CA1178813A - Sealing system for use on an offshore platform and a method of applying this sealing system - Google Patents
Sealing system for use on an offshore platform and a method of applying this sealing systemInfo
- Publication number
- CA1178813A CA1178813A CA000406746A CA406746A CA1178813A CA 1178813 A CA1178813 A CA 1178813A CA 000406746 A CA000406746 A CA 000406746A CA 406746 A CA406746 A CA 406746A CA 1178813 A CA1178813 A CA 1178813A
- Authority
- CA
- Canada
- Prior art keywords
- sealing system
- fire
- coating
- barrier
- gap
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000007789 sealing Methods 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 42
- 238000000576 coating method Methods 0.000 claims abstract description 34
- 239000011248 coating agent Substances 0.000 claims abstract description 33
- 239000011496 polyurethane foam Substances 0.000 claims abstract description 33
- 230000004888 barrier function Effects 0.000 claims abstract description 32
- 229920005830 Polyurethane Foam Polymers 0.000 claims abstract description 30
- 238000011065 in-situ storage Methods 0.000 claims abstract description 13
- 239000006260 foam Substances 0.000 claims description 11
- 239000004814 polyurethane Substances 0.000 claims description 9
- 238000005507 spraying Methods 0.000 claims description 9
- 229920002635 polyurethane Polymers 0.000 claims description 8
- 239000007921 spray Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000001035 drying Methods 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 2
- 238000009472 formulation Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 239000000779 smoke Substances 0.000 abstract description 3
- 239000010779 crude oil Substances 0.000 abstract description 2
- 239000003921 oil Substances 0.000 abstract description 2
- -1 vapour Substances 0.000 abstract description 2
- 239000011253 protective coating Substances 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- UPMLOUAZCHDJJD-UHFFFAOYSA-N 4,4'-Diphenylmethane Diisocyanate Chemical compound C1=CC(N=C=O)=CC=C1CC1=CC=C(N=C=O)C=C1 UPMLOUAZCHDJJD-UHFFFAOYSA-N 0.000 description 2
- 229920005862 polyol Polymers 0.000 description 2
- 150000003077 polyols Chemical class 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 101100008053 Schizosaccharomyces pombe (strain 972 / ATCC 24843) cut9 gene Proteins 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 238000005187 foaming Methods 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000013521 mastic Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000037452 priming Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 238000010407 vacuum cleaning Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPINGÂ
- B63B3/00—Hulls characterised by their structure or component parts
- B63B3/14—Hull parts
- B63B3/68—Panellings; Linings, e.g. for insulating purposes
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B17/00—Artificial islands mounted on piles or like supports, e.g. platforms on raisable legs or offshore constructions; Construction methods therefor
- E02B17/0008—Methods for grouting offshore structures; apparatus therefor
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B35/00—Methods or apparatus for preventing or extinguishing fires
Landscapes
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Geology (AREA)
- Environmental & Geological Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Ocean & Marine Engineering (AREA)
- Building Environments (AREA)
- Revetment (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
Abstract
A B S T R A C T
A SEALING SYSTEM FOR USE ON AN OFFSHORE PLATFORM
AND A METHOD FOR APPLYING THIS SEALING SYSTEM
On offshore platforms, in particular on offshore platforms for the production of crude oil or gas, it is necessary to separate so-called safe areas from so-called classified areas, in order to prevent the passage of oil, gas, vapour, smoke and flames. Consequently, gaps between units on the platform or gaps between said units and parts of the platform have to be sealed. Said units are for example equipment-containing modules which are generally used on offshore platforms. The invention relates to a new sealing system for this purpose comprising a barrier of polyurethane foam, foamed in-situ, and arranged in the gap, at least part of the surface of said barrier being covered with a coating of a fire-protective material.
(Fig.6)
A SEALING SYSTEM FOR USE ON AN OFFSHORE PLATFORM
AND A METHOD FOR APPLYING THIS SEALING SYSTEM
On offshore platforms, in particular on offshore platforms for the production of crude oil or gas, it is necessary to separate so-called safe areas from so-called classified areas, in order to prevent the passage of oil, gas, vapour, smoke and flames. Consequently, gaps between units on the platform or gaps between said units and parts of the platform have to be sealed. Said units are for example equipment-containing modules which are generally used on offshore platforms. The invention relates to a new sealing system for this purpose comprising a barrier of polyurethane foam, foamed in-situ, and arranged in the gap, at least part of the surface of said barrier being covered with a coating of a fire-protective material.
