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Q88. If a combustion unit with a heat input capacity less than 250 mmBtu per hour burns both natural gas and a liquid fuel, and the quantities are known can Tier 1 be used for the natural gas calculations and Tier 2 for the liquid or must Tier 2 be used for both?
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A88.

...

  The

...

tiering

...

requirements

...

are

...

applied

...

to

...

each

...

fuel

...

in

...

a

...

combustion

...

unit,

...

not

...

to

...

the

...

combustion

...

unit

...

as

...

a

...

whole.

...

Therefore,

...

in

...

this

...

example,

...

different

...

tier

...

calculation

...

methods

...

can

...

be

...

used

...

for

...

the

...

natural

...

gas

...

and

...

the

...

liquid

...

fuel

...

combusted

...

in

...

the

...

same

...

combustion

...

unit.

...

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Source: This question and answer was derived from a Legacy FAQ

Approval / Publishing History: Version 1

Expiration : none

Relevant Subparts:  Subpart C
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