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Thorne & Derrick
Sealed ducts

CSD Sealing Systems have specialised in the supply of technically advanced cable transit, pipe penetration and cable duct seals within the UK for over 20 years. CSD understands the challenges of the rail industry and all of the products are designed and tested to reduce the risk of explosion or spread of fire and provide flood protection, safeguarding assets, buildings and personnel.    

The CSD Sealing Systems retain extremely high levels of protection and are age tested to ensure no deteriation in performance in excess of 50 years.

CSD sealing products have been developed by Beele Engineering/CSD International, a company with over 40 years experience of development and production in this field. CSD clients can be assured of first class products and first class service, whatever their industry.

CSD RISE Duct Seals Selected For Major Network Rail Project Download the CSD Product Brochure
CSD Brochure
CSD pipes CSD pipes

CSD Benefits

CSD RISE cable duct sealing kits provide an effective and simple solution for all gastight, watertight and fireproof duct sealing requirements - ideal for triplex cable duct sealing into high voltage substations, 11kV-33kV.

Duct Seal Blogs......

High Voltage, High Specification Cable Duct Sealing For Network Rail Power Integrity

CSD RISE Duct Seals Selected For Major Network Rail Project

Under-Specified Cable Duct Seals Can Leave You & Your Client In Deep Water

Cable Duct Seals : Reduce Risk. Stay Safe. Stick To The Spec

Another Duct Sealing Puzzle Solved By T&D & CSD

T&D Specify & Supply CSD RISE Cable Duct Seals To New Major Project

The Silver Bullet Duct Seal

You Can't Control The Weather. But You Can Contain The Flood.

Petrol Station Forecourt Ducts Sealed

Superior Sealing : Water, Gas & Fire Protection for Rail Cables

CSD RISE Cable Duct Seals protect LV-HV power, S&T cables and equipment on Network Rail infrastructure.

CSD seals against water ingress and gas escape through cable duct and service entries into rail substation basements, cable vaults, switchrooms and access man-holes ; this includes protecting cable ducted 25kV trackside high voltage power cables feeding into lineside substations.

CSD duct seals are compatible with XLPE high voltage power cables 11kV, 25kV and 33kV multi-core and single core cables in trefoil.

CSD can seal vertical and horizontal cable ducts - the split insert sleeves grip to rail cables without sliding and falling out of the penetration.

Furthermore, CSD RISE can seal and protect DNO specification 11kV Triplex cables on both public and private networks.

CSD Actifoam Firestop provides fireproof ducting of rail cables powering emergency and essential building service systems - CSD can provide 2 hour fire protection (BS EN1366-3) providing high levels of fire safety performance.


Thorne & Derrick


Thorne & Derrick


Maintaining vital power supply and therefore revenue stream to the end client is not negotiable in the rail industry. Power outages caused by water ingress into substations can be prevented.

Thorne & Derrick Green Light for CSD on Metrolink
Manchester Metrolink is England's first modern street-operating light rail system. CSD RISE Duct seal system seals cable and pipe penetrations within the lift shafts, trackside communication and equipment, during the Mediacity:UK construction phase.

Thorne & Derrick The success of the RISE Duct system has led to further supply of CSD's products throughout the four network extensions.

CSD RISE Cable Duct Seal System is ATEX, WIMES, ESI, DSEAR, National Grid, Network Rail, MOD, Highways Agency (series 1500) and Lloyds Shipping accepted for utilities, oil, gas, petrochem, rail, construction, street lighting, power industry & hazardous area applications.

* Water - WIMES Specified CSD Cable Duct Seals for AMP Water & Waste Treatment Projects

* Electricity - Substation Cable Duct Sealing & Flood Protection for UK DNO's

* Gas - DSEAR Compliant Fire, Gas & Watertight Cable Duct Seals

* Telecoms - BT Openreach Broadband Cabinet Seals for FTTP Projects


Download the CSD RISE RAPID Duct Seal Leaflet


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CSD Video Lunch & Learn : CSD offers lunch & learn sessions, providing clients with specific 'knowledge share' workshops delivered at their own offices. The workshops give insight on the latest products, technology and installation information. Enquire

Cable Duct Seals : Reduce Risk. Stay Safe. Stick To The Spec.

When specifying, installing and purchasing cable duct seals the actual material cost should always be contexted with the potential real cost of a product failure, in terms of time, reputation and money. Under-specified cable duct sealing systems can lead to flood damaged substations and ultimately power black-out, leaving you and your client in deep-water.

Thorne & Derrick are national distributors and worldwide exporters of LV-HV Cable Installation, Cable Jointing & Electrical Equipment - we service UK and global businesses involved in cable installations, cable jointing, substation and electrical construction at LV, 11kV, 33kV and EHV. T&D service utilities, power, construction, rail, mining, offshore, oil, gas and petrochemical industries.

LinkedIn Please Join T&D Group: Linked In's fastest growing forum for the discussion of LV, HV & Hazardous Area Electrical matters; news, projects, videos, promotions, jobs, webinars, press plus much more. Invitation, RSVP.

This is an Open Invitation - simply select our Group and click Join.

Our members include Lead Electrical Engineers, Electrical Project Engineers, Principal Electrical Engineers, Plant Engineers, LV HV EHV Cable Jointers, ATEX Inspectors, Hazardous Area Professionals, Substation Commissioning Managers, LV HV EHV Project Managers, Buyers & Procurement Managers, SAP's and Sales Managers & Engineers.

Read Blog Newsletter Archive ATEX, IEC Ex, GOST Hazardous Area Eqpt  EX
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