1 / 15

2.3.9

2.3.9. Identifying Procedures for Purging Containers & Injecting Methanol Prior to Propane Transfer.

kalin
Télécharger la présentation

2.3.9

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. 2.3.9 Identifying Procedures for Purging Containers & Injecting Methanol Prior to Propane Transfer Purging containers is required because air and moisture inside a container can create conditions that generate corrosion. Corrosion will lessen the ethyl mercaptan odorant level of the propane in the customer’s distribution piping, causing a possible safety problem and hazardous situation. • In this module you will identify: • Procedures for purging propane containers • Procedures for injecting methanol into propane containers

  2. Procedures for Purging Propane Containers • Prior to placing them into propane service, the following containers should be purged of air and moisture: • New containers not vacuum purged by the manufacturer • Containers that were vacuum purged, but lose the negative pressure (vacuum) due to leakage and draw in air • Containers open to air for time longer than is needed to replace a valve or fitting

  3. Procedures for Purging Propane Containers To purge a container:

  4. Procedures for Purging Propane Containers For ASME tanks installed at customer locations, purging can be performed by connecting a pressure regulator set to approximately 15 psig output pressure, between the transport vapor equalizing hose end valve and the container vapor equalizing connection. Use a grounded, flexible LP gas hose for the run. Special attention must be given to purging operations in the field to ensure that air and propane/air mixtures expelled from the container are directed away from people, buildings, other enclosures, vehicles and any potential ignition source. A final vapor charge of 15 psig should be retained in the container before filling with liquid propane.

  5. Injecting Methanol Into Propane Containers • Characteristics of Methanol • Methanol is poisonous and should never come in contact with your skin, eyes, or mouth. You should always wear gloves and chemical splash protective face shields or goggles whenever you handle, pour or transfer methanol from one container to another.

  6. Injecting Methanol Into Propane Containers • Characteristics of Methanol • Methanol vapors in confined spaces have an effect similar to ether • Methanol must be secured in approved containers • Methanol is highly flammable • Methanol fires are difficult to see • When transferring methanol from a drum to a small container, the containers must be electrically bonded • Methanol tends to make propane flash vaporize, producing a geyser of propane and methanol • Methanol is an aggressive solvent

  7. Injecting Methanol Into Propane Containers Storing and Handling Methanol Never leave methanol in a propane transfer hose for an extended period of time.Methanol dissolves the “plasticizers” used in the bonding and curing of hose components. This may weaken the hose walls, causing separation of the material, bubbling, bulges and eventually—a hose rupture.

  8. Injecting Methanol Into Propane Containers Injecting Methanol into New Vacuum-Purged Containers Figure 2. New Vacuum Purged UG Tank

  9. Injecting Methanol Into Propane Containers Injecting Methanol into New Vacuum-Purged Containers Figure 3. Vacuum Transfer of Methanol

  10. Injecting Methanol Into Propane Containers Injecting Methanol into New Vacuum-Purged Containers In order to avoid air entering the tank during the methanol transfer, the hose in the methanol container must go all the way to the bottom of the container and the service valve on the tank should be closed before the methanol level gets to the level of the hose opening.

  11. Injecting Methanol Into Propane Containers Injecting Methanol into Pressurized Containers Methanol can be injected into containers by using a short length of propane hose with a female ACME connector installed on the container filler valve, while a male ACME connector on the other end is secured to the bulk truck delivery hose end valve adapter. Propane in the delivery hose forces the methanol into the container when the hose end valve is opened.

  12. Injecting Methanol Into Propane Containers Injecting Methanol into Pressurized Containers

  13. Injecting Methanol Into Propane Containers Injecting Methanol into Pressurized Containers

  14. Injecting Methanol Into Propane Containers Injecting Methanol into Pressurized Containers

  15. Time to See If You Got the Key Points of This Module… • Complete the Review on page ?. • See if you are ready for the Certification Exam by checking off the performance criteria on page ?.

More Related