Section 4 Principles of Manufacture and Construction

401. Treatment

In application to 401. 3 of the Rules, "the requirements separated provided" means the require- ments of 302. of this guidance.

403. Cutout sand viewports(or windows)

In application to 403. 3 of the Rules, the seat dimensions for various complied with the requirements of Table 1.5.1 to 1.5.3.

standard windows shall be

Table 1.5.1 Mechanical, Optical Characteristics for acrylic plastic

Characteristics

Limitation

Test method (ASTM)

Ultimate tensile strength Elongation at break Elastic modulus

≥ 62 NĤmmË

≥ 2 %

≥ 2760 NĤmmË

Ǽ 6381)

Compression yield strength Elastic modulus

≥ 103 NĤmmË

≥ 2760 NĤmmË

Ǽ 695

Compressive deformation subject to 27.7 NĤmmË at 50°C for 24 hours

≤ 1 %

Ǽ 6211)

Ultraviolet rays penetration ratio

≤ 5 %

Á 308

Visual clarity

through acrylic viewport, a letter is to be readable from the distance of l50 ẄŶ away.

Ǽ 702

Total residual monomer Methyl methacrylate Ethyl acrylate

≤ 1.6 %

(Remarks)

1) The mechanical characteristics shall be proved by at least two(2) specimens.

Table 1.5.2 Standard size for rectangular flat viewports(or windows)

Application Minimum thickness : Ź≥ ËËĦÈ mm Thickness Ratio : ŹĤǼŊ ≥ ŊĦËËÈ mm Edge radius : Ë mm≤ ĄË ≤Ë mm Ratio to viewport : ËĦËÈ ≤ ǼŊ ĤǼX ≤ ËĦÈ Maximum operating pressure : Ā ≤ ËĒŊ bar
Design Pressure (ĀẄ)(bar)	Minimum thickness / Inner diameter of seat (ŹĤǼY )
Design Pressure (ĀẄ)(bar)	10°C	24°C	38°C	52°C	66°C
5	0.134	0.146	0.154	0.164	0.188
10	0.154	0.173	0.188	0.201	0.226
15	0.173	0.195	0.210	0.223	0.253
20	0.188	0.210	0.226	0.240	0.281
25	0.201	0.223	0.240	0.257	0.305
30	0.210	0.233	0.253	0.274	0.324
35	0.219	0.243	0.267	0.292	0.344
40	0.226	0.253	0.281	0.305	0.363
45	0.233	0.264	0.295	0.317	0.383
50	0.240	0.274	0.305	0.329	0.402
60	0.253	0.295	0.324	0.354	0.441
70	0.267	0.310	0.344	0.378	0.480
80	0.281	0.324	0.363	0.402	0.520
90	0.295	0.339	0.383	0.427	0.559
100	0.305	0.354	0.402	0.451	0.598
110	0.315	0.368	0.422	0.476	0.637
120	0.324	0.383	0.441	0.500	0.676
130	0.334	0.398	0.461	0.524	0.715
140	0.344	0.412	0.480	0.549	0.754
150	0.354	0.427	0.500	0.573	0.793
160	0.363	0.441	0.520	0.598	0.832
170	0.373	0.456	0.539	0.622	0.871

Guidance Relating to the Rules for the Classification of Underwater Vehicles 2015 13

Table 1.5.3 Standards for spherical shell type viewports(or windows) having conical type seat.

Application Opening angle : Ø ≥ ÈŊU Minimum thickness : Ź≥ ËËĦÈ mm Minimum ratio (ŹĤǼŊ ) - when Ø ≥ ÈŊU, 0.09 - when Ø ≥ ŊŊU, 0.06 Ratio to viewport : ǼY ĤǼX ≥ ËĦŊË Maximum operating pressure : Ā ≤ ËĒŊ bar
Design pressure ĀẄ (bar)	Minimum thickness / inner diameter of seat (ŹĤǼY )
	when Ø = 60°					when Ø = 90°
	10°C	24°C	38°C	52°C	66°C	10°C	24°C	38°C	52°C	66°C
5	0.090	0.090	0.090	0.090	0.090	0.042	0.042	0.042	0.042	0.049
10	0.090	0.090	0.090	0.090	0.112	0.042	0.043	0.049	0.054	0.070
15	0.090	0.090	0.097	0.108	0.140	0.043	0.052	0.060	0.067	0.089
20	0.090	0.097	0.112	0.126	0.166	0.049	0.060	0.070	0.080	0.107
25	0.090	0.108	0.126	0.143	0.191	0.054	0.067	0.080	0.091	0.124
30	0.097	0.119	0.140	0.160	0.215	0.060	0.075	0.089	0.102	0.142
35	0.104	0.129	0.153	0.176	0.238	0.065	0.082	0.098	0.113	0.160
40	0.112	0.140	0.166	0.191	0.259	0.070	0.089	0.107	0.124	0.177
45	0.119	0.150	0.179	0.206	0.279	0.075	0.095	0.116	0.135	0.194
50	0.126	0.160	0.191	0.221	0.298	0.080	0.102	0.124	0.146	0.210
60	0.140	0.179	0.215	0.248	0.332	0.089	0.116	0.142	0.168	0.242
70	0.153	0.197	0.238	0.274	0.363	0.098	0.128	0.160	0.190	0.272
80	0.166	0.215	0.259	0.298	0.391	0.107	0.142	0.177	0.210	0.300
90	0.179	0.232	0.279	0.320	0.416	0.116	0.155	0.194	0.230	0.327
100	0.191	0.248	0.298	0.340	0.439	0.124	0.168	0.210	0.250	0.351
110	0.203	0.264	0.315	0.359	0.460	0.133	0.181	0.226	0.269	0.373
120	0.215	0.279	0.332	0.377	0.480	0.142	0.194	0.242	0.287	0.393
130	0.227	0.293	0.348	0.394		0.151	0.206	0.257	0.304	0.411
140	0.238	0.307	0.363	0.410		0.160	0.218	0.272	0.320
150	0.248	0.320	0.377	0.425		0.168	0.230	0.287	0.336
160	0.259	0.332	0.391	0.439		0.177	0.242	0.300	0.651
170	0.269	0.344	0.404	0.452		0.185	0.254	0.314	0.365

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