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Sri Lanka’s gas tragedy: the untold story

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By Deshai Botheju, Ph.D.
M.Sc.Tech.(Norway), M.Sc., B.Sc.Eng. (1st Hons., UoM), AIChE, AMIE(SL)
deshaibotheju@acses.org

Recent explosions and gas leak accidents related to domestic LP gas cylinders have created an environment of fear, anxiety, and social unrest throughout the country. More than 400 explosions and gas leak incidents have been reported during the first week of December 2021. In addition, a large number of observations have been made with respect to leaking gas cylinder valves.

The reported accidents and incidents can be divided into four major categories: (a) Sudden gas explosions inside houses and building, (b) Sudden explosions associated with the gas cooker, (c) Major gas leaks and resulting damages associated with the regulator and the hoses, (d) Minor gas leaks from the cylinder valve, regulator, or the hoses. The number of accidents reported during a single week has far exceeded the typical gas-related accidents happening within a typical year. Something must have gone terribly wrong for Sri Lankan LP gas consumers. Unconfirmed reports now indicate potential deaths, associated with some of these gas explosion accidents.

What is LPG?

Liquefied Petroleum Gas, abbreviated LPG, is an energy carrier derived during crude oil refining or natural gas processing. In petroleum industry terminology these are called gas condensates and are byproducts often generated during the production of liquid fuels (gasoline, diesel, and kerosene) or natural gas (methane). The key components of typical LP gas are propane (an alkane gas containing three carbon atoms – C3H8) and butane (an alkane gas containing four carbon atoms – C4H10). In addition, small amounts of propylene, methane, pentane and other minor constituents can be present. LP gases do not originally have a clearly recognizable distinct odour. Therefore, in order to identify any gas leaks, methyl mercaptan (CH3SH), or a similar odour generating component, is added to LP gas before commercial use. Table 1 provides a useful comparison between propane and butane, with respect to key physical or chemical properties.

Depending on the refinery process, or intended use, LP gas can have a widely varying propane and butane composition. Under normal atmospheric pressure, butane has a higher boiling point of minus 0.5 degrees Celsius (-0.5) compared to propane’s minus 42 degrees Celsius (-42) boiling point. That means in colder climates, where the ambient temperature could go below 0 degrees Celsius, the LP gas must mostly contain propane in order to use that as a fuel gas (otherwise it wouldn’t flow as a gas, as butane would remain in the cylinder as a liquid). Therefore, the butane content is greatly reduced in LP gas used in colder climate countries, typically less than five percent of the volume. For tropical countries, like Sri Lanka, having a high butane content is just fine, as the year-round temperature is almost always above zero degrees Celsius (except for some rare occasions in locations at higher altitudes). Further, butane is a much safer gas to use. This is due to its much lower vapour pressure (31 pound per square inch) compared to that of propane (124.5 psi). Therefore, the containment integrity requirements shall be much stricter for propane use, compared to butane. (figure I)

Composition changes and pressure effects

Unlike compressed gas cylinders, LP gas cylinders are not filled with 100 percent gas. Instead, a new cylinder would contain the liquids, hence the name LP gas, to about 85 percent volume. Only the remaining 15 percent ullage volume (the volume left empty in a tank for the liquid to expand) contains actual gas. These two phases (liquid and gas) are in equilibrium. The pressure within this gas filled ullage is the equilibrium pressure of the corresponding liquid mixture (of propane and butane). This equilibrium pressure can be predicted based on the ambient temperature and the composition of the liquid phase. Table 2 provides the values of these equilibrium pressures (in pounds per square inch gauge or psig) for different propane-butane mixtures at the temperature of 32 degrees Celsius (which is quite close to the typical ambient temperature in Sri Lanka). (Figure II)

As can be seen from Table 2, at 32 oC temperature, a mixture of 80 percent butane and 20 percent propane has an equilibrium pressure of 53.6 psig. This was the composition used in Sri Lanka for a long time. All appliances (including gas cookers), pressure regulators, hoses, hose connectors, gas cylinder valves and cylinders have been accustomed to this pressure condition. In other words, our consumer gas utility system has been calibrated at this pressure condition. Nevertheless, gas cylinders themselves are manufactured to tolerate a much higher pressure.

