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IEC60335试验指甲

29 Pressure Vessels and Parts Subject to Pressure . . . . . . . . .  . . . . . . . . . . . . . . . . . . .41
29.1 Except as noted in 29.2, a pressure vessel having an inside diameter of more than 6 inches (152
mm) and subject to a gauge pressure of more than 15 lbf/in2 (103 kN/cm2) shall be certified by the
National Board of Boiler and Pressure-Vessel Inspectors and marked in accordance with the appropriate
boiler and pressure vessel code symbol of the American Society of Mechanical Engineers (ASME) (²H²,
²M², ²S², or ²U²) for a working pressure not less than the pressure determined by applying 29.3.
29.2 If a pressure vessel, because of its application, is not covered under the inspection procedures of
the ASME code, it shall be designed and constructed so that it complies with the requirements in 29.3.
- S1 M& O. X* e$ H: z8 z. q' D29.3 Except as noted in 29.4 and 29.5, a part that is subject to air or vapor pressure (including the vapor
: N: l7 J8 H7 U# Zpressure in a vessel containing only a superheated fluid) during normal or abnormal operation shall
withstand without bursting or leaking a pressure equal to the highest of the following that is applicable:
a) Five times the pressure corresponding to the maximum setting of a pressure-reducing valve
provided as part of the assembly, but no more than five times the marked maximum supply
pressure from an external source and no more than five times the pressure setting of a
pressure-relief device provided as part of the assembly.
b) Five times the marked maximum supply pressure from an external source, except as
! ~5 K! m" Y1 v4 Sprovided in (a).
c) Five times the pressure setting of a pressure-relief device provided as part of the assembly.
+ n; y" }4 N7 P$ ~d) Five times the maximum pressure that can be developed by an air compressor that is part of
9 a3 _/ y, [- H6 J0 z0 S6 Mthe assembly, unless the pressure is limited by a pressure-relief device in accordance with (a).
' A# K% p$ q3 K3 Y1 Qe) Five times the working pressure marked on the part.
29.4 A test need not be performed to determine whether a part complies with the requirement in 29.3 if
& {% F5 d4 |) ?" Ystudy and analysis indicate that the strength of the part is adequate for the purpose as a result of its
material and dimensions – for example, copper or steel pipe of standard size and provided with standard
! a) W( P: N- }6 q: l8 x, b- \' ffittings might be considered to have adequate strength.
. b$ F1 ~1 w7 w6 d" s29.5 A pressure vessel bearing the ASME code inspection symbol (²H², ²M², ²S², or ²U²) is considered
to comply with the requirement in 29.3 if the vessel is marked with a value of working pressure not less
than that to which it is subject during normal or abnormal operation.
29.6 If a test is necessary to determine whether a part complies with the requirement in 29.3, two samples
of the part are to be subjected to a hydrostatic-pressure test. Each sample is to be filled with water as to
exclude air and is to be connected to a hydraulic pump. The pressure is to be raised gradually to the
specified test value and is to be held at that value for 1 minute. The results are not acceptable if either
+ h9 k! K) T) n$ o; n0 u3 [6 Zsample bursts or leaks, except as indicated in 29.7.
29.7 Leakage at a gasket during the hydrostatic-pressure test is not unacceptable unless it occurs at a
pressure 40 percent or less of the required test value.
$ s! z. K$ \! ]) a% t+ Q  m29.8 A means for relieving pressure shall be provided for all parts in which pressure might be generated
4 S) b* @  @) M* g8 Hin the event of fire.
+ l* U, T" o* s* ^" T) f* T29.9 Pressure-relief devices (see 29.15), fusible plugs, soldered joints, nonmetallic tubing, or other
; h) r" r0 {: j% }9 q. ?7 @; L+ a& F# Cpressure-relief means or the equivalent may be employed to comply with the requirements in 29.8.
' a% e6 K9 J2 R+ {, i0 s- M29.10 There shall be no shut-off valve between the pressure-relief means and the parts that it is intended
to protect.
29.11 A vessel having an inside diameter of more than 3 inches (76.2 mm) and subject to air or steam
pressure generated or stored within the appliance shall be protected by a pressure-relief device.
29.12 The start-to-discharge pressure setting of the pressure-relief device shall not be higher than the
working pressure marked on the vessel. The discharge rate of the device shall acceptably relieve the
# ^0 u7 z" w2 qpressure.
29.13 A pressure-relief device shall comply with all four of the following:
$ \7 c) u! C: P7 b' a2 q5 Q% K3 W, va) Shall be connected as close as possible to the pressure vessel or parts of the system that it
is intended to protect;
b) Shall be installed so that it is readily accessible for inspection and repair and cannot be
readily rendered inoperative;
c) Shall have its discharge opening located and directed so that the risk of scalding is reduced
to a minimum; and
d) Shall have its discharge opening located and directed so that operation of the device does
! b  k# d5 w: h3 |not deposit moisture on bare live parts or on insulation or components affected detrimentally by
4 @9 H0 q" w% q+ r( mmoisture.
, l! U, w: r0 O29.14 A pressure-relief device having an adjustable setting shall be judged on the basis of its maximum
setting unless the adjusting means is sealed at a lower setting.
6 _6 ?& k8 g6 u) g29.15 A pressure-relief device is considered to be a pressure-actuated valve or rupture member intended
to relieve excessive pressures automatically.
29.16 Where a pressure relief device is required, the control responsible for limiting the pressure in the
vessel shall be capable of performing under rated load for 100,000 cycles of operation and shall prevent
the pressure from exceeding 90 percent of the relief device setting under any condition of normal
% y3 X9 W/ F% x( ~operation.