(Fig.6)
Description
7~813 A SEALING SYSTF~ FOR USE 0~ AN OFFSHORE PLATFORM
AND A ~ETHOD OF APPLYING THIS SEALING SYSTEM
On offshore platforms, in particular on offshore platforms for the production of crude oil or gas, it is necessary to separate so-called safe areas from so-called classified areas, in order to prevent the passage of oil, gas, vapour, smoke and flames.
For this purpose gaps between units on the platform or gaps between said units and parts of the platform have to be sealed. Said units are for example equipment-containing modules which are generally used on offshore platforms.
According to a known system, the said gaps are closed by tack-welding steel strips or plates to adjacent units or to units and adjacent parts of the platform, whereafter sealing strips of rubber or of a similar material are bonded by means of a suitable adhesive to adjacent units or to units and ad-jacent parts of the platform. The welding of the steel strips or plates is time-consuming and the sealing strips tend to deteriorate rather quickly, so that frequent maintenance is necessary.
It is an object of the invention to provide an improved sealing system and an improved method of applying said sealing system, having the advantage that the sealing system can be installed in a shorter period of time than that required for the known sealing system. This means not only that the cost of installing the improved sealing system is lower than the cost of installing the known sealing system, but also that large cost savings are obtained due to the fact that the down time of the production platform is reduced substantially.
1~ 813 According to the invention a sealing system for sealing a gap between units on an offshore platform, or between said units and parts of the offshore platform, comprises a barrier of polyurethane foam, foamed in-situ, and arranged in the eaP~
at least part of the surface of said barrier being covered with a coating of a fire-protective material.
In a suitable embodiment of the above invention, a pre-fabricated plate of which a side is covered with a coating of fire-protective material is present in the gap and the barrier of polyurethane foam, foamed in-situ, is arranged against a side of the prefabricated plate which is not covered with the fire-protective material. If desired, the plate is made of polyurethane foam.
A method of applying the above sealing system co~prises, according to the invention, cleaning and drying the walls of the gap, supplying polyurethane-forming components to the gap and allowing the polyurethane to foam in-situ so that a barrier of polyurethane foam is formed in the gap and covering at least part of the surface of the barrier with a coating of fire-protective material.
A preferred embodiment of this method comprises, accordingto the invention, first placing in the gap a prefabricated plate of which a side is covered with a coating of fire-pro-tective material, supplying the polyurethane-fo~ming components to the gap at a side of the plate which is not covered with the fire-protective material, and allowing the polyurethane to foam in-situ so that a barrier of polyurethane foam i5 formed in the gap and covering at least part of the surface of the barrier with a coating of fire-protective material.
The invention will be explained with reference to the drawings, wherein Figure 1 shows schematically a side view of a deck of an offshore platform on which a number of units are arranged;
Figure 2 shows a first embodiment of the proposed sealing system in cross-section;
Figure 3 shows~ a second embodiment of the proposed sealing system in croas-secti`on;
Figure 4 shows a third embodiment of the proposed sealing system in cross-section;
Figure 5 shows a fourth embodiment of the proposed sealing system in cross-section;
Figure 6 shows a fifth embodiment of the proposed sealing system in cross-section;
Figure 7 shows various steps a, b, c, d, e, f, g, h of the method of applying the sealing system according to the invention.
In figure 1, a deck, for example the cellar-deck, of an offshore platform is indicated by the reference numeral 1. On the deck 1 a number of units 2, such as prismatic modules con-taining equipment, are arranged. On top of the modules 2 further modules 2a are arranged. I beams 5 are secured to the bottom walls of the modules 2 and 2a, so that gaps 3a are present between the modules 2 and the deck 1 and gaps 3b are present betweenthe modules 2 and 2a. Furthermore, gaps 3c are present between the modules 2 and gaps 3d are present between the modules 2a.
It is necessary to arrange a sealing system in the gaps 3a, 3b, 3c and 3d, in order to isolate a safe area from a classified area on the platform. For this purpose, the sealing system according to the invention is used.
In the figures 2 through 7 a wall of a unit 2 is indicated by the reference numeral 7 and a wall of another unit, of a deck or of some other element of the platform is indicated by the reference numeral 8. Between the walls 7 and 8 a gap 9 is present.
