Oval handhole, head and manhole gaskets for boilers with TÜV approval

Boilers with an oval barrier system are equipped with an inner cap, which is tightened using the nut across bolts and brackets and work self-sealing at inner overpressure.

IDT-Profiles FD 01, FD 20, FD 30, WD 10, WD 30, WD 39

Situation

Image 1

Image 2

Asbestos-free soft material gaskets were developed and implemented by different manufacturers due to the banning of asbestos materials for sealing systems in boilers.
Unfortunately some of these constructions my lead to dangerous accidents, due to the seal being pressed out of its seat.
This caused the German authorities (VdTÜV und FDBR) to point out possible dangers and to develop the requirements „Information Sheet 100“ for oval handhole, head and manhole gaskets in boilers.
This information sheet includes the requirements for clamp systems and gaskets, the test conditions and the labelling of the gasket.
The tests are carried out by VdTÜV.
In the event of a positive test result a component label is issued which has to be used on the parts-tested gasket. Only TÜV-approved gaskets may be used after notification and transitional period.

IDT has developed the sealing designs as shown in cross-section in image 2 and received test certificates. The following aims were applied:

blow-out safety (shaft ring, flange)
reduced leakage
high compensation capability (shaft ring)
prevention of graphite abrasion due to operating medium (flange)
easy handling high age and chemical resistance

The IDT-gaskets comply with the test requirements of the VdTÜV-information sheet “gaskets 100”, TRD 401, annex

All designs have the following TÜV-certificate:

permissible operating overpressure p = 40 bar
permissible operating temperature T = 250 °C
permissible cold water test overpressure p’ = 88 bar

The choice of the relevant and most effective design variation is carried out according to the condition of the load system.
Each gasket is delivered with a detailed installation and assembly instructions which includes amongst other the following information: