract)
For more information s please contact momac GmbH & KG, Am Schürmannshütt 39, D-47441 Moers Stefan Leske T: +492841-1802.21 / M: +49172 9890717 / F: +492841-1802.50 e-mail: s.leske@momac.de Web: www.offshore-access-system.com MOTS 500 on a 18m Southboat catamaran MOTS 500 on a 30m tug with Voit Schneider prop MOTS 1000/ G prototype MOTS GA on Voith offshore shuttle