Diesel Generator Exhaust Piping 1

• Feb 18, 2022

• #2

DBronson

Structural

Jul 26, 2013

154

nuuvox000:

Cummins allows black iron Sched 40 on their systems - so it's probably ok. But, I'd check w/the manufacturer of your gen set to verify.

Regards,

DB

 

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• Feb 18, 2022

1
• #3

LittleInch

Petroleum

Mar 27, 2013

22,602

One word why- corrosion

Exhaust gas is quite corrosive to plain carbon steel.

A lot depends on how this gen set is used. Intermittent use will corrode faster.

A hole in an inside exhaust can kill people.

For 20ft of pipe why take the risk?

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

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• Feb 18, 2022

• Thread starter
• #4

nuuvox000

Mechanical

Sep 17, 2019

344

Thank you both for your information, you're awesome.

 

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• Mar 7, 2022

• #5

chicopee

Mechanical

Feb 15, 2003

6,199

Carbonic acid (carbon dioxide + water vapor) in the exhaust can be a problem with black pipe

 

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• Mar 7, 2022

• #6

EnergyProfessional

Mechanical

Jan 20, 2010

1,279

Also the sulfur content of the fuel and NOx from combustion will create acids. There is a reason better cars use stainless exhaust, and they may last fewer years than the life of the car. Before stainless steel exhaust was common, exhaust pipe and muffler replacement were common repairs on a car. I wouldn't use carbon steel.

 

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• Mar 8, 2022

• #7

M

MintJulep

Mechanical

Jun 12, 2003

10,125

Black pipe with a properly selected internal coating could be ok.

If you can find a coating that would tolerate the temperature.

 

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• Mar 8, 2022

• #8

EnergyProfessional

Mechanical

Jan 20, 2010

1,279

MintJulep: do you know of an actual product? I'm not aware of a coating that can be applied perfectly over the entire inside of the pipe inc. the fittings and survives the cutting and welding etc. Then it needs to survive the hot/acidic/wet/abrasive environment. If that actually exists, I bet using stainless steel will be cheaper and more reliable.

 

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• Mar 8, 2022

• #9

M

MintJulep

Mechanical

Jun 12, 2003

10,125

@EnergyProfessional
There are field-applied products that under good conditions can achieve a continuous film for at least "a while".

I don't know if any of them would survive exhaust temperatures.

I would not bet against your cost and reliability guess.

 

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• Mar 16, 2022

• #10

MJCronin

Mechanical

Apr 9, 2001

5,097

There are many, many indoor installations of these engines..

As stated above, what does the engine vendor suggest ? .... The additional cost of a 10S SS system is modest and will probably have a mich longer service life than a black CS pipe

This document might be helpful:

https://www.cliffordpower.com/wp-content/uploads/2020/01/IS_16_Exhaust_Layout1.pdf

MJCronin
Sr. Process Engineer

 

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• May 17, 2022

• #11

enginesrus

Mechanical

Aug 30, 2003

1,016

LittleInch (Petroleum)
A hole in an inside exhaust can kill people.

For 20ft of pipe why take the risk?
--------------------------------------
If it was a gasoline engine you would be correct.
Diesel engines have been used in underground mines long before anyone was worried about emissions.
Gasoline engines produce a lot of Co, Diesel engines not so much, though I would tend to think
the ones that use EGR would produce more than the older ones of years past.
The smart thing would be to always vent a room that is to contain an engine.

 

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• May 17, 2022

• #12

LittleInch

Petroleum

Mar 27, 2013

22,602

There's a lot of difference between a mine where you have active constant ventilation and what we think might be a pretty closed room.

If the room was constantly ventilated then it might be acceptable. But for the cost why bother.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

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