Ira Sigit Pradikta, 2017, NIT: 49124450.N, "Efforts to Reduce Pressure On
Cargo Tank In Ship LPG / C Gas Walio", Thesis Program Nautical
Studies, Diploma Program IV, Polytechnic Studies Sailing Semarang,
mentors I: Capt. Moh. Aziz Rohman, M.M, Supervisor II: Ir. Fitri
Kensiwi
Transporting of LPG in fully refrigerated vessel require spesific handling in
relation to temperature and pressure of cargo tank so that cargo tank is well
prepared to be loaded. So it is need to know how to handle temperature and
pressure of cargo tank in loading and its obstacles which is influence it and effort
to overcome it. As for the basic theory states that LPG in atmospheric pressure
will evaporate in very low temperature, they are -42.30C for propane -0.50C for
butane. Therefore temperature and pressure in cargo tank must be in stable to
maintain LPG in liquid.
In this paper, writer use qualitatif methode, and collecting data by observing
object directly, interviewing a number of respondents and supported by
documentation method. According to the result of research, in handling
temperature dan pressure of cargo tank are carried on by running reliquefaction
system in preparing cargo tank, make cargo tank well prepared to be loaded, keep
attention of temperature and pressure changes in cargo tank in loading. Whereas
the obstacles such as warm cargo from mother ship and reliquefaction system run
with less than optimal caused by disturbance of cargo condenser dan sea water
pump. So the efforts to overcome it by communicating with mother ship officer
soon and connecting vapour return line in loading.
By carrying out the procedure of cooling the tank prior to loading the cargo
tank pressure is expected to be ready to be loaded, so that loading activities can
run smoothly and the company did not experience losses due to disruption of ship
operations such as delays would unloading process for loading process is too long.
Key word: LPG fully refrigerated, temperature and pressure of cargo tanks,
loading
