Overview of PVC sewer pipes


Sew­er lines are sub­ject to wear and need to be replaced over time. Polyvinyl chlo­ride prod­ucts in the plumb­ing mar­ket have shown them­selves on the pos­i­tive side and will soon replace out­dat­ed cast-iron equip­ment.

Types of PVC pipes

Polyvinyl chlo­ride is an inno­v­a­tive mate­r­i­al used for the man­u­fac­ture of pipes and fit­tings. It is used when car­ry­ing out inter­nal and exter­nal sew­er­age, grav­i­ty drain, pres­sure lines, etc.

When lay­ing sew­er lines, they rely on the rec­om­men­da­tions of the man­u­fac­tur­ers: PVC prod­ucts for inter­nal sewage are exclu­sive­ly gray, and for exter­nal arrange­ment they are orange.

Sew­er pipes and fit­tings

The use of PVC prod­ucts for indoor use and a wide range of fit­tings allow you to cre­ate lines of any con­fig­u­ra­tion. Their strength and reli­a­bil­i­ty will cope with the loads that arise in pipeline net­works. How­ev­er, this type is cat­e­gor­i­cal­ly inap­plic­a­ble for out­door use as it is not rigid enough.

Exter­nal PVC pipes must not be used inside the house, as they are unsta­ble to ele­vat­ed tem­per­a­tures. The scope of their oper­a­tion is exter­nal com­mu­ni­ca­tion lines. Pipe diam­e­ter of 100–150 mm allows sewage removal from var­i­ous build­ings. Wall thick­ness is the main fac­tor respon­si­ble for strength and dura­bil­i­ty.

Regard­ing the area of ​​appli­ca­tion, PVC sew­er pipes are divid­ed into:

  • SN‑2 is a light­weight ver­sion, used in sec­tions with light loads, in par­tic­u­lar, in res­i­den­tial areas and when lay­ing house­hold com­mu­ni­ca­tions sys­tems indoors.
  • SN‑4 — com­pact­ed ver­sion, used when lay­ing sew­er lines under roads, where there is a mod­er­ate traf­fic load;
  • SN‑8 is a heavy-duty ver­sion designed for urban sew­ers and areas with a high lev­el of traf­fic.
Types of sew­er fit­tings


When assem­bling PVC sew­ers, shaped prod­ucts occu­py an impor­tant place:

  • cross­es and tees used for wiring;
  • turn sig­nals, due to which the direc­tion changes;
  • reduc­ers designed to con­nect sew­er pipes of dif­fer­ent diam­e­ters made of PVC;
  • noz­zles — allow you to reduce the effect of lin­ear expan­sion on com­mu­ni­ca­tions;
  • cou­plings, plugs, revi­sions, clamps, etc.

It should be borne in mind: the few­er bends, the more eco­nom­i­cal the instal­la­tion, while the design will be more prac­ti­cal.

Impor­tant! When lay­ing the pipeline with your own hands, the price will con­sist not only of the cost of the main mate­r­i­al, but also of aux­il­iary ele­ments, and it is much high­er than the price of a PVC pipe.

Advantages and disadvantages of PVC products

PVC equip­ment has a num­ber of advan­tages in com­par­i­son with met­al:

  • not sub­ject to cor­ro­sion;
  • has smooth walls that pre­vent the for­ma­tion of pre­cip­i­ta­tion;
  • does not con­duct elec­tric­i­ty;
  • is not a source of harm­ful sub­stances;
  • sus­cep­ti­ble to tem­per­a­ture changes;
  • long ser­vice life;
  • ease of assem­bly and instal­la­tion;
  • demo­c­ra­t­ic price.

Like any oth­er equip­ment, PVC sys­tems have weak­ness­es:

  • PVC prod­ucts used at tem­per­a­tures below 15˚C need ther­mal insu­la­tion;
  • low lev­el of ther­mal con­duc­tiv­i­ty;
  • it is not rec­om­mend­ed to use PVC pipes in places where the oper­at­ing tem­per­a­ture is above 60˚С;
  • the pres­ence of dam­age reduces the ser­vice life and resis­tance to stress.
Sew­er insu­la­tion

Impor­tant! PVC pipes locat­ed in the apart­ment do not need an insu­lat­ing coat­ing. With exter­nal lay­ing of com­mu­ni­ca­tions, it is nec­es­sary to insu­late and insu­late the pipeline.


Specifications of PVC pipes

The length, diam­e­ter and wall thick­ness are the main para­me­ters accord­ing to which the dimen­sions of PVC pipes are deter­mined. The table below shows the stan­dard sizes of PVC sew­er pipes and their prices.

Type of sew­er­age

Exter­nal ⌀, mm Inter­nal ⌀, mm Length, mm Min wall thick­ness, mm Aver­age clear­ance, mm Max wall thick­ness, mm

Price, rub / m

Inter­nal 32.0 30.0 from 300

up to 3000

1.0 28.4 1.8 from 24.0
40.0 38.0 1.0 36.4 1.8 from 29.0
50.0 47.4 1.3 46.4 1.8 from 51.0
75.0 71.2 1.9 70.4 2.3 from 130.0
90.0 85.6 2.2 84.4 2.8 from 199.0
110.0 104.6 2.7 103.2 3.4 from 606.0
Exter­nal 125.0 118.6 from 1200

up to 3000

3.2 117.2 3.9 from 229.0
160.0 153.6 3.2 150.2 4.9 from 2300.0
200.0 192.2 3.9 187.6 6.2 from 3800.0
250.0 240.2 4.9 234.6 7.7 from 4300.0
315.0 302.6 6.2 295.6 9.7 from 3500.0
400.0 384.6 7.7 375.4 12.3 from 10000.0
500.0 480.4 9.8 469.4 15.3 from 14900.0
630.0 605.4 12.3 591.4 19.3 from 27700.0
800.0 769.2 15.4 751.0 24.5 from 33 000.0
1000.0 960.8 19.6 938.8 30.6 from 71400.0
1200.0 1151.0 24.5 1126.8 36.6 From 92300.0
Out­let for wash­ing machine


