How it’s made - PVF Bleed Rings

Bleed rings provide easy access to drain piping, taking samples, or attaching instruments to pipe lines. bleed rings are a ring section with one or more radial pipe connections designed to fit between standard flanges with the bolt circle. Standard bleed rings are manufactured with at least one 1/2-inch or 3/4-inch tapping to allow easy connection of valves and instruments. Bleed rings are easier to install and more affordable than orifice flanges particularly in brownfield operations where hazardous materials or contamination are concerns. They can also reduce or dispose of pressure before removing a flange. This procedure is common when replacing leaky valves in a piping system. A piece of sheet metal is used to start the process. So workers use a forklift, crane with a magnet and a crowbar to get it into place. This plate of metal is one and a half inches thick. Using an A-516 Grade 7 steel to meet API specifications. The table on the water jet where the specialist will make sure everything is lined up perfectly for the water jet. After the dimensions have been double checked the Cad worker sends the information to the Power jet control center. after following safety set up precautions starts the process with e push of a button The immediate blast hits the steel with 90 thousand PSI of pressure. Until the stream works its way through the steel it will have a huge plume of what at first glance looks like smoke. But this is just the mist from the intense pressure of the water bouncing off the steel at such a high velocity. After the cut makes its way through the steel it can start the process of making the circular cut. The jet is spraying a mix of water and sand to help make the cut. Because of the thickness of the metal sheet the actual time for it to go all around the inside diameter of this 6-inch Bleed ring, takes almost 30 minutes. As we time lapse it we can see the trail and precision of the machine. The dimension between the inside and outside of the 6” bleed ring is eight and five-eighth inches, with the inside diameter set perfectly to fit on a 6” pipe. As you can see the cuts are made as close to the edges and other rings to ensure that they get the maximum number of products from each sheet of metal. Because there is a small amount of sand to help the cut, it does leave a little bit of residue that is not beneficial for the plate of steel, because of this the machinist frequently uses a power washer to clean the metal making sure to keep it from getting damaged. When the bleed rings have been cut out the machinist uses a large magnet with a handle to get them to easily be removed from the plate. With the rings cut , its now time for the hole to be drilled. As a new machinist prepares the drill, he first checks his stats and prepares the drill with a bit that will match the spec. in this case it will be a ½” hole. After set up is complete, the drilling starts. The ½” immediately starts to work its way through the steel,. To ensure that the metal ring or the drill bit overheat, cutting oil is leaked onto the spot of the drilling keeping the temperatures cool and not deforming or altering the drilling process. Pieces of shard or metal bits from the ring fall safely to the floor. Since the hole needs to have a female thread the machinist prepares a device that will thread the hole the was just drilled out. This is called taping the hole. However, before he starts the taping of the hole he double checks the size to make sure his measurements are correct. Measure twice cut once is a wise idea when you’re a machinist working with expensive time consuming to replicate material. After the measurements, and the ring is clamped in secure the taping begins. Although some taping is done my machines, he prefers to use a hand held tap for sizes ½ inch #13 applications, so he can slowly take his time and get a nice perfect thread. Like the drilling process the machinist uses a gutting oil that helps the delicate nature of the taping, and ensues the Tap doesn’t get stuck. The Hand held Tap tool can be moved back and forth but the ultimate spin will be clockwise to make the thread. When complete the hand held tap tool is spun out counterclockwise and cleaned with a brush for an additional tapping to make sure no metal pieces are left inside the threads. The bleed ring is now taken outside to be spray painted black. This helps with rust and making a clean looking finished product the machinist is able to start the process of stamping the item. The stamp gives details from when the item was made, the type of material that was used, and the country of origin. the bleed ring has a tracking number used for MTR’s or material test requirements. The finished product is then taken to a master distributor where they are put in stock while waiting to be pulled for the need from a local supplier

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