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Facility Design Guidelines - Facilities Management - University of ...

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steam. Valves for MTHW shall be adequate for 250 psig and 400 degrees water. Globe<br />

valves can be used for throttling. Gate valves shall not be used.<br />

Acceptable manufacturers for high performance ball and butterfly valves are Adams,<br />

Bray, Jamesbury, and Zwick.<br />

The shut <strong>of</strong>f valves just downstream <strong>of</strong> the first stage PRV’s and the pipe up to them,<br />

shall comply with the above construction.<br />

Valves for MPS shall be rated for 200 psig saturated steam.<br />

All sizes <strong>of</strong> butterfly valves on all steam pressures shall have gear operators.<br />

BSRV 4.3.3.2 STEAM SYSTEMS<br />

Steam Pressure Reducing Valves (PRV) shall be cast steel. Spence, Sarco, and Armstrong<br />

are acceptable manufacturers for steam PRVs. The first stage PRVs shall be class 300.<br />

Elbows (45 or 90) shall be provided between each PRV and one <strong>of</strong> the headers to allow<br />

for thermal contraction that occurs when a PRV is removed for service.<br />

Steam strainers shall be installed horizontally so condensate does not collect in them.<br />

Inverted bucket traps shall not be used. F&T traps are preferred for equipment loads<br />

and drip on LPS and MPS. Bimetallic traps are preferred for drip on HPS.<br />

Equipment traps shall have bypasses; drip traps shall not.<br />

Provide ¼” test ports with ball valves just upstream <strong>of</strong> the check valve after all steam<br />

traps. Provide a DDC temperature sensor on the condensate line downstream <strong>of</strong><br />

equipment traps and program to alarm on detection <strong>of</strong> live steam or sub cooled<br />

condensate.<br />

Specify pressure powered condensate pumps rather than electric. Pressure powered<br />

pumps shall be sized to operate with medium pressure steam. Electric condensate<br />

pumps where used shall be on emergency power.<br />

All steam condensate lines shall be schedule 80 and all fittings on condensate lines shall<br />

be class 300.<br />

BSRV 4.3.3.3 HEAT EXCHANGERS<br />

All MTHW to LTHW converters and steam to LTHW converters shall have 90/10<br />

copper/nickel tubes and brass tube sheets. Baffles, where used, shall be Teflon. In<br />

MTHW to LTHW heat exchangers the MTHW shall be in the tubes. Provide pressure<br />

gauges on all four legs <strong>of</strong> heat exchangers.<br />

BSRV 4 HEATING, VENTILATION, AND AIR CONDITIONING 190

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