5
IOM-6A00
SECTION V
V. MAINTENANCE
Attention! Maintenance shall only be carried out by instructed qualified staff! All parts of the Maintenance Kit A
(See Section VI) must be kept at hand.
As operational conditions do fluctuate, there is no temporal maintenance interval suggested.
We recommend the operational state of the flame arrestor be checked every 6 month. Not only the external housing
of the flame arrestor but also the crimped metal ribbons shall be checked for buildup of impurities, corrosion and
deformation. The function of the resistance thermometer, if present, should also be checked periodically.
Bolts / nuts shall be tightened to the torque values as listed below.
Should there be an explosion without or with stabilized burning at the flame arrestor, the flame arrestor must
be removed and checked by an instructed qualified staff member. Depending on the explosion or degree of
combustion, exchange of the crimped metal ribbon and the other spare parts may be sufficient to rebuild and re-
install. However, when considering the year of manufacture, replacement with a new flame arrestor may often
be the cheaper way. Flame arrestors with resistance thermometers shall be inspected to check the functioning
of the resistance thermometer after every maintenance / cleaning. The reinstallation into the complete system is
carried out according to Section IV.
Only use Cashco manufactured parts when it is necessary to replace single component parts.
Item
No. Mat.
Torque [Nm]
DN20-DN32
(3/4”-1-1/4”)
DN40/DN50
(1-1/2”/2”)
DN65/DN80
(2-1/2”/3”)
DN100
(4”)
DN125/DN150
(5”/6”)
DN200
(8”)
DN250
(10”)
DN300
(12”)
6, 7 CS 27 54 93 230 465 800
SST 25 45 80 185 400 680
8 SST 12 12 25 45 185 400 680
CS - Carbon Steel, SST = Stainless Steel
WARNING
SYSTEM UNDER PRESSURE. Prior to performing
any maintenance, isolate the regulator from the
system and relieve all pressure. Failure to do so
could result in personal injury.
For planned maintenance and cleaning, the flame arrestor can be easily dismantled. Rotate threaded bolt nuts (7)
counter clockwise and remove. Separate the two housings and remove the element (3).
For minimum residue buildup - the flame arrestor element is to be blown out with compressed air or superheated
steam opposite the normal operating flow direction.
For major residue buildup on the crimped metal ribbons, the flame arrestor element may be rinsed with a cleaning
compound compatible to the application fluid and in accordance with owner’s procedures.
Mechanical damages to the beading must be prevented! If the crimped metal ribbon within the element has been
damaged mechanically or chemically (corrosion), or if more than 20% of the cross-section area is plugged after
cleaning, replace the element (3). The element must be completely dry before reinstalling it between the housing
covers. Install new round ring(s) (5) each time the flame arrestor is dismantled. Insert threaded bolts (6) through
the two housing covers and with a alternating, crossing pattern secure nuts (7) finger tight. Use a torque wrench
and complete the tightening per the value as listed below. Finally, recheck the torque value of the center bolt / nut
(8) per the value as listed below.
Maintenance procedures hereinafter are based upon
removal of the unit from the pipeline where installed.
