Joining and Installation of Threaded Pipe and Flanged Fittings Flashcards
What are the 2 common class ratings for steel flanged fittings?
150 and 300 LBS
What is the maximum allowable pressure for the 2 common steel flange class ratings (150,300)?
285 and 740 PSI
What class are cast iron fitting?
125 LBS
What are the four types of flanged fitting connections ?
- Welded
- Screwed / Threaded
- Socket Welded
- Lap Joint
What are the 2 main purposes that gaskets serve?
- Sealing for leak prevention
- Isolation of 2 sections of pipes being joined
Gasket sizes are determined by the inside or outside diameter of the flanged fitting?
Inside
What are the ratings for full face gaskets ?
- 125 - 150 LBS
- 300 LBS
- 600 LBS
To select the proper full face ring gasket, determine the _________ size and the gas ________. Then refer to Eversource Material standards for flanged fittings
Flange / Pipeline
Should bolts have fine or coarse threads?
Coarse
How many threads must extend beyond the nut when tightening?
One Full thread
A bolt’s _______ must be in accordance with company standards.
Grade of steel
Bolts are tightened in what pattern?
Star pattern
Bolts are tightened with a calibrated torque wrench using what method?
In thirds 1/3
ei. 100lbs
- 33 , 66 , 99 LBS , then one full clockwise rotation
What bolts are used to hold the gasket in place ?
The 2 bottom bolts / diametrically opposed
What are some AOC’S
- Escaping or blowing gas
- Wall thickness irregularity
- Unexpected pipe type, size, or pressure
- Pipeline damage
Painting the pipe and other fittings prevents what ?
Corrosion
Flanged fittings are found in both _____ and _______ installations.
Above / Below Ground
Stress produced in a pipe wall by pressure of gas in a pipe is called what ?
Hoop Stress
Always select the correct size pipe and fitting from the ______ .
Schedule
The disadvantages of flange joints is that the configuration is difficult to protect from what ?
Corrosion
Cast iron fitting with a normal class of 125lbs normally have a ______ face.
Flat
Fittings manufactured of other class ratings not of cast iron, normally have a ______ face.
Raised
In some cases what type of flanges are used on meter sets?
Threaded / screwed flanges
What type of flanges are used when they must be smaller than 2”?
Socket welded
What type of flanges are exclusively used on meter sets?
Lap joint
Flanged fittings difficult to separate may require the use a flange __________ to pry them apart.
Separator
Black pipe is also referred to as what?
- Black steel pipe
- Wrought iron pipe
Only join pipe of the same ______ and ______.
Schedule and Grade
A ______ provides a 90 Deg bend with 2 female openings.
Elbow
A _______ has 2 male threaded ends, and is used between fittings that are closely spaced.
Nipple
A ________ , sometimes referred to as service or street ells, consist of one female opening and one male thread.
Street Ell
A ___________ provides a branch connection, consisting of 3 female openings all the same size.
Standard Tee
A __________ provides a branch connection, consisting of 3 female openings, 2 of the same size, 1 on smaller diameter.
Reducing Tee
A _________ provides a branch connection, consisting of 2 female openings and 1 male thread.
Street Tee
A _________ of a tee consists of connecting one end opening of the tee to a fitting or a piece of pipe.
Running Connection
A ________ of a tee means connecting a fitting or a piece of pipe in the side opening of the tee.
Bullhead Connection
________ consist of 2 female openings, they are used to connect two male threads, they also come in reducing type, being able to connect 2 male threads of different sizes.
Coupling
______ are used to close a tap in a fitting, it is recommended when possible to instead use a cap and a nipple due to their heads being able to break.
Plug
_______ are used to reduce the size of an opening.
Bushings
______ allows for a quick connection and disconnection of a pipeline.
Unions
______ are used for repairs in the middle of long piping systems.
Unions
The _______ of the fitting is where the pipe is inserted into the fitting.
Face
The ______ is the part of the fitting in which the pipe is inserted into the fitting and tightened to appoint in which it is leak proof. Can also be known as the make-up.
Engagement
The ________ is the distance from the end of the pipe to the center of the opening of the fitting.
Fitting allowance
A standard thread is _______ shaped with an angle of ______ degrees.
V-shaped / 60
The first 7 threads are ____________, sharp at the top and bottom.
Perfect Threads
After the perfect threads, the next 2-3 are _______
Perfect at the bottom but not the top
The remaining threads are called _______, they have no sealing value.
Starting threads
What PPE is required during pipe work?
Gloves
The distance a standard male thread will screw into the female thread is called what? Also known as the engagement.
Make-up
90 Degree Elbow
Nipple
Street Elbow
Standard T
Reducing T
Street T
Insulating Union
Standard Union
