Types and features of insulation of galvanized steel pipes

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Steel prod­ucts have long been used for lay­ing engi­neer­ing com­mu­ni­ca­tions in var­i­ous areas. Due to their reli­able per­for­mance, they con­tin­ue to be active­ly pur­chased despite the intro­duc­tion of many new plas­tic and poly­eth­yl­ene prod­ucts.

Varieties and applications

The most pop­u­lar of all types of steel prod­ucts are gal­va­nized pipes, which dif­fer in pur­pose:

  • to cre­ate a water sup­ply;
  • con­duct­ing house­hold and busi­ness com­mu­ni­ca­tions;
  • gas pipelines;
  • heat­ing sys­tem instal­la­tions.
Gal­va­nized steel pipeline

Depend­ing on the appli­ca­tion, they are made in dif­fer­ent diam­e­ters, accord­ing to estab­lished stan­dards:

  • For con­duct­ing water and gas, pipes man­u­fac­tured in accor­dance with GOST 3262 are used;
  • Elec­trow­eld­ed prod­ucts meet the stan­dards of GOST 10704;
  • Seam­less and pro­file.

To install a water sup­ply sys­tem in an apart­ment, as well as cre­ate a heat­ing sys­tem, pipes made in accor­dance with GOST 3265 are used. They have a num­ber of advan­tages:

  • Anti-cor­ro­sion resis­tance. This is espe­cial­ly impor­tant in the appli­ca­tion of steel prod­ucts. Thanks to the gal­va­nized coat­ing, the plumb­ing does not rust and lasts much longer;
  • Ser­vice life of sys­tems from gal­va­nized met­al exceeds 25 years.;
  • Com­pared to con­ven­tion­al met­al ele­ments of the sys­tem, they are much lighter. This sim­pli­fies the work and trans­porta­tion of these prod­ucts;
  • Con­ve­nient when cre­at­ing the desired design. They can be cut to the desired dimen­sions, weld­ed and joined in a spe­cif­ic con­fig­u­ra­tion.
Met­al prod­ucts of dif­fer­ent diam­e­ters

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Out­ward­ly, all steel prod­ucts look the same, they dif­fer in wall thick­ness. To cre­ate plumb­ing and heat­ing in a res­i­den­tial area, ele­ments of an aver­age accu­ra­cy class are used. If out­door use is intend­ed, then insu­la­tion of all gal­va­nized steel pipes will be required, oth­er­wise the liq­uid in the pipeline may sim­ply freeze and cre­ate a lot of prob­lems with the life sup­port of the house.

First you need to under­stand the types and fea­tures of insu­la­tion.

Types of insulation

The coat­ing with an insu­lat­ing lay­er can be applied from the inside and out­side, on a pipeline with a diam­e­ter of con­stituent ele­ments from 57 to 530 mm. To apply the top lay­er, extrud­ed poly­eth­yl­ene is used. Insu­la­tion of the inner walls is car­ried out with liq­uid heaters. Each method of insu­la­tion has its pos­i­tive and neg­a­tive sides, which must be con­sid­ered.

Foam polymer

PPM insu­la­tion is car­ried out in three pro­tec­tive lay­ers:

  • The first pro­tects against liq­uid ingress to the sur­face, pro­tect­ing against cor­ro­sive process­es. The lay­er den­si­ty reach­es 100 mm;
  • The sec­ond lay­er is ther­mal insu­la­tion. The foam poly­mer mate­r­i­al has a porous struc­ture, this allows you to increase the tem­per­a­ture of the pass­ing liq­uid. The den­si­ty of this lay­er depends on the cli­mat­ic con­di­tions of res­i­dence;
  • The top lay­er is used to pro­tect against mechan­i­cal dam­age, as well as for water­proof­ing. Den­si­ty reach­es 15 mm. It is on this indi­ca­tor that the strength of the entire struc­ture depends.
Pro­duc­tion appli­ca­tion of ther­mal insu­la­tion

Pipes with PPM insu­la­tion are man­u­fac­tured at the fac­to­ry in fin­ished form. They are used for lay­ing engi­neer­ing com­mu­ni­ca­tions under­ground or in an open way.

polyurethane foam

PPU insu­la­tion for gal­va­nized pipes is made from Izolan and Varatek mate­ri­als. To increase the reli­a­bil­i­ty of the insu­la­tion, the coat­ing has an upper gal­va­nized lay­er.

Prod­ucts with this insu­lat­ing mate­r­i­al are man­u­fac­tured in accor­dance with GOST 30732. Accord­ing to the stan­dards, the coat­ing must com­ply with the fol­low­ing char­ac­ter­is­tics:

  • the lay­er thick­ness must be at least 60 kg per cubic meter;
  • coat­ing strength dur­ing defor­ma­tion more than 0.3 MPa;
  • ther­mal con­duc­tiv­i­ty coef­fi­cient from 0.033 W at a heat­ing tem­per­a­ture of 50ºС.

These para­me­ters make it pos­si­ble to use prod­ucts with PPU insu­la­tion for lay­ing heat­ing mains with increased pres­sure up to 1.5 MPa.

Reinforced (double)

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Such an insu­lat­ing coat­ing pro­tects met­al ele­ments from the effects of elec­tric cur­rent. It con­sists of sev­er­al lay­ers, which are divid­ed into the main and addi­tion­al parts. Rein­forced insu­la­tion of gal­va­nized steel pipes is reg­u­lat­ed by GOST 16703 and is a sin­gle design sys­tem that pro­vides pro­tec­tion against elec­tri­cal dam­age com­pa­ra­ble to dou­ble insu­la­tion.

