Underground Supplies & Services Private Limited

The Harben DTB 500 is a worthy replacement for the hugely popular DTB trailer mounted jetting unit. It has an all new chassis which has been strengthened and stiffened to take the 500 litre (110 gallon) rotationally moulded water tanks. These tanks don’t rust, crack or split and they offer huge weight savings over less advanced metal versions. Power to drive the Harben P type pump comes from the latest Yanmar emission compliant engine, one of the quietest available, capable of delivering 275 Bar (4,000psi) at 59 L/min (13gpm) – ideal for the toughest drain cleaning jobs. Operators will love the huge workrate available as a result of the increased water tank size. Tests have shown that up to 50% more meterage can be cleaned compared to similar machines with smaller water tanks, leading to increased efficiency and higher profits.

The Viking Johnson Dismantling Joint is a double flanged fitting that allows longitudinal adjustment in flanged pipe systems. It has been developed to provide greater flexibility at both the planning and installation stages of flanged pipework systems and for subsequent maintenance

• Wide tolerance iron body clamps 
• Repairs as strong as pipe
• 16 bar working pressure
• Install underpressure
• Universal underpressure tees
• Spigot and socket repair system
• DN50/2”- DN 600/24”

• Self anchoring couplings and flange adaptors.
• DN50/2”- DN250/10”
• Ductile iron and stell pipes.

• Stainless Stell repair clamps.
• Full range, outlets, flanged etc.
• Fully stainless construction.
• DN50/2” – DN600/24”

• Universal Coupling range
• Coupling/flange adaptors/stepped coupling
• DN40/1.5”- DN600/24”
• 16 bar working pressure
• True repair product

USS provides Stepped Couplings which are used to connect pipes of different outside diameters and/or pipes of different materials.

To accommodate the variety of sizes and combinations required, the centre sleeve of stepped couplings will be one of the three basic designs:

A.Expanded Sleeve

For the standard stepped connections (same nominal size, different materials), an expanded one-part sleeve, made as a casting or of rolled steel, is normally supplied.


 B. Fabricated Sleeve

For non-standard connections, where the difference in pipe diameters is not excessive, a two-part welded sleeve is fabricated from rolled steel

C. Make-Up Ring Sleeve

Where large steps between pipe sizes are required, a three-part welded sleeve is fabricated with studs fitted to the centre plate of the coupling instead of bolts. 

NOTE

For non-standard couplings the customer is encouraged to ask for an overall dimension drawing of the stepped coupling offered.

NOTE

Viking Johnson Flexible couplings do not resist longitudinal thrust loadings, and pipe pull-out will occur unless the loads are restrained by other means. 

Pressure Rating

Pressure ratings for stepped couplings are equivalent to either:
the rating specified in the straight coupling schedules for the larger of the two pipe sizes involved, or the lower of the individual pressure rating of the two.

 Coupling Movement

When stepped or wide range couplings are used to join pipes of different outside diameters, it is essential to ensure that the stepped coupling cannot be forced along the smaller diameter pipe by internal pressure forces. This does not normally apply to the standard range of stepped couplings using expanded sleeves in a below ground service at moderate pressures. This is particularly important above ground and/or where a stepped coupling is used as an expansion joint. Regular inspection of the coupling position against a previously applied mark is strongly recommended, especially in ground installation.