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Sell’s Brent Alpha offshore platform arrives at Able UK port for dismantling

first_imgThe 17,000t Brent Alpha platform has been transported from the Brent field in North Sea to Able UK’s Teesside decommissioning yard The Brent Alpha platform has arrived at Able UK’s Teesside decommissioning yard. (Credit: Able UK Ltd) British industrial services firm Able UK has announced that the Shell’s Brent Alpha oil and gas platform has arrived at Able Seaton Port in the UK, in preparation for its dismantling and recycling.The 17,000 tonne Brent Alpha platform has been transported from the Brent oil and gas field in North Sea to Able UK’s Teesside decommissioning yard in North East England.Swiss-based offshore contractor Allseas’ Pioneering Spirit vessel has completed the removal of platform, located 186km off the northeast coast of the Shetland Islands.Brent Alpha is the third platform to be decommissioned from the Brent fieldThe Brent Alpha is the third of four platforms, after Delta and Bravo platforms, to be decommissioned from the Brent oil and gas field.Able UK founder and executive chairman Peter Stephenson said: “The Brent contract is just about the most prestigious oil and gas decommissioning project in the world.“As well as beginning work on the Brent Alpha, a further decommissioning contract will commence in July and from the middle of September, Able Seaton Port will be providing the installation base for the 90 Mitsubishi Vestas turbines that will comprise Innogy’s 857MW Triton Knoll offshore wind farm.”The Brent Alpha platform consisted of a topsides structure supported by a steel six-legged jacket standing in 140 m of water.One of the biggest fields in the UK North Sea, the Royal Dutch Shell-operated Brent field is currently being decommissioned due to plunging recoverable oil and gas reserves.The Brent field comprised four large platforms namely, Alpha, Delta, Charlie, and Bravo.last_img read more

The Mindfulness Backlash, and should it be pushed in NZ schools?

