Connect with us

Features

When Deadman could not prevent disaster

Published

on

Biggest marine oil spill in history

 

By Captain Chandra
Godakanda Arachchi
Member of Company of Master Mariners
Gladstone LNG (Oil and gas producer and exporter)

Deepwater Horizon (DH) was a semi-submersible drill rig, which operated in a depth of approximately 1600 metres in the Gulf of Maxico. On charter to British Petroleum (BP), it was drilling possibly to a depth of 2,600 metres below the seabed about 50 miles off the Louisiana coast, within the exclusive economic zone of the US when an explosion occurred on 10 April 2010, killing 11 and injuring 17; 94 workers on board were rescued.

Crude oil and natural gas from the DH well continued to flow post explosion for 87 days until BP finally managed to cap it on 15 July 2010 and shut the flow. Consequently, the incident caused an unprecedented spill (780,000 cubic meters of crude oil as per the government data) although BP mentioned a lower amount. Worse, an unestimable amount of gas escaped into the atmosphere. The accident took a heavy toll on marine life, shore birds, shorelines, beaches, etc., even beyond the Gulf of Mexico. Dolphins, tuna, turtles, etc., died in large numbers. BP took up the challenge of cleaning up the mess, spending huge amount of dollars. Extensive cleaning continued for four long years. BP established a fund, the Gulf Coast Claims Facility with US$ 20 billion, to settle the claims.

The amount of crude oil that escaped from DH well is about 19 times what gushed out of the tanker, Exxon Valdez, which grounded in Alaska in 1989. This amount would have been sufficient for the Sapugaskanda Refinery for more than 100 days.

What went wrong on the fateful day? Here is what is thought to have happened!

Drilling an oil well is a highly skilled and specialised work. Once the site is determined for drilling post seismic surveys of the area, then a drilling rig is assembled at the correct location with all required material including safety gear. Drilling rigs use pipes which are about 20 metres in length, join these together as the drill head finds its way down. Drilling involves creating a flow path (deep hole or a well bore) under reservoir pressure thousands of meters below earth surface. The drill head can pass through various layers of earth crust, which can contain oil, gas and water under pressure, and this can lead to a dangerous unplanned release of oil and gas (or ‘kicks’). If a “kick” is not arrested in time, it can lead to a blowout of oil and gas from the well. In order to control such ‘kicks’, there is a specific piece of safety equipment known as “blowout preventer (BOP), installed close to the seabed, fitted on a larger pipe connected to the rig. Essentially, the drill pipe which is smaller is located inside this larger pipe. The space between the larger pipe and the drill pipe is called the annulus. In order to arrest unplanned ‘kicks’ in the first instance, drilling mud is pumped into the annulus space to create a barrier between the reservoir and the rig pipe work. BOP is used for emergency shutdown (ESD) in case drilling mud fails to arrest the ‘kicks’. The BOP, a complex piece of safety equipment operated electrically under hydraulic pressure, consists of additional layers of protection, depending on the level of the emergency. It will be curtains for the well bore if the last line of defence, “Deadman” is activated as it effectively seals the annulus and the drill pipe completely. Deadman is, therefore, used only as a last resort.

On 20 April, 2010 it was yet another evening for the crew on DH. They had to contend with various operational matters in the process of drilling the wellbore at Mundo Prospect. They were drilling in 5,000 feet of water, a depth not easy at all to reach for any emergency work. There was an undetected ‘kick’ occurring at 2045 hrs with oil and gas moving quickly up the annulus to the rig with 126 crew members on board. Oil and gas pressure was forcing the drill mud on to the rig at 2140 hrs. The crew responded by activating the upper annulus preventer in the BOP. However, activation of BOP did not seal the well, and oil and gas continued to gush out. The crew then responded by closing the pipe shear ram (hydraulic rams crushing the outer pipe to get a seal). Pipe shear rams appeared to have sealed the annulus successfully although that turned out to be only a temporary fix. Oil and gas continued to flow above the rams, which eventually found an ignition source at 2149 hrs, causing an explosion on the rig. As the rams had partially blocked the annulus the pressure above them beginning to drop, creating a big pressure differential between the drill pipe and the annulus. The drill pipe shut from the top at the time was subject to pocket pressure. Investigators believe that huge differential pressure may have contributed to buckling (or bending) of the drill pipe in the centre, thereby shutting mechanisms and rendering them ineffective as rams could not reach the shut-off position. This proved to be catastrophic. Investigators have expressed concern that existing rigs may face similar situations.