In the gap 9 the sealing system according to the invention is arranged.
In figures 2 and 3, a simple embodiment of the sealing system according to the invention is shown. In figures 2 and 3 polyurethane-forming components are supplied to the gap 9, preferably by spraying, whereafter the polyurethane is allowed to foam in-situ, so that a barrier 10 is formed in the gap 9.
In the embodiment of figure 2 the outer surface at one side of the barrier 10 is~covered with a fire-protective coating 11. In the embodiment of figure 3, the outer surfaces at both sides of the barrier 10 are covered with coating 12,respectively 13, of fire-protective material. In both embodiments, it is possible to arrange a prefabricated plate (not shown) in the gap before starting the spraying operation, which plate can be removed after the spraying operation has been completed.
In figures 4 and 5, the sealing system comprises a pre-fabricated plate 15 for example made of a rigid polyurethane foam, covered at one side with a coating 16 of fire-protective material, arranged in the gap 9 and a barrier 18 of polyurethane foam, foamed in-situ, arranged in the gap 9 at the side of the plate 15 which is not provided with fire-protective material.
The outer surface of the barrier 18 is covered with a coating 17 of fire-protective material. The only difference between the embodiments as shown in figures 4 and 5 is that, in the embodiment according to figure 5, the outer surface of the barrier 18 is trimmed, so that a flat outer svrface is obtained before the application of the coating 17 of fire-protective material.
The embodiment of the sealing system as shown in Figure 6 will now be aescribed in detail.
A prefabricated plate 15 of polyurethane foam pre-sprayed at one side with a coating 16 of fire-protective material is arranged in the gap 9. The plate 15 is made of a low density, fire-retarded, grade of rigid closed cell polyurethane foam, for example having a density of 29 kg/m3 and a compressive strength of 172 kN/m3. Such a polyurethane t`oam is available from Coolag Ltd, Charleston, Glossop, Derbyshire, England. The coating 16 of fire-protective material is for example Thermo-Lag 290 (a registered trade mark and marketed by T.S.I. Inc. of St. Louis, Missouri, U.S.A.) which is a low temperature, 117~3 subliming, water-based, mastic for the protection of com-bustible building- and insulating materials. The thickness of the coating 16 is for example 6 mm.
Before applying coating 16 the surface o~ the polyurethane plate 15 must be prepared by vacuum cleaning to remove dust, followed by priming with a suitable primer. ~hen the coating 16 of fire-protective material is Thermo-Lag 290 a recommended primer is Thermo-Lag 351 primer (a registered trade mark and marketed by T.S.I. Inc. of St. Louis, Missouri, U.S.A.). In lO fieure 6 the layer of primer is indicated by the reference numeral 25. After the coating 16 of Thermo-Lag 290 has been applied, for example by spraying, the outer surface of the coating 16 is finished by applying a protective coating 26 of Thermo-Lag 350 top coat (a registered trade mark and m&rketed by T.S.I. Inc. of St. Louis, Missouri, U.S.A.).
The plate 15 with the coatings 25, 16, 26 is prefabricated and cut to the proper size before it is inserted into the gap 9.
After the plate 15 has been properly positioned in the gap 9 as shown, polyurethane-forming co~ponents are sprayed against 20 the walls 7 and 8 and against the side 27 of the plate 15, which is not provided with a fire-protective oating. The poly-urethane is allowed to foam in-situ. If the height of the gap 9 is between 25 and 75 mm, a single spray operation is sufficient, but for a height of the gap 9 between 75 and 200 mm three or 25 four spray operations are necessary.
In the embodiment according to figure 6 four spray oper-ations are necessary, so that four layers 28, 29, 30, 31 of polyurethane foam are applied. Together these layers form the barrier 18. The foam is made by reacting a polyol system with MDI (4,4'-diphenylmethane diisocyanate). The polyol system is a spray polyurethane foam formulation known as SS 215 ( a re-gistered trade mark and marketed by the "Baxenden Chemical Company"
of Lancashire, England), which is specially formulated as a cold weather spray system which has good adhesion to steel in ,.
the region +0.5 to 7 C. It is a fire-retarded grade of poly-urethane foam, haying a densit~ in the region of 30 to 40 ke/m3 which can be easily cut and worked by means of hand tools. The foam forms a good bond to the polyurethane foam plate 16 and to the walls 7 and 8. The rheological properties of the rising foam are such that it can flow into and plug any imperfections and openings between the plate 15 and the walls 7 and 8. See in this connection the opening 32 which is filled by the poly-urethane foam of the layer 30.
