Which statement best describes where a hydrostatic relief device is placed in relation to the regulator?

Which statement best describes where a hydrostatic relief device is placed in relation to the regulator?

• A. Upstream of the regulator
• B. Downstream of the regulator
• C. Inside the regulator housing
• D. At the meter

Answer: (A)

Hydrostatic relief devices are placed upstream of the regulator so they can relieve excess pressure before the regulator experiences it. If the upstream line experiences a surge or if the downstream path is blocked (causing a hydrostatic pressure buildup), the relief device vents to the atmosphere, protecting the regulator’s diaphragm and seals from damage. Placing the device downstream of the regulator wouldn’t protect the regulator itself; it would vent after the pressure has already acted on the regulator and could allow overpressure to reach the regulator housing or downstream components. Installing it inside the regulator or at the meter wouldn’t provide the necessary upstream venting path to prevent regulator damage.

Hydrostatic relief devices are placed upstream of the regulator so they can relieve excess pressure before the regulator experiences it. If the upstream line experiences a surge or if the downstream path is blocked (causing a hydrostatic pressure buildup), the relief device vents to the atmosphere, protecting the regulator’s diaphragm and seals from damage. Placing the device downstream of the regulator wouldn’t protect the regulator itself; it would vent after the pressure has already acted on the regulator and could allow overpressure to reach the regulator housing or downstream components. Installing it inside the regulator or at the meter wouldn’t provide the necessary upstream venting path to prevent regulator damage.