If the butane-propane composition is suddenly changed to 50 % butane and 50 % propane, now the increased propane content leads to a much higher equilibrium pressure of 89.4 psig. It is obvious that this is a very significant pressure increase from the previous condition.

Containment integrity

Increased propane content leads to a significant increase in gas pressure inside the cylinder. This is because propane has a much higher equilibrium vapour pressure compared to butane (see Table 1). Now, the whole utility system on the part of the customers faces a containment integrity problem. In other words, gas leaks are likely to happen from many of the system components. Table 3 elaborates potential impacts of this pressure increase on different system components. Figure 1 further illustrates potential leak sources and pathways associated with the gas cylinder valve. (Figures III and IV)

What happens during a gas leak?

Propane and butane are flammable and combustible gases, when mixed with air (or oxygen). Within the approximate volume percentages of 2 to 10 percent (within LEL- Lower explosive limit and UEL – Upper explosive limit), these gases can create an explosive gas mixture when exposed to air; see Table 1. Outside of this volume percentage range, the gas would not ignite. However, at higher gas concentrations, the gas cloud can still pose an asphyxiation hazard to humans as it displaces breathable oxygen in air.

Even a minor gas leak in the cylinder valve, regulator, or any other component (see Table 3 and Figure 1) can lead to the accumulation of the gas inside a building, over several hours. Note that both propane and butane gases are higher in density compared to air (heavier than air; see specific gravity values shown in Table 1). Which means, when a gas leak occurs the explosive gas cloud accumulates close to ground level (rather than moving upward and dissipating). This situation is more likely to occur at night when doors and windows are closed, with consequently little or no ventilation. If the leaked cloud of gas reaches the concentration of LEL within that surrounding (for example a kitchen), then it is a bomb waiting to be triggered at any time. The only thing required is a small spark, which may occur when an electrical switch makes contact (on or off), or even due to static electricity present in the atmosphere, or due to an actual flame such as lighting a match. At that moment, an explosive combustion reaction occurs within the flammable gas cloud and the energy released is transmitted as a pressure wave accompanied often by a fireball. This is a typical atmospheric gas cloud explosion. Secondary damage can occur due to projectiles (broken glass for example), prolonged fires, collapsing roofs and walls.

Change management failure

Changing an existing LP gas composition without a detailed safety assessment is an act of sheer negligence bordering on absurdity. It’s a fundamental process engineering principle to follow a comprehensive Management of Change (MoC) protocol before making this kind of, or even far less consequential, change to a product, process, or an operating procedure. Even a Process Engineering Trainee can explain this to production management. As part of an MoC process, it is absolutely necessary to conduct a dedicated risk assessment or a standard safety study such as ‘HAZards and Operability’ (HAZOP). Had such HAZOP been conducted in this case, many of the problems we have indicated in Table 3 could have been identified in advance, avoiding calamity in consequence.

Cost factor and energy contents

The heat energy contents of propane and butane are respectively 49.58 and 47.39 megajoules per kilogram (MJ/kg). However, the density of liquid propane and butane are 0.51 and 0.58 kilograms per litre (kg/L) respectively. That means due to the lower density of propane compared to butane, propane has a slightly lower energy content when based on volume (25.3 and 27.5 MJ/L respectively). Propane burns with a slightly higher flame temperature compared to butane (1980 vs 1970 oC). In certain gas burners, propane could burn with slightly higher efficiency compared to butane (with less deposition of carbon).