Deadman can be operated manually by the crew as a last report or it gets activated automatically when conditions for such activation occur like the loss of main power, hydraulic pressure and communication for the logic controller to send the output (signal) to activate the mechanism. The rig had lost power due to the explosion, and hydraulic pressure owing to the disruption of the hydraulic pressure units, which were probably damaged due to the explosion, thereby causing a loss of pressure. Communication to Deadman from logic controller was also lost. Deadman has a separate logic controller though it is linked to the main logic controller all the time whilst monitoring the conditions and remaining ready for automatic activation if required. Deadman, when activated, under right conditions essentially crushes the pipe work thereby sealing the well bore completely.

Deadman is operated not by main power but by uninterrupted power supply (UPS -battery backup) with 27V and 9 V batteries to power emergency functions and operate shear ram blades. In fact, there is a secondary back-up system (redundant system) for shear rams emergency shutdown as well. But the investigators found evidence to suggest that this vital piece of equipment to be used as a last resort had been wrongly wired and did not function. One system of Deadman shear ram blades got activated, but it faced the problem of the buckled pipe line and could not seal the pipeline completely. If the pipeline not been bucked, the shear ram blades would have greatly reduced the impact of the incident. There was nothing else to stop the massive oil spillage and destruction of the rig.

DH continued to burn for two days before sinking. Crude oil and gas from the well bore continued to pollute the Gulf of Mexico for 87 days. Emergency shutdown systems (ESD), whether on a rig, ship or in any other plant in operation are very important equipment; they must be maintained and tested regularly as required, if disasters like the aforesaid one are to be averted.


Continue Reading
Click to comment

Leave a Reply

Your email address will not be published. Required fields are marked *

Features

Islamophobia and the threat to democratic development

Published

on

There’s an ill more dangerous and pervasive than the Coronavirus that’s currently sweeping Sri Lanka. That is the fear to express one’s convictions. Across the public sector of the country in particular many persons holding high office are stringently regulating and controlling the voices of their consciences and this bodes ill for all and the country.

The corrupting impact of fear was discussed in this column a couple of weeks ago when dealing with the military coup in Myanmar. It stands to the enduring credit of ousted Myanmarese Head of Government Aung San Suu Kyi that she, perhaps for the first time in the history of modern political thought, singled out fear, and not power, as the principal cause of corruption within the individual; powerful or otherwise.

To be sure, power corrupts but the corrupting impact of fear is graver and more devastating. For instance, the fear in a person holding ministerial office or in a senior public sector official, that he would lose position and power as a result of speaking out his convictions and sincere beliefs on matters of the first importance, would lead to a country’s ills going unaddressed and uncorrected.

Besides, the individual concerned would be devaluing himself in the eyes of all irrevocably and revealing himself to be a person who would be willing to compromise his moral integrity for petty worldly gain or a ‘mess of pottage’. This happens all the while in Lankan public life. Some of those who have wielded and are wielding immense power in Sri Lanka leave very much to be desired from these standards.

It could be said that fear has prevented Sri Lanka from growing in every vital respect over the decades and has earned for itself the notoriety of being a directionless country.

All these ills and more are contained in the current controversy in Sri Lanka over the disposal of the bodies of Covid victims, for example. The Sri Lankan polity has no choice but to abide by scientific advice on this question. Since authorities of the standing of even the WHO have declared that the burial of the bodies of those dying of Covid could not prove to be injurious to the wider public, the Sri Lankan health authorities could go ahead and sanction the burying of the bodies concerned. What’s preventing the local authorities from taking this course since they claim to be on the side of science? Who or what are they fearing? This is the issue that’s crying out to be probed and answered.

