EXPO ML576 User manual

ML576
|
v2 28-Feb-2020
ASU-0000-009 - Air Isolation Unit Manual
ML576
IMPORTANT NOTE
It is essential for safety that the installer and user of the Expo system observe
the following instructions:
Please refer to the standard for principles and definitions.
(N.B. These instructions apply only to the Pressurizing system. It is the responsibility of the manufacturer
of the Pressurized Motor Enclosure to provide appropriate instructions for the Enclosure.)
Contents
1. ASU-0000-009 - General System Specification
2. Quick User Guide
3. Application Suitability
4. Description and Principle of Operation
5. Main Components
6. Installation of the System
7. Commissioning
8. Maintenance of the System
9. Fault Finding
10. Recommended Spares List
11. Drawings and Diagrams

ML576 | v2 Page
1
Expo Technologies UK
T: [phone]
E: [e-mail]
Expo Technologies US
T: [phone]
E:[e-mail]
Expo Technologies China
T: [phone]
E: [e-mail]
1. ASU-0000-009 - General System Specification
Technical Specifications
Part number: ASU-0000-009
Enclosure Material: Stainless Steel 316L.
Mounting Method: Wall mounting straps. Fixing holes as per drawing.
Temperature Limits: -20oC to +55oC
Compressed Air Supply: Clean, dry, oil free air or inert gas. Refer to Air Supply Quality section
in Installation of the System. Supply Pressure: 5.2 to 8 barg (75.4 to 116
psi).
Process Connections: Purge supply and outlet to pressurized enclosure 2” NPT female.
Minimum supply line 50 mm (2”) ID tube, inlet sized appropriately for
flow rate.
Filter Drain 1/8”NPT female, minimum 6 mm pipe to be used.
2. Quick User Guide
Installation
The Air Isolation unit must be installed by a competent engineer, in accordance with relevant standards and
any local codes or practice.
• Ensure the system is installed according to the full instructions in the “Installation of the System”
section of this manual.
• All piping’s must be clean and free of dirt, condensation and debris prior to connection to the system or
pressurized enclosure.
• It is strongly recommended that a local isolation valve is installed on the air supply upstream of the
system.
Note: Most faults are due to restricted air supply, inadequate supply pipe work or drop in air supply
pressure during the purge process.
3. Application Suitability
Air isolation unit systems are acceptable for use in Hazardous Areas, where the Hazardous Area is non-mining
(i.e. above ground) and the hazard is caused by flammable gases, vapours or dust.
The following are main materials of construction of the Air isolation unit. If substances that will adversely affect
any of these materials are present in the surrounding environment, please consult Expo for further guidance.
Materials of construction:
 Stainless Steel
 Brass
 Silicone Rubber
 PTFE