If calculated based on the heat energy content delivered (measured by BTU-British Thermal Units), propane is often a cheaper energy commodity compared to butane in the world energy market. Therefore, an LP gas mixture rich in propane can be cheaper. LP gases with more propane are also easier to procure. While per BTU price is cheaper, if calculated based on metric ton price, one can be misled to believe that propane is more expensive than butane. This becomes a false assumption if all gas pricing and market economics are based on the value of BTUs (energy) delivered to the customer (customer is made to pay for the heat energy content delivered to them, and not for the weight of the gas). Also note that the exact price of a certain LPG shipment can be very different from the typical spot prices prevailing in the world energy market.

Safety culture issue

Every organisation has a certain safety culture. Without going into detailed academic definitions of the safety culture concept, we can still try to understand different characteristics of good (positive) safety cultures in comparison to bad (negative) safety cultures.

In a good safety culture Management of Change protocols are always followed; when an accident or an incident occurs, it will always be investigated to the fullest extent and all lessons to be earned are extracted; transparency and honesty are always maintained; instead of finger pointing, their own faults are admitted; no attempts are made at concealing information; safety is always given priority over marginal economic gains. In contrast, the complete opposite of these is to be expected of an organisation with a negative safety culture.

Investigation and compensation

Any investigation into the recent series of unfortunate gas related accidents in Sri Lanka must not stop at merely identifying plausible physical causes. Such investigation must definitely look deeper into related organisational factors, and make necessary recommendations to bring about much needed organisational reforms in the form of enhancing safety culture. In addition, more systematic safety management requirements and stricter regulatory reforms must be recommended to avoid repetition of this kind of ‘organizationally rooted accidents’. Failing to do so may lead to greater disasters of higher magnitude in future. Prompt compensation to those who faced harm must be a priority. Even more urgent is to recall every single gas cylinder delivered with hazardous pressure conditions, irrespective of whether the gas has been used or not. As explained before, LP gas cylinders will retain the same high pressure condition until the last drop of liquid is vaporised. Therefore, unused as well as almost fully used gas cylinders will pose the same level of leaking hazard.

(Facts presented in this article are based on information available on the public domain. The analyses and opinions are based on the author’s experience in the industry, and do not reflect the opinions of any institution.)



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Features

Polarizing rhetoric greets America on its epochal anniversary

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President Donald Trump addresses the public on the occasion of the US celebrating the 250th anniversary of the US Declaration of Independence from Britain.(BBC)

Democratic and progressive opinion in the US and the world over would likely have been further jolted by the divisive rhetoric blared forth by US President Donald Trump on no less an occasion than the 250th anniversary of the US Declaration of Independence from Britain. The world has been placed on notice that what it would be having in the main is aggravated polarization on multiple fronts during what’s left of the Trump tenure.

If the world was expecting positive moves by the Trump administration to bridge divisions, heal rifts and usher in a more harmonious international political order, this is very unlikely to be. Instead, in all probability we would be left with a far more ‘dangerous place to live in’.

Some of the more thought-provoking recent ‘takes’ from President Trump are : ‘A generation after we fought and won the cold war against the menace of communism, there is now a resurgence of the communist menace in our land, including from newcomers to our country who embrace ideas totally opposed to our way of life and our great success.’ ‘We will send them (immigrants) quickly away, and we will continue to build our country bigger and better than ever before.’ ‘We are going to give our country its identity back.’ ‘You can be loyal to Karl Marx or you can be loyal to America. You can be a communist or you can be a patriot. You cannot be both.’

Accordingly, what the world would have in increasing measure going forward are stepped-up attempts to consolidate a white supremacist administration in the US accompanied by a suppression of ethnic, religious and cultural minorities at home along with renewed attempts to spread and consolidate US hegemonism world wide.

The latter project would mainly translate into US military interventions abroad of the Venezuelan type and a persistence if not a resurgence of identity based conflicts globally. Violent reactions internationally to what are seen as attempts by the US to bring recalcitrant sections in particularly the South under white supremacist control will provide the basis for the steadfast presence and spiking of identity politics globally.

Moreover, the path has been paved for stepped-up ethnic, religious and cultural disharmony within the US. A united state is far from possible, given this backdrop. Put simply, it would be a question of steeper political polarization at home and abroad.

