Ch 8-Gauging and calculations (c) Flashcards
What are the three types of gauging equipment?
Open, restricted and closed
What does UTI stand for?
Ullage Temperature Interface
What is restricted gauging equipment?
A portable electronic device, comprises of a calibrated tape terminating in a probe. The device is attached to a vapour lock on the tank
How does restricted gauging equipment work?
When the probe contacts the cargo, a tone is generated and the level can be read on the tape
Why is a restricted gauging device termed this way?
Because when the vapour lock is opened to allow the tape into the tank, a small quantity of the tank atmosphere is released through the device
What is open gauging equipment?
A calibrated sounding tape with a brass ‘bob’ on the end
How does open gauging system equipment work?
The tape is lowered through the tank ullage port. This involves exposing the tank contents to the open atmosphere and hence personnel may be affected
When are open gauging systems not used?
If the ship is inerted or contains particularly toxic cargoes
Why are closed gauging equipment named this way?
Because when in use, there is no release of the tank atmosphere to the deck
When are closed gauging systems required?
For ships operating with inert gas
What is sounding?
Measured from the bottom of the tank to the top of the liquid
What is ullage?
From the gauging point to the top of the liquid
What is on an ullage report?
- Tank number
- Observed ullage (m)
- Corrected ullage (m)
- Temperature (degrees C)
- Observed volume (m3)
- Density at observed temp
- Weight (MT)
For what reason does the vessel calculate the quantity loaded?
As a cross-check on the bill of lading
When measuring the cargo quantity, what must be measured (4)?
Liquid level in the tank
Liquid temperature
Trim
Water
A manual gauging tape is referred to as which type of gauging system?
Open
Table of volume correction factors are entered with…
Density and Temperature
1 US barrel is equivalent to how many litres?
159
A gauging system which does not release vapour into the atmosphere while a measurement is taken is referred to as a…
Closed system
A gauging system which releases only a small quantity of vapour to the atmosphere through a vapour lock while a measurement is taken is referred to as a…
Restricted system
Observed volumes of liquid are converted into standard volumes at which temperatures?
15 degrees C, 60 degrees F
1 cubic meter of oil is equivalent to how many US barrels?
6.28981
Fr most tank cargoes, what is the bill of lading based on?
Shore side measurements
When working in metric units, (°C and cubic metres), with crude oil the volume correction table to be used is
54A
When working in metric units, (°C and cubic metres), with products the volume correction table to be used is
54B
An MMC or UTI gauging device is referred to as which type of gauging system?
Restricted
An often used piece of equipment on a tanker is the UTI. What does the letter ‘I’ stand for?
Interface
A radar gauge is referred to as what type of gauging system?
Closed
