[Code of Federal Regulations] [Title 46, Volume 1] [Revised as of January 1, 2007] From the U.S. Government Printing Office via GPO Access [CITE: 46CFR32.50-3] [Page 431] TITLE 46--SHIPPING CHAPTER I--COAST GUARD, DEPARTMENT OF HOMELAND SECURITY PART 32_SPECIAL EQUIPMENT, MACHINERY, AND HULL REQUIREMENTS--Table Subpart 32.50_Pumps, Piping, and Hose for Cargo Handling Sec. 32.50-3 Cargo discharge--TB/ALL. (a) Pumps or other acceptable means shall be used to discharge cargo from gravity type cargo tanks vented at gauge pressures of 4 pounds per square inch or less. (b) The use of compressed air as the primary means of discharging cargo from such tanks is prohibited.