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, Can you put a union on a gas line?
only unions allowed on gas are at the appliance. exposed or not, you can’t use them. gotta use left-right coupling and nipple.
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.
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.
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.
How does a slip on flange work?
Slip on Flange is essentially a ring that is placed over the pipe end, with the flange face extending from the end of the pipe by enough distance to apply a weld bead on the inside diameter. … Slip on flanges have a lower material cost than weld neck flange and are more easily aligned.
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.
Can you reuse black pipe union?
Black iron pipe lasts almost forever. Perfectly acceptable to reuse it. I never throw any threaded pipes, nipples or fittings away. Use a wire brush to clean all the old dope out of the threads and apply new.
Is Csst legal in California?
– In a turnabout that has gratified proponents of corrugated stainless steel tubing and flexible copper gas tubing, the California Department of Housing and Community Development has voted to accept the materials in the California building code. …
Should I use Teflon tape on unions?
Don’t use Teflon tape, Teflon paste or pipe dope. … Teflon paste and pipe dope, just like Teflon tape, make threaded joints slippery. Their use on PVC fittings can be an invitation to over-torque. When working with threaded plastic fittings do use a proper sealant.
How do you seal a leaking union?
If the union is leaking from either solder joint, disconnect the union and heat the leaking joint to melt the solder. Slip the union off, spread new flux and re-solder it. If the union is joining copper and galvanized steel pipes, it should be a dielectric 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.
How does a plumbing union work?
A union is used when you are trying to join two pipes together that are fixed, thus unable to be turned. A union is very similar to a coupling, except that it can be unscrewed into two separate pieces and then screwed back together when both separate ends are attached to the two pipe ends that need to be joined.
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.
Where do you use a slip on flange?
The slip-on flange can work well after attaching to the end of a pipe or pipe fitting. The product is fit in easily, or the end of the pipe is set back easily by the thickness of the pipe wall plus 1/8 of an inch. It allows easy installation without putting effort and damaging to the flange face.
What is the difference between lap joint flange and slip on flange?
lap joint flanges are very similar to a slip-on flange, with the main difference being that it has a curved radius at the bore and face to house a lap joint stub-end. Lap joint flanges and stub-end assemblies are typically used in situations where frequent dismantling is required for for inspection.