Inflatable PFD Care and Use

Posted by Darrell Nicholson at 12:00AM - Comments: (8)

 

Joe Barnette (left) helps Demetri Lignos adjust straps on an inflatable lifejacket during a recent test. Although manufacturers don't recommend using the auto-inflation feature during testing, Barnette and Lignos, both members of the U.S, Coast Guard Auxilliary, were well aware of the risks associated with a "real-world" test and the responsibility that user has of ensuring the auto-inflation device is re-armed correctly.

Some sad news this past weekend from the Chicago-Mackinac race prompted me to update, and repost this advisory from 2015 regarding the care and use of personal flotation devices. It's a relatively long post, but if you depend on inflatable PFD, the text and accompanying links are worth reviewing.  

The following account of the accident comes from Nick Berberian, Rear Commodore at the Chicago Yacht Club, which hosts the annual event: "At approximately 2:45 p.m. on Saturday Jon [Santarelli, age 52, aboard the TP52 'Imedi'] was moving toward the back of the boat—stern of the boat— to make a routine sail adjustment, unfortunately at that precise time, a large wave hit the boat, causing him to slip into the water . . . Jon was wearing a personal floatation device that is designed to automatically inflate when it comes into contact with the water. The crew members have reported that the device did not inflate. . . ."

The accident is particularly disturbing for me because Santarelli was an extremely experienced sailor, he was sailing with a very experienced and well-trained crew, and presumably was equipped with first-rate safety gear. As of yet, Santarelli's body has not yet been recovered, so the reasons why the PFD did not inflate are unkown. Most auto-inflate PFDs allow the wearer to disable the auto-inflate function, so it is too early to conclude that something may have gone wrong with the device itself. Berberian's full press conference, offering more details of the accident, can be viewed at the Chicago Yacht Club's Facebook page.

It is important to make clear that despite the shortcomings of current PFD designs, they remain an essential tool for survival at sea. Without reservation, PS encourages boaters to wear the appropriate type PFD while sailing, in any boat and any water. At present, a properly maintained auto-inflating PFD has proven itself to be a versatile and effective device for everyday use when offshore sailing, where great mobility and an abundance of flotation is required. However, it is important to recognize that auto-inflate vests are not our only option. Small boat and inshore sailors are often better served by a conventional inherently buoyant lifevest. It is important to weigh the pros and cons of each device when choosing the right one for a particular activity.

Random Testing

A few years ago, I had the opportunity to join Practical Sailor reader Joe Barnette and his friend and longtime crewmember Demetri Lignos as they tested the inflatable lifejackets that Joe keeps aboard his Island Packet 465. Both Barnette and Lignos are members of the local U.S. Coast Guard Auxilliary in Sarasota, and Barnette has three trans-Atlantic crossings to his credit. Barnette is planning another ambitious voyage in the spring and he figured it was a good time to take a close look at his safety equipment.

All of the inflatable lifejackets were combination harness/vests designed to auto-inflate upon immersion. One was the Mustang 3184, our top-rated jacket from previous test. The others were Sospenders made by Stearns. The ages of the vests ranged from three to six years. Although they had been inspected regularly, none had been serviced. The presumption was that at least one of these jackets would fail to inflate, or would lose most of its air in 16 hours or less, the minimum time period recommended by any manufacturer.

The test took place in the pool at the Bird Key Yacht Club, overlooking Sarasota Bay in Sarasota, Florida, a few miles from our home office. Temperatures were in the 90s. While Barnette and I sweated it out poolside, Lignos was happy to play the part of guinea pig. He gamely plunged into the pool again and again, trusting his fate to the aging inflatable lifejackets. Our safe, nearly idyllic environment provided little insight into survival at sea, but in the same way that even an ideal first date can expose snags in a relationship, a quiet-water trial can offer ample clues of impending equipment failures; more importantly, there is little risk of drowning—unless, of course, things go terribly wrong.

The good news is that every one of the auto-inflating lifejackets that we tested inflated as designed. Within a few seconds of immersion, Lignos buoyantly bobbed back to the surface. The bad news was that the experiment, even in such tame conditions, pointed out many of the flaws with inflatable life jackets.

I’ve discussed the pros and cons of inflatable personal floatation devices (PFDs) in several blog posts and editorials in the past. And they are again addressed each time we test PFDs. Rather than rehash these issues here, I’m providing links below to some of the more relevant articles and tests. Even if you think you are intimately familiar with your inflatable PFD, I encourage you to review these links. And there is also our ebook on Man Overboard Prevention and Recovery, which covers this topic in depth. 

Common Mistakes, Product Recalls

One mistake that sailors make with their inflatable lifejackets is that they fail to recognize that these devices require regular inspection, not just monthly or annually, but each time before setting out in your boat. In addition to pre-departure checks, there are seasonal and annual maintenance checks. If you haven’t reviewed the recommendations for your manufacturer, you should. I have provided links to the maintenance advice for two of the manufacturers below. 

A second error is a failure to repack correctly. Some systems, especially the hydro-static devices that are triggered by hydrostatic pressure (rather than simple immersion), an incorrect packing can delay or prevent full inflation. Spinlock (equipped with Pro Sensor auto-inflator), Mustang (Hammar auto-inflator), and other manufacturers use these inflation systems, which are particularly popular among racers because they are less likely to accidentally inflate when the boat takes a bow wave and the wearer is doused in water.

In recent years, I've heard about device failures from safety experts who lead PFD demonstrations around the country. Sometimes the PFDs only partially inflate, sometimes they don't inflate at all. Currently, there is no hard statistics on the number of such failures, nor have the precise causes in each case been thorougly documented, but we have begun working with instructors to begin collecting this data. During these demonstrations, the participants inspect and re-arm the inflation system, re-pack, and don their own PFD (or one provided by the event sponsor), and jump into a pool. The purpose of the demonstration is to familiarize sailors with the gear, both on land and in the water.

According to those I've spoken with, one possible problem with the hydrostatic devices is that if the water pressure sensor in the auto-inflator is blocked by the bladder or cover material during repacking, it might not trigger inflation, or auto-inflation could be delayed. Some testers have reportedly been able to duplicate this failure mode, and we are currently investigating this. It is clear that these devices are not immune to design problems. Over the years, several prominent makers including Crewfit, Mustang Survival, and Spinlock have all issued voluntary recalls over the past several years. Suffice to say that if you haven't registered your product with the manufacturer and checked for any recalls, you should do this immediately. And if you are unfamiliar or have questions regarding the proper re-packing or re-arming of your vest (see links below), contact the maker. 

PFD Advice

This isn't the first time that an offshore racing event has prompted a discussion of inflatable PFDs.

Ron Trossbach, head of the US Sailing investigation into the Rambler 100 accident, offered several key findings regarding inflatable life jackets as a result of the Rambler 100 accident.

  • Always wear your own life jacket, properly fitted and secured. “A life jacket isn’t on until it’s complete with fitting/adjustment, crotch straps attached, and PLB and bright strobe on your person. The tether/harness must be attached (but not necessarily hooked on).”
  • Life jackets should be either on a person, hooked to their bunk, or otherwise immediately available.
  • Inspect your life jacket every time you put it on and conduct an air test of your inflatable annually.
  • Revisit the decision whether you want to wear an automatic or manual inflating life jacket. Familiarity with using the dump valve on your PFD was emphasized in our preliminary study of what can happen in a capsize.
  • Know how to manually inflate your inflatable life jacket. Finding the pull cord is not always easy.
  • Wear crotch/thigh straps (required by ISAF OSR 5.02.5 b on all harnesses since 2011). Know how to deploy and use your spray hood. (Splash guard/spray hoods are already strongly recommended by ISAF OSR 5.01 j.)
  • Upgrade your whistle. The Fox whistle did best in our emergency whistle test. (Installed PFD whistles were considered useless.)
  • Many PFD strobe light sensors must be in water to work, and they are not very bright.
  • We offered our own recommendations in regarding both PFDs and harnesses in our analysis of the report on the fatal capsize of the racing sloop Wingnuts in 2011.
  • Tether quick-release snap-shackles do not consistently release when the tether is under loads of greater than about 150 pounds. So if you are being dragged behind your boat, you will likely have to cut yourself free, or relieve the strain on the tether with a great deal of arm strength before you can trigger the quick release.
  • Accessing the tether’s quick-release mechanism when hooked into inflated harness/PFDs can be extremely difficult.
  • When not in use, boat-end tether clips or clips on two-leg tethers should never be attached to the harness. Only a single quick-release snap-shackle or similar device should be connected to the harness.
  • Auto-inflating harnesses can prevent deaths due to the “gasp reflex,” in which a drowning victim (typically in cold water) reflexively ingests water, but they have shortcomings, one of which is prevent escape from an overturned vessel or flooded cabin.
  • Know how to deflate your inflatable PFDs. Trying to escape from a sinking or capsized boat, reboarding a boat, or boarding a life raft in an inflated PFD can be extremely difficult.
  • A sharp knife should be kept handy at all times while underway. We've tested several knives over the years, some of our favorites are featured in this Practical Sailor sailing knife test.
  • Personal locator beacons (PLBs), whistles, and lights that are worn at all times can be valuable lifesavers.