The persistent, widespread support for the hard line Islamic regime in Iran locally and globally should serve as an eye-opener for the political decision-makers of the US. Huge crowds at the funerals of Iran’s political leaders could very well be state-orchestrated but they are a pointer to the fact that political Islam is far from on the decline. To the extent to which this is so, the phenomenon could be a hurdle in the path of a stridently expansionist US.

Looking back, it was the consolidation of the Islamic regime in Iran in the late seventies of the last century that, besides proving a major challenge to the unfettered global power expansion of the US and its Western allies, provided the motive force as it were for the proliferation of Islam-based identity politics in particularly the South. This continues to be so.

Going forward, the US would need to figure out how best it could manage the persistent presence of Islamic fundamentalism world wide, and for that matter other forms of identity politics, without drastically losing its global power and influence.

The recent successful challenge by Iran to the US’ efforts to exercise its diktat in West Asia should prove an ‘eye-opener’. In these confrontations both sides were bloodied but Iran proved that it could successfully take on the US militarily. The inference for the US ought to be that projecting its military might in the Middle East in a no-holds-barred fashion would not prove easy.

Arising from the foregoing a foremost policy challenge for the US would be to curb Iranian military power while avoiding another major military confrontation with the Islamic state that would cost the US and the world dearly in particularly economic and material terms. The US would have no choice but to persist with the often flagging West Asian peace effort and to render it fully workable.

Ukraine presents the US with another formidable challenge. As is known, Ukraine is proving no easy ‘push-over’ for Russia, but it is badly in need of more sophisticated Western arms, particularly effective air defense systems, to fully neutralize the Russian invasion. What would the US choose to do; go to Ukraine’s assistance fully or opt not to ruffle and antagonize the Putin regime, with which it is on some cordial terms?

A negotiated solution is best in Ukraine and the Trump administration would do well not to lose sight of this ideal but Russia too should see the need for a diplomatic solution if it is to salvage itself from its military stalemate in Ukraine. The US needs to try being a peace mediator in the latter theatre but if the Russian political leadership fails to opt for peace the US would have no choice but to join the rest of NATO and Europe in continuing to arm Ukraine.

The US would need to take the latter course if the ‘world’s mightiest democracy’ is to remain committed to its founding ideals. If President Trump fails to meet this challenge he would prove that he is nothing more than an ‘empty rhetorician’.

However, it should not come as a surprise to the world if Trump chooses not to strongly back the rest of the West on Ukraine. Domestic and foreign policy are closely intertwined. Since the Trump administration is committed to building a white supremacist state at home, democratic development worldwide has been of the least importance to it.

The Trump administration’s strong affinities to white jingoism would increasingly compel it to opt for a policy of international isolationism. As a result Ukraine could prove unimportant for the US going forward.

Consequently, US-Western Europe friction in particular is only likely to intensify in the days ahead. Coupled with the contentious issues growing out of the persistence of identity politics, the Trump administration’s far-sightedness in managing foreign policy issues would be tested to the fullest. Whether the world would have comparative peace or continued blood-letting would depend crucially on such judiciousness.

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Beyond concrete: Sunela Jayewardene urges Sri Lanka to rediscover an ancient wisdom for a planet in peril

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Sunela / Rishan / Spencer

It was more than a lecture on architecture. It was a challenge to rethink civilisation itself.

Standing before a packed audience at Dilmah by Genesis in Maligawatte, internationally acclaimed environmental architect, author and conservationist Sunela Jayewardene delivered a keynote that transcended blueprints, buildings and urban planning.

Instead, she invited her listeners on an intellectual journey into Sri Lanka’s ancient past, arguing that the answers to some of the world’s gravest environmental crises may already exist within the island’s forgotten ecological wisdom.

Her address, titled “Beyond Concrete: Architecture for the Coexistence of Species,” was at once philosophical, historical and deeply practical. It questioned humanity’s obsession with dominating nature and called for a return to a design ethic rooted in respect, restraint and coexistence.

