Interpretation Response #98-0286 ([Polar Service Centers] [Mr. Mark Hughes])
Below is the interpretation response detail and a list of regulations sections applicable to this response.
Interpretation Response Details
Response Publish Date:
Company Name: Polar Service Centers
Individual Name: Mr. Mark Hughes
Location State: SC Country: US
View the Interpretation Document
Response text:
JUL 2, 1999
Mr. Mark Hughes Ref. No. 98-0286
Polar Service Centers
120 Cedar Springs Road
Spartansburg, SC 29302
Dear Mr. Hughes:
This is in response to your letter dated September 21, 1998 and further clarifies our letter of September 4, 1998, regarding a suitable corrosion allowance for sulfuric acid in MC 307 cargo tanks under the Hazardous Materials Regulations (HMR; 49 CFR Parts 171-180). Specifically you asked whether a certain unlined 316 SS MC 307 cargo tank approved for sulfuric acid in all concentrations meets the allowance specified in special provision B84 (172.102).
Special provision B84 applies only to sulfuric acid in concentrations up t 65.25% and does not apply to concentrations greater than 65.25%. The requirements for non-metallic lining or a suitable corrosion allowance as stated in special provision B84 do not apply to sulfuric acid in concentrations above 65.25%.
In reference to the September 4, 1998 letter we sent you, we assumed that the original design minimum thickness was not greater than 3/16". The cargo tank designer’s calculated minimum thickness and the designer’s corrosion allowance should be used to determine whether or not the remaining corrosion allowance is suitable.
I hope this satisfies your request.
Sincerely,
Delmer F. Billings
Chief, Standards Development
Office of Hazardous Materials Standards
172.102
Regulation Sections
| Section | Subject |
|---|---|
| 172.102 | Special provisions |