first_imgThe Mindfulness BacklashNew York Times 30 June 2014Mindfulness has reached such a level of hipness that it is now suggested as a cure for essentially every ailment. Anxious? Broke? Sneezing? Definitely try meditating.This vogue is in part due to the real benefits of mindfulness, a form of attention and awareness often (but not always) achieved through meditation or yoga. It’s a trend for a reason. But its increasing application to every situation under the sun has some people concerned.In The Atlantic, Tomas Rocha writes about the little-discussed possibility that, for some people, meditation could actually be dangerous. He talks to Dr. Willoughby Britton, a professor of psychiatry and human behavior who works with people who feel they’ve been harmed by meditation — one man described going through “psychological hell” as a result of his practice, while another worried he was “permanently ruined.” Dr. Britton has tracked “dark nights of the soul” — spiritual experiences that are frightening rather than calming — across a variety of religious texts, and she believes that meditation’s potential ill effects have been under-studied. Mr. Rocha writes:“Many people think of meditation only from the perspective of reducing stress and enhancing executive skills such as emotion regulation, attention, and so on.“For Britton, this widespread assumption — that meditation exists only for stress reduction and labor productivity, ‘because that’s what Americans value’ — narrows the scope of the scientific lens. When the time comes to develop hypotheses around the effects of meditation, the only acceptable — and fundable — research questions are the ones that promise to deliver the answers we want to hear.”http://op-talk.blogs.nytimes.com/2014/06/30/the-mindfulness-backlash/?_r=0Keep up with family issues in NZ. Receive our weekly emails direct to your Inbox.Mindfulness backlash: Could meditation be bad for your health?The Telegraph 24 October 2015Convinced by studies (such as that by Oxford University in 2014, which found the technique can reduce depression relapses by 44 per cent), the National Institute for Health and Care Excellence (NICE) now recommends mindfulness-based cognitive therapy for depression.The Mental Health Foundation estimates that 30 per cent of GPs refer patients with mental health issues for mindfulness-based treatment.Persuaded by claims of stress reduction and increased mental clarity, mindfulness has been eagerly adopted by huge companies including Google, Apple, Sony, Ikea and the Department of Health. Mindfulness-based anger management is offered to inmates in prison, and there are calls for mindfulness training to become mandatory in schools.“A good teacher will help you make sense of what emerges through meditation.”Dr Tamara Russell, founder of The Mindfulness Centre of Excellence. “Beneficial findings are overstated in some media reports, whereas studies without the expected results go under the radar. This leads to a skewed picture, wherein the enthusiasm may be ahead of the evidence. Currently, with mindfulness, the evidence is not necessarily consistent or conclusive.”  When Farias and Wikholm began researching The Buddha Pill, they were astonished at the paucity of solid studies on the benefits. Then their own research threw up surprising evidence that mindfulness has a range of outcomes – not all positive.“To some, this will be blissful relaxation, but for others the outcome will be emotional distress, hallucinations or perhaps even ending up in a psychiatric ward,” says Farias. “David Shapiro of the University of California, Irvine, found that seven per cent of people on meditation retreats experienced profoundly adverse effects, including panic and depression.”Psychologists Miguel Farias and Catherine Wikholm, co-authors of The Buddha Pill: Can Meditation Change You? “Mindfulness and meditation are bad for people. People should be thinking… Life is about going out there and meeting people and hearing their thoughts.”Oxford University professor Theodore Zeldinhttp://www.telegraph.co.uk/women/womens-life/11942320/Mindfulness-backlash-Meditation-bad-for-your-health.htmlThe Dark Knight of the SoulThe Atlantic 24 June 2014In late January this year, Time magazine featured a cover story on “the mindful revolution,” an account of the extent to which mindfulness meditation has diffused into the largest sectors of modern society. Used by “Silicon Valley entrepreneurs, Fortune 500 titans, Pentagon chiefs, and more,” mindfulness meditation is promoted as a means to help Americans work mindfully, eat mindfully, parent mindfully, teach mindfully, take standardized tests mindfully, spend money mindfully, and go to war mindfully. What the cover story did not address are what might be called the revolution’s “dirty laundry.”“We’re not being thorough or honest in our study of contemplative practice,” says Britton.http://www.theatlantic.com/health/archive/2014/06/the-dark-knight-of-the-souls/372766/FURTHER READING: Parental Rights in NZ Regarding “Mindfulness”https://www.familyfirst.org.nz/2014/10/parental-rights-regarding-mindfulness/last_img read more

Wasterwater release in Ainsworth prompts another reminder from DNR to flush only toilet paper

first_imgAINSWORTH —- The release of around 1,000 gallons of wastewater into a creek near Ainsworth this week is prompting another reminder about flushing the wrong things down your toilet.The DNR’s Brian Lee says a plugged sewer line was the cause of the problem. He says the contractor did confirm that flushable, wipes, kleenexes and other material had plugged the pipe. Lee says they continue to get calls about problems like this with sewer systems.“Just continue to remind people to only flush toilet paper…anything else can be discarded in the trash. There are other services out there that can help get rid of your trash as needed,” Lee says.Lee says the materials that aren’t supposed to be flushed can do several different types of damage. “Failures of electronic equipment. Pumps can burn up causing facilities to have to contact a contractor or get other people in there and fix it because they have other things that they need to do as far as operating the system normally otherwise,” he says.Lee says they don’t believe the wastewater that was released did any harm to the environment.last_img read more