On top of the surface of the layer 30 of polyurethane foam a layer 33 of primer is applied, for example Thermo-Lag primer 351. Then the final layer 31 of polyurethane foam is applied.
Since the sprayed polyuretbane foam will overfill the gap 9, it is necessary to cut the layer 31 in order to obtain a flat surface 34 before the fire-protective coating is applied. Then the cut flat surface 34 of polyurethane foam is primed with Thermo-Lag 351 primer, a fire-protective coating 35 of Thermo-Lag 290 is applied to the surface 34 and to the walls 7 and 8 in the manner as shown in figure 6, and firally the outer surface of the coating 35 is finished by applying a protective coating 36 of Thermo-Lag 350 top coat.
For safety reasons the safe area on the platform is pres-surized to prevent gas, smoke or flames to pass from the classified area to the safe area. The sealing system according to the invention is able to resist a pressure difference of up to 1 ata.
It is observed that if the prefabricated plate 15 of rigid polyurethane foam~ has to be placed in curved sections, the plate is provided with saw cut9 to allow the plate to negotiate curvature. The saw cuts are arranged at the side of the plate which is not provided with fire-protective coating.
In figure 7a through h, various steps of a method of applying a barrier according to the invention are shown.
In figure 7a, the walls 7 and 8 are dried by means of compressed air and in figure 7b the said walls 7 and 8 are further dried by means of a rag. Before the drying of the walls 7 and 8 it is necessary to clean the walls in order to remove grease and/or dirt.
The prefabricated plate 15 of rigid closed cell poly-urethane foam, provided at one side with a coating of fire-protective material 16, is fitted in the gap 9 (see figure 7c).
Then the polyurethane-forming components are sprayed (see figure 7d) into the gap 9 against the walls 7 and 8 and against the side of the plate 15 which is not covered with fire-protect-ive material. The polyurethane is allowed to foam in-situ, so that a barrier 18 is formed and a good bond is obtained between the barrier 18, the walls 7 and 8 and the plate 15. After the spraying and foaming operation, the outer side of the barrier 18 is trimmed (see figure 7e) by means of a suitable cutting tool, so that a flat outer surface 20 of the barrier 18 is obtained, whereafter the cut flat surface 20 is covered with a suitable primer, for example by spraying (see figure 7f). Then a coat-ing 21 of fire-protective material is applied to the surface 20 by means of a spraying method (see figure 7g). Finally, a top coat 22, for example a suitable paint, is sprayed on top of the coating 21 of fire-protective material (see figure 7h).
AND A ~ETHOD OF APPLYING THIS SEALING SYSTEM
On offshore platforms, in particular on offshore platforms for the production of crude oil or gas, it is necessary to separate so-called safe areas from so-called classified areas, in order to prevent the passage of oil, gas, vapour, smoke and flames.
For this purpose gaps between units on the platform or gaps between said units and parts of the platform have to be sealed. Said units are for example equipment-containing modules which are generally used on offshore platforms.
According to a known system, the said gaps are closed by tack-welding steel strips or plates to adjacent units or to units and adjacent parts of the platform, whereafter sealing strips of rubber or of a similar material are bonded by means of a suitable adhesive to adjacent units or to units and ad-jacent parts of the platform. The welding of the steel strips or plates is time-consuming and the sealing strips tend to deteriorate rather quickly, so that frequent maintenance is necessary.
It is an object of the invention to provide an improved sealing system and an improved method of applying said sealing system, having the advantage that the sealing system can be installed in a shorter period of time than that required for the known sealing system. This means not only that the cost of installing the improved sealing system is lower than the cost of installing the known sealing system, but also that large cost savings are obtained due to the fact that the down time of the production platform is reduced substantially.
1~ 813 According to the invention a sealing system for sealing a gap between units on an offshore platform, or between said units and parts of the offshore platform, comprises a barrier of polyurethane foam, foamed in-situ, and arranged in the eaP~
at least part of the surface of said barrier being covered with a coating of a fire-protective material.
