Interpretation Response #98-0596 ([Fort Edward Express Co., Inc.] [Mr. Douglas J. Varney])
Below is the interpretation response detail and a list of regulations sections applicable to this response.
Interpretation Response Details
Response Publish Date:
Company Name: Fort Edward Express Co., Inc.
Individual Name: Mr. Douglas J. Varney
Location State: NY Country: US
View the Interpretation Document
Response text:
JUN 3, 1998
Mr. Douglas J. Varney
Service Manager
Fort Edward Express Co., Inc.
Fort Edward, NY 12828
Dear Mr . Varney:
This is in response to your letter regarding the pressure relief devices for an MC-331 cargo tank operated in dedicated chlerosilane service under the Hazardous Materials Regulations (HMR; 49 CFR Parts 171-180). Specifically, you ask if it is allowable to install a pressure relief device rated at 250 psig in a cargo tank that is in dedicated chlorosilane service having design pressure of 312.5 psig stamped on the tank specification plate. I apologize for the delay in responding and hope it has not caused any inconvenience.
The specifications for a pressure relief device in an MC-331 cargo tank are found in 49 CFR 178.337-9(a). Section 178.337-9(a)(3) states that each valve must be designed, constructed, and marked for a rated pressure not less than the' cargo tank design pressure at the
temperature to be encountered. Therefore, it is not allowable to install a pressure relief device rated at 250 psig in a cargo tank in dedicated chlorosilane service having a 312.5 psig design pressure marked on the cargo tank specification plate.
I hope this satisfies your request.
Sincerely,
Delmer F. Billings
Chief, Standards Development
Office of Hazardous Materials Standards
178.337, 173.315