The function of several plant-derived pesticides :
Boiler Tube Boiler Tube,High Pressure Boiler Tube,Stainless Steel Boiler Tube YUHONG GROUP CO.,LIMITED , http://www.alloypipeline.com
1. Tobacco. Ink 1 kg of tobacco into 10 kg of hot water, remove it and put it in another 10 kg of water. Combine two mashes, mix with 10 kg of lime water (containing 0.5 kg of lime) and spray to prevent mites, thrips, mites and so on.
2, anisidine. Spray with 0.65% water agent 450 to 700 times to control aphids and mites.
3, Green Baowei. Spray with 0.5% emulsifiable concentrate 1000-2000 times to control leaf-eating caterpillars.
4, bitter vine. It is very effective to control the leaf caterpillars with the extract.
5, chili water. 50 grams of chili powder with 1 kg of water, boiled for 10 minutes, then cooled and filtered, sprayed to control aphids.
6, grass and ash. 1 part of the ash was soaked in 5 parts of water for 24 hours, filtered and sprayed to control aphids.
7, 9281. Also known as Green Tree Medicine, Funi, is made from Chinese and Western medicine and biological fluid. Apply 4 to 5 times solution after scribing on the sickness to treat the rot of the grass fruit tree.
Boiler Tube - for pressure equipment, used at higher temperatures
Standards and steel grades,
Tube sizes acc. to EN, DIN, BS, NF A, UNI, STN, ÄŒSN and PN-H standards,
Tube sizes acc. to GOST and TU standards,
Tube sizes acc. to ANSI standards,
Tube sizes acc. to ASME standards,
Precision tube sizes.
Boiler tube is made from heat resisting carbon and low alloyed steels which can withstand the load at high pressure and temperature. Boiler tube is used for parts of energy type equipment such as boilers, steam superheaters, steam pipelines, etc. The tubes are supplied as hot rolled or cold drawn. Specifications, dimensions and the steel grades are shown in a separate overview.
Boiler tube dimensions and tolerances
The tube dimensions range from 10.2 mm to 139.7 mm, from 26.9 mm diameter and the wall thickness from 2.6 mm and they supplied as hot rolled. The smaller diameter tubes and the thick wall tubes of larger diameters are supplied as cold drawn and subsequently they are heat treated. The tubes delivery in this condition happens only if there is an agreement upfront at the time of ordering the tubes. Based on an agreement it is possible to deliver boiler tubes with dimensions and tolerances according to the dimensional specifications for precision tubes. The tube dimensions meet the requirements of the following EN 10216-2, DIN 2448, BS 3059-1, BS 3059-2, BS 3602-1, BS 3604-1, NF A 49-211, NF A 49-213, UNI 4991, STN 42 5715, STN 42 5716, ÄŒSN 425715, ÄŒSN 42 5716, GOST 8732, PN-H 74252, ANSI B36.10, ASME B36.10. The detailed dimensional overview is shown in the tables according to EN, DIN, BS, NF A, UNI, STN, ÄŒSN and PN-H standards, GOST standards, TU standards, ANSI standards, ASME standards and standards for precision tubes.
Length of the boiler tube
Diameter (OD) [mm] Wall (WT) [mm] Length (L) [m]
OD < 60,3 5 – 6
OD => 60,3 WT < 7,1 5 – 6 or 10 – 14 after an agreement 22,4
WT => 7,1 5 – 6
Types of the length of supplied tubes: (a) random, (b) fixed ± 500 m, (c) exact + 15 / - 0 mm.
Boiler tube straightness
Straightness deviation for the whole length of a tube 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 boiler tubes
The ends of the tubes are vertical to the longitudinal axis and are without burrs.
Condition of the tubes surface
The tubes condition corresponds to the requirements of appropriate standards, heat treatment to the way of tube manufacturing and chemical composition of steel.
Marking of the tubes and tube bundles
The tubes with the outside diameter up to 51 mm are marked with a label that is attached to the bundle. Larger tubes are marked at least at a one end of a tube by the necessary data.
Surface protection of the boiler tubes
While ordering, it is necessary to agree upon the way and means of temporary protecting the surface of the tubes during transportation and storing. The tubes may be supplied without temporary preservation of the surface, or with the preservation of the surface with an agreed upon preservative.
Packaging of the boiler tubes
The tubes are supplied in packages with a circular or hexagonal diameter with weight of 300 to 3500 kilograms. The tubes are bound with a steel band. It is possible to arrange wrapping to plastic sheet, burlap or to wooden crates.
