CN111336349B

CN111336349B - Base for supporting seawater lift pump and processing method thereof

Info

Publication number: CN111336349B
Application number: CN202010173777.3A
Authority: CN
Inventors: 冯剑坤; 郑兴峰; 龚诗; 李智勇
Original assignee: Shanghai Waigaoqiao Shipbuilding Co Ltd
Current assignee: Shanghai Waigaoqiao Shipbuilding Co Ltd
Priority date: 2020-03-13
Filing date: 2020-03-13
Publication date: 2022-02-01
Anticipated expiration: 2040-03-13
Also published as: CN111336349A

Abstract

The invention discloses a base for supporting a seawater lifting pump and a processing method thereof. The base includes: the pipe body is provided with a first end and a second end along the axial direction, the first end and the second end are provided with openings, and a containing cavity is formed inside the pipe body; the support ring is arranged on the inner wall surface of the pipe body at the second end and is superposed with the central axis of the pipe body; and the limiting parts are arranged on the inner wall surface of the second end in the pipe body and are arranged at intervals along the circumferential direction, and are used for limiting the movement of the seawater lifting pump along the circumferential direction, the radial direction and the axial direction of the pipe body. The processing method comprises the following steps: rolling a plate for manufacturing the pipe body to form a preformed pipe body; hoisting the preformed pipe body to a jig frame, and welding a splicing seam on the preformed pipe body to form a pipe body; and installing the support ring and the limiting parts on the pipe body. The base can reliably support the seawater lift pump.

Description

Base for supporting seawater lift pump and processing method thereof

Technical Field

The invention relates to the field of ships, in particular to a base for supporting a seawater lift pump and a processing method thereof.

Background

Nowadays, countries in the world are concerned more and more about energy sources, and the demand is increasing every day. Today, land-only energy is far from meeting the needs of development, and many countries focus their attention on energy treasuries, which account for 70% of the total area of the world, that have not been exploited in large quantities.

The world countries pay more and more attention to the abundant petroleum resources in the ocean, and many countries tighten up the development and utilization of the offshore petroleum, so that a series of facilities for exploitation and utilization of the offshore petroleum are developed. Floating Production Storage and Offloading (FPSO) is also increasingly demanded as a current advanced deep sea oil Production processing platform, and requires a large amount of seawater in Production and living facilities, and provides cooling water and Production water for power systems, air conditioning systems and Production equipment. Therefore, the seawater lift pump is an indispensable component of the FPSO, and since the seawater lift pump needs to work in a seawater environment for a long time, a base for supporting the seawater lift pump is needed to ensure stable work and prolong the service life of the seawater lift pump.

In the prior art, a base of a seawater lift pump suitable for an FPSO of 30 ten thousand tons is not available, and a processing method suitable for the base is not available.

Disclosure of Invention

The technical problem to be solved by the present invention is to overcome the above-mentioned defects in the prior art, and to provide a base for supporting a seawater lift pump and a method for processing the same.

The invention solves the technical problems through the following technical scheme:

a pedestal for supporting a seawater lift pump, comprising:

the seawater lifting pump comprises a pipe body, a first end and a second end are arranged along the axial direction, the first end and the second end are both provided with openings, and a containing cavity for containing the seawater lifting pump is arranged inside the pipe body;

the support ring is arranged on the inner wall surface of the pipe body at the second end and is superposed with the central axis of the pipe body;

the limiting pieces are arranged on the inner wall surface of the second end in the pipe body and are arranged at intervals in the circumferential direction, and the limiting pieces are used for limiting the movement of the seawater lift pump in the circumferential direction, the radial direction and the axial direction of the pipe body.

In this scheme, the body can overlap at the tip of sea water elevator pump, and it can the holding body to hold the chamber, and the support ring supports the tip of sea water elevator pump, the quantity and the structure looks adaptation of the tip of structure and sea water elevator pump of locating part. The base can reliably support the seawater lift pump. Wherein, the locating part can also play the additional strengthening to the body except can playing limiting displacement to the sea water elevator pump.

Preferably, a clamping groove is formed in the middle of each limiting member, and the support ring is clamped in the plurality of clamping grooves.

In the scheme, the limiting piece is clamped on the support ring, so that on one hand, the occupied space can be reduced; on the other hand, the locating part can play the additional strengthening to the support ring, is favorable to improving the reliability to the sea water elevator pump supports.