Considering the need for absolute truthfulness and honesty on the part of all relevant persons and quarters in matters such as these, the latter have no choice but to resign from their positions if they are prevented from following the dictates of their consciences. If they are firmly convinced that burials could bring no harm, they are obliged to take up the position that burials should be allowed.

If any ‘higher authority’ is preventing them from allowing burials, our ministers and officials are conscience-bound to renounce their positions in protest, rather than behave compromisingly and engage in ‘double think’ and ‘double talk’. By adopting the latter course they are helping none but keeping the country in a state of chronic uncertainty, which is a handy recipe for social instabiliy and division.

In the Sri Lankan context, the failure on the part of the quarters that matter to follow scientific advice on the burials question could result in the aggravation of Islamophobia, or hatred of the practitioners of Islam, in the country. Sri Lanka could do without this latter phobia and hatred on account of its implications for national stability and development. The 30 year war against separatist forces was all about the prevention by military means of ‘nation-breaking’. The disastrous results for Sri Lanka from this war are continuing to weigh it down and are part of the international offensive against Sri Lanka in the UNHCR.

However, Islamophobia is an almost world wide phenomenon. It was greatly strengthened during Donald Trump’s presidential tenure in the US. While in office Trump resorted to the divisive ruling strategy of quite a few populist authoritarian rulers of the South. Essentially, the manoeuvre is to divide and rule by pandering to the racial prejudices of majority communities.

It has happened continually in Sri Lanka. In the initial post-independence years and for several decades after, it was a case of some populist politicians of the South whipping-up anti-Tamil sentiments. Some Tamil politicians did likewise in respect of the majority community. No doubt, both such quarters have done Sri Lanka immeasurable harm. By failing to follow scientific advice on the burial question and by not doing what is right, Sri Lanka’s current authorities are opening themselves to the charge that they are pandering to religious extremists among the majority community.

The murderous, destructive course of action adopted by some extremist sections among Muslim communities world wide, including of course Sri Lanka, has not earned the condemnation it deserves from moderate Muslims who make-up the preponderant majority in the Muslim community. It is up to moderate opinion in the latter collectivity to come out more strongly and persuasively against religious extremists in their midst. It will prove to have a cementing and unifying impact among communities.

It is not sufficiently appreciated by governments in the global South in particular that by voicing for religious and racial unity and by working consistently towards it, they would be strengthening democratic development, which is an essential condition for a country’s growth in all senses.

A ‘divided house’ is doomed to fall; this is the lesson of history. ‘National security’ cannot be had without human security and peaceful living among communities is central to the latter. There cannot be any ‘double talk’ or ‘politically correct’ opinions on this question. Truth and falsehood are the only valid categories of thought and speech.

Those in authority everywhere claiming to be democratic need to adopt a scientific outlook on this issue as well. Studies conducted on plural societies in South Asia, for example, reveal that the promotion of friendly, cordial ties among communities invariably brings about healing among estranged groups and produces social peace. This is the truth that is waiting to be acted upon.

Continue Reading

Features

Pakistan’s love of Sri Lanka

Published

on

By Sanjeewa Jayaweera

It was on 3rd January 1972 that our family arrived in Karachi from Moscow. Our departure from Moscow had been delayed for a few weeks due to the military confrontation between Pakistan and India. It ended on 16th December 1971. After that, international flights were not permitted for some time.

The contrast between Moscow and Karachi was unbelievable. First and foremost, Moscow’s temperature was near minus 40 degrees centigrade, while in Karachi, it was sunny and a warm 28 degrees centigrade. However, what struck us most was the extreme warmth with which the airport authorities greeted our family. As my father was a diplomat, we were quickly ushered to the airport’s VIP Lounge. We were in transit on our way to Rawalpindi, the airport serving the capital of Islamabad.

We quickly realized that the word “we are from Sri Lanka” opened all doors just as saying “open sesame” gained entry to Aladdin’s cave! The broad smile, extreme courtesy, and genuine warmth we received from the Pakistani people were unbelievable.