Talented youngsters win South East Skills Final

first_img Rookie 9 to 11 yrs Rookie 9 to 11 yrs Name Ufford Park Golf Club Aylesbury Vale Golf Club Rookie 9 to 11 yrs Caiden Gant Aspley Guise & Woburn Sands Golf Club West Herts Golf Club Tour 15 to 17 yrs Cranfield Golf Centre Barnham Broom Golf & Country Club Tour 15 to 17 yrs Tour 12 to 14 yrs Saskia Jones Khadeejah Khan Ben Franklin Ivy Rose Neary Langdon Hills Golf Club Three Rivers Golf Club Harry Wood Rookie 8 yrs & under Tour 12 to 14 yrs Heather Kielty Rookie 8 yrs & under Maddy Simpson George Fricker 8 Aug 2014 Talented youngsters win South East Skills Final Rookie 8 yrs & under Milly Woad Fairlop Waters Golf Club Clare Wilkie Nicola Dalzell Aspley Guise & Woburn Sands Golf Club Ashley Chalmers Tour 15 to 17 yrs Rookie 9 to 11 yrs Chesfield Downs Golf & Country Club, in Hertfordshire, hosted 24 boys and girls for the England Golf South East Regional Skills Final, supported by FootJoy. The youngsters qualified for the event after competing in two National Skills Challenge events at their home clubs earlier in the year. The boy and girl winners from each age group will now attend the Skills Challenge National Final on Saturday 6th September, at the National Golf Centre in Woodhall Spa, Lincolnshire. They are: Rookie 8 years & under Jamie Burchell – Cranfield Golf Centre, Essex Saskia Jones – Farnham Golf Club, Surrey Rookie 9 to 11 years Harry Wood – Langdon Hills Golf Club, Essex Molly Dixon – Betchworth Park Golf Club, Surrey Tour 12 to 14 years Joe Platt – Aspley Guise & Woburn Sands Golf Club, Bedfordshire Maura Burns Zaragoza – Fairlop Waters Golf Club, Essex Tour 15 to 17 years Harvey Platt – Aspley Guise & Woburn Sands Golf Club, Bedfordshire Clare Wilkie – Aspley Guise & Woburn Sands Golf Club, Bedfordshire Russell Lawes, FootJoy Marketing Manager, commented: “Everyone at FootJoy would like to congratulate those players who have managed to progress through to the National Skills final and wish them every success. “We have once again been delighted to support all players who have entered the skills challenge at the varying regional events and wish all players every success with the development of their golf game. “There is a perfect synergy between the National Skills Challenge and FJ’s The Mark of a Player mantra, by teaching the next generation of golfers the key fundamentals which will enhance their enjoyment and understanding of the game of golf.” The England Golf National Skills Challenge, supported by FootJoy, has over 850 golf clubs and 6,500 juniors registered to take part.   The Skills Challenge aims to make practice fun for young golfers and consists of 10 activities, which clubs run for their junior players. These support skill development and also provide encouragement to practice.  Golf clubs which run Skills Challenge events within two specific dates input their players’ scores onto an online leaderboard, which identifies the juniors who qualify for the regional finals. The Regional Final at Chesfield Downs Golf & Country Club turned out to be a real challenge, using the superb practice area, putting green and driving range facilities.  For further details on Chesfield Downs Golf & Country Club and their facilities visit www.chesfielddownsgolf.co.uk. FootJoy, the #1 Shoe and Glove in Golf, supports England Golf’s National Skills Challenge and kindly supplies products and prizes to all players who qualify for the Regional and National Finals. For more information on the National Skills Challenge please click here. Please find below a list of all participating players from the South East Regional Skills Final. Fairlop Waters Golf Club Farnham Golf Club Ufford Park Golf Club Aspley Guise & Woburn Sands Golf Club Aspley Guise & Woburn Sands Golf Club Harvey Platt Maura Burns Zaragoza Rookie 9 to 11 yrs Molly Dixon Joe Platt JR Ellis Patrick Arundel Tour 12 to 14 yrs Rookie 9 to 11 yrs Rookie 8 yrs & under Tour 12 to 14 yrs Tour 12 to 14 yrs Tour 15 to 17 yrs Grace Fricker Boyce Hill Golf & Country Club Costessey Park Golf Club Rookie 8 yrs & under Tour 15 to 17 yrs Rookie 8 yrs & under Jamie Burchell Age Category Farnham Golf Club Joshua Robertson Golf Club Barnham Broom Golf & Country Club Tour 12 to 14 yrs Tour 15 to 17 yrs Ufford Park Golf Club Betchworth Park Golf Club Dylan Green Three Rivers Golf Club Will Bradfield Deangate Ridge Golf Club Boyce Hill Golf & Country Clublast_img read more

