Breathing Air - h3010v20235

DOE-HDBK-3010-94

Appendix B; Production Support Lab

Filtered air is drawn into one of two air compressors (on-line and standby units) rated for

200 scfm and 100 psig discharge pressure. The compressor outlet passes through drying

towers to one of two surge receivers. Downstream of the receivers, reducing valves are used

to provide two independent 60 psig instrument air lines.

3.1.5.11 B reath in g A ir

As in the case of process and instrument air, filtered breathing air is drawn into one of two

redundant compressors and discharged to receiving tanks. Maximum flowrates and pressures

are 450 scfm and 115 psig. A low-pressure alarm is provided on the receiving tank which

allows 5 minutes of breathing air for eight people to exit from any ongoing jobs.

Downstream of the receiving tanks, supplied breathing air passes through two stages of

cellulose fiber filters that remove particles greater than 20 m in diameter. Reducing valves

maintain a pressure of 30 psig on the system, which serves sets of manifolds in all of the

operating and maintenance areas. A monitoring system is provided inline with the main

header, which measures temperature, pressure, and O2, CO2, and H2O concentration levels.

An alarm is provided when one of these parameters goes out of a specified band. All alarms

on the system are received in the control room and at individual manifold stations.

3.1.5.12 S team an d C on d en s ate S ystem

Steam is received from the site boilerhouse via a 150-psig main. Before entry into the

building, it is reduced in pressure to 60 psig. Steam branch lines for use in the facility are

reduced to a nominal pressure of 35 psig.

Steam is used as an energy supply for the hot water and building heating systems. General

building use steam condensate is collected in tanks in the utility area and pumped back to the

boilerhouse.

3.1.5.13 D om estic W ater

The domestic cold water main is supplied from site utilities and is equipped with multiple

redundant backflow preventers at various points in the system. One branch serves general

building needs, a second serves utility needs, and a third serves process needs. The first two

branches are disposed of through the sewage system.

The process water branch consists of three separate headers. The first provides water to

safety showers in the operating and maintenance rooms. The second provides water to

analytical room sinks. The third provides cooling water needed by analytical instruments.

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