Paul Industries designs and installs water systems across Michigan. In a converted industrial building the water service is one of the few things people assume they have inherited usefully, and it is one of the least reliable assumptions on the project. The incoming service was sized for an industrial use that may bear no relation to yours, and the distribution inside the building is decades old, of unknown material, and was never intended to carry water that touches product.

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The assumption That an existing water service is a usable asset
Capacity Sized for the previous use, which may be far more or far less
The distribution Old, of unknown material, never intended for product contact
The safe position New internal distribution from a defined point
Industrial power 8.26 cents/kWh, 1.02x the US average of 8.13 (EIA, 2024)
Reviewed September 2026, against current state code and EIA 2024 energy data

Inherited pipework is a liability, not an asset

The temptation in a conversion is obvious. The building has water in it, the pipes reach most places, and reusing them saves money at exactly the point in a project where money is tight. It is almost always the wrong call for anything touching product, and the reasons are worth setting out because they are not all obvious.

Material is frequently unknown. Distribution installed over several decades by different contractors may include galvanized steel, copper, plastics of various ages and whatever was used for a repair in between. Establishing what is actually there means opening it up in multiple places, and the answer is often inconsistent along a single run.

Condition is worse than it looks. Internal corrosion, scale and biofilm accumulate in old distribution, particularly in lines that have run intermittently or sat unused while the building was empty. A building that has been vacant for a period has water systems that have been stagnant for that period.

The layout serves the old process. Dead legs left by removed equipment are the defining feature of inherited distribution, and they are invisible because they are not on any drawing. Each is a stagnant branch on a system you are about to use for something more demanding.

It was never a product-contact system. Water for washing floors and filling machinery has different requirements from water that touches food or forms part of a pharmaceutical process, and the original installation reflects the former.

The defensible position in almost every conversion is to take a defined point of entry, establish what the incoming supply is with a current analysis, and install new internal distribution from there for anything serving the process. Inherited pipework can remain for genuinely non-critical duties, provided it is clearly identified as such and physically incapable of being cross-connected to the new system.

Capacity, which cuts both ways

Assessing an inherited water service
QuestionWhy it matters
What is the actual available flow and pressure?Not what the pipe size suggests; measure it
What was the previous peak demand?Indicates what the service was built to deliver
What is your coincident peak?Sanitation and process together, not daily average
What is the incoming water quality?A current analysis, not a historic one
Is there a fire service on the same supply?Affects available capacity and arrangement
What internal distribution exists and of what?Determines what can be reused, if anything
Treatment and distribution electricity at Michigan’s 8.26 cents/kWh
Continuous loadPer yearOver ten years
10 kW$7,236$72,360
25 kW$18,089$180,890
50 kW$36,179$361,790

The capacity question genuinely goes both ways, which is why measuring rather than assuming matters. A former heavy industrial building may have a service far larger than a food plant needs, which is a real advantage and occasionally allows a process that would otherwise need an upgraded supply. Equally, a building whose previous use was assembly rather than process may have a modest service that will not support a sanitation peak, and discovering that after the layout is fixed is expensive.

Stagnation during the conversion itself

One practical point that is specific to conversions and is routinely missed: the water system sits unused for the duration of the project.

A conversion takes months. During that period the new distribution is installed, pressure tested, and then left full and static while the rest of the building is finished. By the time the plant commissions, a system that was clean when installed has been standing at ambient temperature for a long period, and commissioning teams then find microbiological results nobody expects from new pipework.

The avoidable version of this is to plan the sequence: leave the system drained after testing rather than full, or if it must be left full, circulate and treat it; and build a proper sanitization and flush into commissioning rather than assuming new pipe is clean pipe. New pipe is clean on the day it is installed and is only as clean as what has happened to it since.

Frequently asked questions

Do you install water systems in Michigan?

Yes, statewide, including conversions: incoming service assessment, treatment, new internal distribution, hot water and the instrumentation around them. On conversions we treat inherited pipework as a liability to be assessed rather than an asset to be reused, which is usually what the evidence supports.

Can we reuse the existing pipework?

For genuinely non-critical duties, possibly, provided it is clearly identified and physically incapable of cross-connection to the new system. For anything serving the process, almost never. The material is frequently unknown and inconsistent, the internal condition is worse than it appears, and the layout carries dead legs from equipment removed years ago.

Why are dead legs the defining problem?

Because they are invisible. Branches left when equipment was removed are capped at one end and connected at the other, they appear on no drawing, and each is a stagnant volume on a system you are about to use for something more demanding than its original duty. Finding them means tracing rather than reading.

How should we assess the incoming service?

By measuring available flow and pressure rather than inferring from pipe size, establishing what the previous peak demand was, comparing that against your coincident peak including sanitation, obtaining a current water analysis, and checking whether a fire service shares the supply.

Could the service be too large?

Frequently, and that is an advantage worth knowing about. A former heavy industrial building may have a service well beyond what a food plant needs, which occasionally enables a process that would otherwise require an upgraded supply. The point is to measure rather than assume in either direction.

What if the service is too small?

Then it constrains the layout and possibly the process, and it is far better known before the layout is fixed. A building whose previous use was assembly rather than process may have a modest service that will not support a coincident sanitation peak, and upgrading an incoming service is a utility-company timescale rather than a contractor one.

Why do new systems fail commissioning tests?

Usually because they were not new by the time they were commissioned. A conversion takes months, and distribution installed and pressure tested early sits full and static while the building is finished. New pipe is clean on the day it is installed and only as clean as what has happened to it since.

