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API FINAL REPORT 1996 Document Information:
Title
Final Report 1996 American Petroleum Institute/National Petroleum Refiners Association Survey of Refining Operations and Product Quality
American Petroleum Institute
Publication Date:
Jul 1, 1997
Scope:
I. SURVEY PURPOSE
The refining industry has relied in the past on industry surveys
to collect information about current product quality and
process facilities. Given changes in crude slate, process
configurations and product specifications that have taken place since
the 1989 survey of the National Petroleum Refiners Association (NPRA),
a new survey was commissioned to provide current information.
A survey of industry refining data was conducted for the period May 1
through August 31, 1996. It includes information on
domestically produced gasoline and diesel product quality as well as
domestic refining capacity and operating data.
The blank data input forms found in Appendix G were used to
collect the necessary information. These forms were designed by
experts from the American Petroleum Institute (API) and NPRA with
input from the contractor. API and NPRA distributed these forms to
their member companies in August 1996 with instructions to complete
and return the forms to the contractor chosen for data base
management. No party other than the contractor saw the raw,
disaggregated data. The objectives of contractor were to: 1) respond
to all industry questions in regard to completing the data input
forms, 2) receive and validate the data, and 3) aggregate the data,
all the while maintaining confidentiality of individual refinery and
company information.
II. SCOPE OF WORK
The required work for this survey was divided into four tasks
as explained below:
Task 1: Tracking
The contractor was the point-of-contact for all questions about
the data input forms. While the API and NPRA each designated a
person from the association's staff to respond to questions from
the companies, all issues related to data input instructions
were resolved by the contractor, when possible.
The contractor was also responsible for advising the API which member
companies and refineries had responded to the survey. API and NPRA
staff in turn relied on this information to solicit maximum practical
participation from the industry. Information regarding the identity of
participants was not shared with API or NPRA member companies. The
data reporting period was closed on January 6, 1997.
Task 2: Data Base
As input forms were received from the refineries, the
contractor entered the data into a Paradox data base which had been
previously designed to hold and aggregate the data. Paradox is a
relational data base well-suited for multi-refinery studies of this
size. The contractor relied upon an extensive background in designing
data base systems using Paradox Application Language (PAL) to
record, calculate, and report client data.
Data validation consisted of three steps. First, all data
initially entered into the data base were independently verified for
accuracy by another individual in the contractor's office. Second,
using a statistical program, the contractor identified outlying values
for each variable. Data points outside three standard deviations of
the average were reviewed and either corrected or removed from the
data base. A third validation step consisted of comparing
Petroleum Administration for Defense District (PADD) aggregated data
from this survey with the data reported for May through August 1996 in
the Petroleum Supply Monthly issued by the Energy
Information Administration (EIA). Comparisons are noted later in this
report.
The contractor has maintained individual refinery data as confidential
information. No part of a refinery's submission will be made available
to any other party. The results of the survey have been aggregated to
eliminate the possibility that any individual refinery data might be
recognized.
Task 3: Respondents Sample Representation
To provide information on the actual representation of the
survey respondents, the contractor has calculated the percentage of
crude distillation capacity, gasoline production, and
distillate production included in the survey by PADD. These
percentages have been calculated using the information reported in
Petroleum Supply Monthly, issued by the EIA, as representative of the
entire industry for the period May through August, 1996. Summaries of
these analyses appear below.
Task 4: Data Summaries
The contractor has aggregated the data by seven (7) geographic areas:
PADDs 1 through 4 individually, PADD 5 (excluding California), the
Total United States (excluding California), and California. Each
aggregation consists of the data summarized on a set of input forms
similar to that supplied by each refinery. All aggregations are
volume-weighted averages.
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