MUELLER ® LINE STOPPER UNIT NO. 2, 3, 3SW, 3SW-500 AND 4SW Typical Stopping Machines 10.13 Shaded area indicates change Rev. 6-10 No. 2 No. 3 No. 3SW No. 3SW-500 No. 4SW The Mueller Line Stopper Unit Numbers 2, 3, 3SW, 3SW-500 , and 4SW stopping and completion machines are an assembly of tools and methods that provide a means to install and stop-off 3" to 12" line stopper fittings having flanged completion caps. This equipment is not sold as a unit. Due to the variations in tools required for the different sizes, pressure classes, and styles of fittings, machines and tools are purchased individually. Each line stopper fitting is illustrated with an accompanying list of equipment that is used to install and stop it off. These line stopper units can be used with Mueller split (two sided) weld type or mechanical joint type line stopper fittings, flanged tees and Save-A-Valve ® Drilling Nipples. The combination of stopping and completion machines, tools, fittings and methods result in the MUELLER NO-BLO ® System of line stopping. This system, through decades of successful application and reliable operation, has proven to be the system of choice by most gas utilities. Line stopping units are often used for replacing or repairing a section of pipe line without interrupting service to customers. This is done by using two line stopper fittings to isolate the section of pipe and running a bypass line around the isolated section. These stopping machines have an integral bypass connection that allows the bypass line to be connected between the two machines. Specially designed rubber stoppers are used to stop-off the line to isolate the section of pipe that is to be replaced or repaired, while permitting flow to be channeled through the bypass line to continue uninterrupted service to customers. Three styles of fittings and equipment are available--- regular bypass (bypass line between machines), side out bypass (side bypass constructed between fittings), and bottom out bypass (bottom bypass constructed between fittings). The bottom out bypass is generally used when a pipeline grade change is required. Since many stop-offs are made under emergency conditions, this equipment should be considered emergency equipment and maintained in good condition. Crews should be trained on the proper use of the equipment and an adequate stock of machines, tools and fittings should be maintained.
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