Missouri Code of State Regulations
Title 11 - DEPARTMENT OF PUBLIC SAFETY
Division 40 - Division of Fire Safety
Chapter 2 - Boiler and Pressure Vessel Safety Rules
Section 11 CSR 40-2.050 - Pressure Vessels
Universal Citation: 11 MO Code of State Regs 40-2.050
Current through Register Vol. 49, No. 18, September 16, 2024
PURPOSE: This rule is to address the design, construction, installation and operation of pressure vessels.
(1) As used in this rule, the term "these rules" is intended to mean 11 CSR 40-2.010 through 11 CSR 40-2.065.
(2) Pressure vessels installed or contracted for, prior to November 12, 1986.
(A) The
service life of any pressure vessel of standard construction shall be unlimited
provided it meets the inspection requirement of
11 CSR
40-2.022.
(B) The service life of any nonstandard
pressure vessel shall be thirty (30) years. The thirty (30)-year life may be
extended with the chief inspector's approval and compliance with the following
requirements:
1. The operating pressure
cannot exceed the maximum allowable working pressure (MAWP). The pressure
vessel MAWP shall be calculated in accordance with the American Society of
Mechanical Engineers (ASME) Section VIII Code or to the requirements of the
original code of construction. Objects manufactured to a standard other than
the ASME Code shall be evaluated in accordance with the "state special"
requirements of
11 CSR
40-2.064. The allowable stress shall be no greater
than twenty-two percent (22%) of the tensile strength of the material. If the
tensile strength is unknown, an allowable stress of twelve thousand (12,000)
pounds per square inch (psi) shall be used. The joint efficiency shall be in
accordance with the following for welded and brazed joints;
A. Single lap weld = 0.4
B. Double lap weld = 0.5
C. Single butt weld = 0.6
D. Forge welded = 0.7
E. Brazed (steel) = 0.8
F. Seamless = 0.85 unless radiography of all
butt welds is performed
G. Seamless
= 1.0 if radiography of butt welds is performed
H. Riveted = use the appropriate ASME Code or
the National Board Inspection Code (NBIC) rules.
2. The pressure vessel shall be
tested every six (6) years at normal operating pressure not to exceed the MAWP
of the pressure vessel. The pressure test shall be held for at least thirty
(30) minutes and documented to the satisfaction of the inspector. An inspector
need not witness the test. Any leaks shall be repaired prior to restoring the
object to service.
3. All safety
devices and controls required by the ASME Code and these rules shall be
installed and operable.
(3) Pressure vessels installed or contracted for after November 12, 1986.
(A) New and
second hand pressure vessels shall be designed, fabricated and installed in
accordance with the ASME Code and these rules.
(B) Reinstalled pressure vessels may be of
standard or nonstandard construction and shall be installed in accordance with
the requirements of the ASME Code and these rules. Approval of the chief
inspector shall be obtained prior to reinstalling a nonstandard pressure
vessel.
(4) General Requirements for Pressure Vessels.
(A) All
pressure vessels shall be equipped with pressure relief devices in accordance
with their code of construction. In cases where the original code of
construction does not address pressure relief devices, such devices shall be
installed in accordance with the most applicable ASME Code.
(B) Each pressure vessel shall be safely
supported. There shall be no excessive vibration in either the pressure vessel
or the connecting piping.
(C)
Pressure vessels shall have adequate clearance on all sides and top to
facilitate repair, maintenance and inspection. Manufacturer's recommendations,
when provided, shall be followed.
(D) Code nameplates shall remain readily
accessible at all times. Loose or missing nameplates shall be replaced or
reattached as provided for in the National Board
InspectionCode.
(E) Rental
pressure vessels used for temporary service shall meet all of the requirements
of these rules.
*Original authority: 650.215, RSMo 1984, amended 1990, 1993, 1995.
Disclaimer: These regulations may not be the most recent version. Missouri may have more current or accurate information. We make no warranties or guarantees about the accuracy, completeness, or adequacy of the information contained on this site or the information linked to on the state site. Please check official sources.
This site is protected by reCAPTCHA and the Google
Privacy Policy and
Terms of Service apply.
