Choose a Limited MMC oil gauge or Gastight airtight airtight? Surely Restricted is cheaper than Gas-tight, the problem is when to use Restricted and when to use Gas-tight? Please watch the next reading patiently.
The MMC oil gauge (or UTI ruler) is a generic for the Ullage Voids, Temperature Temperature, and Oil/Water Interface. Perhaps because MMC was the first company to manufacture this device
Restricted MMC Oil Gauge
The MMC oil gauge is restrictedor Semi-Closed – which allows a small amount of gas to escape into the atmosphere, the purpose of which is for oil vessels, but has the rules changed? The Restricted version is recognized by the USCG, quoted as below.
[- REFERENCE FOR RESTRICTED DEVICE – THE U.S.C.G. REPORTED THAT “THE COAST GUARD MARINE SAFETY CENTER (MSC) CONCERNING USE OF A RESTRICTED DEVICE (A DEVICE WHICH PERMITS ONLY A SMALL QUANTITY OF CARGO VAPORS TO ENTER THE ATMOSPHERE) CAN BE USED TO COMPLY WITH 45 CFR PART 39.30-1(i).”] (Here)
Gas-tight MMC Oil Gauge (Closed)
The Gas-tight (Closed) MMC oil gauge is structured to ensure complete airtightness. When inserting the ruler into the blocking valve on the measuring tube of the cargo tanks, it forms a completely closed system, which prevents the toxic vapor of the goods from escaping from the tank and creates a closed-type measuring system for that container. This type was born for chemical vessels. Quote below.
Model Number “N-2401-2” is Bi-Mode Function [Ullage/Temp] Device with Closed construction that has been [Gas-Tight] minorly changed from original Semi-Closed construction of Triple Function Device Model “D-2401-2” for use in chemical tank ship.
In case the Chemical tanker for which the Oil-Water Interface Detector is required according to IMO Regulation, and also Closed (Gas-Tight) Device is requested by user, Model number for it becomes “N-2401-2/D-2401-2” in order to model number description approved by IMO. (Here)
So when to use Restricted and when to use Gas-tight?
In recent years, the Regulation on making closed goods is about to be implemented in many port and tank warehouse governments. The measurement of closed goods (do not open the lid of the cargo cellar) depending on the violation that applies is intrusive or not. If intrusion is permitted, the MMC oil gauge is an alternative to the fixed-mounted cargo tunnel continuous level measurement system. Although the cost may not be more economical and the measurement operation is not as effective as automatic measurement, it is simple, portable and does not have to stop the train to construct the fixed system. If intrusion is not allowed, the automatic cargo measuring system must be installed, not to mention the ruler.
So when to use Restricted and when to use Gas-tight? In essence, both Restricted and Gas-tight are 3 in 1: Measuring voids, temperature and list of oil and water oil. The Restricted type is open and limited because it still allows a large amount of gas to escape into the atmosphere. The Gas-tight type is completely sealed. There are vetting inspectors that are very clear for this, but there are Vetting inspectors who just need you to have a ruler.
From TES Industry’s point of view with decades of specializing in oil and offshore equipment, it is closed and open, it is not closed. There’s no semi-closed semi-closed thing, it doesn’t sound square.
1 Single Gas-tight version, used both for gasoline and chemicals.
Update regulations and new demand, Marsen Korea only produces 1 single version, airtight type and can be used both for petroleum and chemicals. Model UTL-200 at a very reasonable price. Both airtight and using petroleum and chemicals but only by the open measurement of the above firms. So obviously, where sealed goods are applied, restricted type has no place to use.