CFR /  Title 33  /  Part 137  /  Sec. 137.20 May industry standards be used to comply with this

The industry standards in ASTM E 1527-05, (Referenced in Sec. 137.15) may be used to comply with the requirements set forth in Secs. 137.45 through 137.85 of this part. Use of ASTM E 1527-05 for this purpose is optional and not mandatory.