The combined effects of the Gaul’s stability shortfalls and duff and offal chute design faults

The principal finding of the 2004 Re-opened Formal Investigation (RFI) into the loss of the Gaul was that flooding of the factory space had occurred through two hull openings in the side of the vessel and that it was probable that this ingress of water led to the capsize and sinking of the Gaul.

Up until December of last year this blog focussed on a number of obvious design faults and flaws in the construction of the duff and offal chutes on the Gaul, and criticised the conduct and outcome of the 2004 RFI which, ignoring these facts had concluded that the flooding and loss of the vessel had been caused by the crew’s failure to close the inner covers of the duff and offal chute hull openings. Recently, however, we have added a summary of the results of a separate investigation, which has revealed significant stability shortfalls (on IMCO’s minimum stability standards [*]) that would have affected the Gaul in a number of her normal operating conditions.

As far the capsize and loss of the vessel is concerned, it should be noted that, while the stability shortfalls and flooding of the factory space through the duff and offal hull openings (facilitated by defective closing arrangements) are two different matters, they do not suggest differing causes for the loss of the Gaul; in fact, the impact of each is complementary to the chain of events which led to the loss of the vessel.

The stability reserves of a trawler may be regarded as a finite but variable quantity, dependent upon the vessel’s condition of loading, disposition of fuel, water etc. If seawater is allowed to flood into the hull, the stability of that trawler is reduced and the possibility of capsizes rises.
The 2004 RFI concluded that an ingress of about 100 tonnes of seawater (entering through her duff and offal chute openings) would have been necessary before the Gaul’s stability reserves would have been depleted to a level where capsize was probable in the weather the vessel encountered.
Our investigation has shown that, because the Gaul’s actual stability reserves were initially much lower than those assumed by the RFI, capsize would have been probable after only a modest ingress of seawater.

However, regardless of the design faults in the chutes’ closing arrangements, the Gaul’s stability problems and their combined effect on the safety of the vessel, the 2004 RFI was still content to attribute her loss to a failure on the part of the crew to close and secure the duff and offal lids during the storm they encountered on 8 February 1974.
Their conclusion, however, appears now extremely far-fetched.
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[*] One of the most important safety standards for a sea-going trawler is that it should meet the IMCO minimum stability criteria, however:

- Compliance with the IMCO minimum stability standard does not guarantee that a trawler will be safe from capsize in severe weather
- A trawler having stability reserves that significantly exceed the IMCO minimum standard is unlikely to capsize in severe weather
- Non-compliance with the IMCO minimum stability standard does not automatically mean that a trawler is likely to capsize in severe weather
- A trawler having stability reserves that fall significantly below the IMCO minimum standard is likely to capsize in severe weather.

Answers in a fishtail

In our previous posts (27 April, 05 May and 12 June), we have discussed the matter of the inner covers to the offal chute on the Gaul and provided photographic evidence from the wreck which showed that these covers had in fact been secured in the closed position prior to the loss of the vessel and that they could have been opened by the forces of the sea before sinking took place.

The 2004 RFI panel thought, however, that the offal chute inner covers – found open on the wreck – had been negligently left so by the crew. (The same explanation was employed in respect of the duff chute inner covers, which had also been found open.) (See also this POST)

It must be mentioned here that the regime on the Gaul was such that the operation of offal chute would have fallen under the jurisdiction of the factory manager and his team, while the operation of the duff chute was under the control of the deck crew.

This arrangement gave the RFI experts the opportunity to claim that the factory deck staff, as non-fishermen, had been ignorant about the importance of keeping the offal chute inner covers closed when not in use and, tragically, had failed to secure them at the end of a busy working day.

Unfortunately, the RFI also failed to draw any conclusions from the relevant information that was available to the inquiry. This information relates to the following facts:

1. The offal chute overboard discharge acted as a relief valve during the fish processing operations and, as such, it would only be used when the fish meal plant (rate = 25 tonnes/day) was operating at full capacity or when the fish meal hold was full (capacity = 120 tonnes)

It is also known that the Gaul skipper’s reports recorded that at the time of the loss, the vessel had only managed to accumulate about 20 tonnes of fish fillets onboard together with about 7 tonnes of fish-meal (i.e. a poor catch for the period she was fishing).
The logical conclusion that follows from these data is that there would have been no need for the factory crew to use the offal chute overboard discharge during the vessel’s last voyage.

2. Furthermore two witnesses (Messrs George Petty and Raymond Smith) testified at the hearings that the offal chute would not have been used during the last two voyages in the Gaul’s short life, simply because the fish meal hold was never filled.

More explanations, quotes and details on the subject have been published at this LINK and HERE (diagram).

Like the rest of the conclusions in the 2004 RFI report, the assumption of negligence by all parts of the crew, no matter how implausible, were forced into relevance and given the status of fact.