Cyclist killed by drunken cop in WCD accident

first_imgSixty-four-year-old cyclist Conrad Alleyne of Lot 33 Hague, West Coast Demerara was struck down on the Boerasirie Bridge by a vehicle being driven by a Police Superintendent attached to the ‘D’ Division (West Bank Demerara-East Bank Essequibo) on Wednesday at about 19:20h.Rushed to the Leonora Cottage Hospital, he was later transferred to the Georgetown Public Hospital (GPHC), where he succumbed to his injuries.Alleyne’s body is at the Ezekiel Funeral Home, awaiting a post-mortem examination.Police information revealed that the Superintendent, who was driving motorcar PTT 992 in an easterly direction along the northern side of the bridge, said he felt the vehicle had struck something, and upon inspection he saw the cyclist lying on the bridge with injuries about his body.However, a breathalyser test conducted on the Superintendent showed that he had consumed more than the legal limit of alcohol. He has since been taken into Police custody.Less than two weeks ago, Akemo Anthony Bristol of Lot 338 East Ruimveldt, Georgetown, a 23-year-old father of one, died following a collision on Mandela Avenue with a GPF vehicle being driven by a Police rank, who also was said to be under the influence of alcohol.Based on information received at that time, the Police Constable and Bristol were both proceeding along Mandela Avenue when the collision occurred. The impact reportedly flung Bristol into a nearby gutter, while his motorcycle ended up under the minibus.Extracted from the gutter with visible injuries about his body, Bristol was rushed to the GPHC, but succumbed to his injuries while receiving medical attention.last_img read more

How Sebastian Desabre got his groove back

first_imgDesabre made only one change to the team that drew 0-0 with Tanzanian last month Tags: 2019 AFCON QualifiersSebastian DesabretopUganda Cranes KAMPALA – A troublesome, resilient and plucky monkey was lifted off Sebastian Desabre’s back after the Cranes crushed Lesotho 3-0 to storm back to the top of Group L of the African Nations Cup qualifiers.Goals by man of the match Emmanuel Okwi and deputy skipper Farouk Miya propelled Uganda to seven points, three clear of Cape Verde, which a day earlier dismissed Tanzania with an identical scoreline.Victory over the miniature Southern African nation puts Cranes in command of their qualification destiny at the half way stage of the campaign, and, in the short run, assuages mounting on the Frenchman.Lingering question marks over Desabre’s suitability for the Cranes hot seat must go into abeyance as his team prepares for Tuesday’s reverse fixture in Maseru.Though the much travelled tactician made only one change from the team that failed to spark in drawing one-all with Tanzania’s Taifa Stars at Mandela National Stadium last month, a couple of tactical tweaks he made prior to, and during the game showed the former Ismaily coach’s marbles are firmly in his grasp.FC Ried front man Edrisa Lubega was an inspired selection to lead the front line, with his pace and power, more than compensating for his lack of panache. It was Lubega’s power which allowed him to brush aside the attention of two Lesotho defenders to set up Okwi for his second on 63 minutes.Despite Uganda’s fortified position, the Cranes must guard against complacency in Tuesday’s rubber as Lesotho’s Shirt 18 was a constant menace in midfield.Early in the second half, the diminutive playmaker who plays his trade with Black Leopards in South Africa’s Premier Soccer League was threatening to overrun Cranes’ midfield. Desabre deserves a pat on the shoulder for introducing Ibrahim Saddam Juma on 60 minutes.The KCCA FC midfield general helped plug holes that had been created by deploying Joseph Ocaya, who for all intents, is a wide man, as Cranes’ third midfielder.Since Uganda is ranked 62 places above Lesotho in FIFA rankings, anything other than an attacking approach in Maseru will be frowned upon by Cranes fans.Nevertheless, Desabre ought to take into account the fact that Lesotho are at home and held Cape Verde, who are ranked 16 places above Uganda to a 1-1 draw.Denis Iguma’s starring role in central defense where he did not set a foot wrong provides the coach with a selection dilemma. But Murushid Jjuuko’s return from suspension should allow for Iguma to move into a holding role in midfield.Comments last_img read more

