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Emergency Relief Manways

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Emergency Relief Manways

CNC 121 Series of Emergency Relief Manways

Emergency Relief Manway

Motherwell Tank Protections CNC 121 Series are manufactured in our UK manufacturing plant to exacting quality standards and backed by over 50 years experience. They are avalaible with a variety of options which include

MTP 121 Series non-sparking emergency relief manhole covers permit access to low pressure storage tanks and provide emergency venting capacity in the event of fire. They are used extensively on bulk storage tanks, including floating roof tanks.

Table 1. Emergency Relief Vent Options


Materials / Options

Size Range

10", 12", 18", 20", 24", 26", 28", 30", 32", 34", 36"

Process Connections

API 650 (20" and 24"), ANSI 150#, Special at no extra cost


Aluminium, Carbon Steel, Stainless Steel, Special

Diaphragm & Insert

PTFE, others available upon request


Lead Plate (standard), Stainless Plate (special)

CNC121/CNC122 Emergency Relief Valve

Emergency Relief Vents

Pressure and Vacuum Emergency ManwayPressure and Vacuum Emergency ManwayAccess ManwayAccess Manway