Sleeve axis tilt
Expansion glands quenched deformation temperature steam and water pipes with the water t ° to 200 ° C, and steam up to 300 ° C and operating pressure up to 2.5 MPa (25 kgf / cm 2), used in the construction of heating systems where the outdoor temperature of air not less than -40 ° C. Their big advantage is considered compensating capacity in a number of similar devices.
Compensators stuffed stuffing are almost to the very first type of compensation devices have been used in pipelines. Sleeve joints are installed on steam heating networks and water mains, with a pressure of 1.6 — 2.5 MPa, water at t ° up to 300 ° C and at t ° steam to 300 ° C. Sleeve joints are used for installation of heating pipe under the ground and above-ground laying on low supports. Sleeve joints have the ability to compensate for large linear and angular movements.
Construction of expansion glands
This type of expansion joint — a nested steel pipes of diameter close. smaller diameter pipe is inserted into the pipe more, and the difference between them is filled with stuffing box. On the outer side of the device are attached, which restrict the movement of the inner tube to prevent it from falling out.
By design features gland compensators are:
— Unilateral (nominal diameter of 100−1400 mm), which consist of a rolling cup and the housing;
— Bilateral (nominal diameter 100−800 mm), which have two moveable glass and an elongated body.
Sleeve joints have high compensating capacity, small dimensions and low hydraulic resistance. Thanks to the free movement of the pipes relative to each other, they are able to absorb the change in length of the pipeline temperatures drops. Because of their small size they are simply placed in the flow channels and chambers. To carry out regular maintenance of data compensators (stitched, change the stuffing box), they placed cells branching pipelines or compensatory heating chambers. Their preferred use on straight pipe sections with large diameters.
Use of expansion glands at high frequency compensating sizes and pressures inappropriate. Their scope is limited due to the complexity of the almost complete elimination of leakage of transported products. In this connection, these expansion joints are not used to transport corrosive, expensive or toxic products.
Sleeve joints made of steel or thick-walled pipes are welded from sheet steel in accordance with standard parts in accordance with a series of 4.903−10 release 7 or release of a series of 5.903−13 4. GOST 15 150−69 provides for the use of such compensators St3sp5 steel, St20, 09G2S. Unilateral designed for nominal width DN 100−1400 mm, and bilateral — on DN 100−800 mm. Compensating ability depends on nominal bore. For unilateral compensators it ranges from 200 to 500 mm, for bilateral from 200 to 1000 mm. For the stuffing box packing is used brands and APP PA (GOST 5152−77) and a heat-resistant rubber stamp 5168, a group of 8 (TUMHP number 1169−51r).
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