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Inspection Detail
Inspection: 120195862 - Unocal San Francisco Refinery
Inspection Information - Office: American Canyon District Office
Site Address:
Unocal San Francisco Refinery
1380 San Pablo Avenue
Rodeo, CA 94572
Mailing Address:
, , 00000
Union Status: Union
SIC:2911
NAICS: 0
Inspection Type: Accident
Scope: Partial
Advanced Notice: N
Ownership: Private
Safety/Health: Health
Close Conference: 12/05/1995
Emphasis:
Case Closed: 07/08/1996
| Type | Activity Nr | Safety | Health |
|---|---|---|---|
| Accident | 362077802 |
| Violations/Penalties | Serious | Willful | Repeat | Other | Unclass | Total |
|---|---|---|---|---|---|---|
| Initial Violations | 5 | 5 | ||||
| Current Violations | 4 | 4 | ||||
| Initial Penalty | $0 | $0 | $0 | $875 | $0 | $875 |
| Current Penalty | $0 | $0 | $0 | $700 | $0 | $700 |
| FTA Penalty | $0 | $0 | $0 | $0 | $0 | $0 |
| # | Citation ID | Citaton Type | Standard Cited | Issuance Date | Abatement Due Date | Current Penalty | Initial Penalty | FTA Penalty | Contest | Latest Event | Note |
|---|---|---|---|---|---|---|---|---|---|---|---|
| 1. | 01001 | Other | 5189 F01 A | 12/05/1995 | 01/07/1996 | $175 | $175 | $0 | - | ||
| 2. | 01002 | Other | 6828 A | 12/05/1995 | 01/07/1996 | $175 | $175 | $0 | - | ||
| 3. | 01003 | Other | 6862 A | 12/05/1995 | 01/07/1996 | $175 | $175 | $0 | - | ||
| 4. | 01004 | Other | 5218 E02 A | 12/05/1995 | 01/07/1996 | $175 | $175 | $0 | - | ||
| 5. | 01005 | Other | 5218 J01 A | 12/05/1995 | 01/07/1996 | $175 | $175 | $0 | A - Amendment | Citation has been deleted. |
Investigation Summary
At the gasoline blending unit of an oil refinery, a new product lineup was performed and the equipment was started. Overpressure developed in the product line and was relieved through a pressure relief system, but it was unable to contain the hydrocarbon volume with associated loss of containment. Seventy-three employees were tested for benzene exposure, with 72 negatives and one false positive. The predominant factor leading to the incident resulted from a temperature increase with pressure increase in the downstream body of a twin seal valve, causing the guide pin to shear upon opening. The valve appeared to be open but was closed.
Keywords: BENZENE, PIN, EQUIPMENT FAILURE, GAS, HIGH PRESSURE, VALVE, GAS LEAK, SHEARED
| # | Inspection | Age | Sex | Degree of Injury | Nature of Injury | Occupation |
|---|---|---|---|---|---|---|
| 1 | 120195862 | Non Hospitalized injury | Other | Miscellaneous material moving equipment operators |