[Code of Federal Regulations] [Title 46, Volume 2] [Revised as of October 1, 2004] From the U.S. Government Printing Office via GPO Access [CITE: 46CFR52.20-17] [Page 134] TITLE 46--SHIPPING CHAPTER I--COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED) PART 52_POWER BOILERS--Table of Contents Subpart 52.20_Requirements for Firetube Boilers Sec. 52.20-17 Opening between boiler and safety valve (modifies PFT-44). When a discharge pipe is used, it must be installed in accordance with the requirements of Sec. 52.01-105. [CGD 81-79, 50 FR 9434, Mar. 8, 1985]