Service life of gas pipes in an apartment building: standards and operating features

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Gas sup­ply to the set­tle­ment is car­ried out through a dis­tri­b­u­tion net­work. The deliv­ery scheme con­sists in the pas­sage of fuel through gas pipelines to equip­ment installed in a res­i­den­tial area in accor­dance with accept­ed stan­dards and require­ments of spe­cial con­trol ser­vices.

Rice. 1 gas pipeline

Gas goes through sev­er­al stages of trans­porta­tion:

  • from the place of extrac­tion to the dis­tri­b­u­tion point;
  • from the con­ver­sion point to the city gas net­work.

The gas sup­ply net­work for a pop­u­lat­ed area con­sists of a cer­tain num­ber of dis­trib­uted points, sta­tions and receivers for mon­i­tor­ing the lev­el and pres­sure indi­ca­tors.

The entire net­work is an ordered sys­tem in which intra-yard and intra-house schemes for lay­ing gas pipes are involved.

For the instal­la­tion of any gas pipeline, spe­cial-pur­pose pipes are used. In apart­ment and pri­vate hous­es, steel types are used, they are char­ac­ter­ized as high-strength. They are select­ed accord­ing to the type of pres­sure lev­el of the city net­work:

  • 0.05 kg s/cm 2 for low pres­sure;
  • 0.05 to 3.0 kgf / cm 2 aver­age pres­sure;
  • 3 to 6 kgf / cm 2 — high pres­sure.

Pros and cons of steel gas pipes

Steel prod­ucts have high phys­i­cal prop­er­ties. Despite this, the appli­ca­tion reveals short­com­ings that can affect the ser­vice life and oper­at­ing con­di­tions of gas pipes in apart­ment build­ings.

Advan­tages Flaws
high lev­el strength com­pli­ca­tions dur­ing the dis­man­tling of large areas
suit­able for indoor and out­door use inabil­i­ty to bend the prod­uct in the required place
suit­able for above ground and under­ground lay­ing a large num­ber of ele­ments
ensure unin­ter­rupt­ed sup­ply due to tight­ness and reli­a­bil­i­ty of weld­ing seams light thin-walled prod­ucts are prone to con­den­sa­tion

To facil­i­tate instal­la­tion and con­struc­tion work, pipes made of poly­mer­ic mate­ri­als are put into oper­a­tion in some sec­tions of gas pipelines. They have their own advan­tages and dis­ad­van­tages. They are iden­ti­fied when com­pared with steel struc­tures of this type:

Unlike steel pipes, polypropy­lene pipes are easy to install. The ser­vice life of such pipes can reach up to 80 years. They can only be applied if the gas pres­sure does not exceed 1.2 MPa.

The diam­e­ter of polypropy­lene pipes used for gas wire varies from 20 to 400 mm. Pipes are char­ac­ter­ized by increased through­put com­pared to steel pipes.

The main dis­ad­van­tages are:

  • defor­ma­tion when heat­ed above 80 degrees;
  • dam­age dur­ing seis­mic activ­i­ty or low tem­per­a­tures;
  • destruc­tion of the struc­ture under the influ­ence of ultra­vi­o­let rays.

When using gas pipes in res­i­den­tial premis­es, the fol­low­ing oper­at­ing rules must be observed:

  • lay­ing gas pipes is not pos­si­ble in air ducts, ven­ti­la­tion shafts in apart­ments;
  • pipes should not block door or win­dow open­ings;
  • access to pipes can­not be blocked by wall pan­els, decor of a com­plex degree of dis­man­tling;
  • the dis­tance to the floor sur­face from the gas pipe must be at least 200 cm;
  • instal­la­tion is car­ried out in res­i­den­tial premis­es, the height of which is not low­er than 220 cm;
  • fin­ish­ing of ceil­ings and walls in places of access to gas pipes should not con­tain com­bustible mate­ri­als;
  • weld­ing is used for con­nec­tion, an open approach for inspec­tion and access is pro­vid­ed at the con­nec­tors;
  • the loca­tion of the pipes rel­a­tive to the elec­tri­cal wiring must meet the pre-estab­lished safe­ty require­ments in a par­tic­u­lar res­i­den­tial area;
  • pipe con­nec­tions are pro­vid­ed for kitchens equipped with gas stoves that meet safe­ty stan­dards;
  • the dis­tance from the plates to the walls must be at least 7 cm;
  • res­i­den­tial premis­es in which gas stoves, gas water heaters or boil­ers for heat­ing are installed must have ven­ti­la­tion out­lets;
  • the gas pipeline sys­tem should not be locat­ed near cool­ing appli­ances;
  • when fix­ing the gas pipe on the wall, spe­cial­ly pro­vid­ed devices are used.
Rice. 2 instal­la­tion of the gas sup­ply sys­tem in the apart­ment

