Measuring, Cutting and Joining Pipes

Measuring, Cutting and Joining Pipes

Group 23-1 Cast Iron PipeTYPES:SV type used for building installationsXH type extra duty pipeCast Iron PipeFour VarietiesStandard pipe well-fitted hub spigot connectionsSingle hub pipe - when length of pipe needed is more than 150 cmDouble hub pipe - when a piece of pipe needed is shorter than 150cmHubless pipe - used in lieu of the single hub

Table 3-1 Weight of Soil Pipe 150cm Long

SizeSingle hubDouble hubmminkgkg50212.5013.075321.6022.0100429.5030.0125538.5039.0150645.5046.0Pipe sizeLaying length (cm)mminPipe with HubHubless pipe502143150753143150100414215012551421501506142150Table 3-2 Effective Length of Cast Iron Pipe3-2 Measuring Length of Cast Iron PipeMeasurement of pipe required for installation includes the amount of pipe engagement and dimension of the fitting.Different sizes of pipes require different amounts of engagement. Table 3-3 Additional Length in Cutting Cast Iron Pipe Pipe DiameterEngagement Lengthmminmmcm502626.2753686.81004757.51255757.51506757.5ExampleSFind the length of the cast iron pipe required to connect the installation, and determine what type of should be recommended.

ExampleS2. Find the number and length of the cast iron pipe required using 100 mm (4) diameter.

EXAMPLES3. The installation shown specify the use of 75 mm diameter hubless pipe. Find the number of pipes required.

3-3 Cutting and Connecting Pipes3 Different Methods in Cutting Cast Iron Pipes HacksawUse chalk to mark your cut linesCut through the marked linesCold ChiselUse chalk to mark your cut linesUsing the cold chisel, start making small marks.Create a smoother cut.

3. Snap CutterUse chalk to mark your cut linesWrap the chain of the snap cutter around the pipe as evenly as possibleApply pressure onto the handles of the cutter so the wheels cut into the pipe

Table 3-4 Quantity of Oakum in Pipe Joints

Pipe DiameterWeight of Oakum per jointcmInkg502.05753.081004.151255.231506.35Connecting joints of cast iron pipes 1. Insert the spigot end of pipe into the fitting into the hub of pipeTable 3-5 Quantity of Lead per Pipe Joint

Pipe DiameterWeight of Oakummmkg50.5075.801001.001251.501502.003-4 Galvanized steel pipeIn working with galvanized steel pipe we consider the following :Direct ConnectionMeasuring and CuttingThreading operationsSizing the pipes

Galvanized steel pipeBasic rules in governing the threading operations:Know the sizePlace the galvanized steel pipe in a vice or workbench that is high enough off the groundNever hold the threaded parts with a wrench. Put two nuts on them, lock tightly and continue the threading operations.5. Apply motor oil or cutting oil regularly to protect the threader and the thread of pipe6. The threads should be slightly tapered7. Put Teflon tape in a clockwise direction on the threaded portion of the pipe 8. It is more economical to use of ready-made nipples ranging from 2 inches to 12 inches long.

Table 3-6 Length of Screwed Pipe into Fitting

Pipe Diametermm inchesStandard Fitting (cm)Drainage Fitting (cm)121/21.2-203/41.2-2511.6-321 1.61.6381 1.61.65022.01.6753-2.21004-2.5Table 3-7 Pipe Diameter Equivalent in mm

Circumference String Length546783113133150Pipe size (mm)101320253238Equivalent (in)3/81/23/411 1 DETERMINING THE GALVANIZED IRON PIPE DIAMETER

Before you can do any home plumbing repairs, you need to know the size of the pipe that is needed. In the absence of a measuring caliper, we can measure the inside diameter of a pipe by measuring the outside circumference using a string.Table 3-8 Wall Clearance For Pipe Installation

Pipe SizePipe AlonePipe and FittingFor turning fitting381 5.0 cm7.5 cm15.0 cm5026.3 cm8.8 cm17.5 cm7538.8 cm12.5 cm25.0 cm1004113.0 cm15.0 cm30.0 cmTable 3-9 Length of Teflon Tape On Pipe Joint

Number of TurnPipe Diameter in Millimeter101220253238501.054.067.083.113.123.150.2002.108.134.166.226.236.300.4003.162.201.249.339.350.450.6004.216.268.332.452.492.600.8005.270.335.415.565.615.7501.006.324.402.498.678.738.9001.207.378.469.581.791.8611.051.408.432.536.664.904.9841.201.603-5 copper pipeCUTTINGUsing a regular hacksaw or a copper tube cutter.Use a jig or miter box when youre cutting a copper pipe with a hack saw.You can make a jig from a wooden board or block with a vee notch sawed out to hold the pipe in place.