Anhui Tiankang Shares Co., Ltd.  (AHTKS)

Standards and steel grades,

DIN 28180,ASTM A179,BS, NF A, UNI, STN, ?SN, GOST standards, 

EN 10216, JIS. 

Heat exchanger tubes are made using the cold rolling process and the semi-finished product for these are used rolled steel tubes. Heat exchanger tubes are used in energy and chemical industry for heating the buildings, water etc. The heat exchanger tubes make it possible to transfer thermal energy from one media to another. The heat transfer may be linked with phase transformation of the media. Overview of the dimensional standards and the technical-delivery conditions according to which these tubes are manufactured and supplied is shown in a separate overview.

Dimensions of the heat exchanger tube

The outside diameter of the heat exchanger tubes ranges from 16 mm to 51 mm according to DIN 28180 and from ? inch (12.7 mm) to 3 inches (76.2 mm) according to ASTM A179 The tubes for the heat exchangers may be supplied also in compliance with other standards starting with 4 mm. Detailed overview is shown in tables and according to BS, NF A, UNI, STN, ?SN, GOST standards, according to EN 10216 and according to JIS standards. 

Delivery condition and tubes surface of the heat exchanger tube

Tubes are supplied according to agreed standards. The cold drawn tubes after the final forming go through thermal processing in shielding gas –normalizing.

Tubes length destined of the heat exchanger tube

Upon request the heat exchanger tubes may be supplied in length up to 18.3 meters.

Straightness of heat exchanger tube

Straightness deviation for the whole length of a tube L can not exceed value of 0.0015 x L. In conversion to the 1 meter length it can not exceed 3 mm. 

Ends of the heat exchanger tube

The ends of the tubes are vertical to the longitudinal axis and are without burrs.

Marking of the tubes and tube bundles

Tubes are marked by spraying the agreed upon data. Tube bundles are marked with labels with the agreed upon data.

Surface protection of the heat exchanger tube

The inner and outer surface is protected by a light oil application. Upon request it may be protected with and easy removable oil application on the outer side. The tube ends may be enclosed by a plastic plug.

Packaging of the heat exchanger tubes

The tubes are usually packaged into bundles of a hexagonal cross-section and are bound with a steel band that has a paper underneath. The package is wrapped with a plastic sheet. Upon request the tubes may be supplied in wooden crates.

Testing of the heat exchanger tube

Besides the prescribed mechanical tests, each tube is tested with leak tightness test by eddy current. Based on an agreement it is possible to do the hydrostatic testing or ultrasound testing.