Baseline data

This section will look at formation and fluid data gathering before significant amounts of fluid have been produced hence describing how the static reservoir is sampled. Data gathered prior to production provides vital information, used to predict reservoir behaviour under dynamic conditions. Without this baseline data no meaningful reservoir simulation can be carried out. The other major benefit of data gathered at initial reservoir conditions is that pressure and fluid distribution are in equilibrium this is usuaily not the case once production commences. Data gathered at initial conditions is therefore not complicated... 

A proper assessment of the costs and benefits associated with standardization depends on having suitable baseline data with which to make a comparison. Several surveys have shown typical doUat returns for the investment in standardization in the range of 5 1—8 1 with occasional claims made for a ratio as high as 50 1. 

Releases to Air. In April 1989, you conducted stack tests to determine air releases from the battery facility. The release data provided baseline data for a proposed 1990 air emission reduction program. The tests were performed using EPA Reference Method 12, which determines exhaust concentrations as total elemental lead, and EPA Reference Methods 1-4, which determine total exhaust volumes. Releases from all stacks and vents at the facility were measured, including those from the following release points ... 

Which measures you actually use will partly depend on the objectives of your integration program. You should be checking that the expected benefits of integration are being achieved. If improved efficiency was a key objective, it will be important to develop and collect measures of efficiency as early as possible. When selecting measures of efficiency, you should make sure you have baseline data from before the implementation of the integration project. If you don t have such baseline data, the full benefits of the project will never become apparent. 

A standard test probe is not absolutely necessary to monitor the column. Any well-resolved peak in the sample may be used. To use a sample component, baseline data must be established when the column is new and performing well. After establishing that the column is performing properly using the manufacturer s standard test procedure, calculate the assymetry factor, theoretical plates, and resolution of one or more of the sample components. Also note the retention time. This will become the baseline test mix, which will be used for later comparison. 

Comparative analysis directly compares two or more data sets in order to detect changes in the operating condition of mechanical or process systems. This type of analysis is limited to the direct comparison of the time-domain or frequency-domain signature generated by a machine. The method does not determine the actual dynamics of the system. Typically, the following data are used for this purpose (1) baseline data, (2) known machine condition, or (3) industrial reference data. 

Note that great care must be taken when comparing machinery vibration data to industry standards or baseline data. The analyst must make sure the frequency and amplitude are expressed in units and running speeds that are consistent with the standard or baseline data. The use of a microprocessor-based system with software that automatically converts and displays the desired terms offers a solution to this problem. 

Reference or baseline data sets should be acquired for each machine-train or process system to be included in a predictive maintenance program when the machine is installed or after the first scheduled maintenance once the program is established. These data sets can be used as a reference or comparison for all future measurements. However, such data sets must be representative of the normal operating condition of each machine-train. Three criteria are critical to the proper use of baseline comparisons reset after maintenance, proper identification, and process envelope. 

The baseline data set must be updated each time the machine is repaired, rebuilt, or when major maintenance is performed. Even when best practices are used, machinery cannot be restored to as-new condition when major maintenance is performed. Therefore, a new baseline or reference data set must be established following these events. 

Each reference or baseline data set must be clearly and completely identified. Most vibration-monitoring systems permit the addition of a label or unique identifier to any user-selected data set. This capability should be used to clearly identify each baseline data set. 

In addition, the data-set label should include all information that defines the data set. For example, any rework or repairs made to the machine should be identified. If a new baseline data set is selected after the replacement of a rotating element, this information should be included in the descriptive label. 

Three types of reference-value comparisons are used to evaluate trend data baseline data, rate of change, and industrial standards. 

A series of baseline or reference data sets should be taken for each machine-train included in a predictive-maintenance program. These data sets are necessary for future use as a reference point for trends, time traces, and FFT signatures that are collected over time. Such baseline data sets must be representative of the normal... 

Since variations in process variables, such as load, have a direct effect on the vibration energy and signature generated by a machine-train, the actual operating envelope for each baseline data set must also be clearly identified. If this step is omitted, direct comparison of other data to the baseline will be meaningless. The label feature in most vibration monitoring systems permits tagging the baseline data set with this additional information. 

