# -16 Attachments.

- **operation:** document
- **citation:** 49 CFR 179.100-16
- **title:** -16 Attachments.
- **source type:** regulation
- **agency:** Pipeline and Hazardous Materials Safety Administration
- **status:** current
- **official:** true
- **published on:** Not available
- **effective on:** 2026-08-18
- **summary:** (a) Reinforcing pads must be used between external brackets and shells if the attachment welds exceed 6 linear inches of 1/4-inch fillet or equivalent weld per bracket or bracket leg. When reinforcing pads are used, they must not be less than one-fourth inch in thickness, have each corner rounded to
- **machine formats:** - **json:** https://regulus.evalyn.ai/document/49-cfr-179-100-16.json
- **markdown:** https://regulus.evalyn.ai/document/49-cfr-179-100-16.md
- **app url:** https://regulus.evalyn.ai/document/49-cfr-179-100-16
- **source url:** https://www.ecfr.gov/on/2026-08-18/title-49/section-179.100-16
**body:**

(a) Reinforcing pads must be used between external brackets and shells if the attachment welds exceed 6 linear inches of 1/4-inch fillet or equivalent weld per bracket or bracket leg. When reinforcing pads are used, they must not be less than one-fourth inch in thickness, have each corner rounded to a 1-inch minimum radius, and be attached to the tank by continuous fillet welds except for venting provisions. The ultimate shear strength of the bracket-to-reinforcing pad weld must not exceed 85 percent of the ultimate shear strength of the reinforcing pad-to-tank weld.

(b) Attachments not otherwise specified shall be applied by approved means.

[29 FR 18995, Dec. 29, 1964. Redesignated at 32 FR 5606, Apr. 5, 1967, and amended by Amdt. 179-10, 36 FR 21346, Nov. 6, 1971]
- **truncated:** false
- **body characters:** 778