Poor technique.; Dirty equipment.; Traces of previous cargo.
2
If you do not pay enough attention to the exact requirements of the Customer’s wall wash specification, which of the following may result?
Ваша відповідь правильна:
Over-cleaning.; Unnecessary over use of cleaning chemicals.; Wasted time and manpower.; Tendering of a tank that does not meet the required standard.
3
The basic routine laboratory tests, that we run on board include:
Ваша відповідь правильна:
Appearance.; Hydrocarbons.
4
Wall wash results should be recorded for the following reasons:
Ваша відповідь правильна:
It often figures as an item in Vetting Inspections.; It enables progress to be tracked during tank cleaning.
5
The two kinds of detectable odour in a wall wash sample are:
Ваша відповідь правильна:
Residual.; Characteristic.
6
A drying-oven Non-Volatile Matter test cannot be effectively done on board a ship, because:
Ваша відповідь правильна:
A sufficiently stable and vibration-free platform cannot be provided for the required measurements.
7
A wall wash should not be taken from a hot bulkhead, because:
Ваша відповідь правильна:
Too much Methanol will evaporate.
8
A wall wash should not be taken from a wet bulkhead, because:
Ваша відповідь правильна:
Surface tension and dilution will lead to a less efficient wall wash.
9
All cargoes loaded into Stainless Steel tanks require a wall wash standard of tank cleanliness:
Ваша відповідь правильна:
False.
10
An Inhibitor in a last cargo will almost certainly influence the result in this routine shipboard laboratory test:
Ваша відповідь правильна:
Permanganate Fade Time.
11
Another name for the Hydrocarbon test is “Water Misidentification”:
Ваша відповідь правильна:
False.
12
Blue graduation marks on the side of a test tube may lead to:
Ваша відповідь правильна:
Misinterpretation of low levels of Hydrocarbons.
13
Certain ships routinely carry a stock of wall wash equipment in excess of the recommended levels, if:
Ваша відповідь правильна:
They work in an intensive high-spec trade.
14
Given the specification and observed condition as listed, what would be the priority in the next phase of tank preparation?
Ваша відповідь правильна:
Hydrocarbons.
15
Heavy smokers may, in particular, have a problem accurately conducting this routine laboratory test:
Ваша відповідь правильна:
Odour.
16
Hot bulkheads should be avoided for wall wash, because:
Ваша відповідь правильна:
Of the high evaporation rate of the Methanol.
17
How many drops of Silver Nitrate solution are added to the sample in a Chloride test?
Ваша відповідь правильна:
5.
18
Ideally, a standard wall-wash should be run over which of the following distances?
Ваша відповідь правильна:
At least one metre.
19
If Bleach products have been used in a tank cleaning process, and not properly rinsed away, the following is most likely to be noted in a wall wash analysis:
Ваша відповідь правильна:
Chlorides.
20
If you encountered a new wall wash or analysis procedure, you should:
Ваша відповідь правильна:
Forward full details to Company Operations Department.
21
In a Hydrocarbons test, the presence of moderate to heavy Hydrocarbons is indicated by:
Ваша відповідь правильна:
A milky white discoloration.
22
In a Hydrocarbons test, the presence of slight Hydrocarbons is indicated by:
Ваша відповідь правильна:
A translucent bluish tint.
23
In a Permanganate Fade Time test using Methanol, at what temperature should the samples be maintained?
Ваша відповідь правильна:
15 °C.
24
In a Permanganate Fade Time test, how long should the samples be allowed to “stabilize” before the Permanganate solution is added?
Ваша відповідь правильна:
At least 10 minutes.
25
In a Permanganate Fade Time test, samples should be checked against the standard at the following interval:
Ваша відповідь правильна:
Every 10 minutes.
26
Inhibitor in a previous cargo commonly affects Permanganate Fade Time test results:
Ваша відповідь правильна:
True.
27
Maintaining the samples at a constant temperature is a necessary part of the Permanganate Fade Time test procedure:
Ваша відповідь правильна:
True.
28
Most shore laboratories follow analysis standards laid down by:
Ваша відповідь правильна:
ASTM.
29
Of the four problems listed below and assuming all are included in a customer specification, which would be the priority?
Ваша відповідь правильна:
Moderate Hydrocarbons.
30
Orange or red particles noted in a wall wash sample are an indication of the presence of:
Ваша відповідь правильна:
Rust particles.
31
Permanganate Fade Time is defined as:
Ваша відповідь правильна:
The time elapsed from the “Start” time in the laboratory test until the colour of the sample matches the colour of the ASTM Colour-Standard.
32
Permanganate Fade Time test samples should start off with the following colour:
Ваша відповідь правильна:
A rich, deep purple.
33
Permanganate Fade Time test are run for:
Правильну відповідь:
As long as a customer’s specification requires.
Ваша відповідь:
1 hour.
34
Regular marker pens should not be used to identify sample jars, because:
Ваша відповідь правильна:
Methanol may dissolve the marker ink.
35
Residual Odour is defined as:
Ваша відповідь правильна:
A foreign smell, typically from a previous cargo, found in a wall wash sample, but not present in a “blank”.
36
Soapy bubbles noted on the top of a wall wash sample in a test tube are a likely indication of:
Ваша відповідь правильна:
Residues from a detergent based cleaning chemical.
37
Standard wall wash technique usually involves running a sufficient quantity of industrial water down a tank surface, until all traces of cargo residue disappear from a collected sample:
Ваша відповідь правильна:
False.
38
The Ultraviolet Spectrum test is run to detect:
Ваша відповідь правильна:
Low levels of dissolved impurities.
39
The dish used in a shore laboratory Non-Volatile Matter test is commonly made from:
Ваша відповідь правильна:
Platinum.
40
The following amount of Potassium Permanganate Solution is added to the sample in the Permanganate Fade Time test:
Ваша відповідь правильна:
2 ml.
41
The following important information should be prominently posted in the ships laboratory:
Ваша відповідь правильна:
Material Safety Data Sheets for any chemical in use.
42
The letters “G. C.” in the shore laboratory test stand for:
Правильну відповідь:
Gas Chromatography.
Ваша відповідь:
General Chromatography.
43
The letters “N. V. M.” stand for:
Правильну відповідь:
Non-volatile matter.
Ваша відповідь:
Normal volatile matter.
44
The most apparent effect of samples left standing in test tubes is:
Ваша відповідь правильна:
Accelerated discoloration of the glass.
45
The most likely source of Hydrocarbons detected in a wall wash sample is:
Ваша відповідь правильна:
Traces of previous cargo.
46
The over-riding principle behind a wall wash and the subsequent analysis is:
Ваша відповідь правильна:
Cleanliness.
47
The purpose of a wall wash is to determine:
Ваша відповідь правильна:
Whether a tank meets customer cleanliness requirements.
48
The ratio and components used in the preparation of a Permanganate Solution are:
Ваша відповідь правильна:
0,1 g Permanganate crystals to 0,5 ltr Deionised Water.
49
The risk of odour contamination is most likely in which of the following:
Ваша відповідь правильна:
Tank lid and cleaning hatch packing’s.
50
The sealed reference standard used in a Permanganate Fade Time test is:
Ваша відповідь правильна:
A Platinum Cobalt 500 colour standard.
51
The significant difference with a Whatman Filter Paper test is that it:
Ваша відповідь правильна:
Commonly includes a sample taken from the tank bottom.
52
The two components in a Hydrocarbon test “blank” standard are:
Ваша відповідь правильна:
Methanol and Deionised Water.
53
The wall wash procedures in this programme and those used by the majority of shore laboratories, are built around industry standards issued by the following organisation:
Ваша відповідь правильна:
The American Society for Testing and Materials.
54
To assess the Appearance of a wall wash sample, we:
Ваша відповідь правильна:
Examine the sample in good light and compare to a sample of “good” Methanol.
55
To determine the presence of Chlorides in a wall wash sample, we add:
Ваша відповідь правильна:
5 drops of 10 % Silver Nitrate Solution.
56
Under normal handling conditions, a Permanganate Solution will last for approximately:
Ваша відповідь правильна:
3-5 days.
57
Wall wash samples will not really be affected by an occasional drop of sweat:
Ваша відповідь правильна:
False.
58
When performing a Hydrocarbons test, the sample should be viewed:
Правильну відповідь:
Looking down through the tube against a black background.
Ваша відповідь:
Looking sideways through the tube against a black background.
59
Where possible, a wall wash stream should be run for:
Правильну відповідь:
Minimum 1 metre.
Ваша відповідь:
Maximum 1 metre.
60
Which of the following descriptions is best applied to the “Appearance” of a wall wash sample?
Ваша відповідь правильна:
The overall clarity and content of the sample.
61
Which of the following is a false statement?
Ваша відповідь правильна:
Brown “burn marks” around a Methanol stream are specifically indicative of salt crystals remaining on the bulkhead.
62
Which of the following is unlikely to be the source of Hydrocarbons found in wall wash analysis?
Ваша відповідь правильна:
Inhibitor.
63
Which of the following should be available in the ships laboratory?
Ваша відповідь правильна:
An emergency eyewash bottle.; Material Safety Data Sheets for any chemicals in regular use.; Safety glasses.; A fresh water supply.