In a suitable embodiment of the above invention, a pre-fabricated plate of which a side is covered with a coating of fire-protective material is present in the gap and the barrier of polyurethane foam, foamed in-situ, is arranged against a side of the prefabricated plate which is not covered with the fire-protective material. If desired, the plate is made of polyurethane foam.
A method of applying the above sealing system co~prises, according to the invention, cleaning and drying the walls of the gap, supplying polyurethane-forming components to the gap and allowing the polyurethane to foam in-situ so that a barrier of polyurethane foam is formed in the gap and covering at least part of the surface of the barrier with a coating of fire-protective material.
A preferred embodiment of this method comprises, accordingto the invention, first placing in the gap a prefabricated plate of which a side is covered with a coating of fire-pro-tective material, supplying the polyurethane-fo~ming components to the gap at a side of the plate which is not covered with the fire-protective material, and allowing the polyurethane to foam in-situ so that a barrier of polyurethane foam i5 formed in the gap and covering at least part of the surface of the barrier with a coating of fire-protective material.
The invention will be explained with reference to the drawings, wherein Figure 1 shows schematically a side view of a deck of an offshore platform on which a number of units are arranged;
Figure 2 shows a first embodiment of the proposed sealing system in cross-section;
Figure 3 shows~ a second embodiment of the proposed sealing system in croas-secti`on;
Figure 4 shows a third embodiment of the proposed sealing system in cross-section;
Figure 5 shows a fourth embodiment of the proposed sealing system in cross-section;
Figure 6 shows a fifth embodiment of the proposed sealing system in cross-section;
Figure 7 shows various steps a, b, c, d, e, f, g, h of the method of applying the sealing system according to the invention.
In figure 1, a deck, for example the cellar-deck, of an offshore platform is indicated by the reference numeral 1. On the deck 1 a number of units 2, such as prismatic modules con-taining equipment, are arranged. On top of the modules 2 further modules 2a are arranged. I beams 5 are secured to the bottom walls of the modules 2 and 2a, so that gaps 3a are present between the modules 2 and the deck 1 and gaps 3b are present betweenthe modules 2 and 2a. Furthermore, gaps 3c are present between the modules 2 and gaps 3d are present between the modules 2a.
It is necessary to arrange a sealing system in the gaps 3a, 3b, 3c and 3d, in order to isolate a safe area from a classified area on the platform. For this purpose, the sealing system according to the invention is used.
In the figures 2 through 7 a wall of a unit 2 is indicated by the reference numeral 7 and a wall of another unit, of a deck or of some other element of the platform is indicated by the reference numeral 8. Between the walls 7 and 8 a gap 9 is present.
In the gap 9 the sealing system according to the invention is arranged.
In figures 2 and 3, a simple embodiment of the sealing system according to the invention is shown. In figures 2 and 3 polyurethane-forming components are supplied to the gap 9, preferably by spraying, whereafter the polyurethane is allowed to foam in-situ, so that a barrier 10 is formed in the gap 9.
In the embodiment of figure 2 the outer surface at one side of the barrier 10 is~covered with a fire-protective coating 11. In the embodiment of figure 3, the outer surfaces at both sides of the barrier 10 are covered with coating 12,respectively 13, of fire-protective material. In both embodiments, it is possible to arrange a prefabricated plate (not shown) in the gap before starting the spraying operation, which plate can be removed after the spraying operation has been completed.
In figures 4 and 5, the sealing system comprises a pre-fabricated plate 15 for example made of a rigid polyurethane foam, covered at one side with a coating 16 of fire-protective material, arranged in the gap 9 and a barrier 18 of polyurethane foam, foamed in-situ, arranged in the gap 9 at the side of the plate 15 which is not provided with fire-protective material.
The outer surface of the barrier 18 is covered with a coating 17 of fire-protective material. The only difference between the embodiments as shown in figures 4 and 5 is that, in the embodiment according to figure 5, the outer surface of the barrier 18 is trimmed, so that a flat outer svrface is obtained before the application of the coating 17 of fire-protective material.
The embodiment of the sealing system as shown in Figure 6 will now be aescribed in detail.