Page
2
ML576 | v2
Expo Technologies UK
T: [phone]
E: [e-mail]
Expo Technologies US
T: [phone]
E:[e-mail]
Expo Technologies China
T: [phone]
E: [e-mail]
4. Description and Principle of Operation
The Air isolation unit is designed to supply filtered air to a purge system from a remote location.
Filter elements can be changed without the need for switching off the air supply
To initially operate the system, all two-way valves must be closed prior to air being applied to the system.
Once the two-way valves are closed air can be supplied to the system.
To send airflow to the top filter, the red handle of the three-way L ported valve should be turned 90 degrees
anticlockwise and left in a horizontal position.
To send airflow to the bottom filter, the red handle of the three-way L ported valve should be turned 90
degrees clockwise and let in a vertical position.
Once the chosen filter (top or bottom) has been selected via the three-way L ported valve.
The two-way valve next to the chosen filter needs to be opened (rotate clockwise 90 degrees).
To change the filter that airflow is being directed to whilst the system in Operation, the following steps need to
be followed.
Check that the small two-way valves located at the bottom of each filter are normally closed.
To change the filter airflow is going to, the three-way valve needs to be rotated 90 degrees.
The filter that was previously in use needs to be drained and relieved of air via the small two-way valve located
at the bottom of the filter underneath the pressure gauge.
The two-way valve next to the filter that was previously in use needs to be closed and the two-way valve next
to the filter in use needs to be opened. Following this both small two-way valves located at the bottom of each
filter should be normally closed
5. Main Components
Air Supply Filter
The unit is provided with x2 40µ liquid / dust filter elements. The user of the Air isolation unit must ensure that
air supply is to the quality stated in Air Supply Quality paragraph found in the Installation of the System
section.
The system is designed so that air should only flow through one filter at any time.
6. Installation of the System
The Air isolation unit must be installed by a competent person in accordance with relevant standards, and local
codes of practice.
Copies of the Current Standard can be purchased from Expo Technologies or B.S.I or relevant local code /
Standard.
Air Supply Quality
The Air isolation unit system should be connected to a protective gas supply, which is suitable for purging and
pressurization.
The supply pipe connection to the air isolation unit must be appropriate for the maximum input flow rate for the
application.
The air supply must be regulated at a pressure less than the maximum stated inlet pressure.
The air supply must be: clean, non-flammable and from a non-hazardous location. The air should be of
Instrument Air Quality. Although the purge control system will operate with lower air quality, its operational life
will be adversely affected. The equipment that is being protected by the air isolation unit may also suffer
because of poor air quality.
With reference to BS ISO 8573-1: 2010, Instrument Air is typically specified as:
Particle Class 1
In each cubic metre of compressed air, the particulate count should not exceed 20,000 particles in the 0.1 to
0.5 micron size range, 400 particles in the 0.5 to 1 micron size range and 10 particles in the 1 to 5 micron size
range.
Humidity or pressure dew point
The dew point, at line pressure, shall be at least 10°C below the minimum local recorded ambient temperature
at the plant site. In no case, should the dew point at line pressure exceed +3°C.

ML576 | v2 Page
3
Expo Technologies UK
T: [phone]
E: [e-mail]
Expo Technologies US
T: [phone]
E:[e-mail]
Expo Technologies China
T: [phone]
E: [e-mail]
Oil Class 2
In each cubic metre of compressed air, not more than 0.1mg of oil is allowed. This is a total level for liquid oil,
oil aerosol and oil vapour.
When an inert gas is being used to supply the purge system, risk of asphyxiation exists. Refer to Application
Suitability section.
Before connection of the air supply to the purge system, the supply pipe work should be flushed through
with instrument quality air to remove any debris that may remain in the pipes. This must be carried out for at
least 10 seconds for every meter of supply pipe.
Unless a supply shut-off valve has been fitted to the air isolation unit system, an external shut-off valve with
the same, or larger, thread size as the Control Unit inlet fitting should be fitted by the installer to prevent any
restriction of purge flow.
The purge air from the air isolation unit should be piped within the pressurized enclosure to ensure
purging of potential dead air spots.
The purge system is fitted with an internal regulator factory set to 3 bar feeding the logic.
When an inert gas is being used to supply the air isolation unit, risk of asphyxiation exists. Refer to Application
Suitability section. Before connecting the air supply to the Air supply isolator, the supply pipe work should be
flushed through with instrument quality air to remove any debris that may remain in the pipes. This must be
carried out for at least 10 seconds for every metre of supply pipe.
Instrument Air Quality
Solid Particles 0.5 μm < particle size ≤ 1 μm, maximum 1000 particles / m3
Residual Water 1μm maximum density, +3oC* pressure dewpoint
Oil Content ≤ 0.01 mg / m3 concentration total oil

