API SPEC 11N : 1994

1 Scope
1.1 Coverage
1.2
1.3
1.4
1.5
1.6
1.7
1.8
2 References and abbreviations
3 Definitions
3.1
3.2
4 Shop assembly, testing, and warranty
4.1
4.2
4.3
5 Mechanical and hydraulic specifications
5.1 Skid mounting
5.2
5.3 Hydraulic assembly
5.4 Piping
5.5
5.6 Weather protection
6 Charging pump and motor
6.1 Pump
6.2
6.3
6.4
6.5
6.6
6.7
6.8
6.9
6.10
6.11 Motor
7 Strainer and/or (optional) air/gas eliminator
7.1
7.2
7.3
7.4
7.5
8 Sediment and water probe, monitor, and diverter
       valve
8.1
8.2
8.3 Diverter valve (optional)
8.4
8.5
9 Displacement meter or turbine meter
9.1
10 Thermowell and three-way prover loop
10.1 Thermowell
10.2
10.3 Prover loop
10.4
10.5
11 Back-pressure valve
11.1
11.2
11.3
11.4
12 Sampling
12.1 General considerations
12.2 Sample connection
12.3 Sample probe
12.4 Sample stream piping
12.5 Sampler
12.6 Sample container
13 Electrical
13.1
13.2
13.3
13.4
13.5
13.6 Safety features
13.7
13.8
13.9
13.10
13.11
13.12 Power enclosure
13.13
13.14
13.15 Alarm beacon
14 Recirculating pump
14.1
14.2
15 Sealing
16 Inspection and rejection
16.1 Inspection notice
16.2 Plant access
16.3 Compliance
17 Marking
17.1
17.2
Appendix A - Data sheets - API LACT unit specification
             data sheet
Appendix B - Metric conversions
Appendix C - Use of API monogram
C.1 Markings
C.2
C.3
Figure
1 Typical positive displacement or turbine meter
       LACT unit flow diagram

Describes assemblies unattended automatic custody transfer of liquid hydrocarbons below 11,000 U.S barrels a day at less than 500 psig.