Auspex Gas Sizing Tables

Auspex Gas
Sizing Tables

The Auspex Gas pipe and fitting system is a revolutionary alternative for the professional plumber and gasfitter that makes any job quicker and easier.

Only available in Australia.

Pipe Sizing

The following example is for natural gas using:

Supply Pressure 2.75kPa
Pressure Drop 0.75kPa

Pipe Section	A→D	A→B	B→C	C→D	C→E	B→F*
Pipe Length	20	5	5	10	4	4
Gas Flow MJ/h	305	165 + 85 + 55 = 305	85 + 55 = 140	55	85	165
Fitting Correction	0.8 + 1.7 + 1.7 = 4m
Corrected Index Run	24m	24m	24m	24m	24m	24m
Nominal Pipe Size Corrected		32mm	25mm	16mm	20mm	25mm
Nominal Pipe Size Uncorrected		25mm	25mm	16mm	20mm	25mm

* In keeping with gasfitting best practice, if any value is close to the limit, upsize.

Natural Gas

Pressure Drop 0.075 (Meter Pressure 1.1kPa)

Length of main run in metres

Nominal Size	2	4	6	8	10	12	14	16	18	20	25	30	35	40	45	50	55	Correction (+ mt for fitting)
16mm	81	55	44	36	33	29	26	25	23	–	–	–	–	–	–	–	–	1.2
20mm	130	86	69	59	52	47	42	39	37	35	31	27	25	23	21	20	19	1.1
25mm	309	207	165	141	123	110	101	94	88	83	74	66	60	55	52	49	46	0.6
32mm	593	405	323	271	235	214	195	181	170	159	142	126	115	107	99	95	90	0.5

Nominal Size	60	65	70	75	80	85	90	95	100	120	140	160	180	200	250	300	Correction (+ mt for fitting)
16mm	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	1.2
20mm	18	–	–	–	–	–	–	–	–	–	–	–	–	–	–	–	1.1
25mm	44	42	40	38	37	36	35	34	33	–	–	–	–	–	–	–	0.6
32mm	85	81	77	75	72	69	67	65	63	61	53	48	45	43	38	34	0.5

Pressure Drop 0.75 (Meter Pressure 2.75kPa)

Length of main run in metres

Nominal Size	2	4	6	8	10	12	14	16	18	20	25	30	35	40	45	50	55	Correction (+ mt for fitting)
16mm	313	208	166	143	122	109	102	93	89	83	74	65	60	56	52	49	46	1.7
20mm	495	340	264	221	197	177	161	153	140	133	117	105	95	89	84	77	75	1.5
25mm	1176	789	622	532	467	421	386	358	334	313	281	248	224	215	197	186	175	0.8
32mm	2284	1547	1180	1048	893	828	737	685	657	610	537	479	440	408	384	360	337	0.7

Nominal Size	60	65	70	75	80	85	90	95	100	120	140	160	180	200	250	300	Correction (+ mt for fitting)
16mm	45	43	40	38	36	35	–	–	–	–	–	–	–	–	–	–	1.7
20mm	70	67	65	61	59	57	55	55	53	47	43	40	37	35	31	27	1.5
25mm	169	161	154	147	142	136	133	128	125	112	104	95	89	84	74	67	0.8
32mm	326	308	296	284	272	263	255	246	243	217	198	184	172	162	142	128	0.7

Pressure Drop 1.5 (Meter Pressure 2.75kPa)

Length of main run in metres

Nominal Size	2	4	6	8	10	12	14	16	18	20	25	30	35	40	45	50	55	Correction (+ mt for fitting)
16mm	431	290	230	195	172	155	142	131	123	116	102	92	84	78	73	69	65	1.7
20mm	844	568	451	382	337	303	278	257	241	227	199	180	165	152	143	134	127	1.5
25mm	1629	1096	870	738	649	585	536	496	464	437	385	347	317	294	275	259	245	0.8
32mm	3181	2141	1698	1440	1268	1143	1046	969	906	853	751	677	620	574	537	505	479	0.7

Nominal Size	60	65	70	75	80	85	90	95	100	120	140	160	180	200	250	300	Correction (+ mt for fitting)
16mm	62	59	57	54	52	51	49	48	46	42	38	35	33	31	27	25	1.7
20mm	121	116	111	106	103	99	96	93	90	81	75	69	65	61	53	48	1.5
25mm	233	223	214	205	198	191	185	179	174	157	144	133	125	117	103	93	0.8
32mm	456	435	417	401	386	373	361	350	340	307	281	260	243	229	202	182	0.7

Pressure Drop 1.5 (Meter Pressure 5 – 10kPa)

Length of main run in metres

Nominal Size	2	4	6	8	10	12	14	16	18	20	25	30	35	40	45	50	55	60	Correction (+ mt for fitting)
16mm	476	322	255	215	192	171	157	145	136	127	113	101	93	86	80	76	71	68	1.7
20mm	757	517	406	346	302	272	250	232	219	204	179	161	150	136	129	123	114	108	1.5
25mm	1801	1218	976	815	719	647	594	551	514	486	429	390	351	325	306	287	273	258	0.8
32mm	3485	2333	1852	1577	1391	1252	1149	1072	996	934	824	741	681	631	585	556	522	501	0.7

LPG

Pressure Drop 0.25kPa (Pressure Supply 2.75kPa) (MJ/h)

Length of main run in metres

Nominal Size	2	4	6	8	10	12	14	16	18	20	25	30	35	Correction (+ mt for fitting)
16mm	258	173	137	118	103	93	84	78	74	69	61	55	50	1.7
20mm	408	280	219	185	163	148	135	125	117	110	97	87	80	1.5
25mm	979	655	520	448	389	350	322	303	278	263	229	209	190	0.8
32mm	1882	1273	1005	855	747	673	617	573	539	505	445	402	365	0.7

Nominal Size	40	45	50	55	60	70	80	90	100	120	140	160	Correction (+ mt for fitting)
16mm	46	44	41	38	37	–	–	–	–	–	–	–	1.7
20mm	74	69	65	61	58	54	48	46	44	40	36	34	1.5
25mm	179	164	155	146	141	128	119	111	105	95	85	80	0.8
32mm	338	317	298	283	269	246	226	212	201	181	166	145	0.7

Pressure Drop 10kPa (Pressure Supply 70kPa) (MJ/h)

Length of main run in metres

Nominal Size	2	4	6	8	10	12	14	16	18	20	25	30	35	Correction (+ mt for fitting)
16mm	2255	1525	1211	1021	909	810	752	683	646	609	542	483	444	–
20mm	3617	2421	1932	1637	1444	1294	1182	1096	1037	966	848	764	700	–
25mm	8538	5774	4584	3923	3409	3099	2817	2626	2436	2305	2013	1830	1661	–
32mm	16495	11042	8766	7578	6586	5927	5443	5048	4705	4409	3889	3500	3246	–

Nominal Size	40	45	50	55	60	70	80	90	100	120	140	160	Correction (+ mt for fitting)
16mm	411	381	357	343	325	300	275	259	241	216	201	184	–
20mm	659	605	573	539	515	511	441	409	383	346	318	298	–
25mm	1541	1465	1359	1286	1223	1135	1042	981	919	828	752	698	–
32mm	3019	2801	2664	2465	2397	2197	1998	1872	1773	1596	1451	1345	–