16 Tex. Admin. Code § 65.613 - Liquid Pressure Tests
(a) When there
is a question or doubt about the extent of a defect found in a boiler, the
inspector may require a liquid pressure test.
(b) In preparing a boiler for a liquid
pressure test, the boiler shall be filled with water to the stop valve and all
air vented off. If the boiler to be tested is connected with other boilers that
are under pressure, such connections shall be blanked off unless they have
double stop valves on all connection pipes with a drain between.
(c) During a liquid pressure test of a
boiler, the safety valve or valves shall be removed or each valve disc shall be
held to its seat by means of a testing clamp and not by screwing down the
compression screw under the spring.
(d) The metal temperature for the pressure
test shall not be less than 60 degrees Fahrenheit (16 degrees Celsius), unless
the owner provides information on the toughness characteristics of the material
for a lower test temperature, but the maximum metal temperature shall not
exceed 120 degrees Fahrenheit (50 degrees Celsius), unless a higher temperature
is specified and is acceptable to the inspector.
(e) When a liquid pressure test is to be
applied after inspection, the pressure shall be as follows.
(1) For all cases involving the question of
tightness, the pressure shall be no more than the set pressure of the safety
valve or valves having the lowest setting.
(2) For all cases involving the question of
safety, the pressure applied shall not exceed the lesser of that which was
required by the original code of construction, or the pressure equal to that
which results in an applied stress no greater than 90% of the specified minimum
yield stress at test temperature of the material as published by ASME Code,
Section II, Part D, current edition.
(f) A liquid pressure test shall be held for
a minimum of fifteen (15) minutes at the required pressure without
leakage.
(g) The actual pressure in
the boiler shall not exceed 1.5 x MAWP.
Notes
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