What is a reinforcing pad?
Repads are also known as reinforcing pads. These are doughnut-shaped supports that wrap around the base of your branch joint. Essentially, when you weld a perpendicular branch, sometimes called a stub-in, onto your main pipe, repads add a layer of strength.
How are reinforcement pad dimensions calculated?
Dimensions Reinforcing Pad
- Material = same material as the run pipe.
- Width = half a diameter of the branch pipe (at least 50 mm)
- Thickness = same thickness as the run pipe, with a min. of 3 mm and a max. of 20 mm.
Why are there holes in reinforcement pads?
The vent hole serves a couple of purposes. 1) it relieves any gas pressure that may develop when welding the pad to the nozzle or branch. 2) it is threaded so that it can be pressure tested to check for leaks. 3) it serves as a “telltale” if the weld underlying it develops a leak.
Why reinforcement is provided in nozzle?
A reinforcing pad on the nozzle is provided when the area “lost” due to cutting the opening is more than the area “available” in the header portion and the nozzle portion (above the header and inside the header).
How is reinforcement pad weight calculated?
How to find if an RF pad is required?
- A1 = Area of pipe removed from the header or run pipe.
- A2 = Extra thickness available in the header pipe. i.e. thickness considered for factors of safety.
- A3 = Extra thickness available in the branch pipe.
- A4 = Area of RF Pad & area of welding.
What is reinforcement pad for nozzle?
RePADs or RF Pads are plates used to reinforce components and/or nozzles by increasing thickness local to the component in high stressed zones. These are made from the same size and material as the pipe header to which they are welded.
What is the volume of concrete pad?
For concrete, the formula for volume is as follows: length x width x thickness. To determine how many bags of concrete you will need, divide the total cubic yards needed by the yield. Use the following yields per each bag size: 40 pound bag yields .011 cubic yards.
The reinforcing pad is a ring cut from a steel plate that has a hole in the center equal to the outside diameter of the branch connection. It is slipped onto the branch pipe before the branch pipe is welded to the header. Once the branch has been welded to the header, the reinforcing pad is slid down the branch to cover the weld connection.
What is a Full encirclement reinforcing saddle?
Full encirclement reinforcing saddles are designed to completely encircle the run and branch pipe. They come in either two or three pieces that are installed around the run and branch. Full encirclement saddles are installed by welding the pieces together along the split lines and then filet welding the branch of the saddle to the branch pipe.
Can a reinforcement pad be made in more than one piece?
If the reinforcement pad is made of multiple pipe cuts, then a vent hole should be provided in each cut piece. A pad or saddle may be made in more than one piece if joints between pieces have strength equivalent to pad or saddle parent metal, and if each piece has a vent hole.
What is the maximum thickness of a reinforcing pad?
Sometimes, Reinforcing pads are provided in-between shoe or saddle support and parent pipe when parent pipe thickness is less than required. Normally Maximum thickness that is used in engineering companies as reinforcing pad thickness is 1.5 times parent pipe thickness.