Ashcroft TC Installation And Maintenance Instructions - Page 2

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Installation and Maintenance Instructions

for the TC Tank Level Gauge

5. INSTALLATION

Considerable care should be taken during installation to

prevent damage and ensure proper performance. It is

recommended that the case be mounted in position prior to

commencing installation; this will reduce the risk of damaging

the instrument's capillary line when it is uncoiled.

Note: If practicable, capillary line should only be disconnected

from the indicator case during installation.

CAUTION

Protect the capillary line's coupling in the event it needs to be

disconnected during routing and installation. Take care when

uncoiling the capillary line while not using the case or seal

housing as leverage points since this could damage the unit

and render it inoperable.

5.1 NOTES

1. Protect the seal housing against the ingress of foreign

matter such as sharp particles or this may puncture the

diaphragm.

2. Support externally routed capillary line with mounting cleats

at intervals of approximately 8 inches (200 mm).

3. Provide mounting cleats at the beginning and completion of

each bend of the capillary line.

4. Despite having a stainless steel case, it is recommended that

a shield be installed where damage may occur.

5. Capillary line should not be routed with a radius less than 2

inches (5 cm).

CAUTION - DISCONNECTING THE CAPILLARY

Disconnecting the capillary should be avoided unless it is

required for routing through a bulkhead or partition wall.

If necessary, the following steps should be followed:

1. Disconnect capillary line at the seal housing; use two

wrenches (17mm).

2. Mount the gauge at installation.

3. Route capillary line through the wall and fasten with cleats at

suggested intervals.

4. Mount the seal housing at tank installation (internal or

external).

5. Thread capillary line to seal housing; use two wrenches (17 mm).

6. Gently open valve between the tank and the seal housing.

CAUTION

Avoid any pressure at the seal housing when disconnecting the

capillary line; disregarding may lead to damage, or injury.

The instrument case may be installed in any orientation to the

seal housing without affecting the gauge reading.

CAUTION

The following should be confirmed prior to installation:

1. Dial references to required specific gravity.

All sales subject to standard terms and conditions of sale. Tank_Content_Gauge_im_RevA_(I&M008-10279)_07-23-20

2. Unit capillary line length.

3. Unit's original installation point had not changed in relation

to the bottom of the tank.

4. Operating temperature reflects original specification.

5.2 INSTALLING THE SEAL HOUSING (EXTERNAL)

The seal housing is bolted to a flange on the side of the tank

(vessel). Installation is measured from the centerline of the

connection point to the bottom of the tank; this requirement

must exactly match that of the initial specification.

Take precautions to ensure that the machined face of the seal

housing is not fouled by any welds or debris.

The diaphragm in the seal housing detects the hydrostatic head

of the tank contents through holes or mesh. There should be no

restrictions between the flange and tank, so proper flow of tank

contents is guaranteed.If not, holes should be drilled.

CAUTION

TO PREVENT DAMAGE TO THE DIAPHRAGM OR SEAL

HOUSING, MOUNTING HOLES MUST BE DRILLED BEFORE

FITTING THE SEAL HOUSING.

The seal housing may be fitted using an Ashcroft isolating

valve. This enables it to be removed without draining the

tank (vessel). Be sure that the tank is completely empty if

the capillary needs to be reconnected after installing the seal

housing.

5.2 INSTALLING THE SEAL HOUSING (INTERNAL)

The seal housing is mounted horizontally on an internal bracket

with the diaphragm facing downward at a predetermined

height from the bottom of the tank; this measurement must be

specified and not altered from that of the initial order.

The connecting capillary line is protected by flexible stainless

steel armored tubing routed inside of the tank to a bulkhead

flange/fitting on the side or top of the tank. Capillary line should

pass through the bulkhead flange or bulkhead fitting and be

adequately supported using best industry practices. Use a

correctly sized spanner to tighten connections.

CAUTION

NEVER TWIST THE INDICATOR OR SEAL HOUSING TO

TIGHTEN CONNECTIONS.

5.3 INSTALLING THE INDICATING CASE

The indicator must be mounted in compliance with standard

industry practice and is designed with an integral back flange

for wall (surface) mounting.

CAUTION

The gauge must not be subjected to:

• Mechanical shock

• Vibration

• Temperature in excess of the unit's recommended operating

temperature