Choosing ribbed registers, radiators and heating pipes


Heat­ing pipes with ribs have been used for many decades and have not lost their rel­e­vance to this day. This equip­ment has its own design fea­tures that deter­mine the use, there­fore, they are rarely found in heat­ing sys­tems for pri­vate hous­ing, but they are wide­ly used for heat­ing indus­tri­al premis­es. A pho­to of finned heat­ing pipes will tell you what equip­ment we are talk­ing about, after which we will con­sid­er the char­ac­ter­is­tics of this prod­uct in more detail.

The device of ribbed heating pipes

Pipe mate­r­i­al in heat­ing sys­tems is used not only for the instal­la­tion of heat­ing pipelines, but also as radi­a­tors. To increase the effi­cien­cy of such a sys­tem, a sec­tion of a pipe of a larg­er diam­e­ter or a fig­ured design (coil) cuts into the heat­ing cir­cuit, which increas­es the heat trans­fer area.

Lat­er, anoth­er method began to be used — the finning of pipeline sec­tions that act as radi­a­tors.

Thus, ribbed heat­ing pipes are a pipe frag­ment of a cer­tain length (car­ri­er pipe) with trans­verse (less often — lon­gi­tu­di­nal) out­er ribs locat­ed at a cer­tain step. The finned ele­ment of the pipeline is equipped with inlet and out­let pipes for con­nec­tion to the heat­ing sys­tem. The branch pipes of such a radi­a­tor can be thread­ed, smooth (weld­ed) or flanged.

One such prod­uct, ready for inser­tion into the heat­ing cir­cuit, is called a sin­gle-sec­tion reg­is­ter. If sev­er­al sin­gle-sec­tion reg­is­ters are mount­ed in rows locat­ed in one or two planes, a mul­ti-sec­tion reg­is­ter will be obtained — a design that fur­ther increas­es the inten­si­ty of heat­ing.

Depend­ing on the mate­r­i­al of exe­cu­tion, finning is per­formed in dif­fer­ent ways, but the pur­pose of this oper­a­tion is the same — to improve heat trans­fer between the heat­ing pipeline and the envi­ron­ment by increas­ing the area of ​​u200bu200btheir con­tact.

Types of finned tubes

Ribbed heat­ing pipe ele­ments are made of the fol­low­ing met­als:

  • cast iron (with addi­tives of mag­ne­sium and ceri­um);
  • steel;
  • stain­less steel;
  • cop­per;
  • brass;
  • alu­minum.

Accord­ing to the struc­tur­al struc­ture, finned tubes are divid­ed into:

  • monometal­lic — sol­id prod­ucts obtained by cast­ing or turn­ing from a work­piece;
  • bimetal­lic — prod­ucts assem­bled from pipes and ribs.

Monometal­lic prod­ucts include cast iron finned tubes, which are man­u­fac­tured by cast­ing and must meet the require­ments of GOST 1816–76, as well as cop­per and alu­minum prod­ucts, on which fins are formed by extrusion/rolling on a machine.

A bimetal­lic prod­uct is an inter­nal car­ri­er pipe made of stain­less steel or brass, on which lon­gi­tu­di­nal or trans­verse cop­per or alu­minum fins are locat­ed.

Finning of bimetal­lic pipes is car­ried out by the fol­low­ing meth­ods:

  • knurl­ing — an alu­minum or cop­per sleeve is put on the car­ri­er pipe, on which ribs are squeezed out by rolling;
  • spi­ral heli­cal wind­ing — a met­al tape is pressed into the out­er sur­face of the car­ri­er pipe dur­ing spi­ral wind­ing;
  • spi­ral-heli­cal high-fre­quen­cy cur­rent — fas­ten­ing the tape to the car­ri­er pipe by weld­ing the con­tact sur­faces after they are heat­ed by high-fre­quen­cy cur­rent;
  • lon­gi­tu­di­nal (axi­al) finning — con­nec­tion of the tape with the car­ri­er pipe by one of the types of weld­ing.

In the man­u­fac­ture of bimetal­lic tube reg­is­ters for heat exchang­ers, the lay­out of mate­ri­als can be as fol­lows (car­ri­er tube + fins):

  • steel + alu­minum;
  • alu­minum + alu­minum;
  • brass + alu­minum

Specifications of Cast Iron Ribbed Tubes


Cast iron is a strong and durable met­al with high ther­mal con­duc­tiv­i­ty, there­fore cast iron finned tubes are the most com­mon in heat­ing sys­tems, which are char­ac­ter­ized by the fol­low­ing para­me­ters:

  • inner diam­e­ter — from 32 to 70.0 mm;
  • out­er diam­e­ter (with ribs) — 175.0 mm;
  • oper­at­ing tem­per­a­ture of oper­a­tion — up to 90 degrees. (short-term expo­sure up to 150 degrees),
  • work­ing pres­sure of the coolant in the sys­tem — 1.0 MPa;
  • the length of indi­vid­ual ele­ments is from 0.5 to 6.0 m.

The shape of the ribs can be round or rec­tan­gu­lar. The rec­tan­gu­lar for­mat of finned heat­ing tubes is more effi­cient due to the larg­er heat trans­fer sur­face area.

