Sgov Calculator

Specific Gravity of Oil (SGOV) Calculator

Standard density of water at 4°C is 1.0 g/mL.
OR
Enter API Gravity to convert to Specific Gravity.

Results

Specific Gravity (SG): –

Oil Density (g/mL): –

API Gravity (°API): –

function calculateSGOV() { var oilMass = parseFloat(document.getElementById('oilMass').value); var oilVolume = parseFloat(document.getElementById('oilVolume').value); var waterDensity = parseFloat(document.getElementById('waterDensity').value); var apiGravityInput = parseFloat(document.getElementById('apiGravityInput').value); var errorMessage = document.getElementById('errorMessage'); errorMessage.innerHTML = "; // Clear previous errors var resultSG = document.getElementById('resultSG'); var resultOilDensity = document.getElementById('resultOilDensity'); var resultAPIGravity = document.getElementById('resultAPIGravity'); resultSG.innerHTML = '-'; resultOilDensity.innerHTML = '-'; resultAPIGravity.innerHTML = '-'; var calculatedSG = NaN; var calculatedOilDensity = NaN; var calculatedAPIGravity = NaN; // Prioritize calculation from Mass and Volume if (!isNaN(oilMass) && !isNaN(oilVolume) && oilVolume > 0 && !isNaN(waterDensity) && waterDensity > 0) { calculatedOilDensity = oilMass / oilVolume; calculatedSG = calculatedOilDensity / waterDensity; if (!isNaN(calculatedSG) && calculatedSG > 0) { calculatedAPIGravity = (141.5 / calculatedSG) – 131.5; } } else if (!isNaN(apiGravityInput)) { // Fallback to API Gravity conversion calculatedSG = 141.5 / (apiGravityInput + 131.5); calculatedAPIGravity = apiGravityInput; if (!isNaN(calculatedSG) && calculatedSG > 0 && !isNaN(waterDensity) && waterDensity > 0) { calculatedOilDensity = calculatedSG * waterDensity; } } else { errorMessage.innerHTML = 'Please enter valid numbers for Mass and Volume of Oil, or API Gravity.'; return; } if (!isNaN(calculatedSG)) { resultSG.innerHTML = calculatedSG.toFixed(4); } else { errorMessage.innerHTML = 'Could not calculate Specific Gravity. Please check your inputs.'; return; } if (!isNaN(calculatedOilDensity)) { resultOilDensity.innerHTML = calculatedOilDensity.toFixed(4); } else { resultOilDensity.innerHTML = 'N/A (requires Mass/Volume or SG and Water Density)'; } if (!isNaN(calculatedAPIGravity)) { resultAPIGravity.innerHTML = calculatedAPIGravity.toFixed(2) + ' °API'; } else { resultAPIGravity.innerHTML = 'N/A (requires SG)'; } }

Understanding Specific Gravity of Oil (SGOV)

The Specific Gravity of Oil (SGOV) is a crucial parameter in the petroleum industry, providing a standardized measure of an oil's density relative to water. It's a dimensionless quantity that helps classify crude oils, predict their behavior, and is essential for various engineering and commercial applications.

What is Specific Gravity?

Specific Gravity (SG) is defined as the ratio of the density of a substance to the density of a reference substance. For liquids like oil, the reference substance is typically water at a standard temperature (usually 4°C, where its density is approximately 1.0 g/mL or 1000 kg/m³). A specific gravity less than 1.0 means the oil is lighter than water and will float, while a specific gravity greater than 1.0 means it's heavier and will sink.

Why is SGOV Important?

  • Crude Oil Classification: SGOV, or its related measure API Gravity, is a primary factor in classifying crude oils as light, medium, or heavy. This classification impacts pricing, refining processes, and transportation methods.
  • Transportation and Storage: Knowing the specific gravity helps in designing storage tanks, pipelines, and transportation vessels, as it affects buoyancy, pressure, and volume calculations.
  • Refining Processes: Refineries use SGOV to optimize distillation and cracking processes, as different crude oil densities yield varying proportions of refined products like gasoline, diesel, and asphalt.
  • Environmental Response: In the event of an oil spill, SGOV helps predict how the oil will behave in water (float, disperse, or sink), guiding cleanup efforts.

Specific Gravity vs. API Gravity

While Specific Gravity is a direct ratio, the American Petroleum Institute (API) Gravity is a related, inverse measure commonly used in the oil industry. API Gravity is expressed in degrees (°API) and is calculated from specific gravity using the following formula:

API Gravity = (141.5 / Specific Gravity) – 131.5

Conversely, Specific Gravity can be derived from API Gravity:

Specific Gravity = 141.5 / (API Gravity + 131.5)

Higher API Gravity values indicate lighter crude oils, while lower values (or even negative values for very heavy oils) indicate heavier crude oils. Most crude oils range between 20°API and 45°API.

How to Use the SGOV Calculator

This calculator allows you to determine the Specific Gravity of Oil using two primary methods:

  1. From Mass and Volume: If you know the mass of an oil sample (in grams) and its corresponding volume (in milliliters), the calculator will first determine the oil's density and then its specific gravity relative to a reference water density (defaulting to 1.0 g/mL for water at 4°C).
  2. From API Gravity: Alternatively, if you already have the API Gravity of the oil, you can input this value directly to convert it into Specific Gravity. The calculator will also show the equivalent oil density based on the reference water density.

Example Calculation:

Let's say you have an oil sample with a mass of 850 grams and a volume of 1000 mL. Using the standard water density of 1.0 g/mL:

  1. Calculate Oil Density:
    Oil Density = Mass of Oil / Volume of Oil = 850 g / 1000 mL = 0.85 g/mL
  2. Calculate Specific Gravity:
    Specific Gravity = Oil Density / Reference Water Density = 0.85 g/mL / 1.0 g/mL = 0.85
  3. Calculate API Gravity:
    API Gravity = (141.5 / 0.85) – 131.5 = 166.47 – 131.5 = 34.97 °API

This indicates a relatively light crude oil. Use the calculator above to quickly perform these calculations for your specific oil samples.

Leave a Reply

Your email address will not be published. Required fields are marked *