“The road is actually very simple,” Jayewardene said. “We have simply forgotten it.”

That observation became the defining thread of an afternoon that challenged conventional thinking about architecture and development.

According to Jayewardene, modern society has inherited a worldview shaped largely by colonial values that placed human needs above those of every other living organism.

“Our value system was turned on its head,” she observed. “We accepted a Western way of looking at nature without questioning it. Today we can clearly see the consequences. The world is in crisis. Species are in crisis. Our lifestyles are in crisis.”

She was careful not to romanticise the past, nor was she dismissive of modern science. Instead, she argued that Sri Lanka’s pre-colonial civilisation possessed a sophisticated environmental philosophy that modern planners and architects have largely ignored.

For Jayewardene, environmental architecture is not about fashionable sustainability slogans or cosmetic landscaping.

It begins with humility.

It begins by recognising that humans are only one species among millions sharing the same landscape.

“The built environment should not exist in opposition to nature,” she said. “It should become part of nature.”

One of the most captivating moments of her presentation came when she introduced her own research into the island’s ancient sacred geography.

Using digital mapping and satellite imagery, Jayewardene demonstrated the remarkable alignment of Sri Lanka’s four original Saman Devalayas, whose axes converge on Sri Pada, historically known as Samanthakuta.

The extraordinary precision of these alignments, she argued, raises profound questions about the scientific and surveying capabilities of ancient Sri Lankan civilisation.

“What kind of technology enabled them to achieve this?” she asked the audience.

Her purpose was not to offer speculative answers but to challenge deeply ingrained assumptions that ancient societies lacked scientific sophistication.

“We often underestimate what our ancestors knew,” she said. “Yet the evidence around us tells a very different story.”

That forgotten knowledge, she argued, extended well beyond engineering.

It shaped an entire philosophy of living with the landscape rather than imposing human will upon it.

Displaying photographs from archaeological sites including Ritigala, ancient monasteries and rock pavilions hidden within Sri Lanka’s forests, Jayewardene illustrated how builders carved steps around natural boulders, integrated structures into existing rock formations and preserved the contours of the land.

Modern construction, she suggested, would almost certainly have bulldozed those landscapes into submission.

“Our ancestors honoured the land,” she said. “They accepted the landscape instead of trying to conquer it.”

For Jayewardene, that principle remains the foundation of every project she undertakes.

She described environmental architecture as an exercise in listening rather than commanding.

Every site, she explained, possesses its own identity, ecological history and natural rhythm.

The responsibility of the architect is to understand that identity before attempting to intervene.

“The land tells you what it wants to become,” she said.

Throughout the presentation, one word repeatedly surfaced—context.

Without understanding context, she argued, architecture becomes little more than sculpture.

Good design cannot be copied indiscriminately from one country to another or even from one district to another.

Climate differs.

Rainfall differs.

Vegetation differs.

Wildlife differs.

Culture differs.

Even the stories associated with landscapes differ.

All of these, Jayewardene insisted, must shape architecture.

“When I speak about inhabitants, I don’t mean only human beings,” she explained.

“The birds, insects, reptiles, mammals, trees and every living organism already occupying that land must become part of the design equation.”

This broader understanding forms the basis of what she describes as non-human-centred design—an approach that rejects the notion that cities exist exclusively for people.

Instead, landscapes should provide refuge for biodiversity while simultaneously serving human communities.

It is an idea that resonates strongly at a time when rapid urbanisation continues to erode habitats across Sri Lanka.

Jayewardene also challenged prevailing attitudes towards development itself.

Too often, she argued, “development” has become synonymous with replacing natural systems by concrete infrastructure.

She questioned whether flattening hillsides, redirecting streams and clearing vegetation can genuinely be described as progress.

In her view, genuine development should first ask what ecological value already exists before deciding what should be built.

One of the simplest yet most profound examples she offered concerned water.

“I always say it is acceptable to interrupt water,” she remarked. “But never disrupt it.”

That distinction reflects an ecological understanding often absent from conventional engineering.

