Kan. Admin. Regs. § 4-10-4d - Pressure-relief valves
(a)
Each container or system of containers shall have liquid and vapor
pressure-relief valves to prevent pressure build-up in any portion of the
system. Each pressure-relief valve shall be manufactured for use with anhydrous
ammonia and be installed, maintained, and replaced according to the
manufacturer's instructions.
(b)
Each vapor-relief valve shall be set to indicate discharge at a pressure of not
less than 95 percent, and not more than 100 percent, of the design pressure of
the container to which the vapor-relief valve is attached. Each vapor-relief
valve shall be constructed to completely discharge before the pressure exceeds
120 percent of the design pressure of the container to which the vapor-relief
valve is attached.
(c)
Pressure-relief valves shall not exhaust within or beneath any building or
other confined area.
(d) Each
pressure-relief valve discharge opening shall have a suitable rain cap or other
device that allows free discharge of the vapor and prevents the entrance of
water.
(e) Each pressure-relief
valve shall be replaced if the valve meets any of the following conditions:
(1) Fails to meet applicable
requirements;
(2) shows evidence of
damage, corrosion, or foreign matter; and
(3) does not have functional weep holes that
permit moisture to escape.
(f) The discharge from each pressure-relief
valve shall be vented according to one of the following:
(1) For vapor-relief valves, upward and away
from where people could be located. The discharge shall flow in an unobstructed
manner into the open air from a height of at least seven feet above the working
area;
(2) for liquid-relief valves,
downward with the opening positioned between six and 18 inches from the ground;
or
(3) in any other manner that has
been approved by the secretary or an authorized representative of the
secretary.
(g)
(1) Vent pipes or tubing used to channel
releases from pressure-relief valves shall not be restricted or smaller in size
than the pressure-relief valve outlet connection.
(2) Vent pipes may be connected and channeled
into a common header if the cross-sectional area of the header is at least
equal to the sum of the cross-sectional areas of each of the individual vent
pipes.
(3) Unless a vent is
directed toward the ground and rain will not be able to enter, each
pressure-relief valve discharge opening shall have a rain cap.
(4) If moisture accumulation could occur in a
vent, suitable provision shall be made to drain the moisture from the
vent.
Notes
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