LPD-1

                     SHIP SYSTEMS ISE ADVISORY NO. 001-81                       
                                                                                
                                                                                
                HIGH PRESSURE WATER JET CLEANING (HYDROBLAST)                   
                       OF SHIPBOARD SEWAGE COLLECTION,                          
                   HOLDING AND TRANSFER (CHT) SYSTEM PIPING                     
                                                                                
                                                                                
                  NAVSSES PHILADELPHIA PA MSG 292133Z  JAN 81                   
                                                                                
                                                                                
 REF:            A.      CNO WASHINGTON, DC 222221Z JAN 81 (NOTAL)              
                                                                                
                                                                                
 l.      IN RESPONSE TO AGENDA ITEM SEWAGE DISPOSAL 8-80 FROM THE AT-           
 LANTIC FLEET HM&E CONFERENCE, THE TEXT OF NAVSSES SHIP SYSTEM ISE              
 ADVISORY 1-80 IS RETRANSMITTED:                                                
                                                                                
 "1.     CLOGGING OF URINAL AND WATER CLOSET DRAIN PIPING ON US NAVY            
 SHIPS IS A RECURRING MAINTENANCE PROBLEM, RECENTLY ACCENTUATED BY              
 THE INSTALLATION OF SEWAGE COLLECTION, HOLDING AND TRANSFER (CHT)              
 SYSTEMS.  OPTIMIZATION OF SEWAGE HOLDING TIMES REQUIRED INTERMITTENT           
 FLUSHING WITH RELATIVELY LOW VOLUMES OF SALT WATER.  CHT SYSTEM                
 OPERATIONAL EXPERIENCE INDICATES THAT A CHEMICAL SCALE (CALCIUM                
 CARBONATE) PRECIPITATES OUT OF THE SALT WATER MIXTURE AND DEPOSITS             
 ON THE INTERIOR SURFACE OF THE SOIL DRAINS AND MAINS.  THE PROBLEM IS          
 THEREFORE MORE PREVALENT IN THE SOIL DRAINS FROM URINALS AND WATER             
 CLOSETS:  HOWEVER, IT IS NOT LIMITED TO THESE DRAINS.  THE UNINHIBITED         
 COLLECTION OF THIS CHEMICAL SCALE IN THE CHT SYSTEM PIPING OVER AN             
 EXTENDED PERIOD CAUSES SEVERE BLOCKAGES.  LOSSES OF SOILPIPING CROSS-          
 SECTIONAL AREAS AS HIGH AS 75 PERCENT HAVE BEEN REPORTED IN DRAIN              
 MAIN OF 4".  THIS BUILDUP OF SCALE HAS IN MANY CASES TAKEN PLACE               
 WITHIN A TWO-TO THREE-YEAR SPAN OF TIME.                                       
                                                                                
 2.      CONVENTIONAL METHODS OF CLEARING THE BLOCKAGE IN THESE PIPING          
 SYSTEM UTILIZING PLUNGERS, PLUMBING SNAKES, FIREMAIN HOSE PRESSURE             
 ETC., HAVE PROVEN TO BE INEFFECTIVE AND PROVIDED ONLY TEMPORARY                
 CORRECTION.  CLEANING WITH ACID SUCH AS SULFAMIC ACID OR MECHANI-              
 CAL CLEANING WITH DEVICES SUCH AS "ROTO ROOTER" HAVE NOT BEEN COST-            
 EFFECTIVE OR EFFICIENT.                                                        
                                                                                
 3.      AT THE PRESENT TIME THE MOST COST-EFFECTIVE AND EFFICIENT MEANS        
 OF REMOVING SCALE BUILDUP FROM THE CHT PIPING SYSTEM IS USING A, 10,000        
 PSI, 20GPM WATER JET PROCEDURE (HYDROBLAST) SIMILAR TO THAT EM-                
 PLOYED TO CLEAN BOILER TUBES.  THIS METHOD HAS BEEN DEVELOPED OVER             
 THE PAST TWO YEARS BY NAVSSES AND HAS BEEN USED TO EFFECTIVELY                 
 CLEAN THE CHT PIPING SYSTEMS IN USS RALEIGH (LPD-1), USS JOSEPHUS              
 DANIELS (CG-27), USS VIRGINIA (CGN-38), USS SOUTH CAROLINA (CGN-37), USS       
 SURIBACHI (AE-21), USS FAIRFAX COUNTY (LST-1193) AND USS WICHITA (AOR-1).      
 THE SYSTEMS IN THESE SHIPS WERE CLEANED BY SIMAS AND BY CONTRACTOR             
 PERSONNEL UNDER THE TECHNICAL GUIDANCE OF NAVSSES.  OTHER SHIPS ARE            
 CURRENTLY IN PROCESS OF HAVING THE CHT SYSTEM CLEANED BY THIS                  
 METHOD WITH THE WORK BEING ACCOMPLISHED BY SHIP'S FORCE OR SHIP-               
 YARD PERSONNEL UNDER THE SUPERVISION OF NAVSSES.                               
                                                                                