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Accord­ing to SNiP (a stan­dard estab­lished for con­struc­tion orga­ni­za­tions), there are require­ments for the phys­i­cal prop­er­ties of the gas pipeline and the dimen­sions of the struc­tures:

  • the thick­ness of the wall of the wired prod­uct should be about 3 mm for lay­ing under­ground, the wall thick­ness for lay­ing above ground — at least 2 mm;
  • the diam­e­ter of steel prod­ucts for the gas pipeline can be from 15 to 100 mm;
  • the through­put of such prod­ucts ranges from 3 to 12 atmos­pheres, the indi­ca­tor depends on the place of pas­sage.

It is cus­tom­ary to call pipes dimen­sion­al, reach­ing 12 m in length. Non-dimen­sion­al pipes are those that exceed this lev­el in length.

There are pre-estab­lished stan­dards that cal­cu­late the ser­vice life of steel prod­ucts for con­duct­ing gas. Steel struc­tures have an approx­i­mate peri­od of 30 years. The peri­od may be affect­ed by the pres­ence of exter­nal fac­tors. Spe­cial con­di­tions cre­ate risks of reduced ser­vice life.

Signs by which you can deter­mine that the pipes need to be replaced

Before pro­ceed­ing to the replace­ment process, util­i­ties con­duct appro­pri­ate exam­i­na­tions and mea­sure­ments. Based on the actions tak­en, pro­to­cols are drawn up, and gas pipeline prod­ucts are pre­pared for replace­ment.

Rice. 3 gas meter in the apart­ment

Based on the results of the check, a replace­ment is nec­es­sary if:

  • there was a thin­ning of the walls above the norm;
  • there has been a change in weld­ing joints;
  • there is a gas leak accord­ing to meter read­ings.

Repair of gas pipes

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Repair of struc­tures involves their replace­ment: par­tial­ly or com­plete­ly. Com­plete replace­ment is car­ried out by mobile teams, they remove the dam­aged sec­tions of the main pas­sage to the com­mon house, then — if nec­es­sary.

Replac­ing a par­tial type in an apart­ment build­ing involves cut­ting sec­tions and plac­ing a new part using a weld­ed joint. These actions include com­pli­ance with safe­ty rules:

  1. The gas sup­ply is shut off.
  2. From the area that is being replaced, remove the remain­ing gas in accor­dance with the rules for the safe han­dling of haz­ardous objects.
  3. After trim­ming, a new sec­tion is weld­ed.
  4. Tests are being car­ried out to ana­lyze the integri­ty of the replaced sec­tion.
  5. The gas is start­ed after the nec­es­sary purge.

Replace­ment of gas equip­ment should not be done inde­pen­dent­ly. This is a com­plex and tech­ni­cal­ly dan­ger­ous process that spe­cial­ists are able to car­ry out. After the change, the infor­ma­tion is entered into a spe­cial tech­ni­cal pass­port, which will indi­cate the work, the occur­rence of nuances and dates.

Fig. 4 repair of the gas sup­ply sys­tem

In the pres­ence of a gas sup­ply sys­tem, con­sumers must fol­low the rules that help extend the life of struc­tures and pre­vent dif­fi­cult sit­u­a­tions:

  • time­ly inspec­tion and inspec­tion of gas pipes;
  • the cor­rect sequence of switch­ing on the equip­ment;
  • check­ing equip­ment if a gas leak is sus­pect­ed.

Min­i­mal doubts about the con­di­tion of gas equip­ment require the imme­di­ate call of util­i­ty ser­vice spe­cial­ists. When using domes­tic gas, it is pro­hib­it­ed:

  • tie up gas pipelines with ropes;
  • rein­stall the equip­ment your­self;
  • check for leaks with match­es or lighters;
  • bend or bunch the hoses that con­nect the sys­tem to the stove.

Com­pli­ance with the rules is nec­es­sary to avoid dan­ger­ous sit­u­a­tions.

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