32 Samss 008
32 Samss 008
32 Samss 008
1 Scope............................................................. 2
2 Conflicts and Deviations................................. 2
3 References..................................................... 3
4 Design............................................................ 4
5 Pulse Air System Requirements..................... 9
6 System Performance Requirements............ 10
7 Electrical and Instrumentation...................... 11
8 Protective Coatings...................................... 16
9 Design Drawings.......................................... 16
10 Inspection..................................................... 16
11 Testing Requirements.................................. 16
12 Guarantee.................................................... 16
13 Export Packing, Marking and Shipping........ 17
1 Scope
1.1 This Specification together with the Purchase Order covers the minimum
mandatory design, performance and testing requirements for combustion gas
turbines inlet air filtration systems. These environments could be subject to any
combination of dry, high ambient dust, salt concentrations, fog and high
humidity conditions.
1.2 The intent of the inlet air filtration system is to limit the ingestion of airborne
contaminants such as sand, dust and alkali metal salts so as to prevent gas
turbine compressor erosion, fouling, cooling air passage blocking and hot
corrosion of the turbine section components. The system specified herein is
intended for continuous duty, high efficiency air filtration.
1.3 Air filtration systems covered by this Specification are limited to the automatic
pulse-jet self-cleaning type. The system may be a single stage comprising the
pulse-clean element alone, or a two-stage system comprising the pulse-clean
element with a second stage high performance barrier filter. Barrier style filters
alone may be considered for offshore applications, if supporting information
related to similar experience is submitted through the Company or Buyer
Representative for review and approval by the Chairman, Gas Turbines & Diesel
Engines Standards Committee, Consulting Services Department.
1.4 Air filtration systems shall be supplied by qualified experienced Vendors who
must have:
a) Previously manufactured at least two systems of similar type and design.
b) Shown a satisfactorily system performance of at least three years of
continuous fielded service.
c) Proven through testing that the proposed system meets the Type Test
requirements outlined in paragraph 11 of this Specification.
1.5 Compliance with the provisions of this Specification does not relieve the Vendor
from the responsibilities of furnishing equipment properly designed to meet the
specified operating service conditions.
1.6 Alternative designs may be proposed. Products of comparable type and quality
may be submitted for the Buyer's written acceptance with the Quotation.
All requests to deviate from this Specification and any conflicts between this
Specification and other applicable Saudi Aramco Materials System Specifications
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3 References
The selection of material and equipment and the design, construction, and repair of
equipment and facilities covered by this Standard shall comply with the latest edition of
the references listed below, unless otherwise noted.
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SAE International
SAE J 726, 1993 edition Air Cleaner Test Code, Recommended Practice
4 Design
4.1 General
4.1.1 The inlet air filtration system shall be suitable for operation with the
combustion gas turbine as specified in the Purchase Order description,
and the environmental conditions specified based on the site's specific
meteorological and seismic data as specified in the data sheets.
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4.1.3 The following ground sample analysis can be considered typical for an
inland site:
Silica 50
Calcium 32
Magnesium 9
Alumina 5
Potassium 3
Sodium 1
The hot desert regions of the Arabian Peninsula are subject to extreme
fluctuations in wind force both daily and seasonally. The particle size
distribution of airborne particulate varies greatly with wind velocity.
Analysis of airborne particulate gives the following distribution:
4.1.4 The aerodynamic design shall be such that air intake velocities are
uniform across the entire filter area.
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4.1.6 Where two-stage systems are proposed, the first stage shall be
self-cleaning and shall be capable of meeting the performance
requirements alone, and the second stage barrier filters shall be
considered as a back-up to the primary self-cleaning stage.
4.2.1 The filter house shall be of a bolted and welded design fabricated from
hot rolled sheet steel.