As a minimum, your baseline data set should include the labor, overhead, overtime premiums and other payroll costs of the maintenance department. It should also include all maintenance related contract services, excluding janitorial, and the total costs of spare parts inventories. The baseline should also include the percentage of unscheduled maintenance repairs versus scheduled actual repair costs on critical plant equipment and the annual availability of the plant. 

During the implementation stage of a predictive maintenance program, all classes of machinery should be monitored to establish a valid baseline data set. Full vibration... 

The standards for conventional or non-RFG gasoline are shown in Table 10-2. Oil companies can choose to comply with the requirements on either a per-gallon baseline or the company s 1990 baseline. If there is an incremental volume of fuel above the 1990 production rate, the baseline will be adjusted using the industry s baseline data (see Table i0-.i). The industry s baseline gasoline is an average of properties of all the U.S. gasoline marketed in 1990. 

The nurse obtains the vital signs at die time of the initial assessment to provide baseline data. The primary healtii care provider may order many laboratory and diagnostic tests, such as an electroencephalogram, computed tomographic scan, complete blood count, and hepatic and renal function tests to confirm the diagnosis and identify a possible cause of the seizure disorder, as well as to provide a baseline during therapy with anticonvulsants. 

The primary health care provider may also order laboratory and diagnostic tests, renal and hepatic function tests, complete blood count, serum enzymes, and serum electrolytes. The nurse reviews these test results before the first dose is given and reports any abnormalities to the primary health care provider. The patient is usually placed on a cardiac monitor before aiitiarrhytiuiric drug therapy is initiated. The primary health care provider may order an ECG to provide baseline data for comparison during therapy. 

Before administering the first dose of heparin, the nurse obtains the patients vital signs. The most commonly used test to monitor heparin is activated partial thromboplastin time (APTT). Blood is drawn for laboratory studies before giving the first dose of heparin to obtain baseline data (See the discussion on preadministration assessment for the oral anticoagulants.)... 

Burg JE, Gist GL, Allred SL, et al. 1995. The national exposure registry - morbidity analysis of noncancer outcomes from the trichloroethylene subregistry baseline data. International Journal of Occupational Medicine and Toxicology 4 237-257. 

The storage modulus (G ) was recorded at a frequency of IHz under 0.015 strain amplitude until stabilization of the protein network. In order to reduce stress in the sample, G recording started just before the gelation time which corresponds to the time at which G deviated from the baseline. Data were collected and rheological parameters were calculated using Carri-Med 50 software. For each system, the experiments were performed in triplicate. 

Demographics and Trial-Specific Baseline Data 27 Concomitant or Prior Medication Data 27 Medical History Data 29 Investigational Therapy Drug Log 30 Laboratory Data 31 Adverse Event Data 32 Endpoint/Event Assessment Data 35 Clinical Endpoint Committee (CEC) Data 36 Study Termination Data 37 Treatment Randomization Data 38 Quality-of-Life Data 40... 

Categorical Data and Why Zero and Missing Results Differ Greatly 102 Performing Many-to-Many Comparisons/Joins 106 Using Medical Dictionaries 108 Other Tricks and Traps in Data Manipulation 112 Common Analysis Data Sets 118 Critical Variables Data Set 118 Change-from-Baseline Data Set 118 Time-to-Event Data Set 121... 

Program 4.14 Creating a Blood Pressure Change-from-Baseline Data Set... 

Comparative Toxicokinetics. The toxicokinetics database is wholly inadequate with respect to comparing toxicokinetics across species, largely because of the dearth of baseline data regarding absorption, distribution, metabolism, and excretion in any species after exposure to mineral oil hydraulic fluids, organophosphate ester hydraulic fluids, or polyalphaolefin hydraulic fluids. Also, no studies were located on the toxicokinetic properties of hydraulic fluids in humans. 

Selected conditions and results are shown in Table 2 that are representative of the catalyst performance. Continuous testing of the Ni/Re catalyst compared favorably with the baseline data generated for this catalyst in the batch reactor screening. At 200°C, the overall activity of the catalyst appeared slightly higher in the continuous reactor, achieving 94% conversion at a weight hourly space velocity of 2.5hr 1 (g xylitol/g catalyst/h) and 200°C compared to 88% conversion at an equivalent exposure in the batch reactor of 2.1 hr"1 (g xylitol/g catalyst/h) achieved at the 4 hour sample at 200°C. 

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