Foster carers sought across Co Donegal

first_imgTusla-Child and Family Agency has launched a new public information campaign to recruit more foster carers across Donegal, and to dispel the myths around foster care eligibility.The campaign is Tusla’s first national fostering campaign and it aims to dispel misconceptions about who can foster a child, and encourage people from all walks of life to consider providing a loving stable environment for a vulnerable child.Tusla National Fostering Week, which takes place on October 14th-20th is being supported by the Irish Foster Care Association. Tusla National Fostering Week will include a range of public awareness events. Tusla Donegal will hold a fostering information evening on Wednesday 16th October at 7pm in Mount Errigal Hotel, Letterkenny, Co Donegal facilitated by Fostering Social Workers and Foster Carers. Those wishing to attend can contact 074 9123701 to register their interest.Speaking at the launch of Tusla National Fostering Week, Chief Executive of Tusla, Bernard Gloster, said: “Tusla National Fostering Week is an opportunity to dispel common misconceptions about foster care. We are looking for foster carers from all walks of life to provide loving, stable environments for children who, due to life experiences can’t live at home.“It only takes one person to change a child’s life. I would encourage anyone who feels they can provide a stable and safe family environment for a child to think about fostering and join the 4,254 Tusla foster carers around the country that open their homes to 5,521 children.”Across Donegal, 144 foster carers open their home to 208 children.  Gerry Hone, Area Manager, Tusla said foster carers make a huge contribution to local communities by caring for children and supporting them in participating in schools, sports clubs and other activities.He said “There is a critical need to have a diverse range of foster carers available who can meet the individual needs of each child. The child’s needs are identified from listening to the views of the child, their parents and families and from other professionals who know the child.“There are many myths of who can and can’t foster but every child is different and their needs for foster care can be in an emergency, for respite, short term or long term. Anyone who has thought about fostering can come along to one of our events or contact us so we can discuss any queries they have.”People in Donegal who would like to find out more about fostering can call 1800 226 771, email [email protected] or visit Tusla.ie for more details.Foster carers sought across Co Donegal was last modified: October 5th, 2019 by StephenShare this:Click to share on Facebook (Opens in new window)Click to share on Twitter (Opens in new window)Click to share on LinkedIn (Opens in new window)Click to share on Reddit (Opens in new window)Click to share on Pocket (Opens in new window)Click to share on Telegram (Opens in new window)Click to share on WhatsApp (Opens in new window)Click to share on Skype (Opens in new window)Click to print (Opens in new window) Tags:donegalfamiliesfosterTUSLAlast_img read more

