tank gauging
all measurements or calculations from the multiple working sensors. A longer span between sensors in calculating level accuracy is the worst-case scenario for a middle sensor failure. The two most critical sensors are the bottom sensor and vapour sensor. Mass measurement provides
the greatest sensitivity and resolution for detecting authorised or unauthorised product movement and leak detection. The MTG 3012 measures both atmospheric pressure and vapour pressure, so is capable of monitoring the tank for overpressure or the formation of a vacuum should pressure relief valves be improperly set or stick. What is more, from the measurement of vapour pressure, vapour temperature, and the number of tank cycles, it is possible to apply real data to hydrocarbon emissions reporting. Selma of Greece provides tank level gauging
and cargo monitoring technologies that the company says meet the latest requirements of ExxonMobil. Requirement H27 specifies that tankers should be fitted with a manifold pressure cargo oil load/discharge monitoring and recording system located in the cargo control
have an anemometer recorder (recording wind speed and direction), which is critical during cargo load/discharge operations. Developed this year, Selma’s
Tank Protector and integrated CCR monitoring and alarm system meet all the conditions set by ExxonMobil. The system combines cargo oil tank measurement, ballast tanks/ draft level gauging and cargo oil pump temperature monitoring in bearings. The system can also be integrated with an atmospheric oil mist detection system. The Selma Tank Protector
Selma’s tank level gauging and cargo monitoring technologies meet ExxonMobil requirements
room (CCR). Requirement H29/H30 stipulates that existing cargo oil tank (COT) vapour pressure monitoring systems should consist of an independent monitor in the wheelhouse (apart from the existing monitoring system in the CCR) and that four vapour pressure COT alarm set points should be energised (instead of the traditional two set points). Finally, according to Requirement E19, the CCR should
system records the vapour pressure in cargo oil tanks and slop tanks (the typical measuring range is -500mbar to +500 mbar). It also records manifold pressure (measuring 0-16 bar) and wind speed and direction to perform
true or relative calculations depending on whether or not it is connected to a GPS system. Recorded data can be reviewed from colour touch monitor graphs and in Excel format via USB memory sticks. Selma undertakes design, development
and installation of cargo oil tank integrated monitoring systems. The company provides measurement of a cargo oil tank’s level,
API Marine to supply Russian newbuildings
Denmark’s API Marine has signed contracts with Russian shipyards JSC Zavod Krasnoe Sormovo and JSC Okskaya Sudoverf to supply full cargo control, alarm and automation systems for 31 newbuildings being built across the two facilities. Fifteen of the 140m long, 4.2m draught ships
are to be constructed at the Okskaya yard in Navashino for shipowner Volga Flot Tanker, and the other 10 at the Krasnoe Sormovo yard in Nizhny Novgorod. Five of these are for Bash Volga Tanker and five are for Volgotrans. All these three shipowners are part of Volga Shipping. The 6,979 dwt vessels will carry crude oil
and petroleum products, including gasoline, without restrictions for flash-point. They will be allowed to transport two types of cargo simultaneously. When launched, all 25 of these tankers will operate on Russia’s inland waterways during the summer months, and on the Black and Mediterranean Seas in winter. The first vessel is scheduled to be fully operational by the end of 2012. These contracts come against the backdrop
of existing orders to supply tankers under construction at shipyards in Russia and Turkey.
38 I Tanker Shipping & Trade I October/November 2011 2
operator’s computer
19" 2 cargo computer 19" USB 3 printer
1 2 3 4
5 6 7
7 horn Standard * * * ** ** 2 2 6 red lamp * 2 *** LTS3
Operator's station Emergency reports printer Manifold pressure sensor TGD Sensor Red alarm lamp Horn
Designation power cable 2x2.5
cable 2x2x0.75 ethernet cable 2x2x0.75
Cargo level, pressure and temperature sensor TGD in cargo tanks
1 LTS3 5
220 V 4 TGD self-calibration device Manifold pressure sensor TSS/cargo system diagram
www.tankershipping.com
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