Preferably, the base further includes a guide rib, the guide rib is disposed on an inner wall surface of the pipe body, and the guide rib extends along an axial direction of the pipe body.

In this scheme, the direction muscle is used for leading to the sea water elevator pump, is favorable to improving the support reliability to the sea water elevator pump.

Preferably, the base further includes an anti-wear ring, and the anti-wear ring is disposed on an inner wall surface of the tube body at the first end;

the anti-abrasion ring is provided with an accommodating opening, and the accommodating opening is used for clamping the guide rib.

In this scheme, the body can be protected to the abrasionproof ring, reduces or avoids the wearing and tearing to the body, is favorable to further improving the support reliability to the sea water elevator pump.

Preferably, the limiting member and the wear-resistant ring are made of dual-phase stainless steel.

Preferably, the base further includes a reinforcement ring, the reinforcement ring is located at the first end, and the reinforcement ring is sleeved on the outer wall surface of the tube body.

Preferably, the wall thickness of the pipe body is 60mm, and the diameter of the pipe body is 2020 mm;

the material of body is EH36 steel.

The invention also provides a processing method of the pedestal for supporting the seawater lift pump, which is characterized by comprising the following steps:

s1, rolling the plate for manufacturing the pipe body to form a preformed pipe body;

s2, hoisting the preformed pipe body onto a jig frame, and welding splicing seams formed by two ends of the plate on the preformed pipe body to form the pipe body;

s3, installing the support ring and the limiting pieces on the pipe body.

In this scheme, when the wall thickness of body is thick, if adopt two steel sheets to weld the shaping through the butt joint behind the bent plate processing, can produce a large amount of uncontrollable heat distortion during then two formula welding to lead to the difficult control of precision of body. And through carrying out the crimping to a panel and welding again, be favorable to improving the precision of body.

Preferably, step S1 includes the following steps:

s11, respectively pre-pressing two ends of the plate before coiling, wherein the two ends of the plate are pre-pressed at least three times;

s12, after the 1/3 of the circumference of the tube body is rolled and pressed from one end of the plate material, the 1/3 of the circumference of the tube body is rolled and pressed from the other end of the plate material;

and S13, completing the rolling of 1/3 of the circumference of the rest of the pipe body.

In this scheme, the both ends pre-compaction to panel is favorable to reducing the elasticity of panel, is favorable to improving the efficiency of book pressure. In the pre-pressing, the pressure may be once applied to the end portion within a range of 150mm, and then may be applied twice within a range of 300 mm.

Preferably, in the process of performing steps S12 and S13, the processing method further includes the steps of:

and timely detecting the pipe body by using the inner arc radius sample plate so as to avoid the position deviation of the plate along the axis direction of the pipe body.

Preferably, step S2 includes the following steps:

s21, hoisting the preformed pipe body to a jig;

s22, mounting annular reinforcing plates at two ends of the preformed pipe body respectively;

and S23, welding the splicing seams.

Preferably, in the process of executing step S23, the processing method further includes the following steps:

measuring the inner diameter once every 45 degrees along the circumferential direction of the inner wall surface of the preformed pipe body so as to control the diameter deviation within +/-3 mm;

monitoring the roundness and the circumference to control the roundness deviation of the pipe body within +/-3 mm and the circumference deviation within +/-5 mm;

and monitoring the verticality of the upper end surface and the lower end surface of the pipe body and the horizontal plane so as to control the verticality deviation within +/-3 mm.

In this scheme, at the welded in-process, need in good time monitor diameter deviation, circularity deviation and straightness deviation etc. that hangs down, be favorable to improving the reliability of body processing.

Preferably, in step S23, the groove during welding is a double-sided X-shaped groove.

In this scheme, adopt two-sided X type groove to control the deformation more easily, be favorable to controlling the precision of body.

The positive progress effects of the invention are as follows:

according to the seawater lifting pump support base, the accommodating cavity in the pipe body can accommodate the seawater lifting pump, the support ring can support the seawater lifting pump, and the limiting part can limit the seawater lifting pump, so that the seawater lifting pump can be reliably supported by the base. The processing method of the base is beneficial to improving the processing precision.

Drawings

Fig. 1 is a schematic structural view of a base for supporting a seawater lift pump according to a preferred embodiment of the present invention.

