AIR SEPARATION PLANT NO.8
A. GENERAL
İSDEMİR will issue a tender for a new Air Separation Plant to be constructed, on turnkey basis,
to meet the increasing demand of Oxygen and Nitrogen for its facilities such as Blast Furnaces
(BF) and Basic Oxygen Furnaces (BOF).
The new Air Separation Plant No.8 Project shall include, but not be limited to the followings:

One Air Separation Plant including Oxygen, Nitrogen and Argon separation, purification
and liquefaction by Internal Compression Cycle.

Liquid pumps to pressurize Oxygen, Nitrogen and Argon. BIDDERS may offer gaseous
product nitrogen compressors or nitrogen recycling compressor.

Equipment for storage of liquid and gaseous oxygen, nitrogen and argon.

Interconnecting piping with its isolating valves and other auxiliary equipment required
for integrating new plant with existing air separation plants and liquid/gas storage
facilities.

Input and output metering systems.
Location for the Plant is next to the Air Separation Plant No.7, near the Air Separation Plants
Complex, in İsdemir, İskenderun, Hatay, TURKEY.
B.
TECHNICAL SPECIFICATION
Contractor shall design and install such a plant that can be operable in the modes shown at the
table below:
MODES OF OPERATION (NM3/H)
PRODUCTS
GAS & LIQUID MODE
PRESSURE
(BARG)
PURITY
(%)
MODE I
MODE II
GAS. O2
27000
27000
8
99,6
GAS. N2
25000
25000
20
99,9990
LIQ. O2
500
500
Into the new storage
tanks provided by the
CONTRACTOR
99,6
LIQ. N2
0
500
Into the existing tank
99,9990
LIQ. Ar
800
800
Into the new storage
tanks provided by the
CONTRACTOR
99,9992
Product Purities:
Product Oxygen  99,6 %
Product Nitrogen  99,9990 % (10 vppm total impurities with Oxygen not exceeding 4 vppm)
Product Argon
 99,9992 % (8 vppm total impurities with Oxygen not exceeding 1 vppm and
Nitrogen not exceeding 5 vppm)
Design Features:
The following general features shall be applied:

Precooling of process air shall preferably be done by use of a direct contact air cooler in
combination with evaporation cooler. The use of a refrigeration unit shall be avoided if
possible.

Purification of the process air shall be performed with molecular sieve adsorbers equipped
with a molecular sieve and activated alumina filling.

Rectification columns other than HP shall be equipped with structured packings.

The Argon separation shall be performed entirely by cryogenic rectification in order to
avoid hydrogen-consuming systems.

Pressurization of the gaseous Oxygen shall be performed by liquid pumping and
evaporation of the pressurized liquid shall be conducted in the main heat exchanger.
Pressurization of the Nitrogen might be performed by liquid pumps or recycling
compressor or product compressors.

Pressurization of the gaseous Argon shall be performed by liquid pumping and evaporation
of the pressurized liquid Argon shall be conducted in the atmospheric type vaporizer.

Pure argon column shall be equipped with a separate defrosting system which is capable to
defrost only pure argon column during normal operation (without interrupting O2 and N2
production) in case of argon production fails.

The Bidder shall strive to design the whole system as efficient as possible, reducing the
electricity and steam consumptions.
Operation Features:
The plant and its control system shall be designed for attended operation, whereby one operator
per shift must be sufficient for supervision and operation.
The following features and functions shall be provided:

The plant must be designed for fully automatic steady state operation, i.e.
o Automatic control of rectification.
o Automatic control of product purity.
o Automatic control of molecular sieve adsorber station.
o Automatic control of machinery.
o Automatic product shut down at “off-spec.” purity.
o Automatic fail-safe plant shut down in case of abnormal conditions.
o Automatic fail-safe machinery shut down in case of abnormal conditions.

Load or product changes shall be performed by manual adjustment of set points for process
parameters from the operation board of the control system.

Plant start up shall be performed automatically from the operation board of the control
system. (AST: Automatic Start-up up to argon production or including the start-up of crude
argon-deox. column in Cold Conditions)

Scheduled plant shut down shall be performed manually from the operation board of the
control system.

The plant must be designed to allow smooth changes from different operation points to any
pre-defined intermediate product mix and total capacities, automatically. (ALC: Automatic
Load Change).

The range shall be in accordance with the specified operation modes. The minimum
requirement for the turndown capability of the plant is 76 % of the maximum production
capacity.

The plant shall be capable of being operated continuously for a period of 3 years until a
scheduled shutdown and deriming is required.
C. SCOPE OF WORK
The following table shows a summary of the scope of supply and work (main parts).
Units / Works
To be supplied
By Contractor
By İsdemir
1. Scope of Supply
Basic Air Separation Plant Equipment
 Air / Booster / Recycle Compressor(s)

 Air precooling and purification systems

 Cold Box (rectification system)

 Product Compressor(s)

Peripheral Air Separation Plant Equipment
 Liquid and/or gaseous storage/back-up system

 Cooling water system

 Maintenance cranes

 Instrument air and purge/seal system

Electrical
 Complete electricity from HV, MV, LV feeders

 MV switchgears, LV equipment

 Cables and cabling accessories

 Lightening and protection system

Instrumentation
 Field instrumentation

 Plant control system

 Analyzers

Others
 Spare parts

 Shipment

 Loading / unloading

 All insurances, License Fees

 Drawings & documents

2. Scope of Works
Piling, if necessary

Civil works

Erection

Supervision of erection and commissioning

Training of personnel