Man drowned on camping trip but questions remain, inquest hears

first_imgThe coroner for Co Donegal has returned an open verdict on the death of a Derry man who drowned on a camping trip to the Isle of Doagh.The inquest into the death of Anthony Griffiths (59), from Culmore, heard how he and his wife Leonie and a number of other family members visited the Isle of Doagh in Inishowen on August 29, 2016. Yesterday Mrs Griffiths told a court sitting in Buncrana that when the family arrived they pitched their tents and had a barbecue.The Belfast Telegraph reports how he urged her husband to have something to eat because he had drunk a bottle of wine.After playing cards, the couple went for a walk along the shore, with Mr Griffiths admiring the stars in the sky.When they returned, he told his wife that he wanted to sleep outside and would later move to his car.Mrs Griffiths emerged from her tent at approximately 9.30am the following day and went to find her husband.While she was unable to locate him, she assumed he had gone to the beach and was not initially concerned for his safety.After further attempts to find him proved unsuccessful, Mrs Griffiths began to feel that something was wrong.At 3pm she reported her husband missing to gardai in Carndonagh.The authorities subsequently launched a two-day search for the missing man, involving the police, coastguard and members of the public.The operation came to an end on September 1, when Mr Griffiths’ body was discovered on rocks by the crew of the coastguard helicopter.For full report see https://www.belfasttelegraph.co.uk/news/northern-ireland/coroner-cant-explain-drowning-death-of-camper-anthony-griffiths-in-donegal-38625764.htmlMan drowned on camping trip but questions remain, inquest hears was last modified: October 24th, 2019 by StephenShare this:Click to share on Facebook (Opens in new window)Click to share on Twitter (Opens in new window)Click to share on LinkedIn (Opens in new window)Click to share on Reddit (Opens in new window)Click to share on Pocket (Opens in new window)Click to share on Telegram (Opens in new window)Click to share on WhatsApp (Opens in new window)Click to share on Skype (Opens in new window)Click to print (Opens in new window) Tags:donegaldrowningIsle of Doaghlast_img read more

Brand South Africa calls for a single national narrative

first_imgAt a workshop held in Johannesburg this week, Brand South Africa urged stakeholders and provinces to align themselves with its brand so that the nation would have one story, well told. Sithembile Ntombela of Brand South Africa said they are busy developing a Country Messaging Framework so that South Africans in all provinces could tell the same message when doing nation branding. (Image: Priya Pitamber) Melissa JavanProvinces should align themselves with Brand South Africa‘s message when it came to nation branding, said Sithembile Ntombela, the acting chief marketing officer of the country’s international marketing agency.Ntombela hosted a nation brand masterclass for several stakeholders during a workshop at the Gauteng Investment Centre in Sandton, Johannesburg, on 19 August. They were introduced to two of Brand South Africa’s programmes, namely the Nation Brand Master Class and the South African Competitiveness Forum.The former seeks to train and equip marketers and communicators with the necessary skills to profile the South African nation brand. The latter is a platform on which the agency seeks to find ways to improve the country’s competitiveness.Ntombela said she had visited various provinces’ stalls at the Tourism Indaba in May, and found that the brand information of several was full of jargon. She said this made her feel a disconnection with the nation brand. Brand South Africa is therefore developing a Country Messaging Framework to address this matter. The framework was still being developed and stakeholder input was needed.Elements of nation branding included people, tourism, governance, investment, culture and heritage.Provinces should not do their own thing, Ntombela said, especially when it came to tourism. “The dress-up of South Africa is important. It is how we carry ourselves as custodians. The storytelling aspect is the driver behind what you accomplish.“We have to sell the basics right, know what our values [our esteem] as South Africans are.”She said brand alignment was about messaging, adding that all messages represent where South Africa came from and what it represented. “But we tend to contradict ourselves.”Brand South Africa’s messaging would be aligned with the National Development Plan.The focus of Ntombela’s masterclass was that South Africans should have “one story, well told” when doing nation branding. In meeting this, she recommended that provinces should align with the Brand South Africa brand identity.Nation branding was important because of a country’s identity, purpose and national pride. “We want to attract tourists and stimulate investments.”The question that should be asked of South Africans, she stressed, was what they were doing in their province to stimulate this.last_img read more