Fig. 2 is a flow chart illustrating a method for manufacturing a base for supporting a seawater lift pump according to a preferred embodiment of the present invention.

Description of reference numerals:

10 pipe body

20 support ring

30 stopper

40 guide rib

50 wear ring

60 reinforcing ring

Detailed Description

The invention is further illustrated by the following examples, which are not intended to limit the scope of the invention.

The embodiment discloses a base for supporting a seawater lift pump, as shown in fig. 1, the base comprises a pipe 10, a supporting ring 20 and a plurality of stoppers 30. The pipe body 10 has a first end and a second end along the axial direction, the first end and the second end both have openings, and the inside of the pipe body 10 has a holding chamber for holding the seawater lift pump. The support ring 20 is arranged on the inner wall surface of the pipe body 10 at the second end, and the support ring 20 is overlapped with the central axis of the pipe body 10; the plurality of limiting members 30 are disposed on an inner wall surface of the pipe body 10 at the second end, and the plurality of limiting members 30 are disposed at intervals along the circumferential direction and are used for limiting the movement of the seawater lift pump along the circumferential direction, the radial direction and the axial direction of the pipe body 10.

In this embodiment, the pipe 10 can be sleeved on the end of the seawater lift pump, the accommodating cavity can accommodate the pipe 10, the supporting ring 20 supports the end of the seawater lift pump, and the number and structure of the limiting members 30 are adapted to the structure of the end of the seawater lift pump. The base can reliably support the seawater lift pump. Wherein, the locating part 30 can play limiting displacement to the seawater lift pump, can also play the reinforcing displacement to the body 10.

Further, each of the stoppers 30 has a locking groove (not shown) at the middle portion thereof, and the support ring 20 is locked in a plurality of the locking grooves. The limiting member 30 is clamped on the support ring 20, so that on one hand, the occupied space can be reduced; on the other hand, the limiting member 30 can strengthen the supporting ring 20, which is beneficial to improving the reliability of supporting the seawater lift pump.

Further, the base further includes a guide rib 40, the guide rib 40 is provided on an inner wall surface of the pipe body 10, and the guide rib 40 extends in an axial direction of the pipe body 10. Wherein, direction muscle 40 is used for leading to the sea water elevator pump, is favorable to improving the support reliability to the sea water elevator pump.

Further, the base further includes an anti-wear ring 50, and the anti-wear ring 50 is disposed on the inner wall surface of the tube 10 at the first end. The wear ring 50 has an accommodating opening for engaging the guide rib 40. The wear-resistant ring 50 can protect the pipe body 10, reduce or avoid the wear to the pipe body 10, and is favorable for further improving the supporting reliability of the seawater lift pump. The limiting member 30 and the wear-resistant ring 50 are made of dual-phase stainless steel. Specifically, the position-limiting member 30 needs to be machined to form a step, and then the duplex stainless steel is overlaid, and the wear-resistant ring 50 needs to be formed by overlaying, boring and grinding the duplex stainless steel.

Further, the base further includes a reinforcing ring 60, the reinforcing ring 60 is located at the first end, and the reinforcing ring 60 is sleeved on the outer wall surface of the pipe body 10.

In the present embodiment, the thickness of the pipe body 10 is 60mm, the diameter of the pipe body 10 is 2020mm, and the material of the pipe body 10 is EH36 steel.

The present embodiment also provides a method for processing the pedestal for supporting the seawater lift pump, as shown in fig. 2, the method includes the following steps:

step 101, rolling a plate for manufacturing a pipe body to form a preformed pipe body;

102, hoisting the preformed pipe body onto a jig frame, and welding a splicing seam formed by two ends of a plate on the preformed pipe body to form a pipe body;

step 103, installing the support ring and the plurality of limiting pieces on the pipe body.

It should be noted that, in step 103, only the support ring and the plurality of limiting members are limited to be mounted on the pipe body, and actually, the processing method further includes the following steps: install direction muscle, abrasionproof ring and beaded finish in the body.

Further, step 101 comprises the steps of:

step 11, respectively pre-pressing two ends of the plate before coiling, wherein the two ends of the plate are pre-pressed at least three times;

step 12, rolling 1/3 of the circumference of the pipe body from one end of the plate, and then rolling 1/3 of the circumference of the pipe body from the other end of the plate;

and step 13, completing the rolling of 1/3 on the circumference of the rest pipe body.

