18.4.1 The master shall ascertain that the quantity
                           and characteristics of each product to be loaded are within the limits
                           indicated in the International Certificate of Fitness for the Carriage
                           of Liquefied Gases in Bulk required by 1.4, and in the Loading and
                           Stability Information booklet required by 2.2.5, and that products
                           are listed in the International Certificate of Fitness for the Carriage
                           of Liquefied Gases in Bulk as required under section 4 of the certificate.
                        
                        
                        
                      
                     
                     
                     
                        
                        
                         
                           18.4.2 Care shall be taken to avoid dangerous
                           chemical reactions if cargoes are mixed. This is of particular significance
                           in respect of:
                        
                        
                        
                        
                           - 
                              
                              
                              
                                 .1 tank cleaning procedures required between successive
                                 cargoes in the same tank; and
                              
                              
                              
                            
                           - 
                              
                              
                              
                                 .2 simultaneous carriage of cargoes that react
                                 when mixed. This shall be permitted only if the complete cargo systems
                                 including, but not limited to, cargo pipework, tanks, vent systems
                                 and refrigeration systems are separated as defined in 1.2.47.
                              
                              
                              
                            
                        
                        
                        
                      
                     
                     
                     
                        
                        
                         
                           18.4.3 Where products are required to be inhibited,
                           the certificate required by 17.8 shall be supplied before departure,
                           otherwise the cargo shall not be transported.