Welker ALS-4 Installation, Operation And Maintenance Manual

PRODUCT DESCRIPTION
• Acts as a final defense that
protects analyzers from damage
and contamination caused by
liquids in gas samples.
• Gas flows freely through the
ALS-4 Analyzer Liquid Shutoff.
But if liquid tries to pass through,
the internal floating ball will seal,
thereby shutting off the flow of
liquid to the analyzer.
SPECIFICATIONS
Products
Gases Compatible With the Materials of
Construction
Materials of Construction
316/316L Stainless Steel, PTFE, FKM
(Others Available)
Maximum Allowable Inlet Pressure
148.9 barg
2160 psig ( )
Temperature Range
-20 °F to 120 °F (-28.8 °C to 48.8 °C )
Connections
Inlet: ¼" FNPT
Outlet: ¼"
Approximate Dimensions
2¼" x 2" x 2" (L x W x H)
Approximate Weight
1½ lb
Maintenance Schedule
Every 12 Months
Severe Service, Dirty Conditions,
Excessive Usage: More Frequently
Option
High Capacity
The following procedures have been
written for use with standard Welker®
parts and equipment. Assemblies that
have been modified might have
additional requirements and
specifications that are not listed in this
document.
Maintenance Tip
When installing new seals supplied in
spare parts kits, for sample-exposed
seals, Welker® recommends
non-hydrocarbon-based lubricants,
such as Krytox®. For non-sample-
exposed seals, Welker® recommends
either non-hydrocarbon-based
lubricants or silicone-based lubricants
such as Molykote® 111.
If you received a damaged
ALS-4 Analyzer Liquid Shutoff,
please contact a Welker®
representative immediately.
For all product inquiries, please
contact our Service Department:
281.207.1887
INSTALLATION, OPERATION, AND MAINTENANCE MANUAL
WELKER® ALS-4 ANALYZER LIQUID SHUTOFF
The installation, operation, and maintenance liability for this equipment becomes that of the purchaser at the time
of receipt. Reading the instructions that comprise IOM-272 prior to installation and operation of this equipment is
required for a full understanding of its application and performance prior to use.
ALS-4: INSTALLATION AND OPERATION
Installing and Operating the ALS-4 Analyzer Liquid Shutoff
1. Halt all product flow to the analyzer.
2. Be certain that there is a valve between the ALS-4 and the analyzer and also a valve upstream of the ALS-4.
Upstream and downstream valves are necessary in order to purge the sample line of liquids in the event liquids
reach the ALS-4 and shut off flow to the analyzer.
3. Connect the product supply to the inlet port of the ALS-4 (
The ALS-4 must be installed vertically with the inlet port pointing down..
Welker® recommends installing a Welker® LE-2 Liquid Eliminator upstream of the ALS-4.
4. Connect the outlet of the ALS-4 to the analyzer (
5. Purge the sample line prior to beginning operation. See
6. After the sample line has been purged, begin product flow to the ALS-4, thereby putting it into service.
7. Whenever liquids reach the ALS-4, it will shut off all flow to the analyzer. Therefore, the sample line must then be purged before flow
can be resumed.
Purging the Sample Line
1. Be certain that the purge valve and the purge drain valve are closed.
2. Connect a safe auxiliary pneumatic supply to the purge valve. Welker® recommends using helium as the auxiliary pneumatic
supply because helium will purge AND dry the sample line. However, nitrogen or natural gas from the pipeline may also be used.
3. If any sample devices are installed between the ALS-4 and the purge drain valve, make certain that their outlet valves are open.
This will allow any liquids present in the ALS-4 to be purged to the drain.
4. Open the outlet valve on the auxiliary pneumatic supply.
5. Open the purge valve. This applies pressure to the ALS-4, and any
liquids in the ALS-4 will be forced to the purge drain valve.
6. Open the purge drain valve in order to drain any liquid from the
system.
7. When all liquids have been drained from the purge drain valve,
close the outlet valve on the pneumatic supply. Then close the
purge valve and purge drain valve.
8. Disconnect the auxiliary pneumatic supply from the purge valve.
9. Purging is now complete. The ALS-4 may be returned to operation.
ALS-4: MAINTENANCE
1. Halt product flow to the ALS-4.
2. Depressurize the ALS-4.
3. Disconnect all tubing from the ALS-4 and remove the ALS-4
from the system.
4. Unscrew the body from the cap (
5. Replace the ball seal O-ring ( Figure 1
6. DO NOT lubricate the ball seal O-ring.
7. Replace the O-ring in the cap (
8. Inspect the ball for scratches or wear. Replace as necessary.
9. Return the ball to the cap.
10. Return the body to the cap. Tighten firmly.
11. The unit is now ready for reinstallation.
New seals supplied in spare parts kits should be lightly lubricated (for lubricant recommendations, see
Maintenance Tip
) before being installed to ease their installation and reduce the risk of damage when positioning
them. Wipe excess lubricant from the seals, because it could adversely affect analytical instrument results.
IOM-272 | REV. 0 | 02/10/2025
Figure 1 ).
Figure 1 ).
Purging the Sample Line
Figure 1
).
) in the body.
Figure 1 ).
-4.
-4.
, below.
Figure 1: Welker® ALS-4 Analyzer Liquid Shutoff Diagram
Interior View