The Science of Air Flow in Flex Duct

first_imgThe variables they looked at were:Compression of flex duct – How long was the duct compared to its maximum stretch? They looked at 5 variations here: maximum stretch and compressions of 4%, 15%, 30%, and 45%. Note that compression in this use refers to the degree that the duct wasn’t stretched out to its full length. It has nothing to do with being squeezed around the middle.Support – They supported the flex duct in two ways. Either it was completely supported on a board, or it was supported on 1.5 inch wide joists that were 24 inches on center. The board-supported duct had only compression. The joist-supported duct had both compression and sag.Sag – With joist-supported duct, they looked at natural sag and long-term sag. The difference between the two is that long-term sag represents and extreme case.Duct size – They used 6-inch, 8-inch, and 10-inch diameter round ducts.The table (Image #3, below) shows the amount of sag for the different compression percentages and duct sizes. Note the highlighted cells. They point to the sag for the 6-inch duct, which is the size I’m going to focus on in this article. At low compression, the natural and long-term sag are the same. When you get up to 30% sag, though, they begin to diverge. At 45% compression, the 6-inch duct has 7 inches of natural sag and 11.5 inches of long-term sag.What they foundThe researchers looked at the static pressure in inches of water column (i.w.c.) versus air flow in cubic feet per minute (cfm). They compared what happens in various states of compression for flex duct to what happens in rigid metal duct. Each graph below (Images #4 through #8) is for a different compression, beginning with a perfect installation that has no compression.Also, each graph suffers from the tendency of academics to make things too complicated. They show as many as 12 curves on one graph. Ughh! I didn’t have time to replot the data and make them easier to understand, so I’m going to direct your attention to the data for the 6-inch ducts only. They’re the ones with the circles for data points. Just ignore all the triangles and squares.0% Compression. What you see in the first graph is that there’s essentially no difference between perfectly installed flex duct and rigid metal duct. The curves for the two types overlap almost perfectly when you pull the inner liner of flex duct tight.4% Compression. The second graph shows what happens when you leave just a little bit of slack in the inner liner of the flex duct. It’s just 4%, but notice the big difference between the flex and the rigid metal duct here. The joist- and board-supported flex overlap each other but are both significantly higher than the rigid metal duct.Looking at the 6″ duct data (the circles), find where each curve crosses the 0.1 i.w.c. static pressure line. If you read the air flow for each, you’ll see that the 4% compressed flex is moving about 70 cfm, whereas the rigid metal duct is moving about 110 cfm. Wow! That’s a huge difference and we’re only at 4% compression!What this analysis shows is that the lower the curve on this graph, the better. The higher it is, the worse it is.15% Compression. The performance of flex duct at 15% compression is significantly worse than sheet metal and also worse than flex at 4% compression. We can tell it’s gotten worse than at 4% compression because the scale of static pressure has increased. At 0% compression, the maximum static pressure was 0.225 i.w.c. At 4% compression, it rose to 0.8 i.w.c. Here at 15% compression, the static pressure scale goes all the way up to 3 i.w.c.In addition, we see a new pattern developing. Now we see a difference between joist-supported and board-supported flex. You know which one is worse without even looking, right? (Recall from the last graph that the higher the curve, the worse it is.)Another way to look at this is to notice that to keep the 70 cfm we had at 0.1 i.w.c. with 4% compression, we now have to have 0.25-0.5 i.w.c., depending on whether the flex is board- or joist-supported. Higher pressure means more fan power, which means more energy use.30% Compression. Again, we see a big drop in performance. The curves move up. The maximum on the pressure scale this time is 7 i.w.c. To maintain 70 cfm in flex with this level of compression, we need 0.5-1.0 i.w.c. That is, more fan power and more energy use.Also, they’ve plotted the other type of joist-supported data, those for long-term sag (i.e., worst case). Natural and long-term sag aren’t so different at 30% compression, though. Hmmm. I wonder what the 45% data will show?45% Compression. Surprise! Surprise! Well, OK. There’s no surprise here. Everything again is much worse. The scale now goes up to 9 i.w.c. The flex with long-term sag is significantly worse than the flex with natural sag, which is worse than board-supported flex.And to get 70 cfm of air flow in the ducts, we need nearly 1 to nearly 2 i.w.c. of pressure.The big