Jack up rig “BIMA” initial layup visit and proposal

Date : 17th September 2010 @ 1300 hrs


Team : Saravanan Ven (Routine Engineer)

           Capt. Edmund (HSSEQ MGR)

           Muru (Sr. Elec. Engineer)

Current location : LSE berth

Scope : 1. General assessment on hazard

            2. Explanation on cold lay up

            3. Understanding the requirement from vessel operators

            4. Propose system require



Observations

The subjected rig has total 4 decks. The top 3 decks including the main deck are accommodation and the bridge. The helipad located above the bridge. The machineries are located one deck below of the main deck. Noticed most of deck machineries including the both cranes only can operated on 600V system and other are required 480V system. Emergency generator is lead acid battery starter with common diesel daily tank. The supply to the emergency fire pump is from the emergency bus bar. The emergency generator located at 2nd deck starboard accommodation. The drilling control room located at 3rd deck aft required a dehumidification. Also the top drive control room required dehumidification. The power control located below main deck requested to supply with dehumidification.

Proposals

1. Since they requested to dehumidify the power control room, we propose that the whole machineries spaces (power control room, workshop, compressor room, cement room and generator room) can be dehumidified using single 2100 cubic dehumidifier. The DH will be place on the port main deck direct powered from the layup generator; the ducting can be run through the hatch leading to the machineries room.

2. Even the cranes are incapable to used during the layup, the main deck level will be 12-15 meter which easy reachable by the Kwong Hin barge crane. Proposed to use the barge for all loading and offloading. Only above pointed location is suitable for generator; other location are not wide and not at side of the rig.

3. The drilling control room and top drive control room are very small spaces which can be dehumidified using a 300 cubic dehumidifier each. The power can be tap directly from the layup generator.

4. Just 10 meter cable required to cable up the generator to the shore power if the generator place at pointed location.

5. The accommodation is using an individual AHU for each deck. A 2100 cubic dehumidifier located at main deck and run through each level to dehumidify the whole accommodation.

6. The rate of layup generator will decided after calculate the starting current for the emergency fire pump. At time moment a 250kVa will be sufficient.


Conclusion


To dehumidify the whole rig just require only 2 medium sizes dehumidifiers and 2 extremely small dehumidifiers for the drilling and top drive control rooms.

With 250 kVa generator can be expected 4000 liters diesel oil consumption at initial. Then it can be lowered haft during continues preservation.

No underwater blanking required as the rig will be on air gap of 6 meter.

May required more than 4 solar lights.





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Prepared by,

Saravanan Ven

BP Shipcare