Photographic evidence

In our posts of 27 April and 05 May we provided photgraphic evidence from the 2002 underwater survey of the wreck of the Gaul showing damage to the closing arragement of the vessel's offal chute's inner covers. This evidence clearly contradicts the final conclusions of the 2004 Gaul RFI.
As previously advised, we are now presenting a video clip which contains further details on this subject, including a model of the offal chute's inner covers and their probable behaviour when subjected to seawater pressure.

Gaul - offal chute inner covers
Video sent by gadflymotion531

Continuation from previous post

The damage to the forked lug (securing clip) of the offal chute lid, which is visible in the image below, indicates that the crew of the Gaul (prior to the loss of the vessel) had secured the inner covers in the closed position. The covers were subsequently damaged when the sea burst them open.

In the above detail, the normal outline of the forked securing clip was drawn in orange

This evidence clearly negates three of the principal conclusions of the RFI:
1. That proper use of the inner covers would have prevented water ingress
This is incorrect - the above photo indicates that the covers had been used ‘properly’ but, unfortunately, this could not prevent the water ingress.
2. That, at the time of the loss, the inner covers were not closed and secured
This is incorrect – the evidence indicates that not only had the covers been closed and secured at the time of the loss, but also that the forces of the sea subsequently opened them.
3. That, at the time of the loss, there was no physical reason to prevent the crew from closing and securing these covers
The photo shows clearly that the securing arrangements were physically damaged and as such could not be used to secure the covers. It is most likely that this damage occurred ‘at the time of the loss’
Besides, the inner covers were in no way strong enough to be watertight. If they had been, they would not have been damaged.

More to come...

Another bent thing and more damning evidence

If the evidence we have published so far may have presented “an ostensibly compelling case”, to use Mr Jim Fitzpatrick’s expression from a recent letter, the evidence we will be publishing from now on should provide the Minister for Transport with extra certainty. As, in the same letter, he claimed that the information we presented did not constitute the whole picture – a claim with which, for probably different reasons, we agree - we have decided to show you more of that ‘picture’.
In previous posts we have already argued that the RFI assessment, that the inner lids of the duff and offal chutes on the Gaul had been left open by the crew prior to the loss of the vessel, was unsound. The condition of the closing devices of the duff chute indicates that its inner cover was, in fact, closed when the tragedy struck.

We can now reveal that the split covers of the offal chute were also closed. The images below, captured from the 2002 underwater survey film footage, illustrate that the bar attached to one of the offal split covers, as their means of closure, was found in its place and deformed in a way consistent with it having undergone strong pressure from the underside.

This finding, which the RFI panel was aware of, supports the proposition that the inner lids of the duff and offal chutes on the Gaul had initially been closed by the crew, but were burst open by the force of the incoming waves, at the time of the loss.


We have also constructed a model of the offal chute and tested it against the effects of water pressure acting on the underside of its inner lids. We used this model to replicate the damage to the securing bar, as observed in the images from the wreck of the Gaul. The photo below shows the result.

More to come...

Clues and toggles

In continuation of our post of March 09, we are now publishing a DOCUMENT, which points to some differences and similarities in the ways in which the re-opened formal investigations (RFIs) into two major marine accidents: the MV Derbyshire and FV Gaul have been conducted and the reasons why the first was able to deliver better quality results than the second.

We considered the formal investigation into the loss of the MV Derbyshire, in which, initially, the Assessors wrongly concluded - on the basis of a rope seen emerging from the Bosun’s store hatch opening and of a simple examination of the disposition of that hatch’s toggles - that the loss of the vessel had been due to crew error.

In a curiously similar manner, the Gaul RFI also put the blame for the loss of the trawler on the crew, who, the RFI panel claimed, had neglected to close the inner covers to two openings in the hull - this time on the basis of a ligature apparently holding the vessel’s duff chute inner lid in the open position.

However, as the Derbyshire Assessors’ report had been made public two years prior to the RFI court hearings, their findings were openly examined and contested when appropriate and this allowed the court to arrive, in the end, at a set of different and more robust conclusions.

What is worthy of note here is that, in the Derbyshire RFI, it was the subsequent examination by independent experts of the condition and position of the Bosun’s hatch cover’s toggles that led to the rebuttal of the Assessors’ initial verdict of crew error.

Finally, the court concluded that the crew had not failed to secure the hatch lid and that the rope emerging from the Bosun’s store hatch opening was nothing more than post-casualty debris.

Unfortunately, despite the precedent provided by the Derbyshire inquiry, during the Gaul inquiry no external, independent examination of the case was allowed.

In the Gaul Investigation, the report of the Assessors, the retained experts and the court was presented at the end of the RFI as one final document, ‘set in stone’. Nonetheless, a mere glance at the position of the toggles, as shown by the underwater survey footage, suggests that the inner lids of both chutes on the Gaul had been initially closed.