This type of prod­uct is used in the cre­ation of heat­ing net­works and large gas pipelines, in the repair of a build­ing or office. They are not reli­ably pro­tect­ed from cor­ro­sive process­es on the out­side, due to this, their ser­vice life reach­es more than 30 years. At the same time, it is pos­si­ble to install and assem­ble the struc­ture in soil with high humid­i­ty and even in water. The use of these pipes solves many dif­fi­cul­ties with the instal­la­tion of an exter­nal pipeline. They are not afraid of tem­per­a­ture changes and bad weath­er con­di­tions, which will allow them to be used in places of res­i­dence with a harsh cli­mate.

Internal

This type of insu­la­tion is car­ried out at the fac­to­ries of man­u­fac­tur­ers of gal­va­nized met­al prod­ucts and is divid­ed into two types:

  • Anti-cor­ro­sion. It is nec­es­sary to pro­tect against the appear­ance of rust and cor­ro­sion of the inner walls of pipes. The inner sur­face is the most vul­ner­a­ble place, since it is in direct con­tact with the liq­uid, and also expe­ri­ences increased pres­sure on the walls of the struc­ture;
  • Antifric­tion. Its tasks include increas­ing the through­put of the struc­ture, as well as increas­ing the resis­tance to inter­nal fric­tion that accom­pa­nies high-pres­sure flu­ids.
Rein­forced inner wall pro­tec­tion

The use of inter­nal insu­la­tion allows you to increase the ser­vice life, pro­tect against the ingress of bio­log­i­cal­ly harm­ful microor­gan­isms, chem­i­cals into the water, and reduces the lev­el of rough­ness.

Prod­ucts with an inter­nal pro­tec­tive lay­er are dis­tin­guished by:

  • Resis­tant to defor­ma­tion. Insu­la­tion increas­es the elas­tic­i­ty of the walls, allow­ing them to with­stand high tem­per­a­tures;
  • Reli­able pro­tec­tion against cor­ro­sion and rust;
  • High coef­fi­cient of resis­tance to water ham­mer, pres­sure drops.

The choice of inter­nal insu­la­tion direct­ly depends on the place of oper­a­tion of the water sup­ply.

extruded polyethylene

Ther­mal insu­la­tion of a pipe made of gal­va­nized steel using extrud­ed poly­eth­yl­ene takes place in an indus­tri­al envi­ron­ment. It has 3 lay­ers:

  • The inner lay­er, made of epoxy resin, is nec­es­sary to elim­i­nate small defects on the sur­face of the pipe;
  • The mid­dle lay­er serves as a fix­ing base;
  • The top applied lay­er is made of extrud­ed poly­eth­yl­ene.

Due to the con­struc­tion of a puff cake, prod­ucts with such insu­la­tion have a num­ber of unde­ni­able advan­tages:

  • Envi­ron­men­tal friend­li­ness. Poly­eth­yl­ene is safe for the envi­ron­ment and does not harm human health;
  • Hydraulic resis­tance increas­es the ser­vice life of met­al prod­ucts;
  • Increased coef­fi­cient of resis­tance to tem­per­a­ture extremes and pres­sure surges;
  • Anti-cor­ro­sion pro­tec­tion. Thanks to water tight­ness con­tact with aggres­sive envi­ron­ment for met­al is exclud­ed. This pro­tects the pipeline from rust.
Main met­al ele­ments of the pipeline with an insu­lat­ing lay­er

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Resis­tance to high tem­per­a­tures allows the use of this mate­r­i­al for insu­la­tion of chim­neys and heat­ing sys­tems.

Rubber-bitumen mastic

Pipe insu­la­tion using rub­ber-bitu­men mas­tic is car­ried out only to pro­tect against mois­ture pen­e­tra­tion, that is, from the occur­rence of met­al cor­ro­sion. It does not affect oth­er indi­ca­tors (pres­sure, resis­tance, ther­mal con­duc­tiv­i­ty).

Insu­la­tion work is car­ried out accord­ing to the stan­dards defined in the GOST 5116 stan­dards. It is applied in sev­er­al lay­ers:

  • First, the sur­face of the prod­uct is primed for bet­ter adhe­sion to the met­al sur­face;
  • Next, apply mas­tic;
  • The third lay­er is laid non-woven fab­ric, which acts as a pro­tec­tion against mois­ture;
  • The last lay­er is a wrap­per that pro­tects the pipe from mechan­i­cal dam­age.

I use prod­ucts with rub­ber-bitu­men mas­tic to cre­ate water pipes. It is not rec­om­mend­ed to use as a mate­r­i­al for cre­at­ing a heat­ing sys­tem, as they do not tol­er­ate tem­per­a­tures below 10 and above 40 degrees.

Appli­ca­tion of an insu­lat­ing lay­er of rub­ber-bitu­men mas­tic

Any insu­la­tion can increase the char­ac­ter­is­tics of gal­va­nized met­al pipes. To do this, it is impor­tant to choose the right one in accor­dance with the tasks. There­fore, when choos­ing prod­ucts with insu­la­tion, care­ful­ly study all the tech­ni­cal spec­i­fi­ca­tions in order to avoid many prob­lems in the future.

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