Steps for Installing Industrial Galvanized Steel Pipes

1. Pipe Cutting: Based on the site survey sketch, draw lines on the selected pipe and cut the pipe along these lines.
A. When cutting the pipe with an abrasive saw, place the pipe in the abrasive saw clamp, align it with the drawn line, and clamp it securely. Apply even pressure to the handle when cutting; do not apply excessive force. After cutting, thoroughly remove any burrs or metal enamel from the pipe end.
B. When cutting the pipe with a hand saw, fix the pipe in the pressure clamp of the saw, align the saw blade with the drawn line, and push the saw with both hands. Keep the saw blade perpendicular to the pipe's axis. Apply even pressure while pushing and pulling the saw, and cut all the way through. Do not twist or break the pipe to prevent deformation of the pipe end.

2. Threading: Thread the cut galvanized steel pipe in stages according to its diameter. Generally, pipes with a diameter of 15-32mm require 2 threads, 40-50mm require 3 threads, and pipes with a diameter of 70mm or more require 3-4 threads.
A. Using a threading machine: Clamp the galvanized steel pipe onto the threading machine chuck, leaving an appropriate length. Tighten the chuck, align the die with the die number, and align the scale to the appropriate position according to the pipe diameter. Tighten the trigger, align the lubricant tube with the thread end, start the machine, and push the plate. Once the thread is threaded to the appropriate length, gently release the trigger.
B. Threading with a threading die: First, loosen the locking trigger, retract the threading die to zero degrees, install the dies according to the sequence number, align the die with the required mark, tighten the locking trigger, place the galvanized steel pipe in the pressure clamp of the pressure plate, leaving an appropriate length for clamping, and gently thread the threading die onto the galvanized steel pipe, ensuring a moderate tightness. Then, push the threading die with both hands, threading 2-3 turns. Next, stand to the side and apply even force to the threading die. When the thread is almost complete, gently release the trigger, turn on the machine to retract the die, ensuring the thread has a taper.

3. Fitting: According to the site survey sketch, install the fittings onto the threaded galvanized steel pipe.
A. When fitting pipe fittings, insert the required fittings into the pipe threads and test the tightness (generally, inserting 3 turns by hand is recommended). Apply lead oil and wrap hemp around the threads before inserting the fittings. Then, use pipe wrenches to tighten the steel pipe fittings, exposing 2-3 threads. Remove the hemp ends, wipe off the lead oil, number the fittings, and place them in the appropriate position for straightening.
B. Select the appropriate pipe wrench according to the diameter of the pipe fittings being fitted.

4. Pipe Section Straightening: Straighten the galvanized steel pipe sections with fittings already installed before installation.
A. Apply lead oil to the threads of the galvanized steel pipe sections with fittings installed. Connect two or more sections. When connecting, do not only consider the direction of the reserved opening, but also take into account the curvature of the galvanized steel pipe. After aligning them, turn the reserved opening to the appropriate position and maintain its upright position.
B. After connecting the galvanized steel pipe sections, before straightening, it is necessary to check the pipe diameter, reserved opening direction, and diameter change points against the design drawings to ensure they are correct. 
C. Straightening galvanized steel pipe sections should be done on a pipe-straightening rack or platform. Two people are generally recommended: one visually inspects the end of the pipe section, while the other uses a hammer to tap the bends, observing as they are tapped, until the galvanized steel pipe section is straight and without bends. Mark the connection points of the two galvanized steel pipe sections. Remove one or more sections, then add one or more sections until the straightening is complete.
D. For pipe sections with excessively sharp bends at connection points or pipes with large diameters, the pipe can be heated in an oven or by gas welding to 600-800℃ (red-hot). Place the pipe on a steel pipe rack and continuously roll it, using its own weight to straighten it. Alternatively, use a wooden board to support the heated area and gently tap it with a hammer. After straightening, continue rolling until it cools. When the temperature is just right, apply machine oil to the heated area. All threads straightened by heat must be marked. Remove the pipe, reapply lead oil, and wrap it with hemp, then align the pipe section with the marked threads and tighten.
E. When straightening galvanized steel pipe sections with valves already installed, the valve cover should be removed first, and the valve area should be properly shimmed before striking to prevent the valve body from cracking.
F. Galvanized carbon steel pipes must not be straightened using heating methods.
G. Galvanized steel pipe sections must not be damaged during straightening.