base for the packing material. Packing glands shall be furnished with a
liner of noncorrosive material and shall be of one piece construction with
provisions for not less than two bolts for packing adjustment.
2.7
STEAM TRAPS
**************************************************************************
NOTE: The following paragraphs are applicable to
steam systems only. Only these two types will be
used. Delete these paragraphs when the distribution
system is not a steam system.
A schedule of steam trap selection will be shown on
the drawings. Trap capacity (kg per second (pounds
per hour)) during normal operation, pressure drop
(kPa (psi)), and pressure rating (kPa (psi)) of each
trap will be included in this schedule. Also, show
on the drawings a vent valve or test valve
connection downstream of traps for test of trap
operation, a strainer ahead of traps, a union, a
check valve in the outlet piping, and shut-off
valves on both sides of trap for trap changeout. A
means of bypassing the trap shall be provided for
system warm-up.
**************************************************************************
Class of trap bodies shall be suitable for a working pressure of not less
than 1.5 times the steam supply pressure, but not less than 1379 kPa 200 psi,
and traps shall be capable of operation under a steam-supply pressure as
indicated. Traps shall have capacities as shown when operating under the
specified working conditions. Traps shall fail open.
2.7.1
Bucket Traps
Bucket traps shall be inverted-bucket type with automatic air discharge and
conform to ASTM F 1139.
2.7.2
Thermostatic Traps
**************************************************************************
NOTE: Specify thermostatic traps where the trap
location is subject to freezing.
**************************************************************************
Traps shall be thermostatic type; bimetallic element with automatic air
discharge and conform to ASTM F 1139.
2.8
STRAINERS
**************************************************************************
NOTE: Delete this paragraph for high temperature
water systems.
**************************************************************************
Strainers shall be basket or y-type with connections the same size as the
pipe lines in which the connections are installed. The strainer bodies for
steam systems shall be heavy and durable, of cast steel, with bottoms
drilled and plugged. The strainers shall be suitable for the temperature
and pressure requirements of the system on which they are installed. The
SECTION 02560
Page 14
Previous Page