How is that avoided?

Plan the sequence. Leave the system drained after testing rather than full, or circulate and treat it if it must stay full, and build a proper sanitization and flush into commissioning rather than assuming new pipework needs none. It costs very little to plan and removes a class of commissioning delay.

Does Michigan energy cost affect the design?

Modestly. At 8.26 cents per kilowatt-hour against a national average of 8.13 (EIA, 2024), Michigan is close to the midpoint, so continuous recirculation is affordable and should not be traded away. In a cold climate the more relevant energy question is freeze protection and heat loss on distribution in unheated parts of a converted shell.

How do I get a quote for a Michigan water project?

Use the form on this page or call 201-450-8280. Useful inputs are the building’s previous use, measured incoming flow and pressure if you have them, a current water analysis, your coincident peak demand including sanitation, and what internal distribution exists and of what material.

Can existing pipework be reused?

Very rarely for anything the process depends on, and the assumption that it can is one of the more expensive mistakes in a conversion. Industrial pipework is usually the wrong material, contains branches nobody can account for, has unknown internal condition and was installed with no regard to drainability. Reusing it inherits every one of those problems.

How should the incoming service be assessed?

By measuring rather than by reading the meter size: available flow at realistic demand, pressure at the point of entry and at peak building demand, and water quality from the actual supply across seasons. Older buildings frequently have a service that was adequate for a previous use and is now either badly oversized or genuinely insufficient.

Does Michigan feed water vary much?

Considerably. Plants drawing treated Great Lakes water get a consistent, moderately hard supply, while much of the state’s manufacturing runs on groundwater carrying higher hardness, iron and manganese. Iron in particular causes staining and fouling that a design based on a lake-water analysis will not have allowed for.

Does winter feed temperature affect the system?

Noticeably, because reverse osmosis output falls as water gets colder and Michigan supplies run genuinely cold in winter. A system sized on summer performance can fail to meet demand in February. Either the membranes are sized for the cold case or the feed is tempered, and that decision belongs in the design rather than in a later capacity upgrade.

What backflow protection is required on the incoming service?

Protection appropriate to the hazard the facility presents to the public supply, which for a plant using chemicals or process water is usually a substantial requirement with testing obligations. In a converted building the existing arrangement is frequently inadequate for the new use, and it is a compliance item the water utility will raise.

How is legacy pipework material identified?

By testing rather than assumption, because buildings of this age contain whatever was available when each modification was made. Older building plumbing may include materials that are unacceptable for a process feed, and the only reliable way to know what is installed is to examine and analyse it rather than to read a drawing.

When should existing pipework simply be abandoned?

As soon as the survey shows unknown branches, unknown materials or internal condition that cannot be verified, which is most of the time. Re-piping a water distribution system in a converted building is straightforward work with a predictable cost. Attempting to rehabilitate legacy pipework is unpredictable, and the failures appear after the plant is operating.

How is a loop laid out in a high bay?

With the distribution run at high level and vertical drops to points of use, which is efficient and creates a specific risk: each drop is a branch that stagnates unless the outlet is used or the drop is arranged to remain swept. In a tall building those drops can be long, which makes the branch length problem worse than in a conventional facility.

Is freeze protection needed on water lines?

On anything routed near the envelope, at roof level or through unheated areas, yes, and the consequence of failure in a process plant is contamination as well as damage. Heat tracing has to be controlled so it does not create warm stagnant sections, which would trade a freezing risk for a microbial one.

What sanitisation regime suits a small operating team?

One that will actually be performed, which usually means a hot or continuously treated system rather than a periodic manual regime requiring discipline the team may not have capacity for. Converted facilities are frequently operated by small teams, and a control strategy that depends on a monthly procedure is a control strategy that will lapse.

What monitoring should be installed?

Continuous instrumentation on the parameters that matter with alarms to somebody who can act, because small facilities do not have staff watching trends. The most valuable additions are usually an alarm on loop flow or temperature and one on incoming water quality, since those catch the failures that otherwise reveal themselves through sampling weeks later.

How long does qualification take?

The mechanical work is short and the sampling programme is defined by elapsed time, running intensively at first and then through a longer period to capture seasonal variation. In Michigan that seasonal variation is genuinely significant on the feed side, which is a reason not to compress the extended phase.

What is the commonest conversion water mistake?

Assuming the water service was inherited usefully. It is the one utility people expect to be able to reuse, and it is among the least reliable assumptions in the building. The cost of establishing the truth is a survey and some testing; the cost of not doing so appears during commissioning when the plant is meant to be starting.

Should storage be atmospheric or pressurised?

Atmospheric with a filtered vent is the norm, and the vent filter then becomes a critical component: it must not blind with condensate, because a blinded vent either collapses the tank as it drains or admits unfiltered air as it breathes. In a cold building, condensate on a vent filter is a predictable seasonal problem.

How is the tank protected from the building environment?

By keeping the headspace clean and the upper shell wetted during recirculation, and by insulating where the building is cold enough that condensation would form on the tank exterior. In an uninsulated converted building a water tank can be the coldest surface in the room, which makes it a condensation collector.

What happens if the loop is undersized for a future line?

Flow in the new branch is inadequate or velocity in the original loop falls, and either outcome degrades microbial control. Conversions usually anticipate growth, so sizing the return and the pump with headroom, rather than exactly to the initial outlets, is the cheap decision that keeps the next expansion simple.

Planning a water system in a Michigan conversion?

Tell us the building’s previous use and whether anyone has measured the incoming service. Call 201-450-8280 or use the form below.

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