 4.      THE PREREQUISITE TO SATISFACTORY, COST-EFFECTIVE HYDROBLAST            
 CLEANING OF THE CHT SYSTEM PIPING IS ADEQUATE PLANNING.  THE PLAN-             
 NING INCLUDES A SHIPCHECK TO TRACE OUT THE SOIL DRAIN SYSTEM TO                
 DETERMINE IF THE SYSTEM CONFIGURATION MEETS THE REQUIREMENTS FOR               
 HYDROBLAST CLEANING.  THE PLANNING SHIPCHECK INCLUDES RECOMMEN-                
 DATIONS FOR PIPE FITTING REPLACEMENT, CLEANOUT INSTALLATION AND                
 OTHER MODIFICATIONS AS REQUIRED TO FACILITATE THE HYDROBLAST                   
 CLEANING OPERATION.  THE PLANNING PHASE MUST BE SCHEDULED FOR                  
 ACCOMPLISHMENT FAR ENOUGH IN ADVANCE OF THE SCHEDULED HYDRO-                   
 BLAST CLEANING TO ALLOW SUFFICIENT LEAD TIME FOR PROCUREMENT AND               
 INSTALLATION OF FITTINGS AND CLEANOUTS AS REQUIRED.                            
                                                                                
 5.      PRESENT PLANS CALL FOR NAVSSES (FORMERLY NAVSEC PHILADELPHIA,          
 PA) TO TRAIN AND CERTIFY SIMA, IMA AND CONTRACTOR PERSONNEL ON                 
 BOTH THE EAST AND WEST COAST TO ACCOMPLISH HYDROBLAST CLEANING OF              
 CHT SYSTEM PIPING. PLANS ALSO INCLUDE NAVSEA/NAVSSES PROCUREMENT               
 OF ADDITIONAL CHT HYDROBLAST EQUIPMENT FOR SIMA'S AND IMA'S.  IN THE           
 INTERIM HYDROBLAST CLEANING OF CHT SYSTEM PIPING WILL BE ACCOM-                
 PLISHED UTILIZING THE WATER JET UNITS PROVIDED FOR CLEANING BOILER             
 TUBES.                                                                         
                                                                                
 6.      PENDING NAVSEA ESTABLISHMENT OF A HYDROBLAST CLEANING TRAIN-           
 ING PROGRAM, ALL CHT SYSTEMS HYDROBLASTING IS TO BE ACCOMPLISHED               
 UNDER THE DIRECTION OF NAVSSES CODE 031D.  POINT OF CONTACT FOR                
 TECHNICAL DIRECTION/GUIDANCE FOR HYDROBLAST-CLEANING CHT PIPING                
 SYSTEMS IS MR. A GEYER, CODE 031D, A/V 443-4128/3058/3922, COMMERCIAL          
 (215) 755-4128/3058/3922."                                                     
                                                                                
 2.      THE STATUS OF THE HYDROBLAST PROGRAM SINCE THE ISSUANCE OF ISE         
 ADVISORY 1-80 IS AS FOLLOWS:  THE USS MOUNT WHITNEY (LCC-20), USS              
 DWIGHT D. EISENHOWER (CVN-69), USS ELLIOT (DD-967), USS GUAM (LPH-9), USS      
 AMERICA (CV-66), USS BLAKELY (FF-1072), USS JULIUS A. FURER  (FFG-6), AND      
 USS CLAUDE V. RICKETTS (DDG-5) AND AN ADDITIONAL 15 SHIPS HAVE HAD             
 THEIR CHT PIPING SYSTEM HYDROBLASTED BY SHIPYARD, SIMA, IMA AND SHIP'S         
 FORCE PERSONNEL, ALL UNDER THE TECHNICAL GUIDANCE OF NAVSSES.  IN              
 ADDITION, BY REF A CNO RECENTLY DIRECTED COMNAVSEASYSCOM TO FUND               
 BASIC ALTERATION CLASS DRAWINGS (BACD'S) NECESSARY TO SUPPORT THE              
 PROGRAM AND TO ESTABLISH A PMS PROCEDURE FOR ACCOMPLISHMENT OF                 
 CHT PIPING SYSTEM HYDROBLAST CLEANING.                                         
                                                                                
                                                                                
                                                                                
                                                                                
                                                                                
 THIS ADVISORY IS APPLICABLE TO THE FOLLOWING CLASSES OF SHIPS:                 
 AE-21, AOR-1 CG-26, CGN-36, CGN-38, LPD-1 AND LST-1179.