Loadrate.DOC

              MAXIMUM LOADING RATES

              1. By Cargo Pipeline Restriction.

              2. By Gas Venting Line Restriction.

              Q = Pi.D2 x Fl x 3600 x n  (For cargo pipelines)

                    4

              V = Pi.D2 x Fv x 3600 / 1.5  (For gas venting lines)

                   4

Where:               Q = Liquid volume flow rate in Cu.m./hour

                            Fl= Flow rate in metres/second (taken as

maximum 7m/s)

                            D = Pipeline diameter

                            n = Number of manifold connections

                            V = Gas flow rate in Cu.m./hour

                            Fv= Gas flow rate in metres/second (taken as

maximum 36m/s) 

A. Manifold (=500mm) and bottom lines (= 550mm)

   Q = 4948cu.m./hour/line or 31,122bbls/hour/line

       (3 lines = 14845cu.m. or 93,369bbls/hour)

B. Single tank loading (using main suction valve only)

   Centre tank or pair of Wing tanks

                    (2x400mm strums) = 4948cu.m. or 31,122bbls/hour

   Slop tanks,      (1x250mm strum ) = 1237cu.m. or   7780bbls/hour

C. Main Gas Venting line (= 450mm)                = 13,741cu.m. or 86,439bbls/hour

D. Single tank gas venting line

   Centre tanks (= 300mm)            = 6107cu.m. or 38,413bbls/hour

   Wing and slop tanks (= 250mm)     = 4241cu.m. or 26,675bbls/hour

                                     .....Cont'd/PTO.   

              CONCLUSION

A.  Multiple tanks loading: Maximum loading rates

    Max Loading Rate for this vessel (provided pipelines are in        excellent condition is:-   13,741 m3/hr or 86,433 bbls/hr.

    Using all three top & bottom lines & minimum 3 tanks on            different lines are full open.

1.  If 1 manifold connections used =

                   4,949 and  9,896 cu.m./hour respectively                          or 31,122 and 62,244 bbls/hour

    Governed by main cargo pipeline size.

2.  If 3 manifolds connections used     =

          3 x 4949 = 14845 m3/hr or 93,369 bbls/hour

    Governed by main cargo pipeline size.

3.  Maximum loading rate governed by Main Gas Venting Line =

              13,741 m3/hr or  86,433 bbls/hr.

B.  Single tank loading: Maximum loading rates

1.  Centre tank       = 4,948cu.m. or 31,122bbls/hour.  Governed by                          pipeline size.

2.  Wing tank (pair)  = 4,948 cu.m. or 31,122 bbls/hour.  Governed                          by pipeline size.       

Therefore, maximum loading rates above must be considered and not exceeded.  Additionally, experience, safety, manpower availability and ballast time requirements should be taken into consideration and the loading rate reduced as necessary.

Chief Officer.