takeawaysActually, that’s a pretty good title for this section. The big takeaways are that flex duct not pulled tight takes away a lot of air flow if you have a fixed-speed blower or it takes away a lot of your money if you have a blower that tries to maintain the flow no matter what it does to the pressure.Also, apparently these data were the subject of a lot of debate on the Manual D committee. According to David Butler:“When the latest (3rd) edition of Manual D was in development, there was a lot of discussion about friction rates of poorly installed flex. Texas A&M, having studied this, provided data from its research for inclusion in the manual, the idea being to give designers an idea of real-world friction rates, and hopefully persuade diligent contractors to follow recommended installation practice.”He wrote that in a comment in my earlier article about how to install flex duct properly. In that article I posted a related diagram from the Air Diffusion Council’s installation manual for flex duct. It showed that when flex duct has 15% compression, you should double the friction rate. When it has 30% compression, you should quadruple the friction rate. (They don’t discuss 45% compression.)If you look at these data from the Texas A&M study, you can see that the doubling and quadrupling are actually a bit optimistic. For joist-supported flex at 30% compression, for example, it’s more like a factor of 10, not 4.Of course, you could use the data from this study to aid your design, and they do show all this now in Appendix 17 of Manual D. To design for proper air flow with improperly installed ducts would be downright stupid, though. If you can’t install it properly, use rigid metal duct.Is flex duct worth the effort?In my opinion, flex duct is just fine as long as you don’t abuse it. Pull it tight. Use it mainly for straight runs. Occasionally, you may find a place where you can make a long, gentle turn, and that can be OK. The analysis done by the Texas A&M researchers, however, applied only to straight runs of flex duct. It doesn’t apply to the extra turbulence you get when you make a mess of turning the air. If you do really stupid stuff, like put a sharp kink in it (as shown in Image #9, below), that only adds to the problems of the liner not being pulled tight.The problem is that most flex duct is installed horribly. The two photos I’ve included in this article are a tiny part of my collection. (Be sure to check out my new favorite duct disaster!) But installers get away with it by oversizing the heating and air conditioning systems so the bigger blower might have a chance of making the house reasonably comfortable.There you have it. Flex duct can work, or it can go horribly wrong. Now, you bring the Guinness, I’ll bring the Jameson and the Bailey’s, and we can start discussing the deeper issues like double-stud walls versus exterior insulated walls, the proper metric for measuring the airtightness of Passive Houses, and whether or not Joe Lstiburek can stand on his head, drink a beer, and sing O Canada all at the same time. And after a couple or five Irish Car Bombs, we may all be standing on our heads. Allison Bailes of Decatur, Georgia, is a speaker, writer, energy consultant, RESNET-certified trainer, and the author of the Energy Vanguard Blog. Check out his in-depth course, Mastering Building Science at Heatspring Learning Institute, and follow him on Twitter at @EnergyVanguard. RELATED ARTICLESHow to Install Flex Duct ProperlyShould Flex Duct Be Banned?The Two Main Reasons Your Ducts Don’t Move Enough AirHow to Move Air Quietly Through a Duct SystemRaining, Dripping, Crying Duct BootsKeeping Ducts IndoorsWhy Don’t More HVAC Contractors Own Duct Leakage Testers?Duct Leakage TestingSealing Ducts: What’s Better, Tape or Mastic? Sagging flex duct is bad for air flow. We all know it. We all talk about it. It turns out there’s research data to prove it, too. Texas A&M did a study a few years ago to look at the pressure drop that occurs for different levels of compression. If you’re not familiar with this study, the results may astound you.Papers about scientific research aren’t always the easiest reading, but stick with me and I’ll see if I can make this one as painless as an Irish Car Bomb. (I’m talking about the drink, not an actual bomb, silly!) The paper I’m writing about here is Static Pressure Losses in 6, 8, and 10-inch Non-Metallic Flexible Ducts, (pdf) by Kevin Weaver and Dr. Charles Culp. If you’d like to read it, click that link in the last sentence and dive in. If not, let me give you what I see as the big takeaways in their work.What they didBriefly, the researchers set up a test apparatus that let them control the air flow through a section of duct, both rigid and flex. Then they changed some of the properties of the flex duct to see what happened to the air flow and static pressure. The diagram below (Image #2 at the bottom of the page) shows the test apparatus.last_img read more