Emerson ACE95Jr Datový list stáhnout pdf (Strana 4)

Bulletin 74.1:ACE95JR

BLANKETING GAS

SUPPLY LINE

LINE STRAINER

SHUTOFF

VALVE

SENSING

LINE

SHUTOFF

VALVE

SHUTOFF

VALVE

TYPE 252

INLET

FILTER

EMERGENCY

TANK VENT

BLANKETING GAS

TO TANK

TANK VENT

TANK

LIQUID

BLANKETING GAS/VAPOR SPACE

TYPE ACE95jr

Figure 3. Type ACE95jr Tank Blanketing Valve Installation

When installing Type ACE95jr, the sensing line and gas-

to-tank line must always be above the tank liquid level and

should slope down towards the tank without any traps to

avoid catching of liquid. Inlet supply line may be installed

with a  lter and the outlet piping should be full-sized and

self draining to the tank and also valves and vents must be

full line size and should be mounted above the tank.

Sizing Methods

Direct Displacement

Use the direct displacement method with extreme

caution. The direct displacement method determines the

amount of blanketing gas required to replace liquid pumped

out of the tank. Direct displacement does not account for

 uctuating temperature or other factors that may affect

pressure in the vapor space. This method is typically

applied to tanks operating at constant temperatures and

containing non- ammable, non-volatile products.

total

= Q

pump

where,

total

= Required Flow Rate

pump

= Required Flow Rate to replace pumped

out liquid from Table 2

API 2000

The American Petroleum Institute Standard 2000

(API 2000) sizing criteria accounts for liquid pump out as

well as contraction of tank vapors due to cooling. When

using API methods:

total

= Q

pump

thermal

where,

total

= Required Flow Rate

pump

= Required Flow Rate to replace pumped

out liquid from Table 2

thermal

= Required Flow Rate due to thermal

cooling. See Thermal Equations 1

through 4

1 2 3 4 5 6 7 8

Bulletin 74.1:ACE95JR 1

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