Presentation on theme: "Cutting and Threading Steel Pipe"— Presentation transcript:
1Cutting and Threading Steel Pipe HVAC523Cutting and Threading Steel Pipe
2Pipe threader types Manual threading machine Electric threading machine
3Personal SafetyStay Alert, watch what you are doing and use common sense when operating a threading machine.Dress properly, no loose clothing.Avoid accidental starting. Be sure the switch is off before plugging in.
4Personal SafetyDo not over-reach. Keep proper footing and balance at all times.Use safety equipment. ALWAYS wear eye protection.Operate machines from the side with the switch.
5Specific SafetyAlways consult the tool manufacturers operating manual for specific safety information.Injuries from threading machines can be:Loss of fingers.Electric ShockBroken bonesEye injuries
7Electric threading machine safety These machines are made to cut and thread pipe.Always secure machine to a bench or standSupport long heavy pipe with pipe supportsDo not wear loose clothing or loose gloves.
8Threading machine safety Do not reach across the machineDo not use machine if foot switch is broken.Tighten chuck hand wheel and engage rear centering device on the pipe before turning on the machine.
9Threading machine safety Lock foot switch when not in use.The foot switch is for your safety. It lets you control the motor with your foot. If clothing should get caught in machine it will continue to pull you in.Because the machine has a high torque the clothing itself can bind around your arm with enough force to break it.
10The foot safety switch allow for hands free operation of the threader
11Tools required A holding device Chain ViseYoke ViseMotorized pipe viseThe chain and yoke vise are for hand cutting and threading only.
12TripodThe pipe vise (also known as a TRIPOD) is used to hold the pipe in place.
16Tools required Pipe Threader Also known as a die. Most threaders used in the field are fixed die threadersCan be used to clean up existing threads.
17OilerUsed to supply cutting oil to lubricate the pipe as threads are being cut.The oil cools the die which extends the tools life.The oil cools the pipe which prevents jagged and malformed threads.Usually comes with an attached tub to catch shavings and also recycle the oil
18Pipe StandUsed to support long pipe lengths extending out from the vise.Do be careful when using the pipe stand. They can topple over easily if not careful.Best way to prevent this? Foot it!
19Pipe WrenchesCan be used to attach the fittings to the pipe while in the vise.Used to assemble piping systems after threading.Always use a matched pair!
20This burr must be removed after cutting. Ream the pipe!
22Threading pipe using a manual threading machine After you have cut the piece of pipe you want to thread, reamed the pipe to remove any burrs from the inside, then follow the next procedures carefully.
23Step 1 Set the section of black pipe into the pipe vise. The end of the pipe to be threaded should extend 8” – 12” inches past the end of the pipe vise.
24Step 2 Pull the chain of the pipe vise over the pipe. Insert the chain into the pipe vise clasp and turn the vise handle to tighten the chain.Stop tightening when the pipe is held securely.
26Step 3Select a die from the die set that matches the diameter of the black pipe and inspect the cutting threads of the die for broken or worn teeth.If the die is damaged, do not use it to thread the black pipe.A die that is damaged or dull will not produce usable threads.
27Step 4Insert the inspected die into the socket of the pipe threading ratchet.
28Step 5Liberally coat the inside of the die with cutting and tapping fluid.Hand held Oiler
29Step 6Align the die with the end of the black pipe and turn the threading ratchet clockwise (as if looking at the end of the pipe) to thread the die onto the end of the black pipe.Stop turning the ratchet after you have made one complete revolution with the ratchet.
30Step 7Turn the ratchet in the opposite direction ½ of a turn to remove metal shavings from the cutting threads of the die.
31Step 8Apply cutting and tapping fluid to the surface of the black pipe and the die.Continue turning the ratchet to thread the black pipe.
32Step 9Remove the die from the threaded black pipe by turning the ratchet in the reverse direction until the die comes off the end of the black pipe.
33Step 10Wipe the threads with a clean rag to remove any metal shavings from the end of the pipe.
34Step 11Release the threaded black pipe from the vise by turning the pipe vise to loosen the chain.
35Step 12Clean the top of the pipe vise with a rag to ready the vise for the next piece of pipe.