15 Miss. Code. R. 10-76-3.1.1 - High Temperature Water Boilers - Age Limit of Existing Boilers
1. The age limit of any boiler of nonstandard
construction, installed prior to August 6, 1975, shall be 30 years except that,
after a thorough internal and external inspection, and a hydrostatic pressure
test of 1 1/2 times these allowable working pressure and held for a period of
at least 30 minutes, during which time no distress or leakage develops, any
boiler having other than a riveted, longitudinal, lap joint may be continued in
operation without reduction in working pressure. The age limit of any boiler
having riveted, longitudinal, lap joints and operating at a pressure in excess
of 50 psi shall be 20 years. This type of boiler, when removed from an existing
setting, shall not be installed for a pressure in excess of 15 psig. A
reasonable time for replacement, not to exceed one year, may be given at the
discretion of the Chief Inspector.
2. The shell or drum of a boiler in which a
typical "lap seam crack" is discovered along a longitudinal riveted joint for
either butt or lap joints shall be permanently discontinued for use under steam
pressure. By "lap seam crack" is meant the typical crack frequently found in
lap joints extending parallel to the longitudinal joint and located either
between or adjacent to rivet holes.
3. The age limit of boilers of standard
construction, installed prior to August 6, 1975, shall be determined from the
results of a thorough internal and external inspection by an authorized
inspector and the application of an appropriate pressure test. Hydrostatic test
pressure shall be at 1 1/2 times the allowable working pressure and maintained
for 30 minutes. The boiler may be continued in service at the same working
pressure provided there is no evidence of leakage or distress under these test
conditions.
4. The phenomenon of
brittle fracture may result from stresses imposed during hydrostatic testing
below the Nil-Ductility Transition Temperature of the materials. Where such
data is unavailable on site, it is suggested that the manufacturer be contacted
for the recommended minimum temperature to be used during hydrostatic
testing.
Notes
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