Technical Checklist - Underground Fittings

August 2004

NOTE: This checklist refers exclusively to fittings from our Underground range prefixed JG and UTS. Other fittings, valves, tube and ancillary products have their own Technical Specification.

Applications. Speedfit Underground fittings are designed to connect MDPE pipes (MRS-PE80) used above or below ground to convey potable water from distribution mains to individual properties.

Sizes 20mm and 25mm with adaptors for:-

- Copper to BS2871 Part 1 / BS EN1057. Table X and Table Y.
- Screwed pipe.
- LDPE (to BS1972 Class C and Class D) in 1/2" and 3/4" sizes.

Pipes Speedfit Underground Fittings can be used with:-

- Blue MDPE pipe to BS6572.
- Black MDPE pipe to BS6730.
- Pipes conforming to ISO161/1, ISO3607 and DIN16893.

Working temperatures and pressures. Maximum working pressure 12 Bar @ 20°C.


Standards Speedfit underground fittings are approved by the Water Regulations Advisory Scheme.

Performance. The fittings are manufactured from tough plastic material well able to meet the stringent requirements of the water industry. They have been approved by the WRAS and, as such, have passed the 'pull out test' where a force shown below is applied to a connection between MDPE pipes and a fitting for 5 minutes without the connection failing.

DO NOT USE FOR gas, fuel oil or compressed air applications or hot water.

Chemical effects. For below ground applications the fittings require no additional preparations - coating, etc. When used above ground, avoid contact with aggressive chemical compounds. Protect from frost where necessary. In the United Kingdom, potable water does not contain high levels of chemicals (e.g. chlorine, etc) that would aversely affect Speedfit Underground Fittings.

Exposure to sunlight. Permanent exposure to direct sunlight will necessitate lagging the fittings.

Pipe Inserts. Pipe Inserts must be used and fully inserted on all connections to MDPE and LDPE pipe.

System Testing. Pressure test to 1.5 times working pressure for 10 minutes before connecting to the mains supply. It is recommended that all pipe and fittings installations are pressure tested after installation before handing over to the final user.

Maximum Torque Figures. The maximum torque figures for BSP and BSPT threads used on Speedfit products are as follows:-

It is recommended that all installations are checked prior to use to determine that a seal has been made. The maximum torque figures quoted for use with Speedfit fittings are dependent on the mating thread conforming to the relevant British or International thread standards.

Back To Top

Linking to johnguest.com