With its TMON(Oil oiled, +) symbols, DNV stated it comes to be the globe’s very first category culture to offer a professional symbols that includes one more measurement to propeller shaft as well as bearing problem surveillance.
The brand-new symbols offers to better reduce propulsion safety and security danger as well as avoid expensive devices failing, structure on the advantages of the existing TMON course symbols. Current DNV course symbols TMON(Oil oiled) as well as Shaft align are pre-requisites to fulfill the needs for task of TMON(Oil oiled, +).
Marit Laumann, Head of Section, Machinery & & MARPOL at DNV Maritime, stated, “This high-level notation is designed to maximize protection of a vessel’s propulsion shafting system. As a forward-leaning organization and industry leader we are continuously evolving our rules. TMON(Oil lubricated, +) is part and parcel of our holistic focus on long-term proactive damage prevention.”
The sector has actually been with a difficult years with a raised variety of prop shaft birthing problems as well as with differing fads. DNV has actually been concurrently applying particular procedures to alleviate the obstacles. This is among the most recent actions in the direction of boosted surveillance as well as control.
“It is an important development, as an aft bearing damage carries the risk of diminished or total loss of propulsion, expensive repairs and off-hire time, reputational damage and increased insurance premiums,” Laumann stated.
In 2018, DNV presented its Shaft align( 1) as well as Shaft align( 2) symbols with authoritative needs for prop shaft aft birthing layout, installment as well as surveillance. Shaft align consists of alarm systems for the price of birthing temperature level surge as well as insufficient prop immersion, as well as helps with boosted aft birthing efficiency throughout regular as well as severe transforming operating problems.
“Following the positive industry reception of the Shaft align notation, we saw the opportunity to add even more value by combining both Shaft align and TMON notations to offer enhanced monitoring dimensions, design and operating margins through the new notation,” stated DNV Maritime Senior Principal Engineer, Arun Sethumadhavan.
“The aim of the new notation is to raise the level of monitoring even higher to ensure optimal performance of the stern tube bearing. More influencing factors can be monitored in a proactive approach towards failure detection warning. Picking up early signs of, for example, increasing bearing temperature and undesired operational conditions such as incomplete immersion of the propeller, are crucial.
“The new dimension also attends to aft sealing system monitoring with a focus on ensuring lubricant quality and sealing performance depending on the type of seal used. A proactive approach towards the first line barrier of defense has great potential to minimize the threat to the loss of integrity of the stern tube bearing lubricant system and consequences i.e., bearing damages and/or leakage of oil to the sea,” Sethumadhavan included.
Many DNV-classed vessels in procedure are qualified for the updated symbols considering that they currently bring the Shaft align( 1) as well as TMON(Oil oiled) symbols. DNV is currently in conversation with a variety of proprietors for updating their vessels. More ships presently unfinished with the above mix of course symbols will certainly be taken into consideration for the upgrade once they are provided right into the functional stage.The brand-new symbols will certainly be used for brand-new agreements in the brand-new structure stage.
Sethumadhavan clarified that TMON(Oil oiled, +) is not simply one more ‘plus’ qualifier, however a surveillance as well as control measurement on among essential elements guarding the propulsion feature. Operators have the opportunity to accomplish boosted surveillance of their very own vessel systems, protecting the life time of the property with getting very early indication as well as stopping problems that can cause damages.
Rajiv Prabhakar, Fleet Director, Eaglestar, stated, “Safety, efficiency and reliability are paramount to us at Eaglestar. As the operators of the first set of vessels in service which will be assigned the TMON(Oil lubricated, +) class notation, we are certainly looking forward to experiencing the benefits it will bring towards enhancing the vessels’ safety and operational performance. Furthermore, we now also see an added dimension, which will reflect the impact of our efforts to have both Shaft align(1) and TMON(oil lubricated) class notations in place when the vessels were built.”
