What are the classifications of marine pipe fittings? Fabrication of pipe fittings for ship pipeline

Marine pipe fittings are the parts that connect pipes into pipes. According to the connection method, it can be divided into four categories: socket pipe fittings, threaded pipe fittings, flange pipe fittings and welded pipe fittings. It is mostly made of the same material as the tube.

There are elbows (elbow tubes), flanges, tee pipes, crosses (cross heads) and reducer pipes (large and small heads), etc. The elbow is used where the pipe turns; The flange is used to connect the parts of the pipe with the pipe, which is connected to the pipe end; Tee is used where the three pipes converge; The crosses are used where the four pipes converge; Reducers are used where two pipes of different diameters are connected.

There are many types of marine pipe fittings, which are classified according to use, connection, and material.

1. The pipe fittings used for connecting pipes to each other are: flanges, union joints, pipe hoops, ferrules, hose hoops, etc.

2. Pipe fittings that change the direction of the pipe: elbow.

3. Pipe fittings that change the diameter of the pipe: change the diameter.

4. Increase the pipe fittings of the pipeline branch: tee and tee.

5. Pipe fittings for pipeline sealing: gaskets, raw meal belts 6, pipe fittings for pipeline fixing: snap rings, tow hooks, lifting rings, brackets, etc.

There are many types of marine pipe fittings, which can generally be divided into three categories according to the use, connection method, and material.

a) Classification by use.

The pipe fittings used for connecting pipes to each other are: rock flange, union joint, pipe hoop, ferrule, hose clamp, etc.

Fittings that change the direction of the pipe: elbows.

Pipe fittings that change the diameter of the pipe: reducer, reducer, reducer, reducer.

Pipe fittings with additional pipeline branches: tee, tee.

The pipe fittings used for pipeline sealing refer to Tanyu: gaskets, raw meal belts.

Pipe fittings for pipeline fixing: snap rings, tow hooks, lifting rings, brackets, etc.

2) Connection classification: 1Welded pipe fittings.

2.Threaded fittings.

3.Tube fittings.

4.clamp fittings, etc.

c) Classification by material: 1Cast steel pipe fittings, 2Cast iron pipe fittings, 3Stainless steel pipe fittings.

4.Plastic pipe fittings, pipe fittings, 6Rubber pipe fittings, 7Graphite fittings, 8Carbon steel pipe fittings, 9Copper letter song pipe fittings, 10Aluminum pipe fittings, etc.

It is used in the manufacture of seamless steel pipes for marine boilers and superheaters and pressure pipe systems.

It is the design and drawing of pipe fittings, which provides a basis for the production and installation of pipe fittings.

1. Software lofting: it is computer lofting. The ship pipeline lofting software installed by the computer is combined with the actual situation on the ship, such as hull, cabin and outfitting to design the ship pipeline, which has the advantages of accurate and fast lofting.

Nowadays, the commonly used software includes planar, three-dimensional, three-dimensional, 3D and so on.

2. Manual lofting: some pipe fittings that cannot be lofted by the computer or pipelines that are not lofed by the computer require the staff to make pipe fittings on site or measure the length and height difference of pipe fittings on site, and record them in the form of sketches and then make pipe fittings. There are two types: prefabricated and on-site.

1. Prefabrication: It is made in the workshop according to the drawings. Workers are required to be able to fully understand the various information expressed in the drawings, and to complete the pipe fitting production in strict accordance with the requirements and specifications of the shipowner and the relevant classification society.

2. On-site production: general equipment meeting and pipe fittings without lofting are made by workers on site, and the production requirements are horizontal and vertical, beautiful and generous, and the production process should protect the equipment mouth and the connected nozzle, and prohibit sundries from entering the equipment and pipelines. After the pipe fittings are made and polished, they are welded, and the welding should be carried out according to the requirements of the shipowner and classification society.

Generally, the angle is required to be 45°, no obvious welding nodules, welding scars, no pores, trachoma. Beautiful molding.

Surface treatment. Whether it is prefabricated in the workshop or made on site, the surface treatment must be carried out, and the treatment methods are divided into pickling, galvanizing, plastic coating, etc. according to the use and material of the pipe fittings. There are pipes that require stainless steel pipe fittings to be passivated.

China Classification Society Materials and Welding Specifications - China Classification Society (CCS) Det Norske Veritas (DNV) Specifications - Det Norske Veritas (DNV) Lloyd's Register (LR) Specifications - Lloyd's Register (LR) Specifications - German Lloyd's Register (GL) Specifications - American Bureau of Shipping (ABS) Specifications - American Bureau of Shipping (ABS) Specifications - French Bureau of Shipping (BV) Specifications - French Bureau of Shipping (BV) Reading.

Italian Classification Society (RINA) Specification - Italian Classification Society (RINA) Japanese Classification Society (NK) Specification - Japan Classification Society (NK) GB T5312 - Chinese National Standard.

Pipe fittings are the general term for the parts and components in the pipeline system that play the roles of connection, control, direction, diversion, sealing, and support. A fitting is a part that connects a pipe into a pipe.

The main ones are as follows:

1. The pipe fittings used for connecting pipes to each other are: flanges, union joints, pipe hoops, pipe hoops, pipe clamps, clamps, pipe hoops, etc.

2. Pipe fittings that change the direction of the pipe fiber wheel: elbow, elbow.

3. Pipe fittings that change the diameter of the pipe: variable diameter (reducer), reducer elbow, branch pipe table, and reinforcing pipe.

4. Increase the pipe fittings of the pipeline branch: tee and tee.

5. Pipe fittings for pipeline sealing: gaskets, raw meal belts, wire hemp, flange blind plates, pipe plugs, blind plates, sealing heads, welding plugs.

6. Pipe fittings for pipeline fixing: snap rings, tow hooks, lifting rings, brackets, brackets, pipe clamps, etc.

There are two main systems of international pipe flange standards, namely the European pipe flange system represented by the German DIN (including the former Soviet Union) and the American pipe flange system represented by the American ANSI pipe flange. In addition, there are Japanese JIS pipe flanges, but they are generally only used for public works in petrochemical plants, and they have less influence in the national search. The flanges of various countries are now briefly introduced below

1. The European system represented by Germany and the former Soviet Union is flanged.

2. The American system pipe flange standard, represented by ANSI and ANSI B.

3. The British and French pipe flange standards, each country has two sets of pipe flange standards.