This document provides questions and answers about using a Saybolt Viscometer to determine the viscosity of petroleum samples. It defines Saybolt Universal Viscosity and Saybolt Furol Viscosity as the efflux time in seconds for a sample to flow through a calibrated orifice and fill a 60-ml receiving flask under controlled temperature conditions. The key components of the Saybolt Viscometer are identified as the thermometer, timer, cork/rubber stopper, receiving flask, and universal or furol orifice.

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MET 211-L : APPLIED THERMODYNAMICS LABORATORY
Lab Ex. No. : 2
Title : Determination of Saybolt Viscosity
Practical questions involving the use of Saybolt Viscometer:
Question 1 What is the use of the thermometer in the Saybolt Viscometer?
Answer:
a. To measure the temperature of the oil sample.
b. To monitor the temperature of the oil sample at a required fixed value.
Question 2 What is the function of the stirrer paddles inside the oil bath of the Saybolt
Viscometer?
Answer: To maintain a uniform temperature of the oil bath.
Question 3 Why do you need to stir the oil sample inside the cylinder?
Answer: To maintain a uniform temperature.
Question 4 Up to what level do you have to fill the cylinder with oil sample?
Answer: Fill the test cup up to the line or groove.
Question 5 What is the function of the heater in the viscometer?
Answer: Heat the test sample during calibration.
Question 6 What is the function of the 60-ml receiving flask?
Answer: To measure the volume of oil sample up to 60-ml mark.
Question 7 Define Saybolt Universal Viscosity
Answer: It is the efflux time in seconds of sample flowing through a calibrated universal orifice to fill up
the 60-ml receiving flask under carefully controlled specified conditions.
Question 8 Define Saybolt Furol Viscosity
Answer: It is the efflux time in seconds of sample flowing through a calibrated furol orifice to fill up the
60-ml receiving flask under carefully controlled specified conditions.
Question 9 What should be the calibrated temperature of petroleum sample for universal orifice?
Answer: 37.8 °C.
Question 10 What should be the calibrated temperature of petroleum sample for furol orifice?
Answer: 50.0 °C.
Question 11 What is the objective of this laboratory exercise?
Answer: To determine the viscosity of a certain petroleum sample using Saybolt Viscometer.

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Question 12 What is the function of the timer in this laboratory exercise?
Answer: To measure the efflux time for the sample to fill the 60-ml receiving flask.
Question 13 What are the two types of orifices used when using Saybolt Viscometer?
Answer:
a. Universal orifice
b. Furol orifice
Question 14 What is the meaning of (a) SUV? (b) SFV?
Answer:
a. SUV – Saybolt Universal viscosity
b. SFV – Saybolt Furol viscosity
Question 15 What is the unit of viscosity for Saybolt viscometer?
Answer: Seconds – SUS or SFS
Table of Components:
No. Name of Item
1 Thermometer
2 Thermometer support
3 Timer
4 Cork/Rubber stopper
5 60-ml Receiving flask
6 Orifice (Universal /Furol)
1
2
3
5
4
6