Effect of Temperature on Burst Pressure

6.10. Effect of Temperature on Burst Pressure

Discs are rated at nominal value ą5% at 20C, and each production batch is tested and certified to be within the limits. However, discs are used downhole at higher temperatures than 20C, and the following temperature coefficients have been used to calculate the burst pressure range at various temperatures.

These values apply to nickel discs as currently used, and to no others unless expressly stated. The product label will indicate any future variation if applicable.


TC	Coeff	1000psi	2000psi	3000psi	4000psi	5000psi

20	1.00	950-1050	1900-2100	2850-3150	3800-4200	4750-5250

30	0.99	936-1034	1872-2069	2807-3103	3743-4137	4679-5171

40	0.97	922-1019	1843-2037	2765-3056	3686-4074	4608-5145

50	0.96	912-1008	1824-2016	2736-3024	3648-4032	4560-5040

60	0.95	903-998	1805-1995	2708-2993	3610-3990	4513-4988

70	0.94	893-987	1786-1974	2679-2961	3572-3948	4465-4935

80	0.93	884-977	1767-1953	2651-2930	3534-3906	4418-4883

90	0.92	874-966	1748-1932	2622-2898	3496-3864	4370-4830

100	0.91	865-956	1729-1911	2594-2867	3458-3822	4323-4778

110	0.90	855-945	1710-1890	2565-2835	3420-3780	4275-4725

120	0.89	846-935	1691-1869	2537-2804	3382-3738	4228-4673

130	0.88	836-924	1672-1848	2508-2772	3344-3696	4180-4620

140	0.88	831-919	1663-1838	2494-2756	3325-3675	4156-4594

150	0.87	827-914	1653-1827	2480-2741	3306-3654	4132-4568

160	0.87*	822-908	1653-1827	2480-2741	3306-3654	4132-4568

170	0.86	817-903	1634-1806	2451-2709	3268-3612	4085-4515

180	0.85	808-893	1615-1785	2423-2678	3230-3570	4038-4463

190	0.85	803-887	1606-1775	2408-2662	3211-3549	4014-4436

200	0.84	798-882	1596-1764	2349-2646	3024-3528	3990-4410

* The former polymer withstands 120C; a first improved form stands up to 140C; further improvements have been tested able to withstand 160C. This is now the standard used in cement darts. In consequence, we no longer list either the 120C or 140C forms.