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FEATURE
Sealing Technology January 201310
Tests reveal performance of seals for cable and pipe transits
The firm’s Dynatite sealing system – which was originally developed for use in columns in semi-submersible offshore rigs, following incidents where traditional cable transit systems suffered catastrophic failure under high pres-sure – has been successfully exposed to a series of hydrostatic shock tests. The tests, conducted at pressures up to 15 bar, were surveyed by the American Bureau of Shipping (ABS).
The sealing system consisted of sealing plugs, flanged conduit sleeves and Nofirno gaskets. In this case, the gaskets were also exposed to extremely high, shock pressure loads.
The test started with a shock pressure of 5 bar, held for 30 minutes. After the pressure was released, the system was exposed to a shock pressure of 10 bar (held for 30 minutes, before the pressure was again released), and finally a shock pressure of 15 bar, which was maintained for two hours. The pressure was released for 30 minutes and then once again 15-bar shock pres-
sure was applied and held for 30 minutes. At 30-minute intervals the pressure was decreased in increments of 5 bar to 1 bar – bringing the total test time, per plug, to 6 hours. Each plug series was exposed to five pressure tests.
The sealing system was developed for instan-taneous (dynamic) pressure loads, but also can be used for static pressure. It can be used in blast walls, explosion-proof areas, sub-sea applications and situations where (sudden) substantial pres-sure might arise and a high degree of (instanta-neous) tightness of the sealing system is required.
For optimum performance in the long term, a combination of Dynatite sealing plugs with exact-fitting, non-corroding Dynatite conduit sleeves (for welding, bolting or screwing) need to be used. These sleeves have been tested accord-ing to a standard, salt spray test and, says the company, will show no signs of corrosion when exposed to a sea-water environment for a period of 20 years.
Fire testBeele Engineering also reports that its Slipsil and adapter plugs have been able to with-stand a two-hour fire test for building applications.
The plugs, which are made from Nofirno rubber, have been specially developed for fire-resistant, gas-tight and waterproof sealing of lead-throughs for one or more metal or plastic tubes. The company says they are easy to install and can be exposed to a high pressure immedi-ately after installation.
Slipsil plugs on their own, and in com-bination with Slipsil adapters, successfully passed the fire test that was carried out in accordance with the NEN-EN 1366-3:2009 standard. The test was performed with lead-throughs of copper and steel tubing in a wall of cellular concrete blocks. All 14 plug configurations successfully withstood the test and, therefore, can be used in all common types of concrete and cellular concrete walls in the building sector. The integrity and thermal insulation of the Slipsil (adapter) plugs meet classifications E 120-C/U and EI 120-C/U, in accordance with the EN 13501-2: 2007 standard.
The lead-throughs tested used fire-resistant plastic sleeves developed by Beele Engineering, which were inserted into pre-drilled holes in a wall. These also can be cast into normal concrete. After installing the steel and copper pipes, the lead-through sleeves were sealed with Slipsil plugs and Slipsil adapter plugs. The adapter plugs have been developed for over-sized lead-throughs, and can be installed in the standard Slipsil plugs.
The rubber used to make the Slipsil (adapt-er) plug retains its properties over the long term and is resistant to the effects of weather-ing, ultraviolet light, ozone, shocks and vibra-tions. The material can be used in applications involving temperatures of –50°C to +180°C – enabling the plugs to be used both under ‘‘arctic conditions’’ and in conjunction with hot, steam pipes.
Contact:
Beele Engineering Bv, Beunkdijk 11,
7122 NZ Aalten, The Netherlands.
Tel: +31 54 346 1629,
Email: [email protected], www.beele.com
Beele Engineering Bv’s Dynatite sealing system – sealing plugs, flanged conduit sleeves and Nofirno gaskets – undergoing hydrostatic shock tests.
Beele Engineering Bv, a Dutch company that specialises in fire-resistant and gas-tight and water-tight sealing technology for cable and pipe transits, reports that two of it products – Dynatite and Slipsil – have performed well in a series of recently conducted tests.