Past PS Tests and Maker Links

We’ve carried two major tests of inflatable PFD/harnesses in recent years, with several smaller follow-ups. In 2006, noted offshore sailor Skip Allen tested several models in the cold waters of California. And in a followup life-jacket harness test in June 2008 we tested at three fairly new entries to the field, representative of a trend toward light-weight models. Although both of these tests appear fairly old, safety design tends to evolve quite slowly. Most of these products, or near copies are still on the market today.

Maintenance guidelines vary slightly by manufacturer, but the guidelines offered by West Marine in their do-it-yourself checklist for inflatable PFD maintenance will generally apply to other brands.

Mustang, maker of one of our top-rated inflatable PFD harnesses, the 3184, offers its own series of Mustang Survival YouTube videos demostrating re-arming. It is important to note that two versions of Mustang PFDs have been subjec to recall, including the later version of the 3184.

For those looking for instructions on re-arming their PFD my editorial on the elusive perfect fit  featured the following links. 

Mustang Automatic MD3053, MD3054, MD3083, 3084

Revere Comfort Max

Deckvest Hammar 170N

Landfall Navigation, one of the leading providers of safety equipment, also offers a number of useful videos and links to manuals.

We reported on concerns raised about the Spinlock’s popular (and expensive) low-profile lifejackets in the aftermath of an accident in 2012.

We looked at the Spinlock along with some more conventional inherently buoyant PFDs in 2013.

Michael Garman's custom, factory-fitted life jacket design won first place - and $10,000 - in BoatUS 2015 Life Jacket Design Competition.

This leads me back to Michael Garman, the winner of the BoatUS 2015 Innovation in Lifejacket Design Competition. I was pleased to sea that he did not fuss around with inflators and instead focused on proper fit. If there is one thing that Barnette, Lignos and I agreed on, any PFD/safety harness, whichever the brand, must fit snugly to perform properly. In some designs, in order to prevent the PFD from riding up under the arms of the wearer when he's in the water, the straps must be so snug as to almost be uncomfortable. For a couple of the test inflations we intentionally loosened the straps on Lignos's vest. When he bobbed to the surface he was dangling precariously from two buoyant bubbles, struggling to stay afloat. It was comforting to see that each of the vests inflated as designed, despite having had little maintenance or attention over the years, but after all the testing was complete I couldn't escape the conclusion that inflatable PFDs have many inherent weaknesses—and that it was a good thing we weren't at sea.

 

Comments (8)

Spinlock offers both water and hydrostatic triggers; the UML Pro Sensor is water activated (and can be converted to manual only), as is the Halkey Roberts Alpha Auto Inflator, and the Hammar which is pressure activated.

