F-20L-702 Aluminum Manhole Covers are manhole covers which are equipped on the top of tank truck.
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.
5) It is internationally accepted, and specified, by oil companies around the world to assist with the safe transportation of petroleum based products.
6) Features Benefits:
a. Material: Casting Aluminum
b. Pressure and vacuum vent fitted as standard for tank breathing.
c. Various ratings are available to suit operational requirements.
d. Spring-loaded fill cap provides emergency fire engulfment venting to NTTC DOT 406, required in the event of the tank being exposed to a fire.
e. Automatic sealing of the P/V vent in a roll over situation prevents dangerous and costly spillage.
f. Aluminium cover arm is also available on some variants.
g. Two-stage opening allows safe release of residual compartment pressure before fully opening the fill cap.
h. 250mm(10½)fill hole for easy drop pipe insertion when top loading.
i. High quality of baseplate and component materials, to international standards, are used for durability and performance.
j. Especially, theft-proof sensor of Aluminum Alloy baseplate for Manhole Assemblies is available.
7) Technique Specification:
a. Setting pressure of vent discharge : 7.14Kpa
b. Negative opening pressure:-2Kpa~-3Kpa
c. Setting pressure of emergency exhaust valve: 0.0266Mpa±0.001Mpa
d. Pressure resistance:0.254Mpa
e. Metting EN 13317:2002 Standard