The Clean and Dirty Air plenums sheet steel shall be at least 3.0 mm
(⅛ inch) thick (ASTM A36M/ASTM A283M or equivalent) and shall
be reinforced with steel members. Reinforcements shall also be
provided, as needed, to reduce the movement of filter cartridges during
pulsing and to completely eliminate any potential vibration issues
4.2.2 All structural strength welding shall be continuous, and continuous seal-
welding shall be used in places that are not self-draining or where
crevice corrosion is likely to occur. The edges of tightly contacting
surfaces shall be completely seal welded. All welding shall be as per
AWS D1.1 procedures or JIS/EN equivalents.
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4.2.5 Inlet air filtration horizontally mounted filter elements type system are
not acceptable.
4.2.6 All filter elements shall be changeable from the upstream side.
Filter change-out shall be achievable without shutting down the gas
turbine. Filter elements shall be designed for easy installation and quick
change out, avoiding blind assembly, ungasketed washers and other
undesirable assembly features. Where blind assembly cannot be
avoided, lead-in devices shall be provided on the element or filter house
to facilitate assembly. The precise method of filter element assembly
and sealing shall be submitted for information through the Company or
Buyer Representative to the Chairman, Gas Turbines & Diesel Engines
Standards Committee, Consulting Services Department.
4.2.7 The design shall be such that inlet air is drawn from a point not less than
3 m (10 ft) above grade level to avoid ingestion of heavy ground level
dust and sand during windy conditions and ground heated air during
high ambient temperature conditions. The exact elevation shall be as
specified in the Purchase Order.
4.2.8 Stainless steel trash screen with 25 mm (1 inch) maximum square mesh
of minimum 5 mm diameter (6 gauge) wire or rod shall be provided.
The trash screen shall be supported at the downstream face of the inlet
silencers. Tack welding of the trash screen is acceptable. All bolts and
fasteners shall be also tack welded.
4.2.10 Safe personnel access shall be made for inspection downstream of the
filters. Access shall be using bolted gasketed door requiring manual
disassembly.
4.2.13 For multi-level installations, access shall be provided to the clean and
dirty air sub-plenums for access to all filter banks, pulse air piping,
solenoids and valves. Stairways to each level shall be provided.
Access ladders alone are not acceptable.
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4.3.1 All support structure materials, except ASTM A193, ASTM A194,
ASTM A490 or ASTM A490M bolts, and crane rails, shall be
galvanized, unless painting is specified in the Contract Documents.
Steel embedded in concrete (including ASTM A36, ASTM A307 and
ASTM F1554 anchor bolts) shall be hot-dip galvanized. Zinc plating is
not acceptable.
4.4.1 Sealing gaskets shall be attached to the filter elements such that new
gaskets are provided at each filter change. A metal stop or similar
device shall be incorporated to ensure correct gasket compression.
Where applicable, filter media shall be glued to the face guard or the
wrapping cord at sufficient locations to maintain adequate pleat spacing.
4.4.3 The filter element and the end caps shall be sufficiently strong to allow
a 30 cm (1 ft) drop to the metal walk floor without disabling damage to
the filter element.
4.4.4 In coastal and foggy areas, the filter element shall be made of water
repellent materials.
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4.5.1 Grating shall be in accordance with PIP STF05530. Stairs, guard rails,
handrails, stair rails, and toe boards shall be per figures in PIP STF05520.
1) AB-036106 Type A, Stairs for Platforms
2) AC-036198 Type B, Stairs for Platforms
4.5.3 The above mentioned PIPs may give solutions to certain types, if such a
case is encountered, the type and its solution shall be followed.
5.1.1 The air pulse system shall be designed to effectively operate with a
normal pulse air gauge pressure of 560 to 700 kPa gauge (80 to 100 psig).
5.1.3 The pulsing system shall be able to operate on a continuous basis (with
and without a differential pressure trigger) and timed basis (with the
unit operating or on standby).
