LR IV.1 Required Information and Plans

LR IV.1 In addition to the plans required by the Rules for Ships, the following information and plans are to be submitted, where applicable:

• Full particulars of the intended cargo, or cargoes, including maximum vapour pressures, minimum and (where necessary) maximum liquid temperature and other relevant design conditions.
• General arrangement showing location of cargo tanks and the relative location of fuel oil, water ballast and other tanks.
• Openings in main deck.
• Location of void spaces and dangerous zones – openings and access arrangements.
• Details of hull structure in way of cargo tanks, including support arrangements for tanks and associated pipes and fittings, deck sealing arrangements, etc.
• Distribution of quality and grade of steel, supported by calculations of the determined hull steel temperature. The steel grade and temperature in regions where cold spots are likely to occur (e.g. pump supports and where pipes pass through the deck) are also to be indicated.
• Scantlings, materials, and arrangements of the cargo containment system, including primary and (where fitted) secondary barriers, keying and support arrangements, and attachments of fittings, piping, etc.
• Ladders, suction supports and towers inside cargo tanks (arrangements, materials and loadings).
• Tank dome plans.
• End coamings around dome.
• Particulars of filling, discharging, venting, relieving and inerting arrangements.
• Details of test procedures.
• Temperature control arrangements.
• Such information and data as may be required to enable analysis of the hull and containment system structure to be carried out by direct calculation methods.
• Details of personnel protection equipment to be included on the safety plan as applicable to the ship.
• Assumptions and details of direct calculations procedures used in the structural analysis of the hull. See also LR 3.21-05 and LR 3.21.06.
• Where horizontal and vertical girders are used to support the bulkhead, the bulkhead scantlings may be determined using direct calculation procedures. The assumptions made and the calculations are to be submitted.

The following plans and particulars for type C independent tanks are to be submitted for approval before construction is commenced:

• Nature of cargoes, together with maximum vapour pressures and minimum liquid temperature for which the pressure vessels are to be approved, and proposed hydraulic test pressure.
• Particulars of materials proposed for the construction of the vessels.
• Particulars of refrigeration equipment.
• General arrangement plan showing location of pressure vessels in the ship.
• Plans of pressure vessels showing attachments, openings, dimensions, details of welded joints and particulars of proposed stress relief heat treatment.
• Plans of seating, securing arrangements and deck sealing arrangements.
• Plans showing arrangement of mountings, level gauges and number, type and size of safety valves.

Details of the arrangements proposed to ensure that the tank or cargo temperature cannot be lowered below the minimum design temperature required by 4.1.3.

Plans showing filling, discharging, venting and inerting pipe arrangements, together with particulars of the intended cargo, maximum vapour pressure and minimum liquid temperature.

When partial filling of tanks is contemplated for seagoing conditions an assessment of the tank boundaries is to be made. Details of calculations and/or model tests are required.

Allowable stresses of any materials not covered by Chapter 6 required by 4.18.1.5.

Details verifying compliance with the periodical examination of the secondary barrier required by 4.5 if applicable.

Details of the heating system of the hull structure required by 4.19.1.5 and 4.19.1.6 if fitted.

For the acceptance of increased filling limit as per 15.4, submission of detailed documentation to demonstrate compliance with requirements as indicated in 15.4.1 or suitable equivalent arrangements.

A document specifying the maximum allowable loading limits for each cargo tank and product, at each applicable loading temperature and maximum reference temperature, is to be submitted for approval in accordance with 15.6.1 of the Code where LR is acting on behalf of the Administration. The pressures at which the pressure relief valves (PRVs) have been set, shall also be stated in the document in accordance with 15.6.2 of the Code.

The cargo system operation manuals are to be submitted for approval in accordance with 18.2.1 of the Code where LR is acting on behalf of the Administration.

Specification and plans of the containment system are to be submitted for approval. Plans are to include:

• Details of insulation material and if used any adhesive, sealers, coatings or similar products.
• Details of non-metallic materials.
• Details of insulation arrangement.
• Internal bearers or steelwork.
• Tank supports, chocks, etc.
• Hatch trunks.
• Attachment and support of insulation and linings.
• Data and information to enable a heat leakage calculation to be carried out to assess the capacity of the arrangements provided to deal with boil-off including:

Thermal conductivity of insulation between upper ambient and design temperatures.

Details of reliquefaction/refrigeration plant duty or maximum allowable boil-off rate for each cargo.

• The proposed procedure for fabrication, storage, handling, erection, quality control and control against harmful exposure to sunlight of insulation materials.
• Calculations and/or analysis of strength of insulation where it is subjected to high mechanical or thermal loads.
• Fatigue and crack propagation properties for insulation in membrane systems is also to be submitted.

Specifications of the containment system items are to include both those applicable to initial approval of the material, and those applicable to subsequent delivery of batches of material.

Plans illustrating the means of protection for the ship steelwork, e.g. drip trays, cladding, etc. at loading manifolds; deck tanks, cargo handling system, etc.