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It is safe to say that pipe connections are an essential part of pipelines all around the world. They ensure that whatever substance is travelling through the pipe has a continuous smooth flow.
Pipe connections have many uses; Among other things they help pipelines to be many miles long, help to change the direction of the flow, allow for maintenance to be carried out and for valves to be changed.
Here at SPM we source and supply a wide variety of different pipe connections such as threaded connectors, nuts & bolts and hub clamp connectors. These come in a range of exotic materials such as stainless steel, duplex, super duplex, nickel alloy and 6% alloy. The pipe connection used in a pipeline is often made of the same material as the pipes it is connecting.
The pipe connections we are discussing in this blog (threaded connectors, nuts & bolts and hub clamp connectors) can be used on a permanent basis but are more often used as semi-permanent connections.
For information on a permanent connection used in pipelines, please refer to our blog on buttweld fittings and bevelled ends.
Threaded – or screwed – connectors are used regularly to connect pipes when water, steam and other various fluids and gases need to be transferred from one place to another. A risk with threaded connectors is if they are over-tightened which means then they can be damaged and thus be very difficult to separate.
The most common threaded connections are BSP & NPT:
Flange connections are very important in the petroleum and chemical industries, and bolts and nuts are an essential part of them.
The most common flange connections are:
The most popular type of flange connections that SPM stocks are as follows:
In order to clamp two flanges to together, nuts and bolts are vital. The quantity required will be determined by the number of bolt holes in a flange, while the diameter and length of bolts is dependent of flange type and Pressure Class of flange.
In the petro and chemical industries Stud Bolts and Hex Bolts are most frequently used for flange connections. The Stud Bolt features a threaded rod with two robust hexagon nuts, while the Hex Bolt has a head with just one nut.
Hub clamp connectors
Hub clamp connectors are lighter, smaller, faster to make and break, and easier to maintain than conventional flanges. Stringent engineering processes and quality standards can result in unparalleled reliability meaning they have a wide range of benefits and applications. Two of the most reputable manufacturers of hub clamp connectors are Techlok® and Grayloc®.
A hub clamp connector is typically assembled with 4 bolts compared to the 24 bolts on a conventional flange. The design of a hub clamp connector results in a very well-sealed pipe, where often the connector can surpass the strength of the pipe and other components that may also be connected. Their design means that the hubs around the pipe edges are pulled together by clamps and are forced against the seal ring rib. The clamp takes the pressure of the pipes and carries the load. These connectors have the capability to survive extreme environments situations even without routine maintenance.
Clamp connectors are used for the following applications:
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