5.1.4 The overall self-cleaning design shall be such as to minimize flow and
pressure perturbations due to pulse cleaning. In no case shall more than
15% of the filter elements in any module be pulse cleaned
simultaneously and in no case shall more than 5% of the total filter
elements be pulse cleaned simultaneously.
5.1.5 Flexible hoses shall be stainless steel armored, with integral connectors.
The hose length shall not exceed 600 mm. The hose lining shall be
suitable for the process and operating conditions.
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5.1.6 For the pulse air system, all components shall be 316 or 316L stainless
steel. All welded components shall be 316L.
5.2 Instrumentation
5.2.1 Each separately controlled filter stage shall have a pressure transmitter
and an active back-up pressure transmitter with separate pressure
sensing lines, either of which acting alone shall be capable of activating
the pulse-clean mechanism. Failure of either pressure transmitter shall
automatically activate the pulse-clean mechanism.
5.2.3 Solenoid valves and air diaphragm valves shall have coated bodies to
become corrosion and UV resistant.
5.2.6 High set points, low set points, pulse frequency, pulse duration and,
where applicable, number of full cleaning cycles shall be field
adjustable. All adjustable parameters shall be factory set by the Vendor.
The Vendor shall supply details of the range of field adjustment
available on these parameters.
6.1 The filter system shall be sized to handle both the gas turbine inlet air and any
GT enclosure ventilation requirements. The filter system design shall be based
on 105% of the total turbine system volumetric air flow requirement (including
cooling, ventilation and pressurizing air) at 15°C and 100 kPa (14.5 psia)
ambient site conditions.
6.2 The air to media velocity shall not exceed 1.5 cm/s (3.0 feet per minute) through
the pulse-clean filter element (Media) in the case of vertically hanging
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cylindrical cartridges. The updraft velocity into the filter bank shall not exceed
1.52 m/s (300 feet per minute) and the vertical velocity between filter elements
shall not exceed 2.54 m/s (500 feet per minute).
6.3 The filter system shall meet the filtration testing requirements of Appendix II.
6.4 The system shall be capable of operating continuously during simulated dust
storm conditions with an inlet dust concentration of 0.57 g/m³, when tested in
accordance with the requirements in Paragraph 11 of this Specification.
6.5 The initial pressure drop in clean filter condition shall not exceed 0.2 kPa
(0.75 inches water gauge) across the filter elements and 0.4 kPa (1.5 inches
water gauge) across a single stage of the filter system.
The pressure drop across all filtration and screening stages of the complete
system shall not exceed 0.625 kPa (2.5 inches water gauge).
The pulse-clean cycle shall be initiated at not more than 0.625 kPa (2.5 inches
water gauge) pressure differential across the self-cleaning filter elements.
6.6 The filtration system shall be capable of self-cleaning back to the acceptable
operating pressure drop from a pressure drop of not less than 2.5 kPa (10 inches
water gauge) across the pulse clean stage.
7.1 Both The instrumentation system and the electrical equipment shall comply with
the electrical area classification requirements designated in the Purchase Order
or on the approved electrical area classification drawing.
7.2 Wiring
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7.2.5 Splices are not permitted in wiring. When wiring must be extended,
connections shall be made via terminal blocks.
7.2.7 Fused terminals shall be used for power distribution, alarm, and
shutdown systems.
7.2.8 Double Block and bleed arrangement for each one of the instruments,
grouped in the 2 out of 3 shutdown logic, shall be provided to enable
maintenance while the unit is in operation
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7.2.9 Different instruments signals shall be segregated from each other and
from power wiring.
7.2.10.2 Armored cables may be routed on trays. For this option, the
following guidelines shall be followed:
a) The armored cable shall be suitable for the area
classification where the packaged unit is installed
(e.g., ITC, PLTC, MC, etc.).
b) The armored cables shall be routed on aluminum or
stainless channel trays. Galvanized steel trays are not
acceptable.
c) The cable armor shall be either steel wire armor or
interlocked metallic armor.
d) The trays shall be elevated and shall not be mounted to
the skid base plate unless protected by grating.
e) Tray ends are bent to avoid having sharp edges.
f) The glands at both ends of the armored cable shall be
certified flameproof (EExd) gland. Where sealing is
required by NFPA 70, the gland shall be certified (EExd)
with a compound barrier seal (e.g., CMP Protex 2000 -
PX2K).
