CNC 121 Series of Emergency Relief Manways

Emergency Relief Manways

Motherwell Tank Protection CNC 121 Series are manufactured in our UK manufacturing plant to exacting quality standards and backed by over 40 years experience. They are avalaible with a variety of options which include

Sizes range from 10″ (250mm) to 36″ (900mm).
Made from Carbon Steel and Stainless Steel, Aluminium covers also available
Manufactured to clients flange requirements
Non flanged option available
All manways are set and tested to the clients requirement up to 90Mbarg
Various designs available to suit your requirements

CNC 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
Description	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
Materials	Aluminium, Cast Iron, Carbon Steel, Stainless Steel, Special
Diaphragm & Insert	PTFE
Weights	Lead Plate (standard), Stainless Plate (special)