Marsh Hawk TRV Installation, Operation and Maintenance Guide - May 2022
1
N OT E : I N F O R M AT I O N R E Q U I R E D F O R S U CC E S S F U L
I N S TA L L AT I O N
C AU T I O N : I N F O R M AT I O N I F N OT F O L LOW E D M AY
R E S U LT I N DA M AG E O R I N S TA L L AT I O N FA I L U R E
WA R N I N G : I N F O R M AT I O N I F N OT F O L LOW E D M AY
R E S U LT I N I N J U RY O R D E AT H
C O N T E N TS
PART A: INSTALLATION
A1
Marsh Hawk TRV Installation
A2
Marsh Hawk TRV Installation using bolt ring
A3
De-Icing System Installation
PART B: OPERATION
B1
Spider Cage (Internals) Removal
B2
Pressure Spacer Adjustment
PART C: MAINTENANCE
C1
Replacing Pressure / Vacuum Gasket
C2
Inspection & Re-lubrication
C3 Troubleshooting
C4
Antifreeze Solutions
PA RT A :
I N S TA L L I N G M A R S H H AW K T RV
N OT E : T H E M A R S H H AW K T RV R E Q U I R E S A N 8” A P I
12 F F L A N G E C O N N E C T I O N . I F M O U N T I N G D I R E C T -
LY O N A TA N K R O O F W I T H O U T S P O O L , N OZ Z L E
O R R I S E R , T H E D E E P - S E T N AT U R E O F H ATC H M AY
P R E C L U D E I N S TA L L I N G FA S T E N E R S O N T H E I N T E R I -
O R O F T H E TA N K . I N T H I S C A S E , A M A R S H H AW K
T RV B O LT R I N G , PA RT #
H R - F - 8 P - ST U D S - AS M
W I L L B E
R E Q U I R E D -- S E E S E C T I O N A 2 F O R I N S TA L L AT I O N
N OT E S . A DA P T E R S P O O L S TO M O U N T TO OT H E R A P I
A N D A N S I C O N N E C T I O N S A R E AVA I L A B L E . S E E O U R
W E B S I T E F O R M O R E I N F O R M AT I O N O N S P O O L S A N D
R I S E R S .
A1 MARSH HAWK TRV INSTALLATION
TOOLS
»
3/4 Box or Socket Wrench (torque wrench
recommended)
PARTS REQUIRED
»
1
Marsh Hawk TRV
»
1
8” API Tank Gasket
»
16 1/2 UNC x 1-3/4 Bolts & Nuts
1.
Place Tank Gasket on the 8” API Tank Flange and align
holes.
SCH 40
OR LIGHTER
NOZZLE
7.98” min
I N STA L L AT I O N , O P E R AT I O N A N D M A I N T E N A N C E G U I D E
S E R I E S 4 000 M A R S H H AW K
This document contains the recommended procedures for installing, operating and maintaining a Series 4000 Marsh Hawk Tank Relief Vent. Read and understand this document prior to
installing, operating or maintaining the Series 4000 Marsh Hawk TRV. Replaces May 2010 Installation and Maintenance Guide. Suitable for use with all Marsh Hawk TRVs manufactured
since August 2011.
2.
Mount Marsh Hawk on base gasket and align holes.
3.
Fasten with the supplied 1/2 UNC Bolts and Nuts
with the 3/4 Box or Socket Wrench. Use washers on
the Marsh Hawk side of the bolted connection. Install
hand-tight, then torque to
14 ft-lbs
. Installation torques
over the recommended value may reduce long-term
sealing performance. Follow bolting pattern below.
5
6
7
8
1
9
10
11
12
13
14
15
16
2
3
4
8 API 12B
A2 INSTALLATION WITH BOLT RING
TOOLS
»
3/4 Box or Socket Wrench (torque wrench
recommended)
PARTS REQUIRED
»
1
Marsh Hawk TRV
»
2
8” API Tank Gasket
»
1
Bolt Ring, c./w studs & nuts
1.
Align and place bolt ring on the 8” API Tank Opening,
ensuring gaskets are in place on both sides of the bolt
ring.
2.
Install underside nuts ensuring a minimum 1/4” of
thread is exposed on the stud when nuts are secured.
Install hand tight, then torque to
14 ft-lbs
. Follow
bolting pattern in A1, step 3.
.25 MIN
.25 MIN
3.
Align studs with holes in Marsh Hawk TRV mounting
flange and drop into place.
4.
Install remaining nuts. Install hand-tight, then torque to
14 ft-lbs
. Installation torques over the recommended
value may reduce long-term sealing performance
Follow bolting pattern in A1 step 3.