Natural drainage systems, she warned, perform countless functions that remain invisible until they are damaged.

Floods, soil erosion, biodiversity decline and even changes in local climate frequently follow.

“We disrupt far more than water,” she said. “We disrupt entire ecological relationships.”

Equally significant was her distinction between degraded brownfield sites and relatively untouched greenfield landscapes.

Brownfield sites require ecological restoration, rehabilitation and renewal.

Greenfield sites demand restraint.

Minimal intervention, she argued, is often the highest form of environmental design.

The keynote found an appropriate setting within Dilmah Conservation’s own efforts to restore degraded urban landscapes.

Earlier in the programme, Rishan Sampath of Dilmah Conservation outlined the organisation’s transformation of an abandoned industrial property in Moratuwa into a flourishing urban forest containing over 300 tree species and more than 1,000 individual plants.

Scientific studies conducted within the restored forest have already demonstrated improvements in air quality compared with adjoining urban roads, providing measurable evidence that biodiversity restoration can improve city life.

For Jayewardene, such initiatives represent far more than beautification projects.

They demonstrate that ecological restoration can become a guiding philosophy for future urban planning.

Her address ultimately became a call to rethink humanity’s place within nature.

Architecture, she argued, should no longer celebrate domination over landscapes.

It should celebrate coexistence.

Every building should strengthen biodiversity.

Every development should restore ecological balance.

Every designer should ask not merely how a project serves people, but how it serves life itself.

As the audience left the hall, they carried with them more than architectural ideas.

They carried a challenge

To question inherited assumptions.

To rediscover indigenous ecological wisdom.

And to recognise that Sri Lanka’s greatest contribution to global sustainability may not lie in importing new environmental models, but in rediscovering the timeless principles embedded within its own civilisation.

For Sunela Jayewardene, the future will not be secured by building more impressive skylines.

It will be secured when humanity learns once again to build gently, intelligently and respectfully—allowing architecture to become not an act of conquest, but an expression of coexistence.

By Ifham Nizam

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Colombia’s “back-to-back queen”

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Beyond modelling, Colombia’s Katherine Castaño, who captured the crown at the Top Model of the World 2026, in Egypt, is also a TV host, entrepreneur and social media influencer.

She’s based in Miami, Florida right now — a hub for fashion and influencer work — a city she calls home base, while representing Colombia on the world stage.

Her Miami base gives her access to fashion, entertainment, and business networks, while her title keeps Colombia front and centre in the global modelling conversation.

Off the runway, she says she enjoys singing, playing the piano, and tennis.

Katherine didn’t make the trip to Egypt as a newcomer. She’s built a strong international portfolio before winning the crown.

In fact, her résumé reads like a fashion passport: Colombia Moda, New York Fashion Week, Miami Swim Week, Miami Fashion Week, Nicaragua Diseña, IXEL Moda, and Mercedes-Benz San José.

On June 8, 2026, Katherine Castaño was crowned by outgoing winner Natalia Garizabal Vera, also of Colombia. That gave Colombia a historic back-to-back victory — the first time any country has done it in the competition’s history, and Colombia’s 4th win overall.

As Top Model of the World 2026, Katherine’s reign is centred on elevating her profile as a model, influencer, and entrepreneur.

She’s built a personal brand around beauty, ambition, style, and professionalism, with strong reach across fashion, social media, and business.

As titleholder, she’s now the face of the pageant’s international fashion platform, representing Colombia globally, while based out of Miami.

Ahead of the competition she was clear about the stakes: “This is bigger than me. This is for my country. This is for the story I’m here to write… And I’m not going quietly… we’re going for that back to back.”

As the reigning titleholder, Katherine Castaño’s role extends far beyond the sash. She’s using the platform to grow her brand as a model, influencer, and entrepreneur rooted in “beauty, ambition, style, and professionalism”.

She will also be doing runway shows, photoshoots, brand appearances, and fashion events.

Sri Lanka’s representative at this pageant was NetalieWithanage.

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