A prefabricated plate 15 of polyurethane foam pre-sprayed at one side with a coating 16 of fire-protective material is arranged in the gap 9. The plate 15 is made of a low density, fire-retarded, grade of rigid closed cell polyurethane foam, for example having a density of 29 kg/m3 and a compressive strength of 172 kN/m3. Such a polyurethane t`oam is available from Coolag Ltd, Charleston, Glossop, Derbyshire, England. The coating 16 of fire-protective material is for example Thermo-Lag 290 (a registered trade mark and marketed by T.S.I. Inc. of St. Louis, Missouri, U.S.A.) which is a low temperature, 117~3 subliming, water-based, mastic for the protection of com-bustible building- and insulating materials. The thickness of the coating 16 is for example 6 mm.
Before applying coating 16 the surface o~ the polyurethane plate 15 must be prepared by vacuum cleaning to remove dust, followed by priming with a suitable primer. ~hen the coating 16 of fire-protective material is Thermo-Lag 290 a recommended primer is Thermo-Lag 351 primer (a registered trade mark and marketed by T.S.I. Inc. of St. Louis, Missouri, U.S.A.). In lO fieure 6 the layer of primer is indicated by the reference numeral 25. After the coating 16 of Thermo-Lag 290 has been applied, for example by spraying, the outer surface of the coating 16 is finished by applying a protective coating 26 of Thermo-Lag 350 top coat (a registered trade mark and m&rketed by T.S.I. Inc. of St. Louis, Missouri, U.S.A.).
The plate 15 with the coatings 25, 16, 26 is prefabricated and cut to the proper size before it is inserted into the gap 9.
After the plate 15 has been properly positioned in the gap 9 as shown, polyurethane-forming co~ponents are sprayed against 20 the walls 7 and 8 and against the side 27 of the plate 15, which is not provided with a fire-protective oating. The poly-urethane is allowed to foam in-situ. If the height of the gap 9 is between 25 and 75 mm, a single spray operation is sufficient, but for a height of the gap 9 between 75 and 200 mm three or 25 four spray operations are necessary.
In the embodiment according to figure 6 four spray oper-ations are necessary, so that four layers 28, 29, 30, 31 of polyurethane foam are applied. Together these layers form the barrier 18. The foam is made by reacting a polyol system with MDI (4,4'-diphenylmethane diisocyanate). The polyol system is a spray polyurethane foam formulation known as SS 215 ( a re-gistered trade mark and marketed by the "Baxenden Chemical Company"
of Lancashire, England), which is specially formulated as a cold weather spray system which has good adhesion to steel in ,.
the region +0.5 to 7 C. It is a fire-retarded grade of poly-urethane foam, haying a densit~ in the region of 30 to 40 ke/m3 which can be easily cut and worked by means of hand tools. The foam forms a good bond to the polyurethane foam plate 16 and to the walls 7 and 8. The rheological properties of the rising foam are such that it can flow into and plug any imperfections and openings between the plate 15 and the walls 7 and 8. See in this connection the opening 32 which is filled by the poly-urethane foam of the layer 30.
On top of the surface of the layer 30 of polyurethane foam a layer 33 of primer is applied, for example Thermo-Lag primer 351. Then the final layer 31 of polyurethane foam is applied.
Since the sprayed polyuretbane foam will overfill the gap 9, it is necessary to cut the layer 31 in order to obtain a flat surface 34 before the fire-protective coating is applied. Then the cut flat surface 34 of polyurethane foam is primed with Thermo-Lag 351 primer, a fire-protective coating 35 of Thermo-Lag 290 is applied to the surface 34 and to the walls 7 and 8 in the manner as shown in figure 6, and firally the outer surface of the coating 35 is finished by applying a protective coating 36 of Thermo-Lag 350 top coat.
For safety reasons the safe area on the platform is pres-surized to prevent gas, smoke or flames to pass from the classified area to the safe area. The sealing system according to the invention is able to resist a pressure difference of up to 1 ata.
It is observed that if the prefabricated plate 15 of rigid polyurethane foam~ has to be placed in curved sections, the plate is provided with saw cut9 to allow the plate to negotiate curvature. The saw cuts are arranged at the side of the plate which is not provided with fire-protective coating.
In figure 7a through h, various steps of a method of applying a barrier according to the invention are shown.
In figure 7a, the walls 7 and 8 are dried by means of compressed air and in figure 7b the said walls 7 and 8 are further dried by means of a rag. Before the drying of the walls 7 and 8 it is necessary to clean the walls in order to remove grease and/or dirt.
