Groth 5000 User Manual
Page 3

Page 3 of 4
materials. Before installation, inspect the unit for indications of physical damage or internal
contamination. If these are observed, the vent must be disassembled, cleaned and repaired before
installation.
V. INSTALLATION
WARNING: The vent should be installed in a vertical position. Other orientations are allowed, but
care must be taken to avoid orienting the vent such that condensate collects in the vent body.
To achieve nominal flow capacity, the tank nozzle bore must be at least the same nominal
dimension as the relief vent inlet body.
This series of vents all have 150# ANSI flange drilling, unless otherwise specified. Torque
guidelines are listed in Table 1. The vents are NOT rated for full flange pressure and do not require
high bolting torque. Consult factory for special applications.
The following guidelines should be observed at installation:
1. Remove all packing material from the valve before installation.
2. Inspect the gasket seating surface of the tank nozzle flange. It must be clean, free of
scratches, corrosion, tool marks, and flat.
3. Aluminum vents are furnished as a standard with flat face flanges; they should only be
installed on a mating flat face flange with a full faced gasket.
4. Inspect the gasket; make sure that the material is suitable for the application.
5. Lubricate all studs and nuts with an appropriate thread lubricant. If the vent will see high
temperature service or stainless steel fasteners are used, apply an anti-seize compound
such as moly-disulfide.
6. Center the gasket within the bolt circle.
7. Set the vent carefully on the nozzle. Install the studs and tighten nuts hand tight. For studs
selection for blind tapped holes see Table 1.
8. Torque all fasteners to half the value listed in Table 1, in a staggered, alternating pattern.
9. Make sure that the flanges are not distorted and that the gasket is evenly compressed.
Make up the final torque and check that no further nut rotation occurs at the torque value
specified on Table 1.
Table 1 – Bolt Torque & Stud Specifications – ANSI #150
Flange Connections
Mounting
Flange
Bolt Torque – lb-ft(N-m)
Number
of Bolts
Studs
Raised Face
Flat Face
Thread
2”
30(41)
60(81)
4
5/8” – 11
3”
54(73)
108(146
4
5/8” – 11
4”
45(57)
78(106)
8
5/8” – 11
6”
90(122)
150(203)
8
3/4” – 10
8”
126(171)
228(309)
8
3/4” – 10
10”
138(187)
246(334)
12
7/8” – 9
12”
186(252)
348(472)
12
7/8” – 9
VI. MAINTENANCE
INSTRUCTIONS
The vent should be inspected annually for corrosion and hardware tightness.