如何区分锅炉压力的等级
 
锅炉按其出口蒸汽压力不同可分为以下几类：
（1）低压锅炉出口蒸汽压力小于或等于2.45MPa的锅炉，其蒸汽温度           多为饱和温度或不高于400℃。
（2）中压锅炉出口蒸汽压力为2.94——4.90MPa的锅炉。我国电站锅炉现行的参数系列，中压锅炉出口蒸汽压力规定为3.83MPa，蒸汽温度为450℃。
（3）高压锅炉出口蒸汽压力为7.84—10.8MPa的锅炉。我国电站锅炉现行参数系列，高压锅炉出口蒸汽压力为9.81MPa,出口蒸汽温度多为540℃.
（4）超高压锅炉出口蒸压力为11.8—14.7MPa的锅炉。我国电站锅炉现行参数系列，超高压锅炉出口蒸汽压力规定为13.7MPa，蒸汽出口温度为540℃,少数为555℃.
(5)亚临界压力锅炉出口蒸汽压力为15.7—19.6MPa的锅炉。我国电站锅炉现行参数系列，亚临界压力锅炉出口蒸汽压力规定为16.7MPa，出口蒸汽温度为540℃或555℃,少数为570℃.
(6)超临界压力锅炉出口蒸汽压力超过临界压力的锅炉。水蒸气的临界压力为22.1MPa。目前电站锅炉采用超临界压力多在于25¬——27MPa之间。
  
压力与温度的对照
℃ → MPa
1 → 0.
2 → 0.
3 → 0.
4 → 0.
5 → 0.
6 → 0.
7 → 0.0010021
8 → 0.001073
9 → 0.0011483
10 → 0.0012282
11 → 0.001313
12 → 0.0014028
13 → 0.0014981
14 → 0.001599
15 → 0.0017058
16 → 0.0018188
17 → 0.0019384
18 → 0.0020647
19 → 0.0021983
20 → 0.0023393
21 → 0.0024882
22 → 0.0026453
23 → 0.0028111
24 → 0.0029858
25 → 0.0031699
26 → 0.0033639
27 → 0.0035681
28 → 0.0037831
29 → 0.0040092
30 → 0.004247
31 → 0.0044969
32 → 0.0047596
33 → 0.0050354
34 → 0.0053251
35 → 0.005629
36 → 0.0059479
37 → 0.0062823
38 → 0.0066328
39 → 0.0070002
40 → 0.0073849
41 → 0.0077878
42 → 0.0082096
43 → 0.0086508
44 → 0.0091124
45 → 0.009595
46 → 0.010099
47 → 0.010627
48 → 0.011177
49 → 0.011752
50 → 0.012352
51 → 0.012978
52 → 0.013631
53 → 0.014312
54 → 0.015022
55 → 0.015762
56 → 0.016533
57 → 0.017336
58 → 0.018171
59 → 0.019041
60 → 0.019946
61 → 0.020888
62 → 0.021867
63 → 0.022885
64 → 0.023943
65 → 0.025042
66 → 0.026183
67 → 0.027368
68 → 0.028599
69 → 0.029876
70 → 0.031201
71 → 0.032575
72 → 0.034
73 → 0.035478
74 → 0.037009
75 → 0.038595
76 → 0.040239
77 → 0.041941
78 → 0.043703
79 → 0.045527
80 → 0.047414
81 → 0.049367
82 → 0.051387
83 → 0.053476
84 → 0.055635
85 → 0.057867
86 → 0.060173
87 → 0.062556
88 → 0.065017
89 → 0.067558
90 → 0.070182
91 → 0.07289
92 → 0.075684
93 → 0.078568
94 → 0.081541
95 → 0.084608
96 → 0.087771
97 → 0.09103
98 → 0.09439
99 → 0.097852
100 → 0.10142
101 → 0.10509
102 → 0.10887
103 → 0.11277
104 → 0.11678
105 → 0.1209
106 → 0.12515
107 → 0.12952
108 → 0.13401
109 → 0.13863
110 → 0.14338
111 → 0.14826
112 → 0.15328
113 → 0.15844
114 → 0.16374
115 → 0.16918
116 → 0.17477
117 → 0.18052
118 → 0.18641
119 → 0.19246
120 → 0.19867
121 → 0.20505
122 → 0.21159
123 → 0.2183
124 → 0.22518
125 → 0.23224
126 → 0.23947
127 → 0.24689
128 → 0.2545
129 → 0.26229
130 → 0.27028
131 → 0.27846
132 → 0.28685
133 → 0.29543
134 → 0.30423
135 → 0.31323
136 → 0.32245
137 → 0.33188
138 → 0.34154
139 → 0.35143
140 → 0.36154
141 → 0.37189
142 → 0.38247
143 → 0.39329
144 → 0.40437
145 → 0.41568
146 → 0.42726
147 → 0.43909
148 → 0.45118
149 → 0.46354
150 → 0.47616
