How to make hole on fire-fighting pipes? How to install mechanical tee and mechanical cross?

When laying fire-fighting pipes, mechanical tees and mechanical crosses are often required to connect branch pipes. During installation, you should make holes with hole cutting machine firstly, then install branch pipe. The operation steps are as follows:

Steps of using hole cutting machine:

1. Assemble suitable hole saw and matched center drill according to the demand.
2.Install the hole saw assembly to the chuck then lock it.
3.Put the machine on the pipe then fix it with chain.
4.Plug the power, turn on the switch,
5.If there is multi speed, choose the suitable rotating speed according to the pipe material.
6.Rotate the handle slowly, tap a location hole with center drill at first. Then make hole.
7.Add coolant to the saw during operation to extend its service life significantly.
8.Turn off switch, loosen the chain and remove the machine.
9.Remove iron filings around the hole, measure the hole size.
10.If there is burr in the holes, polish it with a grinder in time.