VIP are recognised as the leading global manufacturers of Tyton-SIT® self restrained gaskets for ductile iron pipe and as a result, our Tyton-SIT® gaskets are selected as original equipment by many of the leading global producers. Each design has been thoroughly tested in accordance with EN545:2010/ EN598:2007 and our Tyton-SIT® fully comply with the requirements of BS6920 as well as holding WRAS material approval at temperature of up to 60º.
What is Tyton-SIT®?
- Designed to suit Tyton® socket (DIN28603)
- Self-restrained gasket used to joint ductile iron pipes to EN545/ EN598
- Used by all major pipe manufacturers globally since 1970’s
- Around 45% of pipe joints in Europe are self-restrained
VIP have been manufacturing Tyton-SIT® since the 1970’s and to date, have supplied over five million units worldwide.
These are self-anchored joints which eliminate the need for thrust blocks at changes in direction, making them particularly suitable for difficult or unsuitable ground conditions such as soft ground or subsidence-prone areas; where space is limited; steep inclines or under rivers.
Benefits of Tyton-SIT® Vs Concrete Thrust Blocks:
- Concrete thrust blocks are often impractical due to unstable ground (i.e. groundwater)
- Contractors/ Engineers use far more concrete than the design stipulates “just in case”
- Difficulty pouring in freezing conditions
- Environmentally unfriendly; the cement industry is responsible for 5% of worldwide man made carbon dioxide (CO2)
- Expensive to dispose of soil matter removed from trench
- Impractical and can cause disruption in city centre excavations
- In congested trenches, not always possible to pour thrust blocks without interfering with other utilities
|Traditional concrete thrust block||External Mechanical Restraint Joint|
Benefits of Tyton-SIT® Vs External Mechanical Restraint System
- External mechanical restraint systems cost considerably more
- More difficult to install as access needed to reach bolts beneath the joint
- Entire assembly needs to be protected from corrosion
- Larger trench needed compared with Tyton-SIT®
- Installation time of Tyton-SIT® typically 35% of the time taken to install External Mechanical Restraint
- Quicker installation
- Better for the environment
- Less disruption
- Lower installation costs
- No large excavation required
Table of Tyton-SIT® Maximum Working Pressures:
|Nominal Diameter (mm)||Operating Pressure Maximum Working Pressure||Maximum Test Pressure||Maximum Deflection Degree|
|DN100||30 bar||35 bar||3°|
|DN150||22 bar||27 bar||3°|
|DN200||22 bar||27 bar||3°|
|DN250||22 bar||27 bar||3°|
|DN300||20 bar||25 bar||3°|
|DN350||20 bar||25 bar||2°|
|DN400||16 bar||21 bar||2°|
As an alternative to Tyton®, VIP has also developed and patented Viptyte™. This is a seal for push-fit flexible joints in iron pipes. It:
BS6920. Suitability of non-metallic products for use in contact with water intended for human consumption with regard to their effect on the quality of the water.
ISO 3302-1:2014. Specifies classes of dimensional tolerances and their values for moulded, extruded, and calendared solid rubber products.
BS EN 681-1. Elastomeric seals. Material requirements for pipe joint seals in water and drainage applications.
ISO 2230:2002. Rubber products. Guidelines for storage.
BS EN 598:2007+A1:2009. Ductile iron pipes, fittings, accessories and their joints for sewerage applications. Requirements and test methods.
BS EN 545:2010. Ductile iron pipes, fittings, accessories and their joints for water pipelines. Requirements and test methods.