The prefabricated plate 15 of rigid closed cell poly-urethane foam, provided at one side with a coating of fire-protective material 16, is fitted in the gap 9 (see figure 7c).
Then the polyurethane-forming components are sprayed (see figure 7d) into the gap 9 against the walls 7 and 8 and against the side of the plate 15 which is not covered with fire-protect-ive material. The polyurethane is allowed to foam in-situ, so that a barrier 18 is formed and a good bond is obtained between the barrier 18, the walls 7 and 8 and the plate 15. After the spraying and foaming operation, the outer side of the barrier 18 is trimmed (see figure 7e) by means of a suitable cutting tool, so that a flat outer surface 20 of the barrier 18 is obtained, whereafter the cut flat surface 20 is covered with a suitable primer, for example by spraying (see figure 7f). Then a coat-ing 21 of fire-protective material is applied to the surface 20 by means of a spraying method (see figure 7g). Finally, a top coat 22, for example a suitable paint, is sprayed on top of the coating 21 of fire-protective material (see figure 7h).
Claims (19)
1. A sealing system for sealing a gap between units on an offshore platform, or between said units and parts of the offshore platform, comprising a barrier of polyurethane foam, foamed in-situ, and arranged in the gap, at least part of the surface of said barrier being covered with a coating of a fire-protective material.
2. The sealing system as claimed in claim 1, wherein a prefabircated plate of which a side is covered with a coating of fire-protective material is present in the gap and the barrier of polyurethane foam, foamed in-situ, is arranged against a side of the prefabricated plate which is not covered with the fire-protective material.
3. The sealing system as claimed in claim 2, wherein the plate is made of polyurethane foam.
4. The sealing system as claimed in claim 1, wherein the polyurethane foam forming the barrier is a spray polyurethane foam formulation known as SS 215(a registered trade mark and marketed by the "Baxenden Chemical Company" of Lancashire, England).
5. The sealing system as claimed in claim 3, wherein the polyurethane foam forming the plate is a low density fire-retarded grade of rigid closed cell polyurethane foam.
6. The sealing system as claimed in claim 5, wherein the polyurethane foam forming the plate has a density of 29 kg/m3.
7. The sealing system as claimed in claim 1, wherein the coating of fire-protective material is a subliming material.
8. The sealing system as claimed in claim 7, wherein the subliming material is water based.
9. The sealing system as claimed in claim 8, wherein the fire-protective material is Thermo-Lag 290 (a registered trade mark and marketed by T.S.I. Inc. of St. Louis, Missouri, U.S.A.).
10. A method of applying a sealing system as claimed in claim 1, comprising cleaning and drying the walls of the gap, supplying polyurethane-forming components to the gap and allow-ing the polyurethane to foam in-situ so that a barrier of polyurethane foam is formed in the gap and covering at least part of the surface of the barrier with a coating of fire-protective material.
11. The method as claimed in claim 10, comprising first placing in the gap a prefabricated plate of which a side is covered with a coating of fire-protective material, supplying the polyurethane-forming components to the gap at a side of the plate which is not covered with the fire-protective material, and allowing the polyurethane to foam in-situ so that a barrier of polyurethane foam is formed in the gap and covering at least part of the surface of the barrier with a coating of fire-protective material.
12. The method as claimed in claim 11, wherein the plate as used is made of polyurethane foam.
13. The method as claimed in claim 10, 11 or 12, wherein the polyurethane-forming components are supplied to the gap by spraying.
14. The method as claimed in claim 10, 11 or 12, wherein before covering the surface of the barrier of polyurethane foam with a coating of fire-protective material, the barrier is trimmed.
15. The method as claimed in claim 10, 11 or 12, wherein the coating of fire-protective material is applied to the surface of the barrier of polyurethane foam by spraying.
16. The sealing system as claimed in claim 2, 3 or 4, wherein the coating of fine-protective mate-rial is a subliming material.
17. The sealing system as claimed in claim 5 or 6, wherein the coating of fine-protective mate-rial is a subliming material.
18. The sealing system as claimed in claim 2, 3 or 4, wherein the coating of fire-protective mate-rial is a water based subliming material.