Posted by: Stephen C. | August 11, 2018 1:08 AM    Report this comment

I'm sure there will be a full report on the incident. My questions is why did Jon Santarelli sink within minutes? Presumably he was a swimmer, meaning even with foul weather gear on, he should have been able to tread water for quite some time. Instead, the early report was that he slipped below the water within just a few minutes. The boats were sailing up wind and thus returned to the spot very quickly. The report is he simply slipped overboard and was not injured. (no final report yet)

I wonder if cold water (about 50F) and the shock of sudden immersion is also a factor. We may be talking about a heart attack or something similar, in which case a PFD might not have saved him. This was very likely a factor in the loss of Speirs from one of the Clipper Round the World race boats this winter.

Something for cold water sailors to think about.

Posted by: Drew Frye | August 1, 2018 10:00 AM    Report this comment

I find this comment "Small boat and inshore sailors are often better served by a conventional inherently buoyant lifevest." curious.
I sail offshore and have been considering abandoning my inflatable PFD's for exactly one reason.
Technology Fails, I have made a good career because of it, it is a simple fact!
So when it comes to my life, or the life of my family, I am less and less inclined to trust it.
I believe in the KISS principal and there is not much simpler than a foam-filled USCG rated vest.
And last time I looked, the local coastguard crew was not wearing an inflatable! They go Way offshore and have to work while doing so, and somehow they are able to manage without the trendy inflatable.
So I have to ask, to what deep facts do you attribute this statement "Small boat and inshore sailors are often better served by a conventional inherently buoyant lifevest"
Seems like big boat and offshore users could be well served by a PFD that actually floats when you need it to.
And yes, I am aware that the recent victim has not been recovered so we do not know if his PFD auto-inflate feature was disabled.
I too have disabled mine because working the deck in foul weather can result in unintended activation. The conundrum is that is when you are most likely to need it to inflate.
Much simpler if you take the "inflate" need out of the mix.

Posted by: Bowman | July 26, 2018 7:44 PM    Report this comment

Question: I routinely wear a fisherman vest PFD with traditional flotation so I can store various safety equipment in the pockets. I am, however, not happy with the low bouyancy value as compared to inflatables. As I am concerned about inflatable malfunction, particularly when single-handing, and wonder if there is a hybrid vest PFD that has both inflatable and traditional inflation...along with pockets.

Any thoughts?

Posted by: vulcan213 | July 26, 2018 10:43 AM    Report this comment

Recently I made a test on my two Baltic PFD before the beginning of the season.
One of them a 19-year old Quickfit model, had a major loss of air through the hole for the attachment of the valve in the bladder. That PFD was never serviced but tested by myself sometime following the instructions of Baltic. The last time, two years ago, was in order. The second one , a Winner 150 model, three year old, was in order.
The aging of the materials is of course the reason of the detachment of the bladder from the valve. Even if consciously stored in a dry ditch bag, without any folding, I suppose the thermal cycles of the seasons have had their effect .
Now I' m substituting the old with a new one reasonably offered by Baltic at a price lower than maket std.
The questions are:
The bladder material are always the same (or it looks like): no improvements have been made after 20 and more years.
The attachments of the valves (CO2 valve and insufflation/deflation hose) to the bladder should be investigated for a better mechanical/chemical performance against extra efforts that could be subject.
The manufacturer doesn' state an expiry date.
I hope you will take in account some further investigations on these arguments.

Posted by: albatrosbis | June 14, 2016 1:24 PM    Report this comment

Mustang Survival does manufacture the MA7219 Auto-Manual Conversion Cap for the Hammar Hydrostatic Inflator. However, use of the MA7219 Conversion Cap voids USCG approval for the device.

Posted by: sailordn | November 13, 2015 1:27 PM    Report this comment

Many PFD makers offer kits for converting auto inflatable PFDs to manual inflatable. If the PFD uses the Halkey Roberts firing system, then there's most likely a kit availbale for the conversion, and the change would be approved and would not void the PFD's warranty. However, we don't know of any kits for converting a hydrostatic PFD to a manual inflatable.

Posted by: Ann Key | September 17, 2015 12:08 PM    Report this comment

Is it possible to convert an auto inflatable PFD into one that can only be manually inflated by pulling the activation cord?

Posted by: mconlon | September 17, 2015 11:21 AM    Report this comment

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