Page
4
ML576 | v2
Expo Technologies UK
T: [phone]
E: [e-mail]
Expo Technologies US
T: [phone]
E:[e-mail]
Expo Technologies China
T: [phone]
E: [e-mail]
7. Commissioning
Initial Commissioning.
Refer to the General Arrangement (GA) drawing for the Air Supply Isolator systems operating layout.
If, after commissioning, the system does not perform as expected, refer to the Fault Finding Section.
Follow these steps:
1. Disconnect the air supply pipe from the inlet to the Air Isolation unit system.
2. Flush the pipe through with instrument quality air to remove any debris. This must be carried out for at
least 10 seconds for every metre of supply pipe.
3. Check all connections between the system and the downstream motor purge unit.
4. Close and re-open the internal valves. See No. 3 and 6 in the GA drawing.
8. Maintenance of the System
The maintenance recommended for the system consists of the following, supplemented by any additional local
requirements imposed by the local Code of Practice.
Expo recommends that the commissioning tests be repeated at every six to 24 months, dependent on the
environment. In addition the following checks are also recommended at that time:
 Check the condition of the air supply filter element. Clean or replace it as necessary.
At least every two years, the following additional checks are recommended:
 Apparatus is suitable for the Hazardous Location
 There are no unauthorized modifications
 The source of air is uncontaminated
 Approval labels are legible and undamaged
 Adequate spares are carried
9. Fault Finding
If the system does not behave in the manner described above there is a fault. Some of the more likely faults
are dealt with below. If a cure cannot be affected by following the procedure shown below please call Expo (24
hour answering) or your supplier for further assistance.
Check components by substitution only after establishing that such action is necessary. If the system is less
than 12 months old, parts under warranty should be returned to Expo for investigation, with a full report of the
fault and the system Serial Number.
As with any pneumatic system the greatest enemies are water, oil and dirt in the air supply. For this reason the
air system must always incorporate a dust and water filter to provide air to instrument quality.
10. Recommended Spares List
KFL-A01N-001 Filter kit for S0015/275 filter/regulator
11. Drawings and Diagrams
The following drawings are attached:
Title Drawing Number Sheet(s)
Air Isolation Unit 2” ASU-0000-009-GA 1 of 2 & 2 of 2

1100 ENCLOSURE WIDTH
= 900 = MOUNTING HOLES
1050 OVERALL HEIGHT
= 1000 = MOUNTING HOLES
950 ENCLOSURE HEIGHT
14 THRU TYP
1192 OVERALL WIDTH
=1020= LIFTING EYES
C
L
C
L
3x DOOR LOCKS
AIR INLET 2" NPT (F)
AIR OUTLET 2" NPT (F)
476 OVERALL DEPTH
206
720
6
720
206
2x M12 REMOVABLE LIFTING EYES
535
565
225
548
50
2x FILTER DRAIN 1/8" NPT FEMALE
2x BLACK PLASTIC BREATHER
EXTERNAL EARTH STUD & LABEL
8
4
REVISION TABLE
REV.
MOD NUMBER
APPROVED DATE
APPROVED
C
6764
19/09/2019
PB
03 6764
19/09/2019
PB
04 6790
20/02/2020
PB
B
C D
E
F
857 6 4 3 1
2
3RD ANGLE
PROJECTION
The contents of this drawing / document are Copyright © Expo Technologies Limited. They are to be treated as confidential and are returnable upon request. They are not to be copied or communicated in part or in whole without written consent from Expo Technologies Limited, neither are they to be used in any way against our interests.
FLATNESS TO BE LESS THAN 0.4 OVER ANY 100mm LENGTH
X ±0.5 X.X ±0.2 X.XX ±0.1
DIMENSIONS IN mm [ ] DENOTES IMPERIAL
53347
FIRST USED ON
WEIGHT
(Kg)
TITLE
AIR ISOLATION UNIT 2"
Expo Technologies Limited
SURREY TW16 5DB UNITED KINGDOM
IF IN DOUBT ASK
FINISH MATERIAL
SEE PART DETAILS
SEE PART DETAILS
DO NOT SCALE
TOLERANCES
UNLESS OTHERWISE STATED
ANGLE
DECIMALS
STD
1
A3
04
SHEET No.
1:10
SCALE
REV.
DRAWING No. ASU-0000-009
1
OF
2
06/06/2018
DRAWN DATE: DRAWING STATUS:
RELEASED
APPROVED
CHECKED
DRAWN
NH
KM
PB
A