7.2.11 JB shall be 316 series SS and be IEC 60529 type IP66 or NEMA
250/NEMA ICS type 4X and shall meet the segregation requirements of
paragraph 7.2.9.
7.2.13 All packaged unit wiring, intended for interface with plant wiring and/or
control package, shall be terminated in junction boxes.
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shall identify the device to which the opposite end of the wire is
connected. Heat shrink or ferrule type wire tags with permanently
embossed identification markings shall be used.
7.2.15 The alarm and shutdown contacts shall be wired fail safe, (i.e., the
alarm and shutdown contacts shall be closed during normal operation
and shall open when the alarm or shutdown condition is reached).
If relays are being used then fail-safe is: “Deenergize to alarm and
deenergize to shutdown shall be standard” (i.e., the alarm and shutdown
relays shall be normally energized). For shutdown systems, the
initiating devices shall be independent, dedicated primary elements
having their own individual process connections.
7.3.1 The instrument piping and tubing installation shall ensure the reliable
and accurate operation of the instrument(s) involved, and allow
sufficient access for maintenance, calibration and testing. It shall be
possible to test all alarm and shutdown initiating devices, without
interfering with the process operation of the packaged unit.
7.4 Where applicable, instrument connections shall be NPT female threaded and
conform to ASME B1.20.1. Pneumatic signal and supply connection sizes shall
be ¼ inch or larger, NPT female. Electric signal connection sizes shall be at
least ½ inch NPT female for transmitters, indicators, and solenoid valves.
7.5 Instrument Piping and Tubing threaded fittings shall be forged carbon steel or
stainless steel per ASME B16.11, and be Class 3000 for systems rated up to and
including ANSI Class 900, and Class 6000 for systems rated ANSI Class 1500.
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7.6 A watertight (NEMA 4X) permanent lighting system of adequate capacity shall
be provided for inspection and maintenance. The system shall be suitable for
120 volt, single phase, 60 Hz in accordance with outdoors non-classified area
standards. Wiring shall be in rigid conduit, conduit fittings and terminal boxes.
Threaded lighting fixtures shall have NPT female threads. A permanent lighting
system inside the clean air plenum is not required.
7.8 Solid state electronic timer/sequencer devices shall be housed per paragraph 7.7
and be installed at a convenient location to avoid radiant and convected heat.
7.10 The high differential pressure indicating transmitter shall be wired to give a high
pressure alarms on the turbine panel and in the central control room for each
stage. The lower set point shall provide an alarm annunciation and the high set
point shall be wired to shutdown the turbine. The alarm and shutdown set points
shall not exceed the following:
a) Single Stage System
7.11 All pneumatic instrumentation shall pass leakage test of all piping and tubing.
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8 Protective Coatings
8.1 The exterior and interior of the filtration unit shall be coated in accordance with
Appendix I.
8.2 The selected coating shall not contain vanadium, lead, mercury, zinc or any
other heavy metals.
8.3 Non-ferrous metal and stainless steel surfaces do not require painting.
8.4 Welds, corners and edges shall be brush painted prior to application of the first
spray coat to ensure adequate coverage in these areas.
9 Design Drawings
The Vendor shall submit detailed structural, electrical, and instrumentation drawings that
are proposed to be furnished, in accordance with this specification, through the Company
or Buyer Representative for information to the Chairman, Gas Turbines & Diesel Engines
Standards Committee, Consulting Services Department, prior to fabrication.
