Drawing No Rev. Title Cargo Drawings Approval stamp Comment status HT 500095 0 Holding Time 10bar - 40ft 46000L 02b Pending 500095-01 0 GENERAL ARRANGEMENT 01b (?) Pending 500095-02 0 INNER TANK ASSEMBLY 01b (?) Pending 500095-03 0 OUTER TANK ASSEMBLY 01b (?) Pending 500095-04 0 LINE 01b Pending 500095-11 0 P&ID PLATE 01b Pending TSCT500095 0 TECHNICAL SPECIFICATION 02b (?) Pending RV 10bar 0 Relief valve sizing 02b Pending 500095-46-10-17- 001 0 46000l 10bar Cryogenic Tank 02b Pending ML 500095 0 Cryogenic Multilayer 02b Pending Approval stamp legend : 01b : reviewed with comments 02b : vu with comments Note : Meaning of comment type Comment type Meaning To be dealt with the manufacturer or shipbuilder should reply the issued comments to the satisfaction of our attending Surveyor. the manufacturer or shipbuilder should reply the issued comments to the satisfaction of our Plan Approval Office, without which the survey at works or shipbuilders cannot be completed. Note For information. No reply expected. Page 1/8
Cargo Comments on sets of drawings ID : LPO1323381 Note Status : Submitted ID : LPO1323405 ID : LPO1323433 N 500095-04 0 LINE N 500095-11 0 P&ID PLATE N HT 500095 0 Holding Time 10bar - 40ft 46000L N RV 10bar 0 Relief valve sizing Scope of review : (C. Remiro Bellostas (BV PARIS) on 30 Oct 2017 ) This document/drawing has been reviewed according to IGF Code (MSC.391(95)) and NR529 rev.02 dated 2017. Standard : (C. Remiro Bellostas (BV PARIS) on 30 Oct 2017 ) It is noted in 1.9 the material of construction that reference is made to European Standard EN 10028-7 for inner tank, outer tank and baffles. However, from doc. 500095-46-10-176001 we understand that mechanical properties are taken from ASME. Please clarify the standard. N 500095-04 0 LINE N 500095-11 0 P&ID PLATE Line J : (C. Remiro Bellostas (BV PARIS) on 30 Oct 2017 ) It is noted that line J is a single wall pipe connected below the highest liquid level of the tank and this lines goes up to the PBU (in the P&ID). According to IGF Code 6.3.9 if piping is connected below the liquid level of the tank, it has to be protected by a secondary barrier up to the first valve. Please update. Page 2/8
Cargo Comments on sets of drawings ID : LPO1323470 N 500095-11 0 P&ID PLATE N RV 10bar 0 Relief valve sizing Distance from sloped liquid surface to the PRV inlet : (C. Remiro Bellostas (BV PARIS) on 30 Oct 2017 ) Tank outlet to the pressure relief valves should remain in the vapour phase at the 98% liquid level and IGF Code specified list and trim. According to IGF Code 6.7.2.13 PRVs shall be connected to the highest part of the fuel tank. PRVs shall be positioned on the fuel tank so that will remain in the vapour phase at the maximum filling limit under the conditions of 15 list and 0.015L trim. The distance between the inclined liquid surface due to trim and list and the inlet of the pipe going to the pressure relief valves is to be calculated and submitted to the Society to make sure that the inlet is above the liquid level at all conditions. ID : LPO1323474 ID : LPO1323582 ID : LPO1323583 N 500095-11 0 P&ID PLATE N RV 10bar 0 Relief valve sizing Pressure losses : (C. Remiro Bellostas (BV PARIS) on 30 Oct 2017 ) Pressure losses upstream and downstream the PRVs shall be taken into account to ensure flow capacity calculated according to IGF Code 6.7.3.1. N 500095-03 0 OUTER TANK ASSEMBLY Outer vessel : (C. Remiro Bellostas (BV PARIS) on 30 Oct 2017 ) Strength calculation of the outer vessel remains to be submitted. N 500095-03 0 OUTER TANK ASSEMBLY External design pressure : (C. Remiro Bellostas (BV PARIS) on 30 Oct 2017 ) It is noted that 1,0 barg has been taken as external design pressure (page 1/6). According to IGF Code 6.4.15.3.2.8 the design external pressure Pe in MPa, used for verifying the buckling of pressure vessels shall not be less than P1+P2+P3+P4. Please define the values of P1, P2, P3 and P4 considered to obtain only 1barg as external design pressure. Page 3/8