This was all to do with Mrs Sirima Bandaranaike’s decision to allow Pakistani aircraft to land in Colombo to refuel on the way to Dhaka in East Pakistan during the military confrontation between Pakistan and India. It was a brave decision by Mrs Bandaranaike (Mrs B), and the successive governments and Sri Lanka people are still enjoying the fruits of it. Pakistan has been a steadfast and loyal supporter of our country. They have come to our assistance time and again in times of great need when many have turned their back on us. They have indeed been an “all-weather” friend of our country.

Getting back to 1972, I was an early beneficiary of Pakistani people’s love for Sri Lankans. I failed the entrance exam to gain entry to the only English medium school in Islamabad! However, when I met the Principal, along with my father, he said, “Sanjeewa, although you failed the entrance exam, I will this time make an exception as Sri Lankans are our dear friends.” After that, the joke around the family dinner table was that I owed my education in Pakistan to Mrs B!

At school, my brother and I were extended a warm welcome and always greeted “our good friends from Sri Lanka.” I felt when playing cricket for our college; our runs were cheered more loudly than of others.

One particular incident that I remember well was when the Embassy received a telex from the Foreign inistry. It requested that our High Commissioner seek an immediate meeting with the Prime Minister of Pakistan, Mr Zulifikar Ali Bhutto (ZB), and convey a message from Mrs B. The message requested that an urgent shipment of rice be dispatched to Sri Lanka as there would be an imminent rice shortage. As the Ambassador was not in the station, the responsibility devolved on my father.

It usually takes about a week or more to get an audience with the Prime Minister (PM) of a foreign country due to their busy schedule. However, given the urgency, my father spoke to the Foreign Ministry’s Permanent Sectary, who fortunately was our neighbour and sought an urgent appointment. My father received a call from the PM’s secretary around 10 P.M asking him to come over to the PM’s residence. My father met ZB around midnight. ZB was about to retire to bed and, as such, was in his pyjamas and gown enjoying a cigar! He had greeted my father and had asked, “Mr Jayaweera, what can we do for great friend Madam Bandaranaike?. My father conveyed the message from Colombo and quietly mentioned that there would be riots in the country if there is no rice!

ZB had immediately got the Food Commissioner of Pakistan on the line and said, “I want a shipload of rice to be in Colombo within the next 72 hours!” The Food Commissioner reverted within a few minutes, saying that nothing was available and the last export shipment had left the port only a few hours ago to another country. ZB had instructed to turn the ship around and send it to Colombo. This despite protests from the Food Commissioner about terms and conditions of the Letter of Credit prohibiting non-delivery. Sri Lanka got its delivery of rice!

The next was the visit of Mrs B to Pakistan. On arrival in Rawalpindi airport, she was given a hero’s welcome, which Pakistan had previously only offered to President Gaddafi of Libya, who financially backed Pakistan with his oil money. That day, I missed school and accompanied my parents to the airport. On our way, we witnessed thousands of people had gathered by the roadside to welcome Mrs B.

When we walked to the airport’s tarmac, thousands of people were standing in temporary stands waving Sri Lanka and Pakistan flags and chanting “Sri Lanka Pakistan Zindabad.” The noise emanating from the crowd was as loud and passionate as the cheering that the Pakistani cricket team received during a test match. It was electric!

I believe she was only the second head of state given the privilege of addressing both assemblies of Parliament. The other being Gaddafi. There was genuine affection from Mrs B amongst the people of Pakistan.

I always remember the indefatigable efforts of Mr Abdul Haffez Kardar, a cabinet minister and the President of the Pakistan Cricket Board. From around 1973 onwards, he passionately championed Sri Lanka’s cause to be admitted as a full member of the International Cricket Council (ICC) and granted test status. Every year, he would propose at the ICC’s annual meeting, but England and Australia’s veto kept us out until 1981.

I always felt that our Cricket Board made a mistake by not inviting Pakistan to play our inaugural test match. We should have appreciated Mr Kardar and Pakistan’s efforts. In 1974 the Pakistan board invited our team for a tour involving three test matches and a few first-class games. Most of those who played in our first test match was part of that tour, and no doubt gained significant exposure playing against a highly talented Pakistani team.