10 Inspection
The filter system components are subject to inspection in accordance with the
referenced Form 175-325503, 175-325508, and 175-325515.
11 Testing Requirements
12 Guarantee
12.1 The Vendor shall guarantee a minimum pulse-clean element life and
performance (per Section 6 of this specification) of two years of continuous
operation in the environment as specified in the datasheet. The total filter
element life, including storage and operation, shall not be less than five years
from date of manufacture.
12.2 The Vendor shall not, without obtaining the Buyer's written permission, alter the
design, method of manufacture or change materials in any way from the original
design as submitted and qualified by the testing specified, during the course of
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Export packing, marking and shipping shall be in accordance with the Purchase Order.
Revision Summary
15 June 2013 Major revision.
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2. Epoxy Primer with two Epoxy top coatings shall be applied in three coats at
275-400 microns after cleaning the surface at cleanliness SSPC-SP-10 (NACE-2) with
anchor profile at 40-65 microns.
3. One coat primer 50-100 micrometers, minimum-maximum. Two or more top coats
150 micrometers, maximum per coat.
4. Epoxy Primer with two Epoxy Top coatings shall be from the following approved
coating materials:
APCS-1B
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6.1 Epoxy coatings supplied in accordance with this Specification shall meet the
requirements of SSPC-Paint 22.
The ready mixed paint shall be easily applied to a vertical surface at the
following dry film thicknesses with no tendency to orange peel, sag,
creep or run:
Epoxy primers: 100 micrometers(4 mils)
(APCS-1B):
Epoxy topcoats: 150 micrometers (6 mils)
At 40°C, the viscosity of the ready-mixed paint shall remain within the
range recommended by the manufacturer for sprayability without
additional thinning for not less than 1 hour.
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6.3.1 Test panels shall be ASTM A36 hot-rolled steel approximately 100 mm
X 150 mm. Prior to preparing the surface, the condition of the test panel
shall be equivalent to SSPC-Guide to Vis 1 Rust Grade A, Adherent Mill
Scale. The minimum thickness of the test panel shall be 5 mm.
6.3.2 The test panel shall be abrasive blast cleaned to near white metal (SP-10
or Sa 2-½).
6.3.4 Coatings shall be mixed, applied and cured in accordance with the
Vendor's recommendations. The temperature of the test panel shall be
63 ± 2ºC during coatings application. Dry film thickness shall be
measured and recorded in accordance with SSPC-PA2 and shall meet the
requirements in Table 1.
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Table 2
Table 3
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Prepare two panels and apply the complete coating system. Scribe the
fully cured coating system in accordance with ASTM D1654 and expose
in a salt fog cabinet in accordance with ASTM B117, Salt Spray (Fog)
Testing. This procedure shall be continued until the test panels are
exposed for 500 hours in the salt fog cabinet. At the conclusion of the
test, the coating shall be evaluated for and shall meet the criteria shown
in Table 4.
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1. Scope
This testing procedure is for filtration system type testing that filter element
manufacturer must meet to become an approved Vendor. This test procedure defines
the test equipment, materials, conditions and procedure required to determine the initial
pressure drop, collection efficiency, cleanability, and integrity of a pulse-jet self-
cleaning air filtration system.
1.1.1 The test equipment shall consist of a complete air filtration system
including pulse-clean mechanism (as proposed by the Vendor to meet
this Specification), airflow system, air sampling system and dust feeding
system.
1.1.2 The test filter system shall consist of a full size module, of at least
1.4 m³/s (3,000 CFM) capacity, identical in component size, materials
and fabrication to the proposed design. The air valve flow coefficient
{C(v)} divided by the sum of the areas of the orifices in the blow pipe
shall not be greater than in the proposed design.
1.1.3 The airflow system shall consist of an exhauster with suitable controls
and airflow measuring equipment to insure constant airflow throughout
the tests.
