Furnace - exemple 1 :

Duration of the cleaning: 4 days.

	Before cleaning	After cleaning	Delta
Feed	821m3/hour	871m3/hour	+50m3/hour (+6.1%)
Radiation Cell temperature	866°C	736°C	-130°C
Convection Cell temperature	357°C	308°C	-49°C

Source: Furnace T2F****

Furnace - exemple 2 :

Duration of the cleaning: 4 days.

	Before cleaning	After cleaning	Delta
Radiation Cell1 temperature	847°C	667°C	-180°C
Radiation Cell2 temperature	842°C	648°C	-194°C
Convection Cell3 temperature	850°C	639°C	-211°C

Source: Furnace 40*A, 3 Radiations cells.

Ethylen Furnace - exemple:

	Eng. Units	Before cleaning	After cleaning
Feed (naphta)	kg/hr	9 071	9 403
COT	°C	825	825
Fuel gas flow	kg.hr	1 500	1 426
Fuel gas pressure	Bar g	1,60	1,33
O2	vol %	2,62	2,54
Excess air	%	1,142	1,138
Draft	mmH2O	3,45	3,31
Fan speed	rpm	1 550	1 400
Damper O.P.	%	106,9	100,0
Stack temperature	°C	254	205
Ambient temperature	°C	20	20

Fuel gas net heating value : 12 200 kcal/kg.
Combustion air required : 17,38 kg/kg fuel.

Aircoolers - exemple :

Increasing Aircoolers efficiency from process and economical point of view:

	Before cleaning	After cleaning	Delta
Tin	47,9°C	42,2°C	-5,7°C°C
Tout	40,8°C	37,5°C	-3,3°C