D-SR-011, Rev. 1, December 1994 page 1

NORSOK STANDARD

SYSTEM REQUIREMENTS

BULK SYSTEM NO. 11-10

D-SR-011

Rev. 1, December 1994

Please note that whilst every effort has been made to ensure the accuracy of the NORSOK standards neither OLF nor TBL or any of their members

will assume liability for any use thereof.

1 FOREWORD

This standard has been developed by the NORSOK standardisation work group and agreed by the Norwegian industry for the widest possible national and international application.

2 SCOPE

3 NORMATIVE REFERENCES

Recognised pressure vessel code/standard.

4 DEFINITIONS AND ABBREVIATIONS

4.1 Definitions

4.2 Abbreviations

5 FUNCTIONAL REQUIREMENTS

5.1 General

The Bulk System shall receive, store and deliver required volume of bulk material to the mud and cementing system.

5.2 Products/Services

D-SR-011, Rev. 1, December 1994 page 2

5.3 Equipment/Schematic

The system should comprise of the following main items:

Bulk mud storage tanks. Bulk cement storage tanks. Bulk tank ventilation/regeneration system. Bulk transfer and dosing system. Loading stations. Field instruments. Surge tanks.

5.4 Performance

Class I Class II Bulk transfer from boat cement, barite, bentonite 100 mt/h

50 mt/h 100 mt/h 50 mt/h

Bulk transfer to surge tank cement and barite bentonite 60 mt/h 30 mt/h

60 mt/h 30 mt/h

Bulk storage tank capacity cement barite/bentonite 120 m3 180 m3

180 m3 240 m3

5.5 Regularity

5.6 Process/Ambient Conditions

North Sea environmental conditions shall apply. Barite weight (bulk material),2.16 s.g. Bentonite weight (bulk material),0.96 s.g. Cement (bulk material),1.5 s.g. Dew point bulk air,-40 C.

D-SR-011, Rev. 1, December 1994 page 3

5.7 Operational Requirements

The bulk material shall be kept dry and fluffed during storage.

Precaution shall be included to prevent plugging of the transfer lines during operation. The bulk system shall be flexible to add or delete extra storage tanks to adjust the storage

capacity to accommodate the drilling program and supply frequency. Bulk storage tanks may be equipped with safety valves or rupture discs. Rupture discs can

only be used for bulk storage tanks installed in open areas. For bulk storage tanks in enclosed areas, testable safety valves that are vented out of the enclosed area shall be used. Such enclosed areas shall similarly be ventilated to avoid pressure build-up in the event of a fracture or leakage in the piping for the air supply system.

Possibility for transfer of dry bulk between storage tanks shall be accommodated. No bulk material shall evacuate with the transport air during normal operation. The cement and barite/bentonite system shall be separated. No valves, nozzles, etc. to be located inside bulk tanks in order to avoid entering of the

tanks.

5.8 Maintenance Requirements

5.9 Isolation and Sectioning

5.10 Layout Requirements

5.11 Interface Requirements

5.12 Commissioning Requirements

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