In this scheme, the both ends pre-compaction to panel is favorable to reducing the elasticity of panel, is favorable to improving the efficiency of book pressure. In the pre-pressing, the pressure may be once applied to the end portion within a range of 150mm, and then may be applied twice within a range of 300 mm. In addition, in the process of rolling, the pressure of the roller of the pipe rolling machine is gradually increased.

Further, in the process of performing step 12 and step 13, the processing method further includes the steps of:

the inner arc radius sample plate is timely used for detecting the pipe body, so that the plate is prevented from deviating in the axial direction of the pipe body.

Still further, step 102 includes the steps of:

step 21, hoisting the preformed pipe body to a jig frame;

step 22, mounting annular reinforcing plates at two ends of the preformed pipe body respectively;

and step 23, welding the splicing seam.

Wherein, at the in-process of hanging preforming body off the rolling machine, in order to avoid the body to be damaged by hoist cable or fixture, should use interim lug to carry out the handling.

Further, in the process of performing step 23, the processing method further includes the steps of:

In the welding process, diameter deviation, roundness deviation, verticality deviation and the like need to be monitored timely, and the reliability of pipe body processing is improved.

In step 23, the groove during welding is a double-sided X-shaped groove. The deformation of the double-sided X-shaped groove is easy to control, and the precision of the pipe body is favorably controlled.

In addition, in order to align the base with other upper pipe bodies, cross-shaped punching points need to be knocked out at positions corresponding to the openings at the two ends on the outer wall of the pipe body in the process of forming the pipe body, and the cross-shaped punching points at the two ends need to be aligned.

The pipe body and a seawater transportation pipeline (the wall thickness is about 20 mm) on the upper part are provided with a wall thickness difference pipe, transition bevels and grooves exist, the grooves on the periphery are required to be repaired and cut theoretically when a steel plate is blanked before machining, after analysis, if the transition bevels and the grooves on the upper end and the lower end of the pipe body are removed after blanking, the transition bevels cannot bear force when rolling circles during plate rolling machining, so that the pipe diameters of the upper end and the lower end of the pipe body are expanded to be large after machining, and in order to ensure the requirements of the roundness and the pipe diameter precision of pipe body machining, the transition bevels and the groove repairing and cutting sequence need to be modified according to corresponding specifications.

The precision control of the pipe body is started from the control of the length and width of a plate when the plate is cut and fed from a steel plate, the processing radius of the plate is controlled by the processing of a rolling plate, the roundness and the straightness are corrected by an initiating fire, and finally the welding deformation is controlled by adjusting the welding voltage and the welding current after the cutting allowance is repaired until the pipe body is welded and formed. Wherein, control about the girth of body: the length of enclosing of measuring body after the body is preliminary machine-shaping (form preforming body), because the body can produce welding shrinkage when the mouth welding of healing up, consequently need add when cutting off and enclose long surplus and put some welding allowances, surplus adding is put too much and can lead to the pipe diameter to be oversize, consequently reachs final surplus value after calculating repeatedly. Control of diameter and roundness of the pipe body: in order to obtain more accurate diameter data of the pipe body in the construction process, a micrometer is adopted to monitor the diameter of the pipe body in real time and record the diameter into a table; in order to reduce the deviation value of the external expansion of the upper end and the lower end of the tube body, the flame adjustment is carried out on the position with the deviation, the flame temperature is required to be not more than 600 ℃ due to the standard requirement, so that the adjustment needs to be carried out repeatedly for many times, and the diameter, the roundness and the like of the tube body are measured and data are recorded in the adjustment process.

Before welding the closed joint, the diameter, roundness, straightness and other data of the pipe body need to be measured again, after all the data meet the requirements, the internal support rods of the pipe body are added, and the pipe body is integrally fixed on the jig frame by using a clamping horse, so that the welding operation of the pipe body to the joint is carried out after the precision of the pipe body is not influenced.

