Dimensions of asbestos-cement pipes - selection features and scope of application

Two types of pipes

An affordable option for asbestos-cement pipes is made from amphibole mineral. This material is bad for human health and can lead to malignant tumors in the respiratory tract. Therefore, it is practically not used anywhere. The chrysolite composition of pipes is considered less harmful. It is not so toxic, but is not completely broken down in the lungs.

All pressure and non-pressure drainage systems are equipped with asbestos-cement pipes. They are durable and resistant to high temperatures. The asbestos-cement composition prevents moisture from seeping through the pipe walls.

For the drainage system, it is necessary to select the correct diameter of asbestos-cement pipes, and also take into account the following:

Wall strength;
Pipe type for pressure or non-pressure system.

Pipe installation is carried out using rubber couplings or seals.

How to choose the right chimney?

This material is quite cheap, so it’s better not to look for even cheaper ones, since such pipes can crack during transportation. You need to buy pipes only from trusted places where they can provide quality guarantees.

What you need to do before purchasing:

It is necessary to inspect the pipes for cracks, chips and foreign inclusions.
Make sure that the pipe is level with uniform wall thickness.
Be sure to purchase asbestos cord to seal the joints.
Make sure that the cross-section of the pipe matches the diameter of the boiler pipe.

Typically, the diameter of asbestos pipes ranges from 10 to 50 cm, so choosing the right one for the boiler will not be so difficult. To reduce the number of joints in the chimney, a 5 meter pipe is usually used. If such a length would interfere with transportation, there are also 3 meter pipes.

To connect the asbestos pipe to the boiler pipe, it is recommended to use a special adapter or a stainless steel gas outlet pipe. Such a connection will ensure tightness.

Non-pressure pipe option

Non-pressure asbestos-cement pipes have a fairly wide range of applications:

Design of a non-pressure water supply system;
Sewerage installation;
Construction of waste chutes in multi-storey buildings;
Installation of chimneys and ventilation systems;
Construction of drainage canals;
Drainage systems, etc.

For agriculture, chrysotile cement pipes are used to construct irrigation and reclamation canals.

Asbestos-cement pipes - assortment

Asbestos-cement pipes and couplings are divided into pressure water pipes (GOST 539-59) and non-pressure sewer pipes (GOST 1839-48).

Water pipes, depending on their purpose, are divided into four brands:

VTZ - for a working hydraulic pressure of 3 atm

Table of contents items not found. Dimensions of water supply asbestos-cement pipes (in mm)

Table 127

conditional pass	Inner diameter		Outer diameter of machined ends			Pipe length	Reference pipe weight in kg				Coupling inner diameter		Reference weight of coupling in kg
conditional pass	VTZ,VT6, VT9	VT12	VT3	VT6	VT9 VT12	VTZ	VT6	BT9	VT12	VM3	BM6	VM3	BM6
50	50	–	68	68	68	–	11	11	11	–	79	79	1,2	1,2
75	75	—	93	93	93	2950	16	16	18	—	104	104	1.5	1,5
100	100	—	118	118	122	–	21	21	25	—	130,6	130,6	1,9	1,9
125	119	—	137	139	142	2950	24 33	26 35	31 41	48,5	149,6	151,6	2,1	2,3
150	141	135	161	163	168	3950	32 43	35 47	43 57	50 67	173,6	175,6	2,7	2,9
200	189	181	209	217	224	–	57	80	95	118	221,1	229,1	3,3	4,4
250	235	22 6	259	265	274	–	86	106	134	152	271,1	277,1	4,4	5,4
300	279	270	305	314	324	3950	142	146	188	218	317,1	326,1	5,0	6,8
350	322	012	352	361	373	–	145	184	238	278	366,2	375,2	7,3	9,1
400	368	356	4?’2	414	427	–	185	245	315	317,5	416,2	428,2	9,5	12,1
500	456	441	498	511	528	–	279	364	4ЪЪ	549	512,2	525,2	16,1	20,0

To connect VTZ and VT6 pipes, asbestos-cement couplings of the VMZ and VM6 brands are used, respectively; Cast iron couplings are used to connect pipes V G9 and VT12.

By agreement between the consumer and the plant, pipes of the VTZ and VT6 brands with a nominal bore of 600, 700, 800, 900 and 1000 mm with cylindrical asbestos-cement couplings for caulking can be manufactured according to the agreed technical specifications.