15
12 18 24 22 17
15
6
11
10 13
330
5 9
14
1
15 15
15
15
15
4 5
12
4
12
26
12
2120
29
7 1923
23
28 277
7
31
FRONT VIEW DOOR ASSEMBLY NOT SHOWN FOR CLARITY
NOTE: SEE DRAWING ASU-0000-009-MF FOR FULL DETAILS
4
ITEM
PART NUMBER
DESCRIPTION
QTY
1
ASU-0000-009
HOUSING
1
3
S0514-001
BLACK PLASTIC BREATHER
2
4
TTA-28J0-0S0
2" NPT (F) TO 2" BSP (M) ADAPTOR
2
5
TUC-3JV0-0S1
2" BSPPF to 2" BSPTM UNION CONICAL
TIGHTENED
2
6
TUC-4JJ0-0S2
2" EQUAL UNION BSPP F-F, 316ss 2G thread to
ISO-228
1
7
S0024-175
BULKHEAD 1/8"NPT FEMALE X 5mm FEMALE 4
8
MLA-PDZ0-006
LABEL MAINS EARTH CIRCULAR
1
11
TTT-5JJ0-0S0
2" BSPP EQUAL FEMALE TEE 316 ST STEEL
1
12
TTE-3JJ0-0S0
2 INCH 90 DEG ELBOW F-F STAINLESS STEEL
4
13
HVP-B000-016
TWO WAY VALVE 2 INCH
2
14
HVP-B000-017
THREE WAY VALVE 2 INCH
1
15
TTR-3EFK-0S0
2" THREADED RUNNING NIPPLE (SEE SHEET 2)
7
17
FNP-51F0-00S
2" BSP NUT
22
18
S0018-156
Copper Washer 2" BSP
20
19
S0018-019
COPPER WASHER 1/4" BSP
4
20
FWM-60E0-00N
68.8 OD, 60ID, 5.5 THK NYLON WASHER
4
21
FBM-1015-2F0
U bolt M10 OD of pipe 61mm
1
22
MBK-S000-747
SLOTTED PIPE HOLDING BRACKET
1
23
S0015-018
PRESURE GAUGE
2
24
HTS-A200-803
2" S/STEEL PIPE THREAD BOTH ENDS
1
25
RLCI-04025-J
NUTSERT CLOSED M4
9
26
HF1-A01N-006
2 INCH FILTER
2
27
TPE-106M-0P0
STUD ELBOW 1/8"BSPT x 6 OD PUSH IN
2
28
TPE-406N-0N0
STUD FEMALE ELBOW 1/4" BSPTx6od LOW
PROFILE
2
29
HTS-A200-818
2" S/STEEL PIPE THREAD BOTH ENDS
1
30
MLA-PAZ0-170
FILTER DRAIN LABEL
1
31
S0096-004
M12 LIFTING EYE BOLT
2
B
C D
E
F
857 6 4 3 1
2
3RD ANGLE
PROJECTION
The contents of this drawing / document are Copyright © Expo Technologies Limited. They are to be treated as confidential and are returnable upon request. They are not to be copied or communicated in part or in whole without written consent from Expo Technologies Limited, neither are they to be used in any way against our interests.
FLATNESS TO BE LESS THAN 0.4 OVER ANY 100mm LENGTH
X ±0.5 X.X ±0.2 X.XX ±0.1
DIMENSIONS IN mm [ ] DENOTES IMPERIAL
53347
FIRST USED ON
WEIGHT
(Kg)
TITLE
AIR ISOLATION UNIT 2"
Expo Technologies Limited
SURREY TW16 5DB UNITED KINGDOM
IF IN DOUBT ASK
FINISH MATERIAL
SEE PART DETAILS
SEE PART DETAILS
DO NOT SCALE
TOLERANCES
UNLESS OTHERWISE STATED
ANGLE
DECIMALS
STD
1
A3
04
SHEET No.
1:6
SCALE
REV.
DRAWING No. ASU-0000-009
2
OF
2
06/06/2018
DRAWN DATE: DRAWING STATUS:
RELEASED
APPROVED
CHECKED
DRAWN
NH
KM
PB
A

[ThisPageIntentionallyLeftBlank]

[ThisPageIntentionallyLeftBlank]

[ThisPageIntentionallyLeftBlank]

Expo Technologies USA
Expo Technologies Inc.
9140 Ravenna Road Unit #3
Twinsburg,
OH 440878, USA
T: [phone]
F: [phone]
E: [email protected]
Expo Technologies UK
Expo Technologies Ltd.
Unit 2 The Summit, Hanworth Road
Sunbury-On-Thames,
TW16 5DB, UK
T: [phone]
F: [phone]
E: [email protected]
Expo Technologies China
Qingdao Expo M&E Technologies Co. Ltd
329 Huashan Er Lu
Jimo City, Qingdao,
266200 China
T: [phone]
F: [phone]
E: [email protected]m
www.expoworldwide.com