Surprisingly, during the court hearings, neither the strongback bar (which, in conjunction with two toggles, secured the offal chute cover) nor the condition of the toggles was even mentioned.
In addition to and more intriguingly than this oversight is, however, the creative, ‘non-figurative’ manner in which the retained experts produced the drawings of the duff and offal chutes, in their supposedly ‘as found’ condition.

The toggles, which in the underwater survey video footage are clearly shown to be in the ‘hatch closed’ position, appear on the experts’ drawings to be in the ‘hatch open’ position.

The unfortunate effect of these inaccuracies is that it can mislead subsequent examiners into concluding that, since all the toggles were found in the ‘open’ position on the wreck, the court’s finding that the crew had left the hatches open prior to the loss of the vessel is most likely correct.

More about it HERE

Closed Inner Covers

In our post of 18 February 2007 we discussed the conclusion of the 2004 Gaul RFI, which stated that the inner covers of the duff and offal chutes on the Gaul had been left open by the crew – an act of negligence that cost them their lives.
The only ‘evidence’ that the panel relied upon to back their deduction was hanging, literally, by a thread.

Moreover, we can now add, the underwater survey images show that there is a strong possibility that the inner covers had actually been closed and secured by the crew prior to the loss of the vessel.

The attached DOCUMENT explains in more detail how the state (i.e. position and damage) in which the fittings used to secure the inner covers closed (i.e. toggles and lugs) were found at the time of the underwater survey indicates that the covers could have burst open under the pressure of the seawater coming in through the open outer flaps.

Surprisingly, the RFI documents do not mention but once, and in passing, these closing arrangements that were, in effect, at the very centre of the problem area identified by the investigation.
More to come...

Lack of strength

We have previously mentioned that the inner covers of the duff and offal chutes on the Gaul were not designed to be of watertight standard. Our post of 24 September 2007 states that the inner covers of the duff and offal chutes on the Gaul were not watertight, nor were they supposed to be so, and, even closed, they could not have been relied upon to maintain the watertight integrity of the vessel.

We would now like to explain that the main reason why the inner covers on the Gaul were not of a ‘watertight’ standard is because they were deficient in strength.That is the hinges, toggle bolts and steel lugs – the only parts of the covers, which provided the strength or resistance against the forces of the sea – were inadequate.

The paper published HERE gives the details.

More to come…

Debunking fallacies

(The hinged inner covers – part 1)

Over the course of the past year we have revealed a number of serious failings in the conduct and conclusions drawn by the 2004 Gaul RFI panel. Throughout this time, the DfT has, nonetheless, persistently avoided re-opening the debate on this subject and doggedly stuck to the RFI official line.

As the fallacies in their final report were being dismantled, they continued to fend off any controversy by wielding what they thought was their ‘biggest’ argument:

[Regardless of any failings in the investigative process, on the day of the loss, the crew could have closed and secured the inner covers of the duff and offal chutes and this action in itself would have saved the vessel.]

Thus, the officials argue, regardless of any failures of the RFI, the over-riding outcome of the formal investigation (that crew error had been instrumental in the vessel’s loss) is still valid and, therefore, a miscarriage of justice did not occur.

As we are going to demonstrate in our future posts, this argument, also, is fallacious in that it, too, relies on misinterpretations of known facts and on conclusions that have been drawn from incorrect or unsound premises. For instance:

1. The panel concluded that the crew had left the inner covers of the chutes open. Using images from the underwater survey of wreck, they tried to show that one of the inner covers had been tied back in the open position.
   The ligature that supposedly performed this function was clearly just an item of post-casualty debris.
   Moreover, there was evidence indicating quite the opposite –i.e. that both covers might have been closed and secured before the incident happened.
2. The panel stated that the construction of the inner covers was satisfactory, that they were watertight and that, had they been closed, the safety of the vessel would have been assured.
   
   This is not at all correct: the inner covers were neither weathertight nor watertight, they were not even supposed to be so, and, if closed, they could not have been relied upon to maintain the watertight integrity of the vessel.

The chutes had two means of protection against the ingress of water from outside: the outer non-return flaps and the inner covers.
Making a simplistic, although very befitting, analogy we can compare the system for closing the chutes to that used to seal a plastic milk bottle: the threaded plastic cap at the outside, providing the strength barrier against spillage, and the tin foil seal on the inside, meant only to stop leakage.

The Gaul RFI, in their desire to obscure the obvious design flaws of the outer flaps, concluded that, no matter the state of the flaps, had the inner covers been closed and secured, the loss of vessel would have been prevented.
This, going back to our comparison, is like saying that, no matter whether your milk bottle has its plastic cap securely screwed on or not, the tin foil underneath should be enough to prevent the milk from spilling, whatever the circumstances and however roughly you handle the bottle.

