Properties and scope of galvanized pipe insulation


Gal­va­nized insu­la­tion of steel pipes is an impor­tant pro­ce­dure that increas­es their ser­vice life. With prop­er instal­la­tion, the lines will always be pro­tect­ed from atmos­pher­ic influ­ences, the main thing is to fol­low all the rules for lay­ing the cas­ing and fol­low the basic rec­om­men­da­tions.

Why and from what to protect the pipeline

Gal­va­nized insu­la­tion pro­tects the pipes from the weath­er

Pipes are made of iron, met­al alloys, plas­tic, met­al-plas­tic. All of them have their own “life” and wear out dur­ing oper­a­tion under the influ­ence of the envi­ron­ment in which they are locat­ed (pre­cip­i­ta­tion, sun, tem­per­a­ture, air humid­i­ty, soil or water pres­sure). In addi­tion, the wear of the line occurs from the inside under the influ­ence of trans­port­ed sub­stances. There­fore, in order to extend the time of their oper­a­tion, pro­tec­tion is sim­ply nec­es­sary.

Met­al pipes are strong, reli­able, but not pro­tect­ed from cor­ro­sion, cor­rod­ing the pipe from the out­side. If insu­la­tion is not made, then in the near future their walls will lose their strength and will require replace­ment in the near future.

In the absence of insu­la­tion, pipes quick­ly become rusty

Cor­ro­sion occurs when:

  1. High humid­i­ty, rain, snow. With direct con­tact, the iron rusts, the pipe walls become thin­ner and col­lapse.
  2. Expo­sure to chem­i­cals. The met­al is also cov­ered with rust, which leads to the destruc­tion of pipes — typ­i­cal for chem­i­cal pro­duc­tion.
  3. Wan­der­ing cur­rent. Elec­tric cur­rent destroys met­al lines in the ground.
  4. Low air tem­per­a­ture. Frost leads to a decrease in the tem­per­a­ture of the pass­ing liq­uid or its freez­ing (water, fuel oil, oil, solar­i­um, etc.). As a result, con­den­sate appears on the sur­face of the pipes.

All of the list­ed types of destruc­tive phe­nom­e­na, destroy­ing the trans­port main of the pipeline, cause loss­es asso­ci­at­ed with the repair and loss of trans­port­ed prod­ucts.

How to protect the pipe from destruction

Gal­va­nized Steel Pipe Insu­la­tion


The ser­vice life of pipes depends on the con­di­tions of their oper­a­tion, main­te­nance and ser­vice. A met­al water pipe, being in the ground with­out insu­la­tion, becomes unus­able after 10 years of oper­a­tion, and pos­si­bly ear­li­er, tak­ing into account the pres­ence of the harm­ful fac­tors list­ed ear­li­er.

Gas dis­tri­b­u­tion lines, oil pipelines, heat­ing mains, despite the fact that they are locat­ed above the ground, with the absence of insu­lat­ing mate­ri­als, will become unus­able after about the same time. In the joints where the met­al has under­gone a ther­mal load (weld­ing work), wear will occur faster.

Impor­tant! With prop­er instal­la­tion of gal­va­nized insu­la­tion of pipelines, the peri­od of their oper­a­tion increas­es to 40 years.

There are two options for solv­ing the prob­lem:

  1. Replace met­al with plas­tic.
  2. Use insu­lat­ing mate­ri­als to pro­tect met­al pipelines.

Met­al is more reli­able than plas­tic and, if prop­er­ly pro­tect­ed from cor­ro­sion, it will last longer than stat­ed. Due to its strength, it is more expe­di­ent to use met­al pipes. You can pro­tect them from the effects of exter­nal destroy­ers in var­i­ous ways:

  • cov­er with paint or resin;
  • use water­proof­ing for pipe wind­ing;
  • fin­ish the sur­face with poly­eth­yl­ene;
  • cov­er with polyurethane foam.

But, the list­ed mate­r­i­al also needs pro­tec­tion, as it gets under the influ­ence of the active medi­um. There­fore, the best solu­tion for pro­tect­ing pipe ele­ments is the use of gal­va­nized insu­la­tion. Such a coat­ing is prac­ti­cal­ly not sub­ject to cor­ro­sion process­es. It can with­stand tem­per­a­tures from ‑3500C to + 4200C. It all depends on the method of gal­va­niz­ing the steel.

Where is the protective galvanized casing used?

Gal­va­nized insu­la­tion applied to gas pipes

Gal­va­nized cas­ing is used to pro­tect and insu­late chim­neys, exhaust gas pipes in pri­vate homes. Also used for pipelines in the oil indus­try.

A zinc cas­ing is an indis­pens­able thing for cov­er­ing the sur­face of heat­ing mains. It not only pro­tects the met­al from destruc­tion, but also reduces heat loss.

Advan­tages of gal­va­nized insu­la­tion:

  • attrac­tive appear­ance;
  • easy instal­la­tion;
  • dura­bil­i­ty.

In the chem­i­cal indus­try, zinc cas­ing is used to pro­tect work­ers from acci­den­tal con­tact with hot sur­faces, which can cause injury to a per­son.

Technology for installing a galvanized casing

Instal­la­tion of a gal­va­nized cas­ing begins with the fas­ten­ing of the insu­la­tion


Dur­ing instal­la­tion work, the cas­ings are con­nect­ed to each oth­er, thanks to the avail­able lock­ing recess­es. Addi­tion­al­ly, at the dock­ing points, clamps and dress­ings are used. Pipelines do not always have an ide­al straight line, and form geo­met­ric shapes of dif­fer­ent lev­els: cor­ner tran­si­tions, arch­es, ledges.

Impor­tant! The insu­la­tion must adhere tight­ly to the sur­face of the pipe. In cas­es where space is avail­able, mois­ture can pen­e­trate and con­tin­ue to degrade the mate­r­i­al.

To iso­late such forms, com­pli­cat­ed types of cas­ings are used:

  • cylin­der, with over­head latch­es;
  • fit­ting (tee), — to pro­tect the pipeline at the branch­ing points;
  • spher­i­cal cone;
  • remov­able box­es — to pro­tect oper­at­ing elec­tric motors and valves.
Turns for mount­ing gal­va­nized insu­la­tion

Instal­la­tion of a gal­va­nized cas­ing is car­ried out man­u­al­ly — by a team of work­ers, tak­ing into account the pre­vi­ous­ly installed ther­mal insu­la­tion. It can be any kind of min­er­al insu­la­tion: min­er­al wool, basalt slabs, extrud­ed poly­eth­yl­ene, etc. After lay­ing, the mate­r­i­al must be fixed with a wire frame. For this, rods are installed that pre­vent slip­ping of con­nect­ing rings and ban­dages.

Due to its col­lapsi­ble design, the instal­la­tion of cas­ings does not require spe­cial qual­i­fi­ca­tions of work­ers. Gal­va­nized, plas­tic, easy to cut, drill and not dif­fi­cult for oper­a­tions relat­ed to fit­ting parts. Requires a min­i­mum of tools and skills.

Pro­tect engi­neer­ing struc­tures with gal­va­nized insu­la­tion. This will not only extend the life of your sys­tems: water and gas sup­ply, trans­port of oil, fuel oil and oth­er refined prod­ucts, save heat and give your struc­tures a beau­ti­ful look.


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