Baldor GLC35, GLC80, GLC50, GLC125 manual Example Determining Pipe Size for LPG

Example: Determining Pipe Size for LPG

A generator has a 16Hp engine 60 feet from the supply. Determine the supply pipe size for Natural Gas fuel.

16 x 10,000 = 160,000 BTU’s / per hour for proper operation.

160, 000 + 63.5 cubic feet per hour. 2, 516

From Table 3-6, a 60 foot run requires a minimum 1” pipe at full engine load.

LP Gas Connections (vapor withdrawal only)

The LPG connections should only be made if your generator is setup to run on LPG. If it is setup to run on Natural Gas, contact your Baldor representative and do not continue with installation.

The incoming pressure must be 11 inches water column (6 oz. pressure).

Table 3-6 LP Gas Flow Rate (Cubic Feet per Hour) per Pipe Length

Pipe						Iron Pipe Size
Length
	1/2″	3/4″	1″	1–1/4″	1–1/2″		2″	2–1/2″	3″	4″	6″	8″
(Feet)
15	48	109	218	475	772		1570	2437	4115	8786	24497	50007
30	33	76	153	339	538		1127	1741	2975	6140	17325	35353
45	27	63	126	275	443		934	1456	2469	5001	14781	28865
60	24	54	110	241	386		817	1266	2184	4304	12236	25004
75		49	98	218	345		709	1108	1899	3798	10957	22345
90		44	89	196	310		633	987	1709	3482	10001	20414
105		41	83	180	285		582	905	1551	3228	9254	18895
120			76	171	266		544	848	1456	3038	8659	17673
150			69	153	241		494	772	1323	2754	7748	15825
180			63	142	222		456	709	1234	2532	7064	14432
210			58	130	202		418	652	1127	2342	6439	13356
240				120	190		393	614	1063	2209	6077	12405
270				113	180		367	576	1000	2057	5697	11780
300				108	171		345	544	943	1899	5381	11179

Note: Almost all operation problems are related to the installation techniques used.

Do Not guess, be sure pipe size is adequate for required flow rate.

1.Connect the proper size gas pipe at the input to the LP Gas regulator. Connect the LPG pipe line shown in Figure 3-3 using the correct size pipe for the required flow rate and length of pipe. Refer to Table 3-6 for pipe size. Be certain that all connections are sealed and no leaks are present. The installer must ensure that all gas connections comply with all building codes.

2.Verify Fuel Supply Pressure

Prior to initial operation of generator, verify that fuel system pressure is 11″ Water Column (6 oz. pressure) and fuel pipe sizes comply with Table 3-6.

3.Proceed to Electrical Connections.

3-8 Receiving & Installation MN2408