19. The sealing system as claimed in claim 5 or 6, wherein the coating of fire-protective mate-rial is a water based subliming material.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB08123327A GB2103482B (en) | 1981-07-30 | 1981-07-30 | A sealing system for use on an offshore platform |
| GB8123327 | 1981-07-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1178813A true CA1178813A (en) | 1984-12-04 |
Family
ID=10523569
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000406746A Expired CA1178813A (en) | 1981-07-30 | 1982-07-06 | Sealing system for use on an offshore platform and a method of applying this sealing system |
Country Status (5)
| Country | Link |
|---|---|
| CA (1) | CA1178813A (en) |
| DK (1) | DK161983C (en) |
| GB (1) | GB2103482B (en) |
| NL (1) | NL8202795A (en) |
| NO (1) | NO163148C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2802792A (en) * | 1992-04-02 | 1993-11-08 | Akro-Fireguard Products, Inc. | Aircraft fuselage flame barrier |
| NO335676B1 (en) | 2012-12-07 | 2015-01-19 | Apl Technology As | Pipe connector for releasable connection of two connector parts in connection with gas tight connection of riser to vessel |
-
1981
- 1981-07-30 GB GB08123327A patent/GB2103482B/en not_active Expired
-
1982
- 1982-07-06 CA CA000406746A patent/CA1178813A/en not_active Expired
- 1982-07-09 NL NL8202795A patent/NL8202795A/en not_active Application Discontinuation
- 1982-07-28 DK DK336582A patent/DK161983C/en active
- 1982-07-28 NO NO822594A patent/NO163148C/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| DK161983B (en) | 1991-09-02 |
| NO163148B (en) | 1990-01-02 |
| NO163148C (en) | 1990-04-11 |
| GB2103482A (en) | 1983-02-23 |
| DK336582A (en) | 1983-01-31 |
| NL8202795A (en) | 1983-02-16 |
| NO822594L (en) | 1983-01-31 |
| GB2103482B (en) | 1985-05-09 |
| DK161983C (en) | 1992-02-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA1112806A (en) | Swimming pool construction and method of making the same | |
| US4784902A (en) | Components that can exhibit low smoke, toxic fume and burning characteristics, and their manufacture | |
| US7316099B2 (en) | Spaced sheathing roofing system and method of installing same | |
| CA1199482A (en) | Reverse building process for the manufacture of complex-shaped vehicle fuel tanks | |
| US5985362A (en) | Insulation system for transport aircraft | |
| CA1178813A (en) | Sealing system for use on an offshore platform and a method of applying this sealing system | |
| EP3847012B1 (en) | Double skin structure with interstitial spacer | |
| EP1597174B1 (en) | Panels for floating covers, floating covers and methods for making them | |
| US7134244B2 (en) | Stabilized window structures and methods of stabilizing and removing shattered glass from window structures | |
| US8449967B2 (en) | Composite elements | |
| CN100453755C (en) | Polyurethane composite board and its application | |
| EP2550414B1 (en) | Construction method and system with containers | |
| US11359369B2 (en) | Device and process for thermal isolation of technical elements | |
| DE102022109851A1 (en) | Shower floor element and method for its manufacture | |
| WO2019236959A1 (en) | Thermally insulated structures and method for fabricating same | |
| KR102268824B1 (en) | The multi-plate complex sheet with impact absorption, anti-root ingress and Construction Method Thereof | |
| EP0164952A2 (en) | Composite panel, manufacture thereof and use thereof in cladding a roof or wall of a building | |
| CN111936703A (en) | Security barrier made of mineral wool that can be filled with liquid | |
| US20240082863A1 (en) | Robotically applied 3d-sprayable exterior insulation and finish systems (eifs) for building envelope retrofits | |
| GB2190409A (en) | Barrier of particle board and vermiculite containing layer | |
| AU2002100047A4 (en) | Spray-on joint seal protection | |
| WATERPROOFING | SECTION 07 13 00 SHEET MEMBRANE WATERPROOFING | |
| CONTROLS | 1.7 DELIVERY, STORAGE AND MARKING | |
| CA1275776C (en) | Situ roofing composite and method | |
| NO | CRAIG, GAULDEN AND DAVIS, INC. 19 WASHINGTON PARK GREENVILLE, SOUTH CAROLINA 29601 Telephone (864) 242-0761 Email ddixon@ cgdarch. com |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEC | Expiry (correction) | ||
| MKEX | Expiry |