Pressure gauges shall have safety glass or plastic lens […]
Pressure gauges shall have safety glass or plastic lenses. Lenses are to be compatible with the surrounding environment (temperature limitations or resistance to attack from fluids or vapours).
Pressure gauges shall have blowout protection, and weatherproof, corrosion resistant cases. Comment: Blowout protection prevents release of any process material out the case front or face.
Pigtails or siphons shall be used in steam and other high temperature condensable vapour services.