Immersion Suit SOLAS Requirements — What You Need to Know

Immersion Suit SOLAS Requirements — What You Need to Know

Anyone who has ever tried to get into an immersion suit in a hurry will know — they are nothing like you imagine. They are huge, the zips are stiff and heavy, and every suit is slightly different. In an emergency, that matters.

I’ll be straight with you — most articles about immersion suit regulations are written by people who have never actually put one on. I have. And there’s a significant gap between what the regulations say and what it actually feels like to don one of these suits under pressure. This is something you practice on the BOSIET Training or STCW Basic Training and is well worth doing!

This guide covers both. The official SOLAS requirements you need to know, and the honest practical reality from nearly two decades working at sea.

What Is an Immersion Suit?

An immersion suit is a watertight survival garment designed to keep you alive in cold water long enough to be rescued. In North Sea conditions, without one, you have minutes. With one, properly donned, you have hours. That difference is everything.

They are bright red or orange for visibility, constructed from waterproof non-flammable materials, and they cover your entire body except your face.

Key Immersion Suit SOLAS Requirements

SOLAS Chapter III and the LSA Code (Chapter 2, Section 2.3) set out the design and performance standards every compliant immersion suit must meet. Here are the ones that matter most:

Donning time — The suit must be capable of being donned without assistance within 2 minutes, including the time to don any associated clothing and a lifejacket. This sounds straightforward. In a warm drill environment with no stress, it’s achievable. In a real emergency at sea in the dark — it is genuinely challenging, which is exactly why regular drills matter. iMariners

Fire resistance — The suit will not burn or melt after being fully engulfed in fire for 2 seconds. iMariners

Full body coverage — The suit will cover the whole body except for the face. Hands shall also be covered unless permanently attached gloves are provided. Marine Teacher

Water entry after jumping — Following a jump from a height of not less than 4.5 metres into the water there is no undue ingress of water into the suit. Marine Teacher

Turning face-up — A person wearing an immersion suit shall be able to turn from a face-down to a face-up position in not more than 5 seconds. IMO Rules

Lifejacket compatibility — If the immersion suit is to be worn in conjunction with a lifejacket, the lifejacket shall be worn over the immersion suit. Marine Teacher

The Honest Practical Reality

Here is what the regulations do not tell you — and what I wish someone had told me before my first drill.

Immersion suits are designed as a one-size-fits-most solution. In practice, this means they are almost always too large for the person wearing them. The suits are bulky and clunky by design, and the zips are heavy and stiff — deliberately so, because they need to create a watertight seal under pressure.

Getting that zip done up is harder than it sounds. I have always been concerned about catching clothing or the suit material itself in the zip, which can cause rips and compromise the seal. That concern is legitimate and worth paying attention to every time you don one.

Different suits on different vessels are also built slightly differently. The clasps, the face covers, the integrated gloves — they all vary between manufacturers. This is confusing even when you are calm, and in an emergency with adrenaline running, you will likely forget some steps. That is not a failure — it is human. Which is why the key priorities in a real emergency are straightforward:

— Ensure the suit is fully secured and the zip is up all the way
— Confirm your head and torso are completely covered
— Check there is enough mobility to pull your legs up to your core
— Make absolutely sure the face splash guard is in position

That last point is more important than most people realise. Cold water shock when you first enter rough water is a genuine danger. The involuntary gasp reflex when you hit cold water can cause you to inhale sea water — and in big wave conditions with no face protection, that is potentially fatal. The face cover is not an optional extra.

My honest advice: every person who works on the water, commercial or recreational, should practise getting into an immersion suit at least once before they ever need to rely on one in an emergency. The two-minute donning requirement assumes you know what you are doing. Make sure you do.

Inspection Requirements

Suits must be inspected monthly and serviced annually by a certified service station. The packaging of vacuum sealed immersion suits must be inspected monthly. Should any damage be found, or the seal broken, or the vacuum lost, the suit must be removed. Bahamasmaritime

Check the zip, the seals, and the inflation bladder if your suit has one. A suit that looks fine folded in its bag can have a perished seal you will only find when you unroll it. Check it yourself — do not rely solely on the inspection sticker.

Where to Find the Official Regulations

All SOLAS immersion suit requirements are documented in the IMO’s Life-Saving Appliances Code, Chapter 2, Section 2.3. You can access this directly at imo.org. Always refer to the official source for the most current requirements — regulations are periodically reviewed and updated.

Quick FAQ’s

1. How often should an immersion suit be serviced? Every 12 months by a certified service station — don’t leave it longer.”
2. Can you wear an immersion suit over a drysuit? No — the suit is designed to be worn over normal clothing only… and you wouldnt want to have them on too long, they are comfortable and can get hot when not in the water

The Bottom Line

Immersion suits save lives when they are properly maintained, properly fitted, and properly donned. The SOLAS requirements exist for good reason — but the regulations are only as useful as the person wearing the suit. Practise, check your equipment, and know your suit before you need it.

The information in this article is for general guidance only. Always refer to current SOLAS and IMO documentation and consult a qualified marine safety professional for compliance advice specific to your vessel.