Cargo Comments on sets of drawings ID : LPO1323585 ID : LPO1323592 ID : LPO1323594 Cylindrical shell : (C. Remiro Bellostas (BV PARIS) on 30 Oct 2017 ) It is noted that when calculating the cylindrical shell thickness, the design stress of the shell material has been taken as 270MPa (Value S in page 9/22). According to IGF Code 6.4.15.3.2 For austenitic steels, the allowable stress shall be the minimum between Rm/A and Re/B, where values A and B shall have at least the minimum following values: A=3.5 and B=1.5. As SA-240 304 states mechanical properties: Re0.2%=205MPa and Rm=515MPa, the allowable stress will be 136,66MPa. It means, that you will obtain a required value of cylindrical shell thickness higher than before. Please update the calculation. N 500095-03 0 OUTER TANK ASSEMBLY Accidental conditions : (C. Remiro Bellostas (BV PARIS) on 30 Oct 2017 ) According to IGF Code 6.4.15.3.5.1 the tanks and tank support shall be designed for the accidental loads: collision and flooded compartment causing buoyancy on tank (if tank fitted in fuel storage hold space). - It is understood that 2g has been taken as collision load. Please confirm our understanding or clarify. - Clarify how buoyancy has been considered? or the tank container will be fitted only on open deck? Dished ends : (C. Remiro Bellostas (BV PARIS) on 30 Oct 2017 ) It is noted that when calculating the dished end thickness, the design stress of the head material has been taken as 270MPa (Value S in page 9/22). According to IGF Code 6.4.15.3.2 For austenitic steels, the allowable stress shall be the minimum between Rm/A and Re/B, where values A and B shall have at least the minimum following values: A=3.5 and B=1.5. As SA-240 304 states mechanical properties: Re0.2%=205MPa and Rm=515MPa, the allowable stress will be 136,66MPa. It means, that you will obtain a required value of heads thickness higher than before. Please update the calculation. Page 4/8
Cargo Comments on sets of drawings ID : LPO1325074 N 500095-01 0 GENERAL ARRANGEMENT Design conditions : (C. Remiro Bellostas (BV PARIS) on 02 Nov 2017 ) To be defined: 1- Design life of the tank container. According to IGF Code 6.4.1.3 life of a portable tank container shall not be less than 20 years. Please confirm. 2- Maximum accelerations considered at the centre of gravity of the tank. 3- Maximum internal pressure Peq as defined in IGF Code 6.4.9.3.3.1. Cargo - Comments on drawings Drawing number HT 500095 Rev 0 Holding Time 10bar - 40ft 46000L ID : LPO1325106 ID : LPO1325114 ID : LPO1325216 Damage case : (C. Remiro Bellostas (BV PARIS) on 02 Nov 2017 ) It is noted that the holding time is calculated for normal operation (98% full). Please submit the calculation for damage case (loss of vacuum). Reference pressure : (C. Remiro Bellostas (BV PARIS) on 02 Nov 2017 ) Please clarify: 1- Reference pressure taken in the calculation 2- Starting condition considered in the calculation 3- Ending condition: We understand 11 bar (a) is taken as the setting of the PRVs. Please confirm m and Qt values : (C. Remiro Bellostas (BV PARIS) on 02 Nov 2017 ) Could you please justify the value of Equivalent rate of product loss "m" and "Qt" value? Drawing number 500095-01 Rev 0 Approval stamp : 01b (?) GENERAL ARRANGEMENT ID : LPO1323402 Hydrostatic test pressure : (C. Remiro Bellostas (BV PARIS) on 30 Oct 2017 ) It is noted that the hydrostatic test pressure is indicated at 1460 kpa. According to IGF Code, 16.5.4 type C tanks and another pressure vessels shall be subject to a hydrostic test at pressure measured at the top of the tanks, of not less than 1.5P0. Please correct. Page 5/8
Drawing number 500095-04 Rev 0 Approval stamp : 01b LINE ID : LPO1325066 Pipe stress : (C. Remiro Bellostas (BV PARIS) on 02 Nov 2017 ) Stress analysis of piping with design temperature -110 C or lower remains to be submitted. Drawing number 500095-11 Rev 0 Approval stamp : 01b P&ID PLATE ID : LPO1323438 ID : LPO1323439 Tank valves : (C. Remiro Bellostas (BV PARIS) on 30 Oct 2017 ) According to IGF 9.4.1 Fuel storage tank inlets and outlets shall be provided with valves located as close to the tank as possible. Tank valves whether accessible or not shall be automatically operated when the safety system is activated. Tank valves are V1, V3 and also V8. Please correct or clarify. Tank instrumentation : (C. Remiro Bellostas (BV PARIS) on 30 Oct 2017 ) According to IGF 15.4, Each liquefied gas fuel tank shall be fitted with : 1. a liquid level gauging device(s), arranged to ensure a level reading is always obtainable. We understand that this can be achieved by LG1 level gauge. Please confirm. 2. a high liquid level alarm operating independently of other liquid level indicators and giving an audible and visual warning when activated. 