151 → 0.48907
152 → 0.50225
153 → 0.51571
154 → 0.52946
155 → 0.5435
156 → 0.55784
157 → 0.57247
158 → 0.58742
159 → 0.60267
160 → 0.61823
161 → 0.63412
162 → 0.65033
163 → 0.66686
164 → 0.68373
165 → 0.70093
166 → 0.71848
167 → 0.73638
168 → 0.75462
169 → 0.77322
170 → 0.79219
171 → 0.81152
172 → 0.83122
173 → 0.8513
174 → 0.87176
175 → 0.8926
176 → 0.91384
177 → 0.93547
178 → 0.95751
179 → 0.97995
180 → 1.0028
181 → 1.0261
182 → 1.0498
183 → 1.0739
184 → 1.0985
185 → 1.1235
186 → 1.1489
187 → 1.1748
188 → 1.2011
189 → 1.228
190 → 1.2552
191 → 1.283
192 → 1.3112
193 → 1.3399
194 → 1.3691
195 → 1.3988
196 → 1.429
197 → 1.4597
198 → 1.4909
199 → 1.5227
200 → 1.5549
201 → 1.5877
202 → 1.621
203 → 1.6549
204 → 1.6893
205 → 1.7243
206 → 1.7598
207 → 1.7959
208 → 1.8326
209 → 1.8698
210 → 1.9077
211 → 1.9461
212 → 1.9851
213 → 2.0247
214 → 2.065
215 → 2.1058
216 → 2.1473
217 → 2.1894
218 → 2.2322
219 → 2.2756
220 → 2.3196
221 → 2.3643
222 → 2.4096
223 → 2.4556
224 → 2.5023
225 → 2.5497
226 → 2.5978
227 → 2.6466
228 → 2.696
229 → 2.7462
230 → 2.7971
231 → 2.8487
232 → 2.901
233 → 2.9541
234 → 3.008
235 → 3.0625
236 → 3.1179
237 → 3.174
238 → 3.2308
239 → 3.2885
240 → 3.3469
241 → 3.4062
242 → 3.4662
243 → 3.527
244 → 3.5887
245 → 3.6512
246 → 3.7145
247 → 3.7786
248 → 3.8436
249 → 3.9095
250 → 3.9762
251 → 4.0438
252 → 4.1122
253 → 4.1815
254 → 4.2518
255 → 4.3229
256 → 4.3949
257 → 4.4679
258 → 4.5417
259 → 4.6165
260 → 4.6923
261 → 4.7689
262 → 4.8466
263 → 4.9252
264 → 5.0047
265 → 5.0853
266 → 5.1668
267 → 5.2494
268 → 5.3329
269 → 5.4174
270 → 5.503
271 → 5.5896
272 → 5.6772
273 → 5.7659
274 → 5.8556
275 → 5.9464
276 → 6.0383
277 → 6.1312
278 → 6.2252
279 → 6.3203
280 → 6.4166
281 → 6.5139
282 → 6.6124
283 → 6.712
284 → 6.8128
285 → 6.9147
286 → 7.0177
287 → 7.122
288 → 7.2274
289 → 7.334
290 → 7.4418
291 → 7.5508
292 → 7.661
293 → 7.7725
294 → 7.8852
295 → 7.9991
296 → 8.1143
297 → 8.2308
298 → 8.3485
299 → 8.4676
300 → 8.5879
301 → 8.7095
302 → 8.8325
303 → 8.9568
304 → 9.0824
305 → 9.2094
306 → 9.3378
307 → 9.4675
308 → 9.5986
309 → 9.7311
310 → 9.8651
311 → 10
312 → 10.137
313 → 10.275
314 → 10.415
315 → 10.556
316 → 10.699
317 → 10.843
318 → 10.989
319 → 11.136
320 → 11.284
321 → 11.434
322 → 11.586
323 → 11.74
324 → 11.895
325 → 12.051
326 → 12.209
327 → 12.369
328 → 12.53
329 → 12.693
330 → 12.858
331 → 13.024
332 → 13.193
333 → 13.362
334 → 13.534
335 → 13.707
336 → 13.882
337 → 14.059
338 → 14.238
339 → 14.418
340 → 14.601
341 → 14.785
342 → 14.971
343 → 15.159
344 → 15.349
345 → 15.541
346 → 15.734
347 → 15.93
348 → 16.128
349 → 16.328
350 → 16.529