SECTION 1 General

101. General

1. The designer of the drilling system is to evaluate the system as a whole, taking account into the interfacing and interdependence of subsystems.

2. The required design plans and data to be submitted to the Society are in accordance with Ch 2, Sec 2, 202.

102. Equipment layout

Equipment layout and work areas associated with the drilling activities are to be arranged with the following objectives.

1. Safety of personnel and operation

2. Separation of nonhazardous areas from those classified as hazardous areas

3. Separation of fuel and ignition source as far as practical

4. Minimizing the likelihood of uncontrollable releases of hydrocarbon to the environment

5. Minimizing the spread of flammable liquids and gases which may result in a hazardous event and facilitating rapid removal of any accumulations

6. Minimizing the probability of ignition

7. Minimizing the consequences of fire and explosions

8. Preventing fire escalation and equipment damage

9. Providing for adequate arrangements for escape and evacuation

10. Minimizing dropped objects hazards to personnel, equipment and structure

11. Protection of critical systems and equipment such the followings from damage during drilling op- eration

(1) Electrical cables and cableways

(2) Well control equipment

(3) Exhaust ducting and air intake ducting

(4) Control and shutdown systems

(5) Safety systems, fire-gas detection, and fire fighting equipment

12. Access for inspection and servicing equipments

13. Safe means of egress from all machinery spaces.

14. The installation of electrical equipment within hazardous areas is to be in compliance with Ch 7 of the Rules. Combustion equipment and combustion engines are not to be located in hazardous areas.

15. Equipment arrangement drawings are to show the location of all equipment, living quarters, all machinery spaces, tanks, derrick, wellheads/moon pool, flare and vents, escape route, evacuation equipment, air intake, opening to close spaces, and any fire and barrier walls.

16. Additional requirements related to general arrangement and equipment layout are also to consider the applicable requirements of the Rules.

103. Overpressurization protection

1. Systems that may have the potential of exposure to pressure greater than for which they are de- signed are to be protected by suitable pressure protection devices.

2. Designers are to decide design pressure taking into account of all condition encountered and select

Guidance Relating to the Rules for the Classification of Mobile Offshore Drilling Units 2015 39

suitable overpressure protection devices.

104. Fire protection and fire extinction

Fire protection, fire extinction and hazardous area are to be in compliance with applicable require- ments of Ch 7 and Ch 10 of the Rules.

105. Acceptance of manufacturer’s standards

Designs based on manufacturer’s standards may also be accepted. In such cases, complete details of the manufacturer's standard and engineering justification are to be submitted to the Society for review.

1. The manufacturer is to demonstrate by way of testing or analysis that the design criteria employed results in a level of safety consistent with that of a recognized standard or code of practice.

2. Where strain gauge testing, fracture analysis, proof testing or similar procedures form a part of the manufacturer's design criteria, the procedure and results are to be submitted to the Society for review.

3. Historical performance data for drilling systems, subsystems, equipment or components is to be sub- mitted to the Society for justification of designs based on manufacturer's standards.