The use of pipe products of ribbed design made of cast iron

Due to their con­sid­er­able weight and low lev­el of aes­thet­ics, cast iron finned radi­a­tors are main­ly used for steam or water heat­ing of pro­duc­tion work­shops, ware­hous­es, live­stock com­plex­es and oth­er objects of large areas. At the same time, the sin­gle use of such equip­ment is inef­fi­cient, and the ele­ments are installed in sec­tions of sev­er­al radi­a­tors. Such heat­ing reg­is­ters made of ribbed tubes increase the inten­si­ty of space heat­ing by sev­er­al times, but at the same time require a large area for instal­la­tion.

These devices are also suit­able for heat­ing hous­ing, but they will require addi­tion­al fin­ish­ing in the form of dec­o­ra­tive cas­ings or false walls.

The high tech­ni­cal char­ac­ter­is­tics of cast iron deter­mine the wide­spread use of cast iron finned tubes in econ­o­miz­ers — gas­es and aggres­sive sub­stances do not cause cor­ro­sion of the heat exchang­er mate­r­i­al when pass­ing through them.

Installation of cast iron finned tubes


Due to the sig­nif­i­cant weight, ribbed heat­ing reg­is­ters place increased demands on the base. The bear­ing capac­i­ty of the walls (for wall-mount­ed radi­a­tors) and the strength of the brack­ets must be high, and the attach­ment of the fas­ten­ers to the base must be reli­able. When the unit is installed on the floor, sup­ports, stan­dard or self-man­u­fac­tured, must be weld­ed at the bot­tom of it. If the floor is wood­en floor­ing, then slots are made in it so that the radi­a­tor sup­ports are locat­ed on the sup­port­ing floor slab.

Before instal­la­tion, the finned radi­a­tor is cleaned of old paint and dirt, degreased, and then primed and paint­ed. It is bet­ter to paint with an air­brush, because due to the con­fig­u­ra­tion of the reg­is­ter, the paint­ing area is large, and the fins are poor­ly acces­si­ble for brush work.

A solu­tion of mini­um iron in dry­ing oil is suit­able as a primer, and a top coat is a heat-resis­tant paint (enam­el) of a suit­able col­or or a solu­tion of alu­minum pow­der. The paint­ed reg­is­ter should not be under direct sun­light — the paint will flow.

Impor­tant! The finned radi­a­tor is installed so that from the floor to the lon­gi­tu­di­nal axis of its low­er reg­is­ter is at least 20 cm, and from the side sur­face to the wall — at least 15 cm.

After the paint has dried, the paint­ed radi­a­tor is installed in place, after which the device is addi­tion­al­ly fixed to the wall in order to avoid acci­den­tal tip­ping over dur­ing mechan­i­cal action.

Con­nec­tion to the heat­ing cir­cuit is made after the final instal­la­tion of the unit, so that its dis­place­ment does not vio­late the tight­ness of the con­nec­tions. Inser­tion is made depend­ing on exe­cu­tion of branch pipes of the reg­is­ter — flange con­nec­tion, on a carv­ing or weld­ing. When flanged, it is rec­om­mend­ed to use paronite as a gas­ket mate­r­i­al, cut to the dimen­sions of the flange mir­rors (mir­rors are cleaned of paint with fine sand­pa­per), or use stan­dard gas­kets, if they are pro­vid­ed in the pack­age.

After the final instal­la­tion of the unit, dot paint­ing of areas dam­aged dur­ing instal­la­tion is car­ried out.

Advantages and disadvantages of finned tubes


It is thanks to a num­ber of advan­tages that cast iron finned heat­ing pipes are used in heat­ing sys­tems to this day, we list these fac­tors:

  • body tight­ness;
  • large heat trans­fer area;
  • neu­tral­i­ty to any kind of cor­ro­sion;
  • high ther­mal con­duc­tiv­i­ty;
  • strength;
  • dura­bil­i­ty (100 years is not the lim­it);
  • afford­able cost.

But there are also dis­ad­van­tages:

  • sig­nif­i­cant weight;
  • low impact resis­tance;
  • the dif­fi­cul­ty of keep­ing clean (accu­mu­la­tion of dust in the fins, poor acces­si­bil­i­ty of the paint­ing area);
  • bulk­i­ness.


In terms of its func­tion­al­i­ty, a cast iron ribbed heat­ing radi­a­tor is the best option for com­plet­ing a heat­ing sys­tem for util­i­ty and util­i­ty rooms — the lack of aes­thet­ics is com­pen­sat­ed by dura­bil­i­ty, reli­a­bil­i­ty and afford­able cost, since the dif­fi­cul­ty fac­tor of paint­ing in a util­i­ty room fades into the back­ground.

The main essence of the arti­cle

  1. Ribbed cast iron heat­ing reg­is­ters are a mate­r­i­al that has not become obso­lete.
  2. The appro­pri­ate­ness of using ribbed heat­ing pipes depends on the choice of the place of oper­a­tion.
  3. The cor­rect instal­la­tion is one of the fac­tors for the effi­cien­cy of the reg­is­ter.
  4. Know­ing the char­ac­ter­is­tics of the radi­a­tor helps ensure longevi­ty.


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