P.1 

OAR Box 1830 

Prepped by Ollie Stewart 

Document Number: 

19) IV-B-15 

Docket Number: 

A-87-11 

Printed 11/13/2008 7:20:51 AM Sheet 19 of 232 
WS&y 

>««* & ^ 

UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 

ANN ARBOR. MICHIGAN 48105 

P.2 

OFFICE OF 

AIR AND RADIATION 

DEC I 3 1933 

MEMORANDUM 

SUBJECT: 

FROM: 

TO: 

Refueling Emission - Partial Fueling 

Peter Hutchins /* 

Standards Development and Support Branch 

The Record 

The results of nine partial fuelings and one full fueling 

are shown in Table 1. These tests were performed by EPA to 

evaluate refueling emissions during partial fuelings of the EPA 

passive refueling emission control system. 

The EPA passive refueling emission control system used in 

this data collection consisted of a modified GM fuel tank and 

fuel filler, a "blue" vent valve, and a 4 liter canister 

connected to the vent valve be approximately 3 feet of 5/8" ID 

tubing. The RVP of the fuel used in this project was 

approximately 9 psi (measured values are shown in Table 1). 

All fueling operations were performed with the fueling cart 

dispensing flow rate set at 10 gpm and with the tank and 

dispensed fuel temperatures within NPRM limits (measured 

temperatures are given in Table 1). Prior to each refueling 

emission measurement, the canister was purged for approximately 

1 1/2 hours at a" flow rate of 1 cfm. Three refueling emission 

measurements were performed for each of three partial fueling 

ranges. The partial fueling ranges were; a) from approximately 

10% fuel tank volume to approximately 1/2 fuel tank volume, b) 

from approximately 1/2 fuel tank volume to full and c) from 

approximately 90% fuel tank volume to full. 

The averages of the 

measurements are as follows: 

partial refueling emission 

a) 10% to 1/2 tank volume ; 0.07 gram/gal. 

b) 1/2 tank volume to full; 0.01 gram/gal. 

c) 90% tank volume to full; 0.12 gram/gal. 
P.3 

-2-

The highest average refueling emissions rate (gram/gallon) 

occurred during the 90 percent tank volume to full tank 

fuelings; While this refueling emission rate was higher than 

the proposed standard (0.10 g/gal) for full fuelings, the 

actual mass of hydrocarbon emitted was low and represented 95 

percent or greater control of refueling emissions. It is also 

worth noting, that fuelings in this range; i.e., from an almost 

full tank to a full tank, occur infrequently. Two of these 

test had multiple shutoff, simulating customer topping off. 

Inspection of the SHED hydrocarbon concentration strip charts 

and other data sheets showed that these shut-offs do not appear 

to have been major contributors to the refueling emissions 

measured in the SHED. Most of the emissions appear to have 

been associated with the first shutoff in each case. 

Attachment: Table 1 
Date 

9-9-88 

9-13-88 

9-14-88 

9-9-88 

9-13-88 

9-15-88 

9-12-88 

9-14-88 

9-15-88 

9-13-88 

Measured 

RVP 

(psi) 

9.05 

9.00 

8.95 

8.95 

9.00 

9.00 

8.95 

8.95 

9.05 

8.95 

Fuel Volume 

Initially in 

tank (gal) 

1.51 

1.50 

1.50 

7.51 

7.52 

7.5 

14.2 

14.2 

14.2 

1.50 

Tabl 

Refueling Emissions 

Fuel Volume 

Dispensed 

(qal) 

6.0 

6.01 

6.02 

8.83 

8.85 

8.9 

2.45 

2.38 

2.22 

14.51 

Nozzle 

Shut 

Off 

manual 

manual 

l,auto. 

+manual 

l,auto. 

2,auto. 

l,auto. 

3,auto. 

4,auto. 

l,auto. 

l,auto. 

Tank 

Temp. 

<°F) 

79.7 

79.0 

79.7 

79.2 

79.3 

80.1 

80.0 

80.4 

79.9 

81.0 

e 1 

- Partial 

Dispensed 

Fuel temp 

(°F) 

81.1 

81.7 

81.3 

81.9 

81.0 

81.0 

81.7 

81.1 

81.3 

81.3 

Fueling 

Canister 

Initial 

(q) 

4152.1 

4168.2 

4159.7 

4153.0 

4163.7 

4159.8 

4177.1 

4162.6 

4157.3 

4166.9 

Weights 

Final 

(q) 

4187.8 

4210.0 

4199.6 

4207.8 

4222.2 

4217.2 

4192.4 

4178.6 

4171.5 

4266.0 

r 

HC Collected 

by canister 

(q) 

35.7 

41.8 

39.3 

54.8 

58.5 

57.4 

15.3 

16.0 

14.2 

99.1 

(q/qal) 

5.95 

6.97 

6.65 

6.23 

6.65 

6.45 

6.12 

6.67 

6.45 

6.83 

Refue ling 

Emissions 

0.31 

0.22 

0.71 

0.15 

0.00 

0.11 

0.44 

0.27 

0.13 

0.28 

g/gal) 

0.05 

0.04 

0.12 

0.02 

0.00 

0.01 

0.18 

0.11 

0.06 

0.02 

6544W