Reciprocating Compressor / API 618 /Query

[Vino Varghese]

Dear Experts/Advisers in Compressor Manufacturing,

 

I would like to know what should be the design Code for the Lub Oil Tanks in Compressor?

 

The Supplier is referring to their own Manufacturing Standard stating that this is just a Atmospheric Tank and if Cient insists then there will be Cost and Schedule impact.

The Client is insisting to use any International Code and Supplier to provide Calculation for the same.

 

Query.

1. Does API 618 refers to Lub Oil Tank, if so, which Section of API 618?  Also advise the Code of Construction,Inspection and Testing.

2. If API 618 does not refers then which International Code should be referred?

 

Hope to see as usual response from every corner.

 

Thanks & Regards

VPV - Doha

 

 

[Darji Nilesh (Mumbai - Machinery)]

Kindly  mention KW Rating for your compressor.

 

As per API 618 :

 

Reciprocating compressor crank case it self can be used (in most of the cases as per Mfr. Standard) as a Lube Oil Reservoir and a separate tank is not required.

 

In your case why Separate LO Tank is used ?? Is it Client / ITB Requirements ?

 

As per API 618, The basic Lube Oil system shall be in compliance to para 6.14.2.4 see below

 

6.14.2.1.4 The basic oil system, in accordance with 6.14.2.1.2, shall contain, as a minimum, the following components:

a. reservoir—typically the compressor crankcase;

b. main oil pump—(materials in accordance with 6.14.2.1.5) which may be shaft-driven or motor driven;

c. auxiliary pump, when required, in accordance with 6.14.2.2;

d. single cooler (see 6.14.2.3);

e. dual filters (see 6.14.2.4);

f. heater—when required (see 6.14.2.5);

g. pressure relief valve for each pump (see 6.14.2.6);

h. single regulator for control of delivered oil pressure (separate from relief valves);

i. single regulator for oil temperature control (see 6.14.2.7);

j. valves—material shall be carbon steel with stainless steel trim;

k. oil piping—shall be stainless steel pipe and fittings (with the exception of cast-in-frame lines or passages); or stainless steel

tubing and fittings (see 6.14.2.1.8);

l. The following instruments:

— one pressure indicator;

— two temperature indicators;

— one level indicator (on the crankcase or reservoir) (see 6.14.2.1.9);

— one pressure transmitter for low pressure alarm and auxiliary pump start;

— one low frame oil level transmitter for alarm;

— one filter high differential pressure transmitter for alarm;

— one pressure transmitter for low pressure shutdown.

See Figure G-5 for a typical schematic drawing of a lube-oil system.

 

 

If Lube Oil system is required as per API 614 (Special purpose or general purpose) in that case a separate Lube Oil reservoir is required but, API 614 does not specify compliance to API 650 for Oil reservoir.

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