Several Pakistani greats were part of the Pakistan and India team that played a match soon after the Central Bank bomb in Colombo to prove that it was safe to play cricket in Colombo. It was a magnificent gesture by both Pakistan and India. Our greatest cricket triumph was in Pakistan when we won the World Cup in 1996. I am sure the players and those who watched the match on TV will remember the passionate support our team received that night from the Pakistani crowd. It was like playing at home!

I also recall reading about how the Pakistani government air freighted several Multi Barrell artillery guns and ammunition to Sri Lanka when the A rmy camp in Jaffna was under severe threat from the LTTE. This was even more important than the shipload of rice that ZB sent. This was crucial as most other countries refused to sell arms to our country during the war.

Time and again, Pakistan has steadfastly supported our country’s cause at the UNHCR. No doubt this year, too, their diplomats will work tirelessly to assist our country.

We extend a warm welcome to Mr Imran Khan, the Prime Minister of Pakistan. He is a truly inspirational individual who was undoubtedly an excellent cricketer. Since retirement from cricket, he has decided to get involved in politics, and after several years of patiently building up his support base, he won the last parliamentary elections. I hope that just as much as he galvanized Sri Lankan cricketers, his political journey would act as a catalyst for people like Kumar Sangakkara and Mahela Jayawardene to get involved in politics. Cricket has been called a “gentleman’s game.” Whilst politics is far from it!.

Continue Reading

Features

Covid-19 health rules disregarded at entertainment venues?

Published

on

Believe me, seeing certain videos, on social media, depicting action, on the dance floor, at some of these entertainment venues, got me wondering whether this Coronavirus pandemic is REAL!

To those having a good time, at these particular venues, and, I guess, the management, as well, what the world is experiencing now doesn’t seem to be their concerned.

Obviously, such irresponsible behaviour could create more problems for those who are battling to halt the spread of Covid-19, and the new viriant of Covid, in our part of the world.

The videos, on display, on social media, show certain venues, packed to capacity – with hardly anyone wearing a mask, and social distancing…only a dream..

How can one think of social distancing while gyrating, on a dance floor, that is over crowded!

If this trend continues, it wouldn’t be a surprise if Coronavirus makes its presence felt…at such venues.

And, then, what happens to the entertainment scene, and those involved in this field, especially the musicians? No work, whatsoever!

Lots of countries have closed nightclubs, and venues, where people gather, in order to curtail the spread of this deadly virus that has already claimed the lives of thousands.

Thailand did it and the country is still having lots of restrictions, where entertainment is concerned, and that is probably the reason why Thailand has been able to control the spread of the Coronavirus.

With a population of over 69 million, they have had (so far), a little over 25,000 cases, and 83 deaths, while we, with a population of around 21 million, have over 80,000 cases, and more than 450 deaths.

I’m not saying we should do away with entertainment – totally – but we need to follow a format, connected with the ‘new normal,’ where masks and social distancing are mandatory requirements at these venues. And, dancing, I believe, should be banned, at least temporarily, as one can’t maintain the required social distance, while on the dance floor, especially after drinks.

Police spokesman DIG Ajith Rohana keeps emphasising, on TV, radio, and in the newspapers, the need to adhere to the health regulations, now in force, and that those who fail to do so would be penalised.

He has also stated that plainclothes officers would move around to apprehend such offenders.

Perhaps, he should instruct his officers to pay surprise visits to some of these entertainment venues.

He would certainly have more than a bus load of offenders to be whisked off for PCR/Rapid Antigen tests!

I need to quote what Dr. H.T. Wickremasinghe said in his article, published in The Island of Tuesday, February 16th, 2021:

“…let me conclude, while emphasising the need to continue our general public health measures, such as wearing masks, social distancing, and avoiding crowded gatherings, to reduce the risk of contact with an infected person.

“There is no science to beat common sense.”

But…do some of our folks have this thing called COMMON SENSE!

Continue Reading