Hot tapping is the technique used to attach a branch connection to a pipe while the system is in service, and then creating an opening in that. Can be performed with out the need to shut down the plant. The primary equipment for a typical hot tap application includes a drilling machine, a branch fitting, and a valve. Cold tapping procedure catching the coupon hot tapping pipe is pressurized cold tapping pipe is not pressurized through the years we have helped customers with their hot and cold tapping applications. When the cut is complete, the cutter and pilot drill is retracted, the valve is closed and the hot tap machine is removed. Hot tapping the basics hot tapping is the ability to safely tie into a pressurized system while it is on stream and under pressure. Schematic of hot tapping procedure are also available that allow a hot tap to be performed by a single operator, without additional blocking or bracing. Pdf welding onto an inservice pipeline during hot tapping process are extremely risky and require thorough preparation and precautions. Hot tapping, or pressure tapping, is the method of making a connection to existing piping or pressure vessels without the interrupting or emptying of that section of pipe or vessel. A tapping machine is installed on the fitting, and the valve is opened. Hot tap fitting should be attached prior to the arrival of tdw services. Flowtite grp tapping procedures thompson pipe group. Hot tapping is the ability to safely tie into a pressurized system while it is on stream and under pressure.
Pipeline tapping is also the first procedure in line stopping, where the hole saw is used to make an opening in. Hot tapping and plugging technology opens pathway for safe, efficient projects. Pdf temperature prediction in hot tapping process for. Hot tapping and line stopping services require an indepth understanding of the flow rate, temperature pressure and nature of the material in the line. Hot tapping services 1296inch wet tap pressure taps on. Hot tapping equipment is described below and shown in exhibit 1. Welding of a flanged spool piece to a pipe or vessel that cannot be depressurised of gas or liquid or verified as sufficiently as gas or liquid free. The tapping adapter will contain the pressure of the pipe system, while the pipe is being cut, it houses the cutter, and cutter holder, and bolts to the valve.
Our hot tap procedures follow methodical steps due to the specialized nature of working on underpressure systems. Figure 1 the hole saw is advanced through the valve, to the pipe. The welding procedure qualification test shall include charpy impact test and hardness test and shall meet the requirements of clause 4. Manual pp750 december 2012 december 2012 supersedes. The procedure outlined in this technical publication is offered to assist in ensuring the quality of the polyethylene protection when making direct service connections. Hot tapping allows an opening to be cut or drilled into a pipe that is carrying product under pressure. Hottap equipment pressure tested prior to mobilization. This procedure is normally performed by a contractor who is experienced with. Industry standards every hot tapping engineer must know about. The hot tap procedure involves attaching a branch connection and valve on the outside of an operating pipeline, and then cutting out the pipeline wall within the. With over 35 years of experience, iss personnel have the expertise to tackle each unique application. Petersen128 series hot tap pipe plug system youtube. Temperature prediction in hot tapping process for high pressure pipeline technical report pdf available april 2017 with 4,055 reads how we measure reads. L l l hottap seal fails on penetration of pipe wall possible process fluid release environmental impact.
H l m remove hottap plug at regular intervals, clean the access fitting, removing build up of cuttings and inspectreplace primary seal. Advance cutterpilot assembly until it touches the parent pipe, then start the hot tap. Tonisco customers can attach new branches to existing pressurized pipeline networks without stopping the flow and processes connected to them. Hot tapping the material shown here has been extracted from the ebook 52 process safety moments and in the book plant design and operations. We stock all the necessary tools to tap, drill and catch the core of the pipe section you drill.
Hot tap operation the hot tap is made in one continuous process, the machine is started, and the cut continues, until the cutter passes through the pipe wall, resulting in the removal of. At any time during hot tapping operation pressure of fluid inside pipe shall not exceed 7000 kpa and hot tapping shall not carried out on sub atmospheric pressure. Introduction to the hot tapping procedure with video. Hot tapping or pressure tapping, is the method of making a connection to existing piping or pressure vessels without the interrupting or. Hot tapping hot tapping onsite engineering unique group. Ift hot tapping and line stopping pipeline procedure. The hot tap procedure involves attaching a branch connection and valve on the outside of an operating pipeline, and then cutting out the pipeline wall within the branch and. Hot tapping allows safe cutting into pressurised lines and vessels, flowing under reduced pressure and maintaining temperature.
This prevents costly and potentially dangerous environmental hazards while allowing for continued operation. Using hot taps for in service pipeline connections pdf epa. Tapping can be performed while system is pressurized. Hot tapping is an alternative procedure that makes a new pipeline connection while the pipeline remains in service, flowing natural gas under pressure. The hot tap cutter is advanced through the valve, to the pipe. A typical hot tap installation consists of a tapping saddle, gate valve, and hot tapping machine. Pipeline maintenance best practices lessons learned from the natural gas star program sga environmental round table. The procedure for hot tapping can also be used for cold tapping. Hot tapping procedure the procedure for performing a shutdown interconnect can differ for each set of circumstances and specific application, but essentially in a highpressure system the surrounding valves need to be closed in order to isolate the pipeline segment.
Standard valve used when tapping to install lateral lines. Pdf temperature prediction in hot tapping process for high. For the delicate operation that is hot tapping, extra care and attention is required as it is one of the most dangerous applications in pipeline intervention. The hot tap procedure involves attaching a branch connection by welding it using any welding technique on the inservice main pipeline. Hot tapping, also known as pressure tapping, is a method of connecting either by drilling or cutting to a pressurised system, such as a pipeline or pressure vessel, without removing the pipe or tank from service. Hot tapping is a process of cutting holes into pipe, tanks, or any pressurized vessel without interrupting system function and with no release or loss of product. Hot tapping is saddle fusion to a live or pressurized main. Cutting a hole through the wall of a pipe or vessel using a hottapping machine when the.