3. An additional sensor operating independently of the high liquid level alarm shall automatically actuate a shutoff valve. We understand that the two level transmitters LT1 and LT2 will operate and trigger high alarm and high high level alarm idependently. Please confirm and clarify which one gives the High Alarm and which one gives the High High Alarm. ID : LPO1323445 Connection to ship control and safety system : (C. Remiro Bellostas (BV PARIS) on 30 Oct 2017 ) According to IGF 6.5.8 Control and monitoring systems for portable fuel tanks shall be integrated in the ship's control and monitoring system. Safety system for portable fuel tanks shall be integrated in the ship's safety system (e.g. shutdown systems for tank valves, leak/gas detection systems). Please clarify how this integration is intended to be done. Drawing number TSCT500095 Rev 0 (?) TECHNICAL SPECIFICATION ID : LPO1323383 2 Tank fittings and Accessories : (C. Remiro Bellostas (BV PARIS) on 30 Oct 2017 ) It is noted in 2 Tank fittings and Accessories that valve types are Stainless steel type approved. Please submit reference of type approvals for all LNG/NG valves. Page 6/8
Drawing number TSCT500095 Rev 0 (?) TECHNICAL SPECIFICATION ID : LPO1325249 Filling and loading limits : (C. Remiro Bellostas (BV PARIS) on 02 Nov 2017 ) Filling and loading limits according to IGF Code 6.8 to be submitted for approval. Drawing number RV 10bar Rev 0 Relief valve sizing ID : LPO1323459 ID : LPO1323490 ID : LPO1323500 ID : LPO1323548 Fire factor F : (C. Remiro Bellostas (BV PARIS) on 30 Oct 2017 ) It is noted that the minimum fire factor F=0.1 has been considered in the calculation. This fire factor can only be taken if the vacuum insulated container is located in a fuel storage hold space, but no if the vacuum insulated tank is located on open deck. Please update the calculation with F=0,5 if the tank is foreseen to be located on open deck. PRVs fitted to fuel tanks are to be type approv... : (C. Remiro Bellostas (BV PARIS) on 30 Oct 2017 ) PRVs fitted to fuel tanks are to be type approved through design assessment and prototype testing in accordance with IGF Code 16.7.1. Please submit reference of PSVs Type Approvals. PBU vapours : (C. Remiro Bellostas (BV PARIS) on 30 Oct 2017 ) A Pressure Build up unit is noted in line J. According to NR529 rev.02 C6.7.3.1.1 the relieving capacity of the PRVs is to be sufficient to discharge the vapours generated by the PBU heat exchanger at its maximum capacity. We can not identify how this has been taken into account in the calculation. Please clarify. Clarification : (C. Remiro Bellostas (BV PARIS) on 30 Oct 2017 ) 1- It is undersood that PSVs calculation has been performed for pure methane (100%CH4). Please confirm. 2- From which standard/encyclopedia the values of enthalpy, etc have been taken? 3- It is noted that k is taken as 2.218. According to IGF Code, k value shall be between 1.0 and 2.2. Please correct. 4- Specify the values: Cp and Cv 5- We understand that value C corresponds to value D in IGF Code. 6- Gas factor G shall be indicated in the calculation. Drawing number 500095-46-10-17-001 Rev 0 46000l 10bar Cryogenic Tank ID : LPO1323406 Stress during hydrostatic test : (C. Remiro Bellostas (BV PARIS) on 30 Oct 2017 ) Determination of stress according to IGF 16.5.4.1 during hydrostatic test to be included to ensure that the calculated primary membrane stress at any point will not exceed 90% of yield strength of the material at the test temperature. Page 7/8
Drawing number 500095-46-10-17-001 Rev 0 46000l 10bar Cryogenic Tank ID : LPO1323593 ID : LPO1323600 Test pressure : (C. Remiro Bellostas (BV PARIS) on 30 Oct 2017 ) It is noted in page 7/22 that P0=1MPa and the required test pressure is 1,43 MPa. However according to IGF Code 16.5.4 hydrostatic test shall not be less than 1,5*P0. Please update the value. Environmental loads : (C. Remiro Bellostas (BV PARIS) on 30 Oct 2017 ) At this moment it is not clear if the LNG tank container is foreseen to be fitted on weather deck or in a fuel storage hold space. To be clarified. 1 - It is noted that wind loads have not been taken into account in the calculation. These loads shall be taken into account for fuel tanks installed on open deck unless justifed (e.g: confirmation of no relevant wind loads in the operating area of the ship). 2 - Green sea loads to be considered unless wave slap is practically impossible (e.g: free height from the ship waterline until the LNG tank or protecting superstructure around the tank). 3 - Snow and ice loads to be also considered for fuel tanks located onboard ships operating in low air temperature. The Non applicability of the a.m. loads is to be justified. Drawing number ML 500095 Rev 0 Cryogenic Multilayer ID : LPO1325105 Application : (C. Remiro Bellostas (BV PARIS) on 02 Nov 2017 ) Please clarify where this cryogenic multilayer is foreseen to be fitted. In vacuum space of the tank? around cryogenic piping? Page 8/8