Regarding the pre-welding requirements: before welding, whether a welding groove is smooth or not is checked, defects such as cracks, layering and slag inclusion are avoided, water, rust, oil stain and accumulated slag around the groove are cleaned, the wall thickness of a base tube body reaches 60mm, the tube body needs to be preheated during welding, the heating mode preferably adopts electric heating, and the preheating at least covers 75mm of two sides and the whole thickness direction before welding. The following requirements must be observed when a welding discontinuity occurs during the welding process: (1) during electric heating, welding interruption is not allowed before the back cover and the first layer are not finished; (2) when the welding line is not preheated, the welding line is allowed to be interrupted only when the thickness of the welding line is at least 10mm, and the welding line can be continuously welded only after QC (quality control) inspection; (3) the thickness of the welding seam is less than 10mm or the welding seam is defective after inspection, the welding seam must be completely removed, and welding is prepared again; (4) when the electric heater is not used, a temperature measuring pen, a contact type temperature measurer or a laser temperature measurer is needed to ensure that the temperature meets the requirement.

Regarding the requirements in the welding process: the welding is carried out by adopting a double-sided symmetrical welding mode, the welding temperature and current and voltage of each layer are strictly controlled in the whole welding process, the influence of the welding on the diameter data, the roundness and the straightness of the pipe body is timely monitored, and a recording table is manufactured for detailed data recording, so that the welding deformation is finally controlled in a reasonable range.

Regarding the requirements after welding: after the pipe body is welded, postweld heat treatment is required, and local and integral postweld heat treatment can be adopted. During the incubation with the thermocouples (at least three), the temperature of the structure should be recorded. A thermocouple controlled by a capacitor should be used in order to avoid damage to the surface of the structure. During the heat treatment, the temperature difference between the inner and outer surfaces of the heated region should not exceed 30 degrees. And measuring again after heat treatment to confirm whether the dimensions such as diameter, roundness, straightness and the like meet the requirement of pipe body precision.

While specific embodiments of the invention have been described above, it will be appreciated by those skilled in the art that this is by way of example only, and that the scope of the invention is defined by the appended claims. Various changes and modifications to these embodiments may be made by those skilled in the art without departing from the spirit and scope of the invention, and these changes and modifications are within the scope of the invention.

Claims

1. A pedestal for supporting a seawater lift pump, comprising:

the seawater lifting pump comprises a pipe body, a first end and a second end are arranged along the axial direction, the first end and the second end are both provided with openings, a containing cavity for containing the seawater lifting pump is arranged inside the pipe body, and the pipe body is used for being sleeved at the end part of the seawater lifting pump;

the limiting pieces are arranged on the inner wall surface of the pipe body at the second end and are arranged at intervals along the circumferential direction, and are used for limiting the movement of the seawater lift pump along the circumferential direction, the radial direction and the axial direction of the pipe body;

the guide rib is arranged on the inner wall surface of the pipe body and extends along the axial direction of the pipe body.

2. The pedestal for supporting a seawater lift pump as claimed in claim 1, wherein each of the position-limiting members has a slot at a middle portion thereof, and the supporting ring is engaged with a plurality of the slots.

3. The pedestal for supporting a seawater lift pump of claim 2, further comprising an anti-wear ring disposed in the inner wall surface of the tube at the first end;

4. The pedestal of claim 3, wherein the retaining member and the wear ring are made of dual-phase stainless steel.

5. The base of claim 1, further comprising a reinforcement ring at the first end, wherein the reinforcement ring is disposed around an outer wall of the tubular body.

6. A base for supporting a seawater lift pump as claimed in any one of claims 1 to 5 wherein the wall thickness of the tubular body is 60mm and the diameter of the tubular body is 2020 mm;

the material of body is EH36 steel.

7. A method of manufacturing a foundation for supporting a seawater lift pump as claimed in any one of claims 1 to 6, wherein the method of manufacturing comprises the steps of:

s3, installing the support ring and the limiting pieces on the pipe body.

8. The method of manufacturing a susceptor for supporting a seawater lift pump of claim 7, wherein the step S1 comprises the steps of:

9. The method of manufacturing a susceptor for supporting a seawater lift pump of claim 8, wherein in performing steps S12 and S13, the method of manufacturing further comprises the steps of:

10. The method of manufacturing a susceptor for supporting a seawater lift pump of claim 7, wherein the step S2 comprises the steps of:

s21, hoisting the preformed pipe body to a jig;

and S23, welding the splicing seams.

11. The method of manufacturing a susceptor for supporting a seawater lift pump of claim 10, wherein in performing step S23, the method further comprises the steps of:

12. The method for manufacturing a susceptor for supporting a seawater lift pump of claim 10, wherein the groove during welding is a double-sided X-shaped groove in step S23.