Do-it-yourself welding of polypropylene pipes: instructions


do-it-yourself plumbing

Prod­ucts made from mod­ern poly­mer­ic mate­ri­als have char­ac­ter­is­tics that make it pos­si­ble to use them in water and heat sup­ply sys­tems for res­i­den­tial build­ings and indus­tri­al premis­es.

Due to the pres­ence of spe­cial sta­bi­liz­ing addi­tives in the com­po­si­tion of the poly­mer, the mate­ri­als are resis­tant to water ham­mer and pres­sure drops. The rein­forced polypropy­lene sys­tem will not receive any dam­age dur­ing defrost­ing.

Advantages of polypropylene pipes

The main advan­tages of this mate­r­i­al: polypropylene parts

  • heat resis­tance from + 95 °C (ordi­nary pipes) to 175 °C (rein­forced);
  • low ther­mal con­duc­tiv­i­ty;
  • long ser­vice life;
  • anti-cor­ro­sion prop­er­ties;
  • envi­ron­men­tal friend­li­ness of the com­po­si­tion;
  • lack of salt and lime deposits.

Anoth­er def­i­nite advan­tage is con­nec­tion strength.

Use in the instal­la­tion of struc­tures of mate­ri­als of the same group allows you to cre­ate a mono­lith­ic con­nec­tion.

A light weight polypropy­lene (PP) prod­ucts and ele­men­tary assem­bly make it pos­si­ble to quick­ly and silent­ly do weld­ing with your own hands, even for a begin­ner.

What we are working on. Tools

Apparatus for welding

Appa­ra­tus for weld­ing, in the com­mon peo­ple — “sol­der­ing iron” or “iron”. Works from the mains with stan­dard volt­age (220 V). Pow­er up to 1500 V.

Con­sists of a heat­ing ele­ment (xiphoid man­drel), to which are attached sleeves (noz­zles) with teflon coat­ing. Equipped with heat­ing tem­per­a­ture con­troller and switch.

Com­fort­able han­dle makes it pos­si­ble to car­ry out the process of weld­ing parts in almost any posi­tion.

Nozzles for welding

Replace­able noz­zles, dif­fer­ent diam­e­ters — sold either as a set with a device for weld­ing, or sep­a­rate­ly. With the help of a hex wrench, they are eas­i­ly attached to the man­drel.

Cutting scissors

Pipe shears. Blades of scis­sors are made of high qual­i­ty steel. With their help, you can make an even cut with­out spend­ing a lot of effort.

Pipe cutter at work

Con­ven­tion­al scis­sors are used to work with pipes whose diam­e­ter does not exceed 32 mm. For prod­ucts with a larg­er diam­e­ter, it is nec­es­sary to pur­chase a spe­cial mod­el of the cut­ting tool — pipe cut­ter.

processing of a reinforced part with a shaver

Shaver (or trim­mer) — dou­ble-sided device for remov­ing rein­force­ment. When sol­der­ing rein­forced ele­ments, it is nec­es­sary to remove the out­er pro­tec­tive lay­er for bet­ter weld­ing of sur­faces.

Exter­nal­ly, the shaver has the same holes as the clutch, and inside there are sharp steel knives. Trim­mers for polypropy­lene pipes are avail­able in dif­fer­ent diam­e­ters: their numer­i­cal val­ues ​​are sim­i­lar to pipe diam­e­ters.


bevel­er — a hand tool for strip­ping the con­tour of plas­tic rags.

When using spe­cial scis­sors for cut­ting pipes, the bevel­er is rarely usedbut its pres­ence is nec­es­sary in the event of your debut in the field of plumb­ing.

Roulette construction

Roulette con­struc­tion.

Construction level

Build­ing lev­el. With it, you can cen­ter the ele­ments to be weld­ed, as well as cor­rect­ly mount the fin­ished struc­ture.

Perforator and screwdriver

Ham­mer drill, drill or screw­driv­er. For fas­ten­ing the sol­dered sys­tem to the wall using spe­cial clamps.

Installation instructions and rules

Spe­cial fit­tings are used as con­nect­ing ele­ments for weld­ing:Polypropylene fittings |  scope, installation and ...

  • adapters,
  • tees,
  • cou­plings,
  • cross­es,
  • plugs.

They come in dif­fer­ent diam­e­ters and con­fig­u­ra­tions, com­plete­ly made of plas­tic or with met­al inserts in the form of inter­nal and exter­nal thread­ed ele­ments, union nuts.

Preparatory work:

Step #1

plumbing schemeDraw­ing up a work plan is the first and most impor­tant step. Hav­ing sketched out a dia­gram of the future water sup­ply, you can count the fit­tings with great accu­ra­cy, as well as reduce the amount of weld­ing by weight.

Draw­ing a dia­gramtry to min­i­mize the bends of the fin­ished struc­ture in order to reduce the hydraulic resis­tance to the move­ment of water.

To learn how to pre­pare a work plan and devel­op a scheme for lay­ing a water pipe in a house, see the video:

Step #2

Pur­chase of mate­r­i­al. Pipes and fit­tings must be pur­chased with a mar­gin. There is a high prob­a­bil­i­ty that the work will not go as expect­ed and some of the mate­r­i­al will be cor­rupt­ed, or in the process you will want to slight­ly change the sys­tem con­fig­u­ra­tion.

Step #3

Tool prepa­ra­tion. The cost of the appa­ra­tus for weld­ing and relat­ed devices is not so high.

If the bud­get allows, take care of the pur­chase: it will come in handy for you and your friends can be helped out.

If there is no finan­cial oppor­tu­ni­ty to invest in an instru­ment that is rarely used — rent a device.

All work must be car­ried out at an air tem­per­a­ture above 0 °C.

