It is the second question on almost every first call, right after whether the job is possible at all: what does pipe freezing cost? We understand why people want a number on the phone, and we would rather explain honestly why there is not one than invent a figure that turns out to be wrong when we see the line.
A cryogenic freeze is not a product with a list price. It is a mobilised operation whose cost is driven by physics, access and time, and those three things vary enormously between jobs that sound identical in a phone description. This article sets out exactly what moves the number, so you can size the job in your own head before you call and give us the information that produces an accurate quote first time.
Why Nobody Publishes a Price List
Two jobs described as “freeze a six inch chilled water line” can differ by a factor of several in cost. One is at waist height in a clean plant room with a loading dock forty feet away. The other is nine metres up in a live production area, needs scaffold, needs a permit, needs a night shift and needs two freeze points instead of one.
The freeze itself is the same physics. Everything around it is not. Any company quoting you a firm price before understanding the surroundings is either padding heavily or about to have an uncomfortable conversation with you later.
What Actually Drives the Number
Pipe diameter, material and wall thickness
This is the physics half of the quote. Thermal mass rises with diameter and with wall thickness, and different materials conduct heat out of the fluid at very different rates. More thermal mass means more nitrogen and more time on site, and both are direct costs. Our breakdown of how material, schedule and wall thickness affect freeze time covers the mechanism, and what size pipe can be frozen covers where diameter stops being an economic question and starts being a feasibility one.
What is in the line
Water freezes readily. Glycol mixes need to be taken lower, sometimes considerably lower, which means more nitrogen. Oils, fuels and process fluids each behave differently, and some need a longer plug to achieve the same holding strength. The fluid is not a detail on the quote, it is one of the main inputs, as our guide to what fluids can actually be frozen explains.
How many freeze points the job needs
A single plug isolates one direction. Most repairs need the section bracketed, which means two plugs, two sets of jackets and roughly double the nitrogen. Where the consequence of failure is high, a two-plug arrangement with a vented section between them is the right design regardless of cost, which we cover in our article on whether a freeze plug counts as a positive isolation.
Access and working position
Where the jackets have to go decides how much of the day disappears before any nitrogen flows. Ground level and open is cheap. Overhead, in a ceiling void, behind plant, in a pit, on a roof in February, or anywhere needing scaffold, lifts or confined space entry costs real time. Our piece on indoor versus outdoor freezing challenges goes through what changes with position and environment.
How long the isolation has to hold
A plug is maintained, not installed. Every hour the isolation is required is an hour of nitrogen and an hour of attendance. A twenty minute gasket change and a six hour valve replacement are different jobs even on identical pipe. When you scope the work, scope the repair honestly, including the time waiting for parts, inspections or a welder.
How quickly you need us
Planned work booked with notice is the efficient case. A burst line on a Sunday night is not, and emergency response carries the cost of dropping other commitments and mobilising immediately. That premium is real and we will always tell you what it is, though as our article on emergency pipe isolation notes, the comparison that matters is against the cost of the water still running.
Site requirements and documentation
Permits, inductions, method statements, risk assessments, escorts, background checks, out-of-hours working and gas monitoring all consume time. On a hospital or a secure facility this can be a meaningful share of the day. It is not padding, and it is far cheaper to plan for than to discover on arrival.
Where the job is, and where the nitrogen comes from
Liquid nitrogen is consumed continuously and it does not travel for free. Distance from the nearest supply point affects both the delivered cost of the gas and the practicality of holding spare capacity on site, and remote locations sometimes need a larger vessel simply to guarantee the isolation can be maintained for the full duration. Travel and mobilisation for the crew sit alongside that. None of it is exotic, but it is why the same freeze costs differently in a city centre plant room and on a rural site two hours from anywhere.
It is also why batching work matters. If you have three isolations to do on the same system, doing them in one visit is materially cheaper than three separate mobilisations, and it is worth asking the question before you book the first one.
The Cost That Is Not on Our Invoice
The number that usually decides whether a freeze makes sense is not our price. It is what the alternative costs. Draining a system, refilling it, rebalancing it, chemically retreating it and restarting it carries labour, consumables and risk, and behind all of that sits the value of whatever was not operating while it happened.
That is the comparison our cost comparison against a traditional shutdown is built around, and in a data centre, a hospital or a production line it is rarely close. A freeze is bought to avoid a shutdown, and it should be priced against one.
Where a Freeze Stops Being the Cheap Option
We will tell you when it is not the right answer. Very large diameters, isolations that need to hold for days rather than hours, lines that cannot be made static, and media that will not form a sound plug all push the economics elsewhere.
In those situations the comparison worth running is against a mechanical intervention. Our article on pipe freezing versus line stopping covers where a permanent fitting becomes the better value, and freezing versus hot tapping covers the tapping route. There is also a floor below which the sensible answer is simply to use the valve you already have.
What is almost never the cheap option is doing it yourself. The risks of a hire kit versus a professional crew are not evenly matched against the saving, particularly on anything above small domestic pipe.
What to Send Us for an Accurate Number
Six things get you a firm quote quickly. Pipe outside diameter, material and wall schedule if you know it. What is in the line and its normal operating temperature. System pressure. Whether flow can be stopped, and how. Photographs of the intended freeze locations and the access to them. And the repair scope with a realistic duration.
If you have a drawing, send it. If you only have a photograph and a tape measure, that is usually enough to get started. We would far rather ask questions before quoting than revise the number on site.
Frequently Asked Questions
How much does pipe freezing cost?
There is no standard price, because cost is driven by pipe size and material, the fluid in the line, the number of freeze points, access, how long the isolation must hold and how urgently you need the crew. A short single freeze on accessible small-bore pipe and a two-plug isolation on large-bore pipe at height are different orders of cost. Send the line details and we will quote the actual job.
Is emergency pipe freezing more expensive than planned work?
Yes. Emergency response means mobilising immediately and rescheduling other commitments, and that carries a premium we will state clearly. Against an uncontrolled leak or a facility that is down, it is still very often the cheaper decision, but it is more expensive than the same freeze booked with notice.
Do you charge more for two freeze points?
A second plug roughly doubles the nitrogen and the jacket set for that isolation, and it adds setup time, so it does increase the cost. It is not double the total job, because mobilisation, access and site time are shared. Where the work sits between two plugs, it is normally the correct design rather than an upsell.
Does glycol make a freeze more expensive?
Usually, yes. A glycol mix has to be taken to a lower temperature than plain water before it forms a sound plug, which means more nitrogen and more time. It is entirely routine work on chilled water systems, but it should be declared at quotation stage rather than discovered on site.
Can you give a price over the phone?
We can usually give you a realistic range on the phone once we know the pipe, the fluid and the access, and tell you straight away if the job is not suited to freezing. A firm number normally follows a photograph or two. What we will not do is quote a figure before we understand what we are being asked to isolate.
Get a Quote on the Actual Job
Tell us what the pipe is, what is in it, where it runs and what you need to do to it, and we will come back with a number you can plan around. If freezing is the wrong tool for your situation, we will say so and tell you what we would do instead.
Request a quote or contact the team and we will take it from there.
