Exam (elaborations)
Safe Dispensing of Propane Exam Questions and Answers 2024
- Course
- Institution
Safe Dispensing of Propane Exam Questions and Answers
[Show more]
Content preview
Safe Dispensing of Propane Exam Questions and AnswersName 3 characteristics of propane - Answer- colorless, odorless, tasteless
What is the initial boiling point of propane - Answer- -44 degrees
What does one gallon of liquid propane weigh in pounds - Answer- 4.2 pounds
How heavy is propane vapor compared to air? Propane liquid to water? - Answer- 1.5 > 1. 1 and 1/2 more than air (SO4 < H20)
What is the limit of flammability in air, percent of vapor in air/gas mixture? - Answer- 2.15%-9.6%
What is the most commonly used odorant in LP gases and why is it added? - Answer- Ethynl Mercaptan
When liquid propane is released to the atmosphere, what is it's expansion ratio? - Answer- 25%
Is propane non-toxic? - Answer- Yes
Name several potential sources of ignition? - Answer- Fans, switches, car ignitions, static, cigs.
When the outside temperature increases, what happens to propane inside a container? - Answer- Increase pressure
Name THREE types of specifications which propane containers are manufactured under. - Answer- Container info/ filling connections valves/ product storage area
What does DOT stand for? ASME? FAA? - Answer- Department of Transportation, American Society of Mech. Engineering, Federal Aviation Admin.
How long after manufacture may a DOT Steel or Aluminum cylinder be used before re-
certification is required? How many re-certifications are allowed? - Answer- 12 years, every 5, 7, 12 years (as many as you want). How long after manufacture may a DOT Composite cylinder be used before re-
certification is required? - Answer- 5 years and every 5 years after 15 year max
Where is the identification information found on a DOT cylinder? On an ASME tank? - Answer- DOT: Collar/ Neck Ring/ Body. ASME: Data Plate
If an ASME container does not have a data plate, but appears to be in good condition, can it be filled? - Answer- NO
Can a licensed dispensing unit operator re-qualify DOT cylinders for continued use? - Answer- NO
Name 3 types of re-qualification that can determine if a DOT cylinder is acceptable for safe continued use. - Answer- External visual inspection, proof pressure method, volumetric expansion method.
The cylinder marking 4BW-240 tells you what? - Answer- 4bw- cylinder specification type
240- cylinder service pressure
How does a back flow check valve work? - Answer- Always close unless fuel from outside forces open
What is the purpose of a relief valve? - Answer- Release vapor pressure to atomsphere to maintain pressure inside container
What information does a fixed liquid level gauge give you? - Answer- When the tank is 80% full
What should a vapor service valve (POL) be equipped with when disconnected? - Answer- Plug or Cap
What does the excess flow in a liquid service valve do? - Answer- Permits flow of gas in
either direction/ closes when flows too fast
What is an OPD and what is its purpose? - Answer- Overfill prevention device/ prevents overfilling
Can you rely on an OPD valve for accurate filling of a DOT cylinder - Answer- NO
Is the float gauge alone a suitable method for filling - Answer- NO
What must be done before a new DOT container may be filled - Answer- Purge
Before filling a motor home, what steps should you take? - Answer- Motor off, brakes set, passengers out
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller millyphilip. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $10.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
77333 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now