1.1.4 Airflow sampling shall be conducted using isokinetic probes and Gelman
Closed Face Holders fitted with 0.45 micrometer type membrane filters
or equal. The isokinetic probes shall be minimum length and the
quantity of air sampled shall be measured by approved methods and
corrected to standard conditions.
1.1.5 The dust feeding system shall consist of a dust feeder and one or more
compressed air operated dust injectors. The dust feeder shall feed the dust
at a uniform continuous rate and the dust injectors shall disperse the dust
uniformly across the air inlet face of the test filtration system. The dust
injectors shall be configured per Figure 3F of SAE J 726, 1993 edition.
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1.2.1 The test dust shall be silica and shall have a particle size distribution
within the limits shown on Standard Drawing AE-036005.
1.3.1 The test airflow shall be maintained constant throughout the efficiency
and dust capacity tests and shall not be less than in the proposed design.
1.3.3 The test dust feed rate during the dust capacity test and the dust/NaCl
mixture during the efficiency test shall be maintained constant at an inlet
concentration of 0.57 g/m³.
1.3.4 The minimum relative humidity during the dust capacity test shall be
40% and at least one of the efficiency tests shall be conducted with an air
inlet relative humidity in excess of 90%.
1.3.5 The NaCl capture efficiency shall be based on the theoretical upstream
and measured downstream NaCl concentrations. The quantity of test
dust and the quantity of air sampled shall be selected to give a measured
downstream sodium quantity of at least 5 times the minimum sensitivity
of the sodium measuring instrument.
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1.4.2.2 The phase 1 test shall be conducted at the proposed flow rate,
with test dust as defined in paragraph 1.2 of Appendix II at an
inlet concentration of 0.57 g/m³ until the stabilized pressure
drop is attained. The time to reach this pressure drop shall be
recorded. The efficiency test shall be conducted at sufficient
points during the period to determine the time and pressure
drop at which the minimum NaCl capture efficiency of 99.95%
is attained.
1.4.2.3 The phase 2 test shall continue on from the phase 1 test
utilizing the same equipment and filter elements. Test dust, as
defined in paragraph 1.2 of Appendix II shall be fed
continuously at an inlet concentration of 0.57 g/m³ for a
minimum period of 50 hours. System pressure drop, first stage
pressure drop if applicable, relative humidity, and dust feed
shall be recorded hourly. NaCl capture efficiency shall be
determined at the end of each 10 hour period. During this
phase, the measured NaCl capture efficiency shall be not less
than 99.95% and the system resistance shall not show a rising
pressure characteristic.
1.4.2.4 The phase 3 test shall be conducted at the end of the 50 hour
period. The pulse clean mechanism shall be deactivated and
test dust shall be fed continuously at 0.57 g/m³ until the
pressure drop across the self-cleaning stage reaches 2.5 kPa (10
inches water gauge). At this point, NaCl capture efficiency,
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The time taken to reach 2.5 kPa (10 inches water gauge)
pressure differentials, the number of pulse clean cycles and the
time taken to clean back to the stabilized system operating
pressure shall be recorded.
1.4.3.1 The Vendor shall furnish certified evidence that filter elements
are able to withstand rough handling. This may be
demonstrated by a minimum of 15 (fifteen) hours continuous
shaker testing to U.S. Army Corps Manual 136-300-178
without sustaining structural damage or loss of dust collection
efficiency. Shaker testing shall be performed on the filter
element alone without transport packaging.
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The test report shall include, but shall not be limited to, the following material:
1. Sketches showing the overall test set-up and details of each of the systems
outlined in paragraph 1.1, including make and model of all measuring
instruments and equipment.
2. A graph of initial system resistance as a function of volumetric flow.
3. Composite graphs of system resistance, NaCl capture efficiency and
relative humidity as a function of time.
4. Certified results of laboratory tests and rough handling tests on individual
elements.
5. Supportive test or operating experience, if available, demonstrating
minimum 2 years’ operating life of filter media.
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