Table 128 - Dimensions of asbestos-cement sewer pipes (in mm)

Conditional pass	Inner diameter	Outer diameter and tolerances	Length and tolerances	Reference weight of one pipe in kg	Reference weight of one coupling in kg	Coupling inner diameter
100	100	116 +2-2,5	–	14,7	1,61	145
125	123	139 +2-2,5	2950 -50	18,5	1,87	171
150	147	165 +2-2,5	–	25,9	2,53	190
200	195	215 +2-2,5	–	51,0	3,30	245
250	243	265 +2-2,5	–	69,0	4,20	295
300	291	315 +2.5-3	–	90,2	5,30	345
350	338	364 +2.5-3	3925-50	113,8	6,45	390
400	386	414 +2.5-3	–	138,2	9,25	460
500	482	514 +2.5-3	–	196,0	12,60	550
600	576	612 +2.5-3	–	272,4	18,40	632

Asbestos-cement pipes and couplings are tested for the following hydraulic pressure:

VTZ pipes and VMZ couplings - 8 atm VT6. VM6-12, VT9-18, VT12-24.

Sewer regardless of diameter 4 atm.

In addition to their main purpose, water pipes can be used for oil pipelines, for district heating with an operating pressure of up to 5 atm at temperatures up to 80°, for gas pipelines with a gas pressure of no more than 5 atm and for sewerage.

Sewage pipes are used for internal and external free-flow sewage of fecal water, as well as for drainpipes, garbage chutes, ventilation ducts, chimneys and telephone pipelines.

The inner surface of pipes used for home sewage must be covered with a waterproof layer (bitumen, etc.).

Pipe sizes and characteristics

The length of pressure hollow pipes starts from 3.95 m and reaches 5 m. The cross-section of asbestos-cement pipes can be different, it all depends on the type of construction:

100-150 mm – ventilation systems and water supply;
200-250 mm – used for the construction of a network line;
300 mm is the optimal diameter for drainage systems;
400 mm – used in the construction of large water pipelines;
500 mm – used in production.

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Large diameter products are not produced because this is a technically complex process. There are certain GOST standards for asbestos-cement pipes that prevent low-quality products from entering the markets.

Advantages and disadvantages

Of course, like any other structure, asbestos products have their advantages and disadvantages. Some of the advantages include:

its low cost - the design is quite simple, you can quickly build it yourself;
Another small plus is that an asbestos chimney will be much lighter than a metal one.

At the same time, such a channel has a number of disadvantages. You should definitely pay attention to them, as this will help to correctly assess all the operating conditions of the chimney, and decide whether it is suitable at all. So:

The main disadvantage, which, by the way, is often forgotten, is the low output temperature. Such pipes are suitable only for low-power gas boilers. In no case should they be used to remove combustion products of solid fuel, because the temperature there is simply enormous, and this can lead to the destruction of the chimney or even a more serious accident.
Another drawback is that the material has no heat capacity, resulting in weak traction.
To avoid condensation, the pipe will have to be sufficiently well insulated at the junction with the roof.
When installing the structure, it is not possible to install inspection hatches, and this, in turn, threatens the appearance of soot, which will then be impossible to clean.
This type of pipe can only be installed vertically.
If the standards are violated, there is a high level of fire hazard.

Characteristics of pressure pipes

The main feature of pressure asbestos-cement products is their ability to withstand high water pressure. They can be used in the construction of heating mains, sewers, and water supply systems. They are also used in the ventilation system and in the construction of collectors.

Characteristic requirements for pressure pipes:

The quality of the product is determined by the conical ends of the pipes;
Mandatory tests for resistance to high pressure, the product must not allow water to pass through;
The kit must include mounting couplings.

Positive qualities of asbestos products

Despite the simplicity of the materials used, the pipes have not only a good margin of safety, but also the following qualities:

Frost-resistant properties;
Pipes are durable in use;
The hydraulic resistance is quite small;
The material is not destroyed by chemical exposure;
The product can withstand temperatures up to 300 degrees;
Pipe installation can take place in open ground;
Affordable prices for all types of products;
Asbestos pipes are not vulnerable to corrosion;
Relatively light weight;
The pipes are conveniently joined and connected by a coupling;
Manufactured in different sizes.

Installation

Before starting work, measurements are taken, diagrams and calculations of building materials are drawn up. It should be taken into account that ASB sections can only be installed on low-power devices. If a coal furnace is being installed, then they can be attached to heat-resistant products where the exhaust temperature becomes below the maximum permissible.

To assemble a chimney from an asbestos pipe with your own hands, you will need:

purlins of the required section and length;
special tees for arranging an audit;
metal clamp for attaching the channel to the supporting structures of the building;
galvanized sheet;
roll insulation;
roulette;
Bulgarian;
level;
perforator;
screwdriver;
hammer;
metal scissors;
riveter;
marker.

Installation of the chimney is carried out according to the following method:

Attaching the adapter to the pipe (it is advisable to choose a product with smooth transitions). Assembling a support from bricks.
Installation of heat-resistant sections made of ceramic or metal. Fastening them to the walls with clamps.
Attaching the adapter coupling. Attaching a link made of asbestos cement.
Assembling the passage through the floor slab and roof. It is recommended to use a thin slab of lean concrete, which has low thermal conductivity.
Sealing joints between links.

The final stage is trimming the last run and installing an umbrella on it to protect it from debris and precipitation.