A ground joint union has an angle cut (ground) into the union where the two sections mate. This provides more surface area at the joint, and allows the joint to seat more easily. This is in comparison to a flat faced union, which does not have an angle ground at the mating surface.
Besides, What’s the difference between a union and a coupling?
A coupling is a solid fitting with female threads on the inside of both ends. It is used for joining two lengths of pipe together that are not locked in place and can be turned. A union is used when you are trying to join two pipes together that are fixed, thus unable to be turned.
Keeping this in mind, What is a flange union? [′flanj ‚yün·yən] (engineering) A pair of flanges that are screwed to the ends of pipes and then bolted or welded together to hold two pipes together.
What is drip leg?
The rarely noticed sediment trap, or drip leg, is an important part of any gas appliance. These small pipes that appear to be extensions of the gas line serve the purpose of collecting sediment, debris, and other impurities that come through the gas line, catching them before they enter the appliance.
What is a pipe union used for?
Pipe unions connect two pipes together in a way that requires only one pipe to be turned when removing the union, facilitating repairs. Pipe unions also prevent galvanic corrosion when connecting pipes of dissimilar metals.
Can you use a union on gas pipe?
only unions allowed on gas are at the appliance. exposed or not, you can’t use them. gotta use left-right coupling and nipple.
What does a PVC union do?
PVC unions can be used in most instances where two pipes need to be connected. … PVC unions connect two pipes by threading together and do not require the traditional glued sealant coupling method to prevent leakage where the two pipes are joined together.
What is a flange union used for?
These flange unions are simple devices used for securely holding an orifice plate in a line, providing accurate and economical differential measurement with little or no maintenance. A slotted jackscrew separates flanges, simplifying removal and plate change.
What is the purpose of orifice flange union?
Orifice flange unions are flange assemblies with pairs of pressure taps machined directly into the orifice flange. These built-in pressure taps eliminate the need for separate orifice carriers or pressure taps into the pipe wall. OFUs replace standard pipe flanges when mounting orifice plates and flow nozzles.
What is an orifice union?
Orifice flange unions, commonly referred to as orifice unions, are simply a pair of orifice flanges used for holding an orifice plate in a line. Orifice plates are used for measuring the flow rate of fluids. … They hold the orifice plate securely in line, so that the plate can provide accuracy in measurement.
Is a drip leg necessary?
Drip legs are required to be installed in a manner that meets or exceeds fuel piping codes and manufacture requirements for appliances and devices. … It is a very simple and necessary component of fuel piping installation. The drip leg requirements are the same for both natural gas and propane.
How do drip legs work?
Drip Legs:
The properly sized drip leg acts as a separator by providing an increase in flow area, which slows the steam flow down allowing the condensate to drop out. This is important during operation as well as start-up. … On start-up cold piping causes steam to collapse and pressure to drop.
Does gas stove need drip leg?
Gas stoves or cook tops or fireplaces for instance are not required to have them. The purpose of a sediment trap is to prevent any sediment that may be in a gas supply line from entering into the controls of a heater or water heater.
Are gas unions legal?
Unions (inline couplings) are only permitted downstream (after) appliance shut-off valves, meter locations, and immediately downstream on building shut-off valves. The use of right/left couplings and nipples are required in all other locations. … Shut-off valves are required ahead of all gas appliances.
Do gas pipe unions need sealant?
Absolutely not. Those unions are designed to be ground joints and do not require sealant of any type. However I’ve seen many a do it to stop a leak, replacement is the correct repair.
Can you use compression fittings on gas pipe?
Compression fittings can be used on gas pipes, although this should be left to a professional who is CORGI registered. … Compression fittings are useful if you are working on a wet pipe as they will give a good seal where as a end feed or solder ring would not work.
How long will a PVC union last?
This entry was posted on January 9, 2020 by Korey Kashmer. As one of the most-used plumbing materials, PVC pipe is known for being very durable and long-lasting. In fact, PVC pipes last approximately 100 years.
What is a PVC solvent Union?
PrevNext. Unions are used anywhere in your plumbing system where a disconnect is required. These may be white or gray depending on our supplier. Item #: WW9074.
What is the use of union in a pipe line?
Pipe Union is a type of fitting equipment designed in such a way to unite two pipes which can be detached without causing any deformation to the pipes. Any kind of small diameter piping connections requiring a positive seal and easy assembly as well as disassembly are made with the help of pipe union.
What is flange taps in orifice?
Flange taps are used in this orifice installation, with the taps and pressure transmitter located above the pipe center-line to avoid picking up any liquid droplets that may pass through the pipe.
Why are regular orifice flanges installed in a pipe?
Orifice flanges are installed in a straight run of pipe in order to avoid turbulence at the plate. … When installing the orifice plate flange the pressure taps need to be at the same elevation to each other.
Why orifice is used in pipeline?
Orifice plates are most commonly used to measure flow rates in pipes, when the fluid is single-phase (rather than being a mixture of gases and liquids, or of liquids and solids) and well-mixed, the flow is continuous rather than pulsating, the fluid occupies the entire pipe (precluding silt or trapped gas), the flow …
What does an orifice do in hydraulics?
The orifice is one of the most versatile components that we can add in our hydraulic circuit. The orifice can be used to limit the amount of oil in one part of our system, to bleed a pressure line to tank, or to transform a nervous and aggressive circuit into an efficient and highly controlled one.
What is the purpose of restriction orifice?
A restriction orifice is used to limit a flow rate or to reduce a pressure in a pipe. It advantageously replaces a simple valve: simpler, more economical, more robust and maintenance free. This is a calibrated orifice placed in a pipe.