the repair department. In either case, the diving and salvage  officer  is  responsible  for  the  supervision  of  all diving  operations,  the  maintenance  of  diving  and salvage  equipment,  and  compliance  with  diving instructions  and  precautions. Gas Free Engineer The   hull   repair   officer   is   generally   assigned additional  duty  as  the  gas  free  engineer.  His  primary responsibility  is  to  ensure  compliance  with  all precautions  set  forth  by  NAVSEA;   U.S.  Safety Precautions For Shore Acclivities, NAVMAT P-5100; ship’s  regulations;  and  other  regulations  issued  by higher authority. He determines whether there is danger to personnel or equipment from noxious or explosive gases during any operation aboard ship or during work on  ships  alongside,  and  stops  such  work  when necessary. Enlisted Personnel Navy  enlisted  personnel  provide  the  technical  skills required aboard IMAs. The Occupational Standards, NAVPERS  18068,  contain  detailed  information  on  the enlisted rating structure. ARRIVAL  CONFERENCE An  arrival  conference  is  usually  held  immediately when a ship begins an IMA availability or an upkeep period.  Representatives  of  the  ship,  of  the  repair department, and usually of the TYCOM attend the conference. They discuss the relative needs of the ship and the urgency of each job and approve/disapprove work requests, clarify uncertainties, and arrange for temporary services such as electricity and steam. SHIP/IMA WORK COORDINATION Ship’s engineering personnel must know the status of work underway during an IMA availability whether that work is being done by the ship’s force or the IMA. You need this information to coordinate your own work with that being done by the IMA. There are three basic kinds of work that require coordination: (1) Equipment removed by the ship’s force to be delivered to the IMA for repair, (2) equipment dismantled by the ship’s crew so they can send parts to the IMA for repair (also known as  ship-to-shop  jobs),  and  (3)  repairs  the  IMA  force  is making on the ship. The IMA usually appoints a ship superintendent, a chief  petty  officer  who  should  always  know  the  status of all jobs on the ship and on the IMA. If the IMA does not appoint a ship superintendent, then the ship should appoint a petty officer for that purpose. The person in this position is liaison between the ship and the IMA for all  work  in  progress  and  completed,  and  all  tests required  and  completed.  He  keeps  a  daily  running progress report of each job and reports that information daily  to  the  ship’s  representative. REPAIR DEPARTMENT You need a general idea of the shops composing the repair department and their functions. In this section, we will describe the shops as they are organized in the divisions  on  a  destroyer  tender  (AD),  which  is representative of all IMAs. Hull Repair Division The hull repair division consists of the shipfitter shop, the sheet metal shop, the pipe and copper shop, the weld shop, the carpenter shop, the diving locker, and the canvas shop. We will explain each of them in the following   sections. SHIPFITTER SHOP.— These personnel make repairs on the hull, test pad eyes and structures with a dynamometer, and handle alterations designated for forces  afloat. SHEET METAL SHOP.— These personnel make all types of repairs and fabrications on light gauge sheet metal and handle alterations designated for forces afloat. PIPE AND COPPER SHOP.— These  personnel fabricate and repair most pipe and tubing, test completed work  hydrostatically,  and  handle  alterations  designated for  forces  afloat. WELD  SHOP.—   These  personnel  weld  most metals including high-pressure welding on boilers. They repair castings, stress relieve castings and forgings, forge special tools and hull fittings, and case harden low-carbon  steel.  (NOTE: The  nondestructive  testing laboratory  performs  all  nondestructive  testing  used  to test  the  quality  of  the  welds.) CARPENTER SHOP.—  These  personnel  repair and fabricate most items made of wood; test damage control air test equipment, flame safety lamps, and explosion  meters;  lay  linoleum  tile,  magnetite,  and terrazzo covers on decks; and fill  C02,  bottles. The pattern  shop  functions  under  the  carpenter  shop  and fabricates  patterns  of  wood,  metal,  and  plastic  for templates  and  foundry  castings. 9-5