Welding technology

cutting polypropylene with scissors

  • Cut the pipe with scis­sors.

Wipe the joint with alcohol

  • Before weld­ing the joints must be wiped with alco­hol, degreas­ing the sur­face.

Installation of heating sleeves

  • We select and install the nec­es­sary heat­ing sleeves.
  • Weld­ing machine install on a spe­cial stand and turn on the net­work.
  • Tem­per­a­ture at 260 °C – opti­mal for good qual­i­ty sol­der­ing. Less heat will result in poor adhe­sion of parts.
  • The max­i­mum that can be set is 280 ° C.

We mark the depth of nozzle details

  • Depth of insert­ing parts it will be dif­fi­cult for a begin­ner to deter­mine by eye on a sleeve. To do this, use a mark­er or pen­cil. For pipes with a diam­e­ter of 20 mm, the weld­ing depth is 14 mm (add 2 mm for each sub­se­quent size of the mate­r­i­al diam­e­ter). It is this seg­ment that you need to mark with a mark­er.

Heating parts

  • We are wait­ing for the indi­ca­tor to turn off, noti­fy­ing about the heat­ing process, and pro­ceed to weld­ing the parts. To do this, you need to heat the edges of the con­nect­ing ele­ments by insert­ing them into the sleeve from oppo­site sides.
  • If you are using rein­forced polypropy­lene pipesthen before sol­der­ing it is nec­es­sary to clean the top lay­er from the cut sur­face with a shaver, and then degrease and weld.

Sol­der­ing time table for polypropy­lene pipes

Out­er pipe diam­e­ter (mm) Heat­ing time (sec.) Con­nec­tion time (sec.) Cool­ing time (sec.)
16 5 four 2
twen­ty 7
25 7
32 eight 6 four
40 12
fifty eigh­teen
63 24 eight 6
75 thir­ty ten eight
  • Do not arbi­trar­i­ly increase the heat­ing time — plas­tic can melt and change the inner diam­e­ter of the prod­ucts, which will lead to a dis­rup­tion in the process.

Connection of parts

  • Remove the parts from the noz­zle and imme­di­ate­ly con­nect to each oth­er. The plas­tic in the places of heat­ing will be still plas­tic for a cou­ple of sec­onds, which will allow you to cen­ter the prod­uct. Expe­ri­enced crafts­men do it by eye, and you will need a build­ing lev­el.

You can use the plumb­ing sys­tem no ear­li­er than one hour after the com­ple­tion of all work.

Spike in hard to reach places

Spike in hard to reach places car­ried out by sep­a­rate small units, and then con­nect­ed to oth­er struc­tur­al ele­ments.

If you have a ready-made wiring dia­gram with accu­rate mea­sure­ments, there will be no prob­lems with the sol­der­ing process at a point with poor access.

By sol­der­ing most of the sys­tem on any sol­id sur­face, you will make it eas­i­er for your­self to work fur­ther. Climb­ing into hard-to-reach places and sol­der­ing while sit­ting or stand­ing in the most uncom­fort­able posi­tions you will have to do a lit­tle.

Installing pipes on the wall is car­ried out using plas­tic clips of a suit­able diam­e­ter, which are mount­ed on dow­els or com­bined with them. You can fix clips on a con­crete wall with a punch­er, on a wood­en one — with a screw­driv­er.

For more infor­ma­tion on how to eas­i­ly and sim­ply weld polypropy­lene pipes with your own hands, see the video:

How to install a weld-in saddle

Making a hole before welding the saddle

There is one more method of weld­ing parts of the water sup­ply — using weld­ed sad­dles. This option is good because, thanks to a spe­cial fit­ting, this con­nec­tion sim­pli­fies the process of cre­at­ing bends.

Heating parts before welding

Con­ve­nient to use this type of align­ment on pipes with a large diam­e­ter, but this requires spe­cial noz­zles for a “sol­der­ing iron” and a drill to pre­pare a hole in the pipe. The entire fur­ther work process is sim­i­lar to that pre­vi­ous­ly described: clean, degrease, etc.

Connection of parts when welding saddles

Prices for equipment and services

The aver­age price of a sim­ple pipe weld­ing machine is 30 dol­lars. There are instances of 500 dol­lars each, but this is a tech­nique for the pros.

A polypropy­lene pipe costs from 20 to 1 dol­lars per lin­ear meter. The price depends on the diam­e­ter of the prod­uct and the pres­ence or absence of a rein­forced lay­er. The cost of fit­tings is from 10 to 3 dol­lars.

Prices for plumb­ing work dif­fer slight­ly. On aver­age, a com­plex pipe lay­out, 12 meters long with tees and oth­er con­nec­tions, will cost you at least 110$.

The com­plex­i­ty of the work and the pres­ence of hard-to-reach areas sig­nif­i­cant­ly increase the cost of the final cost.

What do SNiPs say

The active use of plas­tic pipes became pos­si­ble thanks to the offi­cial per­mis­sion:

  • SNiP 2.04.05–91 “Heat­ing, ven­ti­la­tion and air con­di­tion­ing”;
  • SNiP 2.04.01–85 “Inter­nal water sup­ply and sew­er­age of build­ings”.

Basic require­ment — the man­u­fac­tur­er must have a license, and the mate­r­i­al itself must ful­ly com­ply with the san­i­tary stan­dards of the EU.

If you observe the tem­per­a­ture regime — plas­tic plumb­ing will last for decades.

Get­ting start­ed with weld­ing, prac­tice before­hand. Do not spare a piece of pipe and the cheap­est cou­pling — it’s worth it.

SNIP 2.04.05 91 down­load

SNIP 2.04.01 85 down­load

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