New Conduit Sleeves for Dynatite Sealing System

Beele Engineering has extended its dynamic sealing system Dynatite with conduit sleeves for application in harsh environments and salt water. Specially developed for application in the columns of semi-submersible rigs, the Dynatite system can be used in many hazardous areas as blast walls, explosion proof areas, subsea applications and all those situations where a (sudden) substantial pressure might arise and a high degree of (instantaneous) tightness of the sealing system is required.

The conduit sleeves are available in three types that can be welded (new installations), bolted or screwed (existing installations) to the partition or wall. A retainer flange at the back of the conduit sleeves functions as a hold for the Dynatite sealing plug to allow compression of the plug inside the conduit sleeve. The higher the pressure load, the more compression with an increasing tightness. The Dynatite plugs can easily withstand shock pressure loads of more than 210 psi (15 bar) and will return to their original shape after shock pressure. The dynamic compression of the plug is based on the high-tech rubber grade and the engineered profiling.

The new conduit sleeves are made of stainless steel 1.4571, milled to exact internal dimensions and CDW seam welded to the retainer flange. To optimize corrosion resistance, the conduit sleeves are surface treated on the basis of a unique passivation process, that prevents corrosion for a service life up to 15 years. The inner surface of the conduit sleeve is also treated thus avoiding corrosion on the inside as well and guaranteeing optimum gliding properties of the rubber during service life.

The inner surface of the conduit sleeves for welding are treated with a silicon dioxide ceramic coating that is fire resistant and heat resistant up to 500° C. Combined with flange thickness of 8 mm, the ceramic coating will not be affected by the heat when the conduit sleeve is welded into the partition.

The inner surface of the conduit sleeves for bolting or screwing has a black PTFE coating. These sleeves are developed for existing installations. For the conduit sleeves with bolting flange, special profiled gaskets are supplied. The gaskets, made of Nofirno rubber, make excessive compression or retightening of the bolts unnecessary.

The Nofirno rubber, used for the sealing plugs and gaskets, does not age and will maintain its flexibility on long term. Service life easily exceeds 50 years under normal environmental conditions. The rubber can be used in a very wide temperature range. Even at low temperatures down to -50° C the rubber stays flexible. This guarantees tightness at such low temperatures. Nofirno rubber is made of a high grade, inert silicone polymer.

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