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Bulletin 74.1:Y690A

3. Add the requirements of 1 and 2 and select

regulator size, based on total capacity required

from Table 9 or 10.

Sample sizing problem for blanketing applications:

Vessel Capacity . . . . . . . . . . . . 12 500 gallons (47 318 l)

Pump In/Out Capacity . . . . . . . . . 120 GPM (454 l/min)

Inlet Pressure Source . . . . . . . 60 psig (4,1 bar) Nitrogen

Desired Blanket Setpoint . . . . . . 3.0-inches w.c. (7 mbar)

1. From Table 8, the desired air ow rate due to

pump out equals 120 GPM (454 l/min) x 8.021

= 963 SCFH (25,8 Nm³/h) air.

2. From Table 6, interpolate to determine the

required air ow due to thermal cooling

= 300 SCFH (8,0 Nm³/h) air.

3. Total ow required for pump out and thermal cooling

is 963 + 300 = 1263 SCFH (33,8 Nm³/h) air.

4. Convert to nitrogen by dividing the total air ow by

the square root of the specic gravity of nitrogen:

1263 divided by square root of 0.97 = 1282 SCFH

(34,4 Nm³/h) nitrogen.

5. From Table 9, an NPS 1 (DN 25) body size

Type Y690A with a 1/4-inch (6,4 mm) orice will

ow 1323 SCFH (35,5 Nm³/h) nitrogen at 60 psig

(4,1 bar) inlet pressure. This will satisfy the

required ow of 1282 SCFH (34,4 Nm³/h) nitrogen.

Installation

Types Y690A and Y690AH

Install the regulator with the spring case barrel pointed

down. This will assure that the lowest set pressure

shown in Table 5 is achieved. Flow through the

regulator body is indicated by the ow arrow cast on

the body. If a block valve is required, install a full ow

valve between the regulator and the blanketed vessel.

Types Y690AM and Y690AHM

The regulator may be installed in any position as

long as the ow through the body is in the direction

indicated by the ow arrow attached to the body. Install

the regulator as close as possible to the blanketed

vessel using a straight run of pipe the same size as

or larger than the regulator body. Position the body

and/or diaphragm spring case so it will not collect

moisture or debris into the screened vent and also be

self draining (as shown in Figure 4). If a block valve is

required, install a full ow valve between the regulator

and the blanketed vessel.

Attach a downstream pressure control line to the

1/2 NPT connection in the lower diaphragm case.

Connect the other end of the control line to the vessel.

To allow for self-drainage, install the control line at an

angle so that any liquid material will drain away from

the regulator. See Figures 2 and 4 for the location

of the external control line connection. External

dimensions and connections are shown in Figure 5.

Universal NACE Compliance

Optional materials are available for applications

handling sour gases. These constructions comply

with the recommendations of National Association of

Corrosion Engineers (NACE) sour service standards.

The manufacturing processes and materials used

by Emerson assure that all products specied for

sour gas service comply with the chemical, physical,

and metallurgical requirements of NACE MR0175/

ISO 15156 and/or NACE MR0103. Customers

have the responsibility to specify correct materials.

Environmental limitations may apply and shall be

determined by the user.

Capacity Information

Capacity tables are based on 0.97 specic gravity

nitrogen. Nitrogen is the most common blanketing

gas. Should you use a different gas, convert the

tabular values as follows. For blanketing (pad) gases

other than nitrogen, multiply the given nitrogen ow

rate by the correction factors in Table 7. For gases

of other specic gravities, multiply the given nitrogen

ow rate by 0.985, and divide by the square root of the

appropriate specic gravity.

Q =

520

Sin

3417

Deg

To determine wide-open ow capacities for relief

sizing, use the following formula:

where,

= gas sizing coefcient from Table 2

= C

, or 35 from Table 2

G = gas specic gravity (air = 1.0)

1abs

= inlet pressure, psia (add 14.7 psi to gauge inlet

pressure to obtain absolute inlet pressure)

Q = ow rate, SCFH

T = absolute temperature in °Rankine of gas at inlet

1 2 3 4 5 6 7 8 9 10 11 12 ... 15 16

Bulletin 74.1:Y690A 1

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