Iranian Classification Society Rules
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IRANIAN CLASSIFICATION SOCITY
2011
Guidance for Ships Carrying CNG in Bulk
GC-05-E
IRANIAN CLASSIFICATION SOCITY
APPLICATION OF "GUIDANCE FOR SHIPS CARRYING CNG IN BULK"
1. Unless expressly specified otherwise, the requirements in the Guidance apply to ships carrying compressed natural gas in bulk for which contracts for construction are signed on or after 1 July 2011.
CONTENTS
CHAPTER | 1 | GENERAL 1 |
Section | 1 | General 1 |
CHAPTER | 2 | CLASSIFICATION SURVEYS 3 |
Section | 1 | General 3 |
Section | 2 | Periodical Surveys 3 |
CHAPTER | 3 | STRUCTURES AND EQUIPMENTS 5 |
Section | 1 | General 5 |
Section | 2 | Ship Survival Capability and Location of Cargo Tanks 10 |
Section | 3 | Ship Arrangements 15 |
Section | 4 | Cargo Containment 21 |
Section | 5 | Process Pressure Vessels and Liquid, Vapour, and Pressure Piping Systems 36 |
Section | 6 | Materials of Construction 41 |
Section | 7 | Cargo Pressure/Temperature Control 48 |
Section | 8 | Cargo Tank and Cargo Hold Vent Systems 49 |
Section | 9 | Environmental Control 51 |
Section | 10 | Electrical Installations 53 |
Section | 11 | Fire Protection and Fire Extinction 54 |
Section | 12 | Mechanical Ventilation in the Cargo Area 58 |
Section | 13 | Instrumentation (Gauging, Gas Detection) 60 |
Section | 14 | Filling Limits for Cargo Tanks 62 |
Section | 15 | Use of Cargo as Fuel 63 |
Section | 16 | Operating Requirements 65 |
CHAPTER 1 GENERAL
Section 1 General
101. Application
1. This Guidance is to apply to ships(hereinafter referred to as "ships carrying CNG in bulk") re- gardless of their size, including those of less than 500 tons gross tonnage, engaged in carriage of compressed natural gas in bulk.
2. This Guidance is to apply to cargo containments, cargo handling systems and related system. And the requirements not specified in this Guidance such as hull, machinery and equipment, etc. are to be in accordance with the Rules for the Classification of Steel Ships(hereinafter referred to as "the Rules").
3. The Structures and equipments of the ships carrying CNG in bulk is to be accepted by the flag state and the respective port authorities.
102. Equivalence
Special equipment, which is not appropriate to apply the requirements of this Guidance or not specified in this Guidance, may be accepted by the Society provided that the Society is satisfied that such equipment is equivalent to or above those complying with the requirements of this Guidance.
103. Classification
The Classification is to be in accordance with the requirements specified in Pt 1 of the Rules.
104. Class notations
The class notations assigned to the ships carrying CNG in bulk classed with the Society are to be in accordance with the requirements specified in Pt 1, Ch 1, 201. of the Rules. However, the notation "Compressed Natural Gas Carrier" is to be assigned as a ship type notation. 
CHAPTER 2 CLASSIFICATION SURVEYS