Im looking at three or four ways of doing it, probably one of the cleanest would be hottapping assuming i figure out a way to bring the operating pressure in the pipeline down during the actual tapping procedure. Advance cutterpilot assembly until it touches the parent pipe, then start. Safety manuals and procedural outlines are available from the american petroleum institute api, american society. This checklist is a necessary component of the hot tap plan required for any hot tapping and shall be attached to hot work certificate. Hot tapping makes it possible for pipeline owners and operators to isolate and bypass sections of pipeline so they can complete their projects without shutting down the system or losing product. Hot tapping is performed by qualified professionals who specialize in performing such work on a frequent basis. We help you eliminate shutdowns and draining the system. Care is to be used in retrieving the cut section or coupon by using a retention device on the pilot drill. Tapping tee fittings are usually installed on top of the pipe main, while branch or service saddle fittings are installed on the side of the main. Hot tapping site maintenance and shutdown specialists. When the hot tap is completed, the cookie or cut portion of the pipe, which. Hot tapping the technique of attaching a welded branch fitting to piping or equipment as it remains in service, and then creating an opening. Hot tapping can be used to add connections to a wide range of pipelines transmission pipelines distribution mains schematic of hot tapping machine. Welding a new nozzle on to a pipe or equipment item normally requires that.
The process is also used to drain off pressurized casing fluids and add test. Tdw recommends that hot tap fitting and tapping valve be pressure tested prior to tdws arrival. The process of adding nozzle or valve to a line or equipment without removing contained material on live line. Unlike most of the goofy asme code rules and nonmandatory appendices, the api rp 2201 recommended practice is a complete document that addresses this question. Hot tapping equipment is available for almost any pipeline size, pipe material, and pressure rating found in transmission and distribution systems. After welding the drilling machine is mounted to the connection threads of the valve. For the last 30 years, more and more direct taps have been performed on polyethylene encased iron pipe. Hot work on piping and other operating equipment is not done when. Using hot taps for in service pipeline connections contd exhibit 2. The hot tap permit, form a6004322, is prepared for each hot tap. Hot tap plugging system for pressurized pipelines pipe plugs. No need for loss of production or supply to other areas additional branches allowing supply to and from other areas of plant etc. Ift hot tapping services include tapping 12 to 102 on natural gas, water, sewage, steam, petroleum products, and chemicals.
After the tapping fitting has been joined to the existing pipe, the tapping valve is bolted to the outlet of the. Hot tapping is a method of making a connection into an existing pipe or vessel which is still under pressure or live. Whether hot tapping a pressurized pipe system, storage tank, pipe elbow, blind flange or containment wall you can count on our experience to see your project is completed safely, efficiently, and on time. This means that a pipe or tank can continue to be in operation whilst maintenance or modifications are being done to it. This makes it a reliable, costeffective solution to water, sewer. After a successful seal is confirmed the tapping cutter will be advanced forward and the pipe hot tapped. The hot tapping machine consists of a telescopic boring bar, mechanically driven, advancing a cutting tool the full bore valve acting as a control valve allows the drilling machine to be removed connection to existing pipe is made through a full encirclement split tee welded or mechanical which contains system pressure and provides a. The influence of natural gas velocity on hot tapping process ijeat. Tonisco hot tapping principle using nonweldable bolted hot tapping saddles and flanged valves tonisco hot tapping principle using weldable tonisco sluice and ball valves 1 2. Other materials cast iron mondi pipe, aluminum, copper, etc. We specialize in small to large pipeline specialty services including hot tapping, wet tapping, line stopping, pipe freezing, valve insertion, welding, leak repair and more. Nationwide hot tapping is able to undertake the whole process, i. Hot tapping, line stopping and pipe freezing industrial. The tightness of the whole drilling assembly is controlled by a pressure test.
After the fusion areahas cooled, the main pipe wall is pierced tapped to enable flow through the branch. The checklist should be progressively completed during the planning and execution stages of the hot tap. A typical hot tap installation consists of a tapping saddle, ball or gate valve, and hot tapping machine. If playback doesnt begin shortly, try restarting your. Tee hot tapping material s0402040 page 6 of 7 hoop stress equivalent to 95% of the specified minimum yield strength and for the pipe with which the split tee is to be attached without impairing its serviceability. Hot tapping is an activity that is commonly contracted to experienced contractors who have thier own approved welding proceedures. Introduction to hot tapping in piping the process piping. Coupon and cutter are withdrawn with the coupon or cut out retained by the uwires. Hot tapping or pressure tapping is the method of making a connection, or tying into, existing pipe or vessels without interrupting the system. Industry standards every hot tapping engineer must know about meeting or surpassing industry standards on your pipeline projects is something that all engineers should strive towards. The installation is pressure tested, the valve is opened and the cutter and pilot drill advanced. Mount the hot tapping machine to the piping system.
The division that does the hot tap should maintain the completed checklist on file with the hot tap plan. This allows the plug launching system to also bypass flow upstream of the plug. Hot tapping and line stopping fittings, equipment and. A hole is cut into a pipeline or vessel to allow for new pipeline tieins to be installed. What is a hot tap, why it is made and how to make a hot. This will allow customer to repair or replace a faulty valve or repair welding on fitting.
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