Iranian Classification Society Rules

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Section 1 General


101. Application


1. The requirements in this Chapter apply to production and process system installed in the unit with Production notation specified in Ch 2. For the production and process system installed in the unit without Production notation, safety related requirements of this Chapter including facility layout, safety system, process shutdown systems apply.


2. The requirements in this Chapter apply to equipment and systems for handling and processing pro- duced fluids from completed wells. However, systems supporting process system other than being directly engaged in processing produced fluids apply to Sec 4.


3. The requirements in this Chapter apply to facilities which are only installed on the unit and the boundary between production systems and other onboard systems are as the following:

(1) from the first inlet flange of the well fluid flow line above the water level inboard for import systems

(2) to the flange connected with the inlet flange of the storage tank.

4. The requirements in this Chapter do not apply to production equipment which is installed in subsea such as a well head, a christmas tree and etc.


5. The requirements not specified in this Guidance are to be in accordance with relevant requirements in Ch 8, Ch 9, Ch 10.


6. They are also to be complied with National Regulations of the coastal state in which the unit is located during operation. Where statutory requirements of the National Authority are stricter than re- quirements of this Chapter, they are to be in accordance with statutory requirements of the National Authority.


7. The overboard discharge from the production treatment plan onboard is not subject to MARPOL Annex I but subject to the national and/or regional regulations.


102. General


1. Hydrocarbon processing systems and associated equipment are to be designed to minimize the risk of hazards to personnel and property caused by potential threats to safety, with considering the fol- lowings:

(1) Prevent an abnormal condition from causing an upset condition

(2) Prevent an upset condition from causing a release of hydrocarbons

(3) Safely collect and dispose of hydrocarbon gasses and vapors released

(4) Prevent formation of explosive mixtures

(5) Prevent ignition of flammable liquids or gases and vapors released

(6) Limit exposure of personnel to fire hazards

2. Structure that supports production facilities or forms an integral part of the equipment is to be de- signed to a recognized standard. Plans and calculations are to be submitted for the Society review. Process liquid weights and dynamic loads due to installation motions and other loads, such as wind imposed loads, are to be considered.


103. Codes and standards


1. The requirements not specified in this Chapter are to be international standards.


2. The following standards may be adequately referred standards.


in accordance with recognized national or as recognized national or international

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Standard No.

Standard Title


API RP 14C

Recommended Practice for Analysis, Design, Installation and Testing of Basic Surface Safety Systems on Offshore Production Platforms


API RP 14E

Recommended Practice for Design and Installation of Offshore Production Platform Piping Systems

API RP 14J

Recommended Practice for Design and Hazards Analysis for Offshore Production Facilities

API Std 610

Centrifugal Pumps for Petroleum, Petrochemical and Natural Gas Industries

API Std 660

Shell-and-tube Heat Exchangers

API Std 661

Air-Cooled Heat Exchangers for General Refinery Service

API Spec 12K

Specification for Indirect Type Oilfield Heaters

API Spec 12L

Specification for Vertical and Horizontal Emulsion Treaters

API Spec 16C

Choke and Kill Systems

ASME B31.3

Process Piping

NACE MR 0175

/ISO 15156

Petroleum And Natural Gas Industries - Materials for use in H2S containing environment in oil and gas production


104. Definition


1. Christmas tree Assembly fitted with valve, pressure gauge and etc. which is install above the completed well and controls flow of crude oil or gas.

2. Completed well Wells fitted with Christmas trees attached to the wellhead, such that the flow of fluids into and out of the reservoir may be controlled for production purposes.

3. Fired vessel A vessel in which the temperature of the fluid is increased by the addition of heat supplied by a flame within the vessel. Specifically for hydrocarbon services, there are two types of fired vessels:

(1) Direct fired vessel: A vessel in which the temperature of process hydrocarbon fluids is increased

by the addition of heat supplied by container.

(2) Indirect fired vessel: A vessel in which

of combustion (such as exhaust gases through a heating medium, such as hot

a flame. The flame is applied directly to the fluid


the energy is transferred from an open flame or product from turbines, engines, or boilers) to the hydrocarbon, oil.

4. Produced fluids Fluids coming out of completed wells, which may consist of oil, water, gas, and condensable vapor.


5. Upset condition A condition that occurs in a process component or system when an operating variable deviates substantially from its normal operating limits. If left unchecked, this condition can result in a threat to safety and may cause shutting-in of the process.


6. Wellhead area An area from well to process equipment including christmas tree.


7. Process system A system that separates production fluid into crude oil, water and gas, and pu- rifies them. Such system generally consists of produced fluid separator, heat exchanger, fired vessel, gas compressor, pump, relevant piping system and relevant.


8. Process support system A system that complements the production systems. Such system gen- erally consists of cooling water systems, heating systems, fuel oil system, hydraulic/air control sys- tem and purging system for production equipment.


9. Emergency shutdown system, ESD system System of manual stations that, when activated, will initiate the unit shutdown.


10. Process station One or more process components performing a specific process function, such as separating, heating, pumping etc.


11. Shutdown valve An automatically operated valve used for isolating a process station


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12. Process shutdown, PSD The isolation of a given process station from the process by closing appropriate shutdown valves to shut in flow to the process station or divert flow to another process station.

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