Aluminum Petroleum Manhole Assembiles

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Description

product presentation:
1) Manhole Cover is equipped on the top of tank truck. 2) It is the entrance of fluid transfer operation inspection and maintaining the inside tank. It can protect the tank when involving in an emergency. 3) Under normal practice, vent is closed When loading and unloading and temperature variation, it will cause the pressure variation inside the tank, such as air pressure and negative vacuum pressure, the vent of manhole cover will be closed automatically in order to keep the tank under a normal pressure. 4) When involving in emergency, such as a car accident, the Emergency Exhaust Valve will open the inside tank, meets the setting, in order to prevent explosion.

Standard:
Meet the NTTC DOT406 Standard
Meet the International GB18564.1 Standard

Materials：
Lever, Cover & Weld Ring: galvanized seel
Emergency Exhaust Valve Aluminum Alloy
Seal Ring：：Nitrile or fluoro
Features：
 The emergency vent cover be compressed in eccentric way to avoid accidents due to overpress
 Vent with spring can open automatically, which meet NTTC DOT406, can avoid the explosion effectively。
 Automatic sealing of the P/V vent in a roll over situation prevents dangerous and costly spillage.
 Two-stage opening allows safe release of residual compartment pressure before fully opening the fill cap.
 250mm(10)fill hole for easy drop pipe insertion when top loading.

Technique Specification：
 Setting pressure of vent discharge：6~8kpa
 Negative opening pressure：-2~-3kpa
 Setting pressure of emergency exhaust valve：23~26kpa
 Pressure resistance：0.254Mpa

Order Specification：

Item No	Product	D	B	Vent Hole D	Probe Hole B	Install Hole
Item No	Product	Vent Hole	Probe Hole	带闷盖	带闷盖	Diameter mm
F-20L-702-9.5	Flanged 20''2 holes aluminum alloy manhole	Yes	Yes	--	--	∅9.5
F-20L-702-AoBo-9.5	Flanged 20''2 holes aluminum alloy manhole	Yes	Yes	Yes	Yes	∅9.5
F-20L-702-Bo-9.5	Flanged 20''2 holes aluminum alloy manhole	Yes	Yes	--	--	∅9.5
F-20L-702-AoBo-11.5	Flanged 20''2 holes aluminum alloy manhole	Yes	Yes	Yes	Yes	∅11.5
F-20L-701-9.5	Flanged 20''1 holes aluminum alloy manhole	Yes	--	--	--	∅9.5
F-20L-701-11.5	Flanged 20''1 holes aluminum alloy manhole	Yes	--	--	--	∅11.5
F-20L-700-11.5	Flanged 20''0 holes aluminum alloy manhole	--	--	--	--	∅11.5