Page 198 - Estimators Piping Man Hour Manual

Section Four—MECHANICAL INSTRUMENTATION 181

RELIEF VALVES

MAN HOURS EACH

Size Man Hour
TVpe Inches Each
A l /i X 1 0.9
A %x 1 1.0
A Ix 1 1.0
B '/2X 1 0.9
13 % X 1 1.0
B 1x1 1.0

Type A: Screwed relief valve, carbon steel body, carbon steel spring, pressure limit 2,000#, maximum temperature
600° F.
Type B: Screwed relief valve, carbon steel body, alloy steel spring, pressure limit 2,000#, maximum temperature
750° F.
Mart hours include checking out of storage, hauling to erection site, installing, testing, and checking.
Man hours do not include piping to or from the valve or supports if required. See other piping tables for these
requirements.