27
IOM-022
MODEL: GSS-4PM
REV: F
13839 West Bellfort Street, Sugar Land, TX 77498
welker.com
Service Department 281.491.2331
3.4 Purging and Cleaning the Sample Cylinder
Regular cleaning of the sample cylinders is essential for proper functioning of the unit. For cylinders used for sample
containment, any debris or residue left in the sample cylinders may contaminate the results of later samples collected in the
sample cylinders.
Welker recommends routinely inspecting the sample cylinders for any dents, damage, and/or signs of misuse, as these may
affect proper functioning of the unit. If any dents, damage, and/or signs of misuse are present, please contact Welker for service
options.
Purging
Purging With Helium
1.
Fill the sample cylinder with helium, and then empty the cylinder. Repeat several times.
2.
Take a sample of the helium and test it for trace amounts of hydrocarbons.
3.
If hydrocarbons and/or contaminants are present in the analysis, the sample cylinder has not been adequately cleaned
and further purging of the sample cylinder is necessary; repeat steps 1 and 2. If hydrocarbons and/or contaminants
remain present after repeating steps 1 and 2, a solvent cleaning may be necessary.
4.
Purging is complete when no hydrocarbons and/or contaminants are present in the analysis.
Purging With New Product
Purge the sample cylinder with the product to be sampled. This can be accomplished each time the sample cylinder is put into
service. See
Section 2.3, Start-Up Procedures,
for instructions on purging the sample cylinder with new product.
This method is only advisable if the sample cylinder will be used in the same location to sample the same type of product.
Cleaning
Cleaning With Solvent
1.
Repeatedly flush the sample cylinder with solvent.
2.
Use helium to dry the sample cylinder.
3.
Purge the sample cylinder with helium to remove any remaining solvent.
4.
Take a sample of the helium and test it for trace amounts of solvent and hydrocarbons.
5.
If solvent and/or hydrocarbons are present in the analysis, the sample cylinder has not been adequately cleaned and
further solvent cleaning and/or purging of the sample cylinder is necessary. Steps 1 and 2 may need to be repeated.
Repeat steps 3 and 4.
6.
If solvent and/or hydrocarbons remain present after repeating steps 3 and 4, a steam and vacuum cleaning may be
necessary.
7.
Solvent cleaning and purging are complete when no solvent or hydrocarbons are present in the analysis.
Other Cleaning Options
Welker recommends the Welker CSVC Cylinder Steam & Vacuum Cleaner for sample cylinder steam cleaning.
