The Laundry Forum

[IronMan]

Is anyone else using Miura boilers? Very effecient boilers with a small footprint and low Nox emissions.

[laundryman]

Looked at them. No room for error with soft water. Everyone needs a little error room!

[IronMan]

We have some of the hardest water in Canada at 14 grains. We use a triplex softener for the main plant and then a duplex polishing softener in the boiler room. A Colormetry unit measures the feed water and if even a trace of hardness is present we get an alarm on the boilers. The manufacturer's rep can see our boilers on line and will phone us if we do not correct the problem. We put the boilers in two years ago and have inspected them twice. I have never seen cleaner boilers than these.
You are correct about the water treatment for these boilers. If you are not dedicated to good water treatment these boilers are not for you.
The benefits of these boilers far out weigh the efforts required in water treatment. They go from zero pressure to 140 PSI in ten minutes with no thermal shock. When they reach pressure they will shut off until the pressure drops.
Our previous boilers produced 450 HP and required a Third Class Operater. These boilers create 600 HP and only require a Fifth Class Operator.
I have operated traditional boilers for twenty years and I will never go back to the high mass boilers. These low mass boilers are much safer and more efficient.

[mustangmac]

Ill take a good ole fire tube over a water tube any day....can run the s**t out of them without too much worries. Water tube had a few other probs, but cant remember them right now.

[IronMan]

The Miura boiler is not a traditional water tube boiler. It has no down comers and no water column. It is actually a single pass steam generator. The water enters at the bottom and is turned into steam in the tubes. There is no upper drum. the tubes are much thicker than a water tube to handle the heat of generating steam in the tube.
I was a fan of fire tube boilers until I found out about these boilers. I agree that fire tubes can take a lot of abuse but if you have excellent water treatment these boilers have plenty of benefits.

[madsuperiormaint]

Heard of a laundry constantly blowing the stacks off of these boilers, don't know all the details but it turned out to be something that Miura was at fault for but refused to resolve the problem. All i really remember was the maintenance manager swore up and down about these units. Said they were to sensitive for the facility they were put into.

[IronMan]

We have had these boilers for two years and our sister plant for eight with no issues in either plant. Water treatment has to be spot on and the air has to be very clean to protect the unique burners. These are the best boilers I have worked with.

[Joel McClung]

Miura Equipment when compared to conventional firetube / water tube design will permit an end user / client to profitable realize a reduction in fuel consumption - cost by 25%. This is effectivly acomplished through low NOx (less than 12 ppm on specific models) and 99% dry steam. The additional advantage is there is no problem with "Thermal Shock". As such, no preheating or a deaerator is required. Stack temperatures are normally seen at less that 250 deg F. This is less than the medium - steam table temperature. Further information is available by contacting:

J.P. (Joel) McClung
Q.C. Manager
Miura / Prime Boiler Services
Cell: (780) 818-9889

[The Laundry List.com]

There are many boilers running with direct contact economizers in laundries where exhaust gas temperature is below ambieant air temperature, frequently in the 70 F. to 80 F. range! Much better than the 250 F. on indirect economizers such as found on Miura boilers.
12 PPM nox is good, but does not meet the 9 PPM requirement of EPA region 9!

[tunnelsforever]

"A Colormetry unit measures the feed water and if even a trace of hardness is present we get an alarm on the boilers. The manufacturer's rep can see our boilers on line and will phone us if we do not correct the problem".


Just sounds like more maintenance to me.

What about the price of Miuras? I'm assuming they cost more than traditional firetubes? Aren't they a Japan based company?