Benoil Services Ltd

6.10. Effect of Temperature on Burst Pressure

Discs are rated at nominal value 5% 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.

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