---
kind: "section"
citation: "46 C.F.R. § 154.1320"
title: "46"
number: "154.1320"
heading: "Sighting ports, tubular gauge glasses, and flat plate type gauge glasses."
url: "https://uscodex.org/cfr/46/154.1320"
---

# §154.1320. Sighting ports, tubular gauge glasses, and flat plate type gauge glasses.

- (a) Cargo tanks may have sighting ports as a secondary means of liquid level gauging in addition to the gauges under [§ 154.1305](/cfr/46/154.1305.md), if:
  - (1) The tank has a MARVS that is less than 69 kPa gauge (10 psig);
  - (2) The port has a protective cover and an internal scale; and
  - (3) **The port is above the liquid level.**
- (b) Tubular gauge glasses must not be liquid level gauges for cargo tanks.
- (c) Plate type gauge glasses must not be liquid level gauges for cargo tanks, except deck tanks if the gauge connections have excess flow valves.

## Notes

### Authority

Authority: 46 U.S.C. 3703, 9101; Department of Homeland Security Delegation No. 0170.1.

### Source

Source: CGD 74-289, 44 FR 26009, May 3, 1979, unless otherwise noted.