How to mint a cast iron pipe


In most build­ings built dur­ing the Sovi­et era, the sew­er sys­tem is made of cast iron pipes. This is due to the fact that such prod­ucts have not only a long peri­od of oper­a­tion, but also are not amenable to var­i­ous influ­ences. How­ev­er, cast iron pipes require prop­er instal­la­tion and prop­er use.

Com­pared to oth­er types of com­mu­ni­ca­tions, res­i­den­tial plumb­ing needs to be replaced very often (every few years). In addi­tion, the instal­la­tion of plumb­ing fix­tures and repairs in the house may require changes in the design of the sys­tem. To per­form caulk­ing of cast-iron pipes in an apart­ment with your own hands, it is not nec­es­sary to under­go spe­cial train­ing. This can be done with only the skills to work with a stan­dard tool. How to prop­er­ly dis­man­tle the old pipe and install a new one, you can find out in this arti­cle.

Work algorithm

Chas­ing a cast iron pipe

Depres­sur­iza­tion of cast iron ele­ments is one of the most dif­fi­cult tasks for self-repair­ing sew­ers. To do the work as quick­ly and effi­cient­ly as pos­si­ble, it is rec­om­mend­ed to pre­pare all the nec­es­sary tools in advance.

For work you need:

  • grinder (with its help you can cut off part of the pipe);
  • grind­ing discs;
  • gog­gles, gloves and mask;
  • sol­der­ing iron (use­ful for heat­ing joints);
  • a ham­mer;
  • screw­drivers of dif­fer­ent sizes and con­fig­u­ra­tions;
  • pipe wrench;
  • chis­el.

Note! To pre­vent the spread of unpleas­ant odors through­out the room and the ingress of var­i­ous debris into the pipeline, close the drain hole with a piece of cloth.

The sequence of work per­formed:

  1. The first step before caulk­ing a cast iron sew­er pipe is to tap the joint with a ham­mer. How­ev­er, this should be done care­ful­ly. Oth­er­wise, you can dam­age the struc­ture, which will lead to a com­plete replace­ment of the ris­er. It is also pos­si­ble to car­ry out such manip­u­la­tions, often using a tool made of wood.
  2. As soon as you fin­ish tap­ping, you should pay atten­tion to the con­di­tion of the fas­ten­ers. If the pipe runs from side to side, and it is pos­si­ble to dis­con­nect it, the fol­low­ing must be done. It is nec­es­sary to swing the prod­uct by pry­ing it with a screw­driv­er. The rope should be hooked with pli­ers and care­ful­ly pulled out.

Advice! Dur­ing the pro­ce­dure, you should pump the pipe more and more.

  1. If even after fre­quent and pro­longed knocks with a ham­mer, the pipe did not change its posi­tion, we can con­clude that the fas­ten­ing was car­ried out using sul­fu­ric solu­tion. To remove fas­ten­ers, you must first burn the dried mix­ture. This can be achieved in sev­er­al stages. The first step is to heat up the joint with a sol­der­ing iron. You need to do this in a cir­cle. Next, you need to con­tin­ue to knock with a ham­mer, try­ing not to vio­late the integri­ty of the prod­uct. If the struc­ture of the ele­ments began to stag­ger, you can try to dis­man­tle the ele­ment with a key.
Heat­ing up the joint with a sol­der­ing iron


  1. Hav­ing suc­cess­ful­ly dis­man­tled the prod­uct, you should thor­ough­ly clean the joints with a chis­el. The empha­sis should be on clean­ing the edges, as a rub­ber seal will be installed in this place.
  2. Before instal­la­tion, the seal­ing mate­r­i­al must be lubri­cat­ed with a spe­cial agent.
  3. The last step is the instal­la­tion of a new prod­uct in the pre­pared area.
Clean­ing up the junc­tion

When burn­ing sul­fur, it is imper­a­tive to wear a pro­tec­tive mask and gog­gles. They will not allow harm­ful vapors to enter the body.

Avoiding problems

With a strong impact on the pipe, cast iron can deform

It must be remem­bered that the tech­ni­cal char­ac­ter­is­tics of cast iron are not ide­al. Prod­ucts made from such mate­r­i­al are quite frag­ile. Low-qual­i­ty cast iron is sub­ject to defor­ma­tion when exposed to liq­uid, as well as the process­es that take place in it. Chang­ing tem­per­a­ture regimes can also neg­a­tive­ly affect the resis­tance of such pipes, which reduces their abil­i­ty to car­ry strong pres­sures.

The process of chas­ing cast iron sew­er pipes, as can be seen from the arti­cle, is quite sim­ple. As for the instal­la­tion, here you will need to work a lit­tle.

When installing ele­ments, you need to use heat­ed resin

The ele­ment to be installed must be qual­i­ta­tive­ly strength­ened at the junc­tion by apply­ing a lay­er of resin. A tighter fix­a­tion can be achieved with the help of spe­cial tools. They are sold in hard­ware stores.

Advice! Before caulk­ing a cast iron sew­er pipe, the first thing to do is to cal­cu­late the space for installing a new pipe and, if nec­es­sary, house­hold appli­ances.


If your plumb­ing sys­tem needs par­tial replace­ment, then this process should not be post­poned. This is due to the fact that even the small­est crack can grow in a fair­ly short time, which will entail high costs.

Sewer pipe connection

Dur­ing the instal­la­tion of pipes in the sew­er pipeline, emp­ty spaces may appear at the joints. Often this affects the cor­rect oper­a­tion of the sys­tem. For a high-qual­i­ty con­nec­tion with the removal of all holes and voids, it is nec­es­sary to use spe­cial mate­ri­als. The most pop­u­lar options are the use of cement and asbestos cement.

The use of cement mor­tars

Cement mor­tar for seal­ing joints

The seal­ing mate­r­i­al must be installed first. To do this, you need to use a rope that is pre-impreg­nat­ed with resin. Then the pre­pared seal must be wrapped around the edge of the pipe from the out­side. This will pre­vent the rope from get­ting into the depth of the pipe.

Impor­tant! The use of spe­cial tools will increase the speed of work by a third.

Pre­pare the solu­tion as fol­lows. The ratio of water and cement should be 9:1. In cold weath­er, a well-heat­ed liq­uid should be used. After allow­ing the mix­ture to cool, apply it to the attach­ment areas. You can tamp the solu­tion inside the seams with a ham­mer. To ensure bet­ter adhe­sion of cement to the sur­face and oth­er mate­ri­als, it is nec­es­sary to cov­er the fin­ished area with a wet cloth.

Com­pound with cement and asbestos

A mix­ture of cement and asbestos for seal­ing pipes

The method of using an asbestos-based solu­tion is sim­i­lar to the pre­vi­ous method. It is per­fect for mount­ing pipes made of cast iron and oth­er mate­ri­als.

Action algo­rithm:

  • Mix dry asbestos with cement in a bowl in a ratio of 1:2;
  • Next, add a small amount of water and let the mix­ture stand for a while. Then mix the com­po­si­tion until smooth.

It is impos­si­ble to say which is the best way to fix pipes. With the cor­rect appli­ca­tion of any of the fas­ten­ing meth­ods, good results can be achieved.

In order to qual­i­ta­tive­ly car­ry out work on the dis­man­tling and strength­en­ing of the ele­ments, you should know all the sub­tleties and rules of the pro­ce­dure. Only then can you be sure that your sys­tem will last for many years and will not make itself felt. The process con­sists of many com­plex steps. There­fore, in order to qual­i­ta­tive­ly fix the con­nec­tions of cast-iron sew­er pipes with your own hands, you must fol­low the tips and rec­om­men­da­tions.


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