Chapter 8

Question 1

Why is it necessary to accurately gauge the oil level in cargo tanks

Answer 1

so you can calculate the volume and weight of cargo onboard n

Question 2

What is restricted equipment

Answer 2

is usually a portable electronic device and comprises a calibrated tape terminating in a probe.

Question 3

Where is restricted equipment attached

Answer 3

To a vapour lock on the tank

Question 4

Why is restricted equipment called restricted equipment

Answer 4

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.

Question 5

How does a restricted device measure cargo

Answer 5

When the probe contacts the cargo a tone is generated and the level can be read on the tape

Question 6

How is open gauging equipment used and what is a downside of this

Answer 6

The tape is lowered through the tank ullage port (usually located on the tank lid). This involves exposing the tank contents to the open atmosphere and hence personnel may be affected, and is not used if the ship is inerted or contains particularly toxic cargoes such as some chemicals

Question 7

What is the design of open gauging equipment

Answer 7

A calibrated sounding tape with a brass ‘bob’ on the end.

Question 8

Why is closed gauging equipment called closed

Answer 8

because when in use there is no release of the tank atmosphere to the deck.

Question 9

What is required for ships operating with inert gas

Answer 9

Closed gauging systems

Question 10

What are the two ways a tank can be measured in

Answer 10

Sounding – measured from the bottom of the tank to the top of the liquid

Ullage – from the gauging point to the top of the liquid

Question 11

What measurement type is more commonly used on tankers

Answer 11

Ullaging is more commonly used on tankers except when the tank is almost empty.

Question 12

What is tank reference height

Answer 12

this is the height measured from the official gauging point to the tank bottom

Question 13

Ideally where should tank reference height be made fom

Answer 13

the official gauging point but this may not always be possible

Question 14

What must be made for any height differences between the actual and official gauging point

Answer 14

Correction

Question 15

If the full reference height is not reached when sounding a tank what may be present

Answer 15

residue

Question 16

What does volume change with

Answer 16

Temp

Question 17

Why would some chartereres give the requirements for measuring weight in vacuum

Answer 17

As the weight in vacuum is always more than the weight in air

Question 18

Why is weight more in vacuum

Answer 18

This is because, like with water, air (and any other medium in which the weight is present) would offer some kind of buoyancy which reduces the weight.

In the vacuum, there is no buoyancy and hence the weight is more than the same weight when measured in air.

Question 19

What will the cargo surveyor provide

Answer 19

Density at a particular temperature and correction factor

A Table of densities at different temperatures

Density at 15 Deg C and ASTM table to use

API Gravity at 60 Deg F and ASTM Table to use

Question 20

What is the density correction factor

Answer 20

At at every degree rise in temp, the density would increase by x

Question 21

How do you calc degrees farenhiet

Answer 21

1.80 x deg c + 32

Question 22

How do you calc 1 US barrel

Answer 22

6.2898 x cubic meter

Question 23

What does UTI stand for

Answer 23

Ullage Temperature Interface

Question 24

1 US barrel is equivalent to what

Answer 24

159 litres

Question 25

When working in metric units, (°C and cubic metres), with crude oil the volume correction table to be used is

Answer 25

54A

Question 26

Observed volumes of liquid are converted into standard volumes at which temperatures?

Answer 26

15 degress c
60 degrees f

Question 27

When working in metric units, (°C and cubic metres), with products the volume correction table to be used is

Answer 27

54B

Question 28

Which factor or property would make the use of a wedge formula inappropriate?

Answer 28

Even keel

Question 29

For most tanker cargoes the bill of lading is based on

Answer 29

Shore side measurements

Question 30

1 cubic meter of oil is equivalent to

Answer 30

6.28981 US barrels

Question 31

An MMC or UTI gauging device is referred to as which type of gauging system?

Answer 31

Restricted

Question 31

Sounding is the distance

Answer 31

The distance from the bottom of the tank to the liquid surface

Question 32

When measuring the cargo quantity which of the following must be measured?

Question 33

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

Question 34

Ullage is

Question 35

Table of volume correction factors are entered with

Question 19

Question 36

A manual gauging tape is referred to as which type of gauging system?

Question 37

For what reason does the vessel calculate the quantity loaded?

Answer 37

As a cross check on the bill of lading

Question 38

A radar gauge is referred to a what type of gauging system

Answer 38

closed

Question 39

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

Answer 39

Restricted