JPS603357Y2 - Protection tube for vertical shaft pump - Google Patents

Description

[Detailed explanation of the idea] In offshore towers used for oil extraction, etc., a long chamber shaft pump that reaches below the sea surface is installed on the deck to pump up seawater for cooling and fire extinguishing purposes.

A steel protection tube was installed to protect the pump from the effects of currents and waves, but there were some difficulties in its construction.

This will be explained with reference to FIG. 1 is the leg of the offshore turret, and 2 is the deck on which pumps, compressors, generators, and other equipment are installed.

3 is a lower protection cylinder which is supported by the leg 1 via supporting members 5 and 6.

4 is an upper protection cylinder whose lower end is inserted into the upper end of the lower protection cylinder 3, and whose upper end is attached to the deck 2 via a support member 7.

A pump 20 is installed on the deck 2 by an installation stand 8.

9 is a motor, and 10 is a lift pipe of a pump 20, which has a rotating shaft therein.

11 is a vane of the pump 20, 12 is a suction strainer, 1
Reference numeral 3 designates guide rollers used when lifting and lowering the pump 20 for assembly, disassembly, etc.

Offshore turrets are installed on the seabed using leg 1, but it is difficult to install them accurately due to the uneven topography of the seabed, so leg 1
It will be installed tilted as shown by the dotted line in the figure.

In that case, if deck 2 is tilted, it is a problem, so the arrangement diagram V'
d” to make the deck 2 horizontal.

However, since the lower protection tube 3 is supported by the legs 1, it remains tilted as shown by the dotted line), so when the pump 20 is installed on the deck 2, the tip of the pump 20 hits the lower protection tube 3, causing strange vibrations. There is a problem that causes

In addition, a is the reference sea level, b is the crest of the highest wave at high water level, and C
indicates the base of the wave at low water level.

In this case, if the diameter of the protective tube 3 is increased so that the pump 20 does not hit even if the offshore turret is installed in a similar manner,
It would be uneconomical to increase the thickness of the protective tube 3 or to make the supporting members 5 and 6 stronger in terms of strength against waves and currents.

Therefore, the protection tube 3 was constructed according to the following procedure without increasing its diameter.

The upper protection tube 4 is positioned according to the position of the lower protection tube 3, and the support material 7 is welded to the deck 2 on site.

The position of the pump installation stand 8 is also determined on-site and attached to the deck 2 by welding.

For this reason, the location of the installation of the pump 20 cannot be determined unless it is done on-site, so the discharge piping from the pump 20 is also constructed on-site.

As mentioned above, there was a problem in that the amount of on-site construction work increased significantly.

The present invention aims to solve the above-mentioned problems and includes a protective tube that surrounds a chamber shaft type pump installed on the deck of an offshore turret and protects it from water flow, by adding a portion opposite to the tip of the pump. This invention provides a protective cylinder for a chamber shaft type pump that is characterized by a structure that is thicker than other parts.

That is, the protective tube of the chamber shaft pump according to the present invention surrounds the tip of the chamber shaft pump, and only the lower end facing the tip is partially thickened.

This has the effect that the chamber shaft type pump can be installed on the deck of an offshore turret extremely easily and quickly without substantially increasing the pressure receiving area of the water flow as a whole of the protection tube.

One embodiment of the present invention is shown in FIG. 2, and includes a portion of a protective tube that surrounds and faces an optical axis section formed by a blade section 11, a suction strainer 12, a guide roller 13, etc. of a chamber shaft type pump. That is, the lower end portion 14 of the lower protection tube 3 is made thicker than most of the other portion surrounding the water pump 10.

In this way, even if the protection tube is tilted as a result of the offshore turret being installed at an angle, the pump 20 will not hit the protection tube as shown by the dotted line in the figure.

Therefore, when installing the pump on the offshore turret, on-site construction work is extremely reduced and the installation can be done extremely easily and quickly.

Furthermore, since the diameter of the protection tube is only partially increased without increasing the diameter of the protection tube as a whole, the pressure-receiving area of the water flow does not increase significantly, so that the protection tube and its support material can be manufactured at low cost without needing to be strengthened.

[Brief explanation of the drawing]

FIG. 1 is a side view showing how to install a chamber shaft type pump in a conventional offshore turret, and FIG. 2 is a partial sectional view showing an embodiment of the present invention. Detsuki...2, Chamber shaft type pump...20
, Protective cylinder...3, Blade part...11, Suction strainer...12, Guide roller...
・・13゜

Claims (1)

[Scope of utility model registration request] A protective cylinder for enclosing a chamber-shaft type bong installed on the deck of an offshore turret and protecting it from water flow, characterized in that the part facing the tip of the pump is thicker than the other parts. Protective tube for type pump.