In accor­dance with build­ing codes, PVC pipe diam­e­ters are used:

  • 25 cm — for wash­ing machines;
  • from 30 cm to 47 cm — for sinks;
  • 50 cm — for wiring com­mu­ni­ca­tions in the room;
  • from 70 cm to 86 cm — a lay­er from the ris­er;
  • from 100 cm to 118 cm — for the toi­let;
  • from 150 cm to 190 cm — a seg­ment from the ris­er to city com­mu­ni­ca­tions;
  • 200 cm — drainage of waste­water;
  • from 240 cm to 300 cm — drainage from reser­voirs, pools, jacuzzi;
  • from 300 cm to 1100 cm — urban sew­er­age sys­tems.

Note! When lay­ing the sew­er sys­tem, one should adhere to the require­ments of SNiP, oth­er­wise the stag­na­tion of waste promis­es very unpleas­ant con­se­quences.

Sock­et con­nec­tion

An impor­tant role in the con­duct and instal­la­tion of sew­er­age is giv­en to the sock­et, the main pur­pose of which is to quick­ly and tight­ly con­nect. Below is a table that shows the stan­dard sizes of sock­ets.

Rat­ed pipe ⌀, cm

Inter­nal ⌀ sock­et,


Bell length, cm Mount­ing length, cm
elon­gat­ed Nor­mal elon­gat­ed


63.0 63.1 36.1 22.8 24.2 22.8
50.0 50.1 32.3 20.0 21.2 20.0
40.0 40.1 29.1 17.8 18.8 17.8
31.5 31.6 27.2 15.8 17.1 15.8
25.0 25.1 26.5 12.5 16.7 12.5
20.0 20.1 22.6 9.0 13.3 9.0
16.0 16.1 21.4 7.4 12.3 7.4
11.0 11.1 20.1 5.8 11.3 5.8


The main para­me­ters of the PVC sew­er pipe

The weight of a PVC prod­uct depends on the wall thick­ness and diam­e­ter. How­ev­er, this indi­ca­tor will be many times less than that of met­al ones that are iden­ti­cal in para­me­ters. At the same time, man­u­fac­tur­ers are try­ing to reduce the mate­r­i­al con­sump­tion of the prod­uct with­out loss of strength. Detailed infor­ma­tion about the weight of one lin­ear meter of PVC sew­er pipe can be found in the table below.

diam­e­ter, mm SN‑4 SN‑8
Weight, gr Weight, gr
160 1830 2300
200 2900 3400
250 5000 5900
315 7900 9500
400 12800 15300
500 19600 24700

In addi­tion to the above, selec­tive infor­ma­tion on pres­sure ver­sus wall thick­ness can be found by view­ing the table below.

Diam­e­ter, mm Min­i­mum wall thick­ness
Series, S
12.5 16 ten 5 eight
Pres­sure PN, atm
PN‑8 (atm) PN‑6 (atm) PN-10 (atm) PN-20 (atm) PN-12.5 (atm)
630 2.4675 1.9740 2.9610 5.7246 3.7506
315 1.4805 1.4805 1.5792 2.8623 1.8753
900 3.4545 2.7636 4.2441 8.0934 5.3298
400 1.5792 1.4805 1.8753 3.6519 2.3688
750 2.8623 2.2701 3.5532 6.7116 4.4415
500 1.9740 1.5792 2.3688 4.5402 2.9610

Impor­tant! When pur­chas­ing a PVC pipe for sew­er­age, it is worth request­ing a qual­i­ty cer­tifi­cate to com­pare the declared and actu­al prod­uct val­ues.


PVC Pipe Buying Guide

A huge vari­ety of PVC pipes often puts the buy­er in a dif­fi­cult posi­tion, there­by com­pli­cat­ing the choice. Before pur­chas­ing, it is nec­es­sary to care­ful­ly study the tech­ni­cal and phys­i­cal prop­er­ties of the prod­uct and decide in what con­di­tions it will be used.

Appli­ca­tion con­di­tions
  • Strength. Sag­ging may occur on long sec­tions of the pipeline. This phe­nom­e­non can occur when low den­si­ty PVC sew­er pipes are used. In such sit­u­a­tions, spe­cial brack­ets are rec­om­mend­ed.
  • Appli­ca­tion con­di­tions. The time of use of the sew­er­age sys­tem can be sig­nif­i­cant­ly reduced in cas­es where the oper­at­ing con­di­tions are vio­lat­ed; for exam­ple, when aggres­sive par­ti­cles appear in the pipeline.
  • The length of the high­way. Before design­ing a sew­er, it is nec­es­sary to make accu­rate mea­sure­ments in accor­dance with the lin­ear char­ac­ter­is­tics of PVC pipes; in straight long sec­tions, it is bet­ter to use sol­id ones.
  • Diam­e­ter. On sec­tions of the sew­er line, pipes of one or anoth­er sec­tion are used. So, for drain­ing in the bath­room, prod­ucts with a diam­e­ter of 50 mm are used, and when docked to the cen­tral ris­er — 100 mm.

PVC pipes are reli­able and prac­ti­cal, there­fore lead­ing the plumb­ing mar­ket. Before sew­er­age, you should care­ful­ly study the tech­ni­cal char­ac­ter­is­tics and require­ments for oper­at­ing con­di­tions, com­pli­ance with which can sig­nif­i­cant­ly increase the ser­vice life.


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