Moving the goalposts

In our first POST, dated 31 August 2006 and in the technical paper (pages 15, 26-30) published HERE, we showed how the internationally agreed definitions for ‘watertight’ and ‘weathertight’ (which lay down the required properties for certain ship’s fittings) had been altered in the final report of the 2004 Gaul RFI, by the Investigation panel, in a way that made them looser in requirements and application.

To recap, the RFI definition for ‘watertight’ did not contain the very specific and essential capability of “preventing the passage of water in any direction under a head of water for which the surrounding structure is designed” that the standard definition incorporated, while the definition for ‘weathertight’ replaced the statutory capability that “in any sea conditions water will not penetrate into the vessel” with the less stringent requirement of ”being sealed to exclude water in normal sea conditions”.

Now, you may wonder: why would the RFI panel do such a thing, of creatively re-writing these definitions, rather than simply reproducing the standard ones from the Load Line and other Conventions?

If one looks at this problem in the whole context of the investigation and its outcome, then it becomes apparent that, without these alterations, the findings and the loss scenario that were produced by the investigation panel, would not have held water.

It was only according to these modified definitions that the inner covers of the duff and offal chutes on the Gaul could be categorised as watertight (in reality, these covers were not even of weathertight standard[1]).

Once having wrongly ascribed ‘watertight’ properties to the inner covers, it was then easy to claim, as the 2004 RFI did, that, had these covers been secured in the closed position, the flooding and subsequent loss of the vessel could have been prevented. As the Gaul’s inner covers were found to be open during the underwater survey, the blame for the incident was then immediately placed on the crew, thus avoiding any need for a further proper examination of the faulty outer ‘non-return’ flaps. (See VIDEO clip for a brief demonstration of the design fault)

Hence, we can only infer that: had the RFI panel not assigned properties to the closing arrangements on the duff and offal chutes of the Gaul on the basis of false criteria, they would have had to arrive at the same conclusion as others have: i.e. with the outer non-return flaps properly designed, the vessel would not have sank, regardless of whether the inner covers were open or closed.

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[1] Only in combination with the outer flaps were the inner covers intended to form a weathertight barrier to the sea. The role of the outer flaps was to provide a strength barrier against the force of the waves, and that of the inner covers to simply prevent the leakage.

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Loose ends

In the his opening speech to the Gaul Re-opened Formal Investigation, Nigel Meeson QC, representing the Attorney General, advised on one of the matters on which the RFI should focus:

“…the duff chute …This time a single flap lid, which we can see, is in the open position. It is difficult to see, but if one looks carefully you can see that the chute here is kept in the open position by a wire pinned across the top left-hand corner, which I am indicating now with the laser pen.”
This matter was to become one of the RFI’s principal justifications for concluding that the inner covers of the duff and offal chutes on the Gaul had been secured open by the crew, a fact that was subsequently deemed to have contributed to the loss of the vessel. [1]

The image, taken during the 2002 underwater survey, that Mr Meeson referred to, purportedly shows a wire going across the inner lid.

We have also viewed this picture, as well as the rest of the video footage, and have come to a different conclusion, which we now present in this DOCUMENT.

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[1] The RFI also found that the fact that the outer flaps were found open had been due to corrosion and lack of maintenance. Please see our earlier posts on this issue.

Another small observation

The 2004 Formal Investigation into the sinking of the FV Gaul concluded, as we all know by now, that the cause for the loss of the vessel was the ingress of a large quantity of seawater through the two duff and offal chutes openings in the hull of the vessel.
The double-barrier protections of these openings – the inner covers and the outer flaps - were found to be in the open position during the underwater survey in 2002.
The fact that the outer flaps were found open, the investigation concluded, was due to seizure caused by corrosion in the vessel’s 16 month old flap hinges and failure on the part of the crew and shore maintenance staff to identify and rectify this problem.
The fact that the inner covers were also found open was explained away by crew negligence. However, the trouble with these findings (as we have attempted to explain in our earlier posts) is that they were based on unsubstantiated assumptions.

Let’s take, this time, the presumed corrosion at the flap hinges. (For a few more details on this issue please click HERE.)
As the same combination of materials, mild steel and brass, had been used in a number of other structures on the Gaul (e.g. for the toggles and clips on all weathertight hatches and doors), one would expect similar corrosion problems in those areas.
In reality, though, this doesn’t seem to be the case.
Quite the reverse, as the following clips[1] show, even after 28 years under the sea, the toggles and clips on the Gaul did not present such a level of corrosion and seizure that would prevent them from being easily unscrewed by the ROV[2] arm.

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[1] Extracts from the 2002 MAIB video footage - © Crown copyright
[2] Remote Operated Vehicle

weathertight hatch mild-steel clips & brass bush

weathertight hatch brass toggle & steel toggle bolt


weathertight hatch brass toggle & steel toggle bolt