Powdery mildew in the lunar planting is the most serious hazard, so how to prevent powdery mildew in the planting of the rose? Next, Xiaobian will introduce you to the prevention and treatment of powdery mildew in the next month to help you better grow the rose.

Powdery mildew mainly harms the leaves, young shoots, flower buds and pedicels of the rose. After the young leaves are sick, the leaves shrink and curl into deformities, sometimes turning purple. Old leaves are susceptible, the leaves appear nearly round, watery chlorotic yellow spots, and when severely damaged, the leaves wither and fall off. The tender parts of the young shoots and peduncle are slightly enlarged, and the top is curved to the ground. After the flower bud is infested, it cannot be opened or deformed in flower shape, and the surface of the affected part is evenly covered with a white powder layer.

Control measures for powdery mildew in rose:

The application of nitrogen fertilizer should not be too much, and the amount of calcium and potassium fertilizer should be increased appropriately to make the plant grow stronger and enhance disease resistance.

Before germination, spray the tree to the generals to prevent virus replication and infection, prevent and cure various cortical diseases such as rot and ulcer, as well as anti-frost and anti-freeze effects.

At the beginning of the disease, a new high-fat film is sprayed with a targeted fungicide to prevent and control the effect.

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,( 1514268,b) fixed ± 500 m,( 1514269,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.

Boiler Tube

Boiler Tube,High Pressure Boiler Tube,Stainless Steel Boiler Tube

YUHONG